May 1995 Form: TM-315

Effective With Serial No. HF826825

TECHNICAL MANUAL
Service And Parts

Dialarc HF And HF-P

For SMAW And GTAW Welding

WARNING Use MILLER Testing Booklet (Part No.

150 853) when servicing this unit.
SERVICING can be hazardous. Use only genuine MILLER replacement
• Have all service procedures performed only by parts.
qualified persons following standard safety
practices.

For help, call Factory Or FAX inside the USA: Or write to:
Service Department: 800-637-2348 MILLER Electric Mfg. Co.
414-735-4505 Outside the USA: P.O. Box 1079
414-735-4136 Appleton, WI 54912 USA
cover_tm 5/95 – Ref. ST-070 399-D  1995 MILLER Electric Mfg. Co. PRINTED IN USA
 ARC WELDING SAFETY PRECAUTIONS
WARNING ARC WELDING can be hazardous.
PROTECT YOURSELF AND OTHERS FROM POSSIBLE SERIOUS INJURY OR DEATH. KEEP CHILDREN
AWAY. PACEMAKER WEARERS KEEP AWAY UNTIL CONSULTING YOUR DOCTOR.
In welding, as in most jobs, exposure to certain hazards occurs. Welding is safe when precautions are taken. The
safety information given below is only a summary of the more complete safety information that will be found in the
Safety Standards listed on the next page. Read and follow all Safety Standards.
HAVE ALL INSTALLATION, OPERATION, MAINTENANCE, AND REPAIR WORK PERFORMED ONLY BY
QUALIFIED PEOPLE.

ELECTRIC SHOCK can kill. terminal in disconnect box or that cord plug is connected to a
properly grounded receptacle outlet.
Touching live electrical parts can cause fatal shocks
or severe burns. The electrode and work circuit is 7. When making input connections, attach proper grounding
electrically live whenever the output is on. The input conductor first – double-check connections.
power circuit and machine internal circuits are also 8. Frequently inspect input power cord for damage or bare wiring –
live when power is on. In semiautomatic or automatic
wire welding, the wire, wire reel, drive roll housing, replace cord immediately if damaged – bare wiring can kill.
and all metal parts touching the welding wire are 9. Turn off all equipment when not in use.
electrically live. Incorrectly installed or improperly
grounded equipment is a hazard. 10. Do not use worn, damaged, undersized, or poorly spliced
cables.
1. Do not touch live electrical parts. 11. Do not drape cables over your body.
2. Wear dry, hole-free insulating gloves and body protection. 12. If earth grounding of the workpiece is required, ground it directly
3. Insulate yourself from work and ground using dry insulating with a separate cable – do not use work clamp or work cable.
mats or covers big enough to prevent any physical contact with
13. Do not touch electrode if you are in contact with the work,
the work or ground.
ground, or another electrode from a different machine.
4. Disconnect input power or stop engine before installing or
14. Use only well-maintained equipment. Repair or replace
servicing this equipment. Lockout/tagout input power according
damaged parts at once. Maintain unit according to manual.
to OSHA 29 CFR 1910.147 (see Safety Standards).
5. Properly install and ground this equipment according to its 15. Wear a safety harness if working above floor level.
Owner’s Manual and national, state, and local codes. 16. Keep all panels and covers securely in place.
6. Always verify the supply ground – check and be sure that input 17. Clamp work cable with good metal-to-metal contact to
power cord ground wire is properly connected to ground workpiece or worktable as near the weld as practical.

ARC RAYS can burn eyes and skin; ARC RAYS

NOISE can damage hearing; FLYING
SLAG OR SPARKS can injure eyes. 2. Wear a welding helmet fitted with a proper shade of filter to
protect your face and eyes when welding or watching (see ANSI
Arc rays from the welding process produce intense Z49.1 and Z87.1 listed in Safety Standards).
visible and invisible (ultraviolet and infrared) rays that
can burn eyes and skin. Noise from some processes 3. Wear approved safety glasses with side shields.
can damage hearing. Chipping, grinding, and welds 4. Use protective screens or barriers to protect others from flash
cooling throw off pieces of metal or slag. and glare; warn others not to watch the arc.
NOISE 5. Wear protective clothing made from durable, flame-resistant
1. Use approved ear plugs or ear muffs if noise level is high. material (wool and leather) and foot protection.

FUMES AND GASES can be hazardous 5. Work in a confined space only if it is well ventilated, or while
to your health. wearing an air-supplied respirator. Always have a trained
Welding produces fumes and gases. Breathing watchperson nearby. Welding fumes and gases can displace
these fumes and gases can be hazardous to your air and lower the oxygen level causing injury or death. Be sure
health. the breathing air is safe.
6. Do not weld in locations near degreasing, cleaning, or spraying
1. Keep your head out of the fumes. Do not breathe the fumes. operations. The heat and rays of the arc can react with vapors to
2. If inside, ventilate the area and/or use exhaust at the arc to form highly toxic and irritating gases.
remove welding fumes and gases. 7. Do not weld on coated metals, such as galvanized, lead, or
3. If ventilation is poor, use an approved air-supplied respirator. cadmium plated steel, unless the coating is removed from the
4. Read the Material Safety Data Sheets (MSDSs) and the weld area, the area is well ventilated, and if necessary, while
manufacturer’s instruction for metals, consumables, coatings, wearing an air-supplied respirator. The coatings and any metals
cleaners, and degreasers. containing these elements can give off toxic fumes if welded.

CYLINDERS can explode if damaged. 4. Never drape a welding torch over a gas cylinder.
Shielding gas cylinders contain gas under high 5. Never allow a welding electrode to touch any cylinder.
pressure. If damaged, a cylinder can explode. Since 6. Never weld on a pressurized cylinder – explosion will result.
gas cylinders are normally part of the welding
process, be sure to treat them carefully. 7. Use only correct shielding gas cylinders, regulators, hoses, and
fittings designed for the specific application; maintain them and
associated parts in good condition.
1. Protect compressed gas cylinders from excessive heat, 8. Turn face away from valve outlet when opening cylinder valve.
mechanical shocks, slag, open flames, sparks, and arcs. 9. Keep protective cap in place over valve except when cylinder is
2. Install cylinders in an upright position by securing to a stationary in use or connected for use.
support or cylinder rack to prevent falling or tipping. 10. Read and follow instructions on compressed gas cylinders,
3. Keep cylinders away from any welding or other electrical associated equipment, and CGA publication P-1 listed in Safety
circuits. Standards.
sr1.1.1 2/94
 WELDING can cause fire or explosion. 6. Be aware that welding on a ceiling, floor, bulkhead, or partition
can cause fire on the hidden side.
Welding on closed containers, such as tanks, drums,
or pipes, can cause them to blow up. Sparks can fly 7. Do not weld on closed containers such as tanks, drums, or
off from the welding arc. The flying sparks, hot pipes, unless they are properly prepared according to AWS
workpiece, and hot equipment can cause fires and F4.1 (see Safety Standards).
burns. Accidental contact of electrode to metal 8. Connect work cable to the work as close to the welding area as
objects can cause sparks, explosion, overheating, or
fire. Check and be sure the area is safe before doing practical to prevent welding current from traveling long,
any welding. possibly unknown paths and causing electric shock and fire
hazards.
1. Protect yourself and others from flying sparks and hot metal. 9. Do not use welder to thaw frozen pipes.
2. Do not weld where flying sparks can strike flammable material. 10. Remove stick electrode from holder or cut off welding wire at
3. Remove all flammables within 35 ft (10.7 m) of the welding arc. contact tip when not in use.
If this is not possible, tightly cover them with approved covers. 11. Wear oil-free protective garments such as leather gloves,
4. Be alert that welding sparks and hot materials from welding can heavy shirt, cuffless trousers, high shoes, and a cap.
easily go through small cracks and openings to adjacent areas. 12. Remove any combustibles, such as a butane lighter or
5. Watch for fire, and keep a fire extinguisher nearby. matches, from your person before doing any welding.

WARNING ENGINES can be hazardous.

ENGINE EXHAUST GASES can kill. 1. Use equipment outside in open, well-ventilated areas.
Engines produce harmful exhaust gases. 2. If used in a closed area, vent engine exhaust outside and
away from any building air intakes.

ENGINE FUEL can cause fire or 3. Do not overfill tank – allow room for fuel to expand.
explosion. 4. Do not spill fuel. If fuel is spilled, clean up before starting
Engine fuel is highly flammable. engine.

1. Stop engine and let it cool off before checking or adding fuel.
2. Do not add fuel while smoking or if unit is near any sparks or
open flames.

MOVING PARTS can cause injury. 3. Have only qualified people remove guards or covers for
maintenance and troubleshooting as necessary.
Moving parts, such as fans, rotors, and belts can 4. To prevent accidental starting during servicing, disconnect
cut fingers and hands and catch loose clothing.
negative (–) battery cable from battery.
5. Keep hands, hair, loose clothing, and tools away from moving
1. Keep all doors, panels, covers, and guards closed and parts.
securely in place. 6. Reinstall panels or guards and close doors when servicing is
2. Stop engine before installing or connecting unit. finished and before starting engine.

SPARKS can cause BATTERY GASES 1. Always wear a face shield when working on a battery.
TO EXPLODE; BATTERY ACID can 2. Stop engine before disconnecting or connecting battery
burn eyes and skin. cables.
3. Do not allow tools to cause sparks when working on a battery.
Batteries contain acid and generate explosive 4. Do not use welder to charge batteries or jump start vehicles.
gases. 5. Observe correct polarity (+ and –) on batteries.

STEAM AND PRESSURIZED HOT 1. If the engine is warm and checking is needed, follow steps 2
COOLANT can burn face, eyes, and and 3.
skin. 2. Wear safety glasses and gloves and put a rag over cap.
It is best to check coolant level when engine is cold 3. Turn cap slightly and let pressure escape slowly before
to avoid scalding. completely removing cap.

PRINCIPAL SAFETY STANDARDS

Safety in Welding and Cutting, ANSI Standard Z49.1, from American Safe Handling of Compressed Gases in Cylinders, CGA Pamphlet
Welding Society, 550 N.W. LeJeune Rd, Miami FL 33126 P-1, from Compressed Gas Association, 1235 Jefferson Davis High-
way, Suite 501, Arlington, VA 22202.
Safety and Health Standards, OSHA 29 CFR 1910, from Superinten-
dent of Documents, U.S. Government Printing Office, Washington, Code for Safety in Welding and Cutting, CSA Standard W117.2, from
D.C. 20402. Canadian Standards Association, Standards Sales, 178 Rexdale Bou-
levard, Rexdale, Ontario, Canada M9W 1R3.
Recommended Safe Practices for the Preparation for Welding and
Cutting of Containers That Have Held Hazardous Substances, Ameri- Safe Practices For Occupation And Educational Eye And Face Protec-
can Welding Society Standard AWS F4.1, from American Welding So- tion, ANSI Standard Z87.1, from American National Standards Insti-
ciety, 550 N.W. LeJeune Rd, Miami, FL 33126 tute, 1430 Broadway, New York, NY 10018.
National Electrical Code, NFPA Standard 70, from National Fire Cutting And Welding Processes, NFPA Standard 51B, from National
Protection Association, Batterymarch Park, Quincy, MA 02269. Fire Protection Association, Batterymarch Park, Quincy, MA 02269.
sr1.1.1 2/94
 EMF INFORMATION
Considerations About Welding And The Effects Of Low Frequency Electric And
NOTE Magnetic Fields
The following is a quotation from the General Conclusions Section To reduce magnetic fields in the workplace, use the following
of the U.S. Congress, Office of Technology Assessment, Biological procedures:
Effects of Power Frequency Electric & Magnetic Fields – 1. Keep cables close together by twisting or taping them.
Background Paper, OTA-BP-E-53 (Washington, DC: U.S.
Government Printing Office, May 1989): “. . . there is now a very 2. Arrange cables to one side and away from the operator.
large volume of scientific findings based on experiments at the 3. Do not coil or drape cables around the body.
cellular level and from studies with animals and people which clearly
4. Keep welding power source and cables as far away as
establish that low frequency magnetic fields can interact with, and practical.
produce changes in, biological systems. While most of this work is
of very high quality, the results are complex. Current scientific 5. Connect work clamp to workpiece as close to the weld as
understanding does not yet allow us to interpret the evidence in a possible.
single coherent framework. Even more frustrating, it does not yet About Pacemakers:
allow us to draw definite conclusions about questions of possible The above procedures are among those also normally
risk or to offer clear science-based advice on strategies to minimize recommended for pacemaker wearers. Consult your doctor for
or avoid potential risks.” complete information. mod10.1 4/93

TABLE OF CONTENTS
SECTION 1 – SAFETY INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

SECTION 2 – SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
2-1. Volt-Ampere Curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
2-2. Duty Cycle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

SECTION 3 – INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
3-1. Typical Process Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
3-2. Selecting A Location And Moving Welding Power Source . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
3-3. Selecting And Preparing Weld Output Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3-4. Lower Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3-5. Shielding Gas Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3-6. Water Connections (Optional) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3-7. Connecting To Weld Output Terminals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3-8. Remote Control Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3-9. 115 Volts AC Duplex Receptacle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3-10. Connecting Input Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

SECTION 4 – OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

SECTION 5 – THEORY OF OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

SECTION 6 – TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
6-1. Troubleshooting Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
6-2. Troubleshooting Circuit Diagram For Welding Power Source . . . . . . . . . . . . . . . . . . . . . . . . . 22
6-3. Waveforms For Section 6-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
6-4. Input Voltage Labels And Connection Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

SECTION 7 – MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
7-1. Routine Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
7-2. Overload Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
7-3. Adjusting Spark Gaps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

SECTION 8 – HIGH FREQUENCY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

SECTION 9 – ELECTRICAL DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

SECTION 10 – PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

OM-315U–8/93 / SPM-315H–4/94
 SECTION 1 – SAFETY INFORMATION
mod1.1 2/93

Read all safety messages throughout this manual.

Obey all safety messages to avoid injury.
Learn the meaning of WARNING and CAUTION.

1 Safety Alert Symbol

2 Signal Word
1 2 2
WARNING means possible death
or serious injury can happen.
WARNING 3 CAUTION CAUTION means possible minor
ELECTRIC SHOCK can kill. MOVING PARTS can injure. injury or equipment damage can
• Do not touch live electrical parts. • Keep away from moving parts. happen.
• Disconnect input power before 4 • Keep all panels and covers closed 3 Statement Of Hazard And
installing or servicing. when operating.
Result
4 Safety Instructions To Avoid
5 Hazard
5 Hazard Symbol (If Available)
6 Safety Banner
WARNING READ SAFETY BLOCKS at start of
Section 3-1 before proceeding. Read safety blocks for each sym-
6 bol shown.
7 NOTE
7 NOTE Turn Off switch when using high frequency. Special instructions for best op-
eration – not related to safety.

Figure 1-1. Safety Information

SECTION 2 – SPECIFICATIONS
Table 2-1. Welding Power Source

Specification Description

Type Of Output Constant Current (CC), Alternating Current/Direct Current (AC/DC)

Type Of Input Power Single-Phase; 200, 230, 460, Or 575 Volts AC; 60 Hz

Input Amperes At Rated Output HF Model: 103 A At 200 V, 90 A At 230 V, 45 A At 460 V, 36 A At 575 V
HF-P Model: 87 A At 200 V, 76 A At 230 V, 38 A At 460 V, 30 A At 575 V

Input Amperes While Idling HF Model: 6.9 A At 200 V, 6 A At 230 V, 3 A At 460 V, 2.4 A At 575 V
HF-P Model: 25 A At 200 V, 21.5 A At 230 V, 11 A At 460 V, 8.6 A At 575 V

KVA/KW Used At Rated Output HF Model: 20.7/12.4

HF-P Model: 17.5/12.4

KVA/KW Used While Idling HF Model: 1.4/0.75

HF-P Model: 5.0/0.75

Max. Open-Circuit Voltage AC Mode: 75 Volts

DC Mode: 76 Volts

Welding Processes Shielded Metal Arc (SMAW), Gas Tungsten Arc Welding (GTAW)

Overall Dimensions See Figure 3-3

Weight HF Model, Net: 476 lb (215 kg); Ship: 486 lb (220 kg)
HF-P Model, Net: 486 lb (220 kg); Ship: 496 lb (224 kg)

Shielded Metal Arc Welding (SMAW) Gas Tungsten Arc Welding (GTAW)

Rated Weld Output 250 Amperes, 30 Volts At 40% Duty Cycle; 200 200 Amperes AC At 40% Duty Cycle; 125 Am-
Amperes, 28 Volts At 60% Duty Cycle (See Sec- peres AC At 100% Duty Cycle; 250 Amperes
tion 2-2) DC At 40% Duty Cycle (See Section 2-2)

Dialarc HF, HF-P TM-315 Page 1

2-1. Volt-Ampere Curves

The volt-ampere curves show the

minimum and maximum voltage
and amperage output capabilities
of the welding power source.
Curves of other settings fall be-
tween the curves shown.

A. DC Mode B. AC Mode

ssb1.1 10/91 – ST-002 970-C / ST-002 974-C

Figure 2-1. Volt-Ampere Curves

2-2. Duty Cycle

CAUTION
EXCEEDING DUTY CYCLE RATINGS will damage unit.
• Do not exceed indicated duty cycles. warn7.1 2/92

Duty cycle is how long the unit can

operate within a ten minute period
without causing overheating or
damage.
This unit has several duty cycle rat-
ings, each for a specific amperage
output range (see Table 2-1). If op-
erated at 40% duty cycle for one
application, the unit can be used
for welding 4 minutes out of every
10 minutes. If the welding amperes
decrease, the duty cycle in-
creases.

sb1.4* 2/92 – Ref. ST-002 976-A

Figure 2-2. Duty Cycle Chart

TM-315 Page 2 Dialarc HF, HF-P
 SECTION 3 – INSTALLATION

WARNING
HIGH-FREQUENCY RADIATION can interfere with radio navigation, safety services, computers,
and communications equipment.
• Have only qualified person familiar with electronic equipment perform this installation.
• Read and follow entire Section 8 for proper location and installation requirements for high-frequency equipment before
installing unit. swarn13.1 4/93

3-1. Typical Process Connections

SMAW GTAW
Welding Welding
Power Source Power Source
With HF Off Work With HF On Work

Figure 3-1. Typical Process Connections

3-2. Selecting A Location And Moving Welding Power Source

WARNING
ELECTRIC SHOCK can kill. FUMES can be hazardous; LACK OF
• Do not touch live electrical parts. FRESH AIR AND PROPER VENTILA-
• Disconnect input power conductors from deener-
TION can be harmful.
gized supply line BEFORE moving welding power • Do not breathe welding fumes.
source. • Place unit only where there is a good fresh air sup-
ply and proper ventilation.
FIRE OR EXPLOSION can result from
placing unit on, over, or near combus-
tible surfaces.
• Do not locate unit on, over, or near combustible sur-
faces. FALLING EQUIPMENT can cause seri-
• Do not install unit near flammables. ous personal injury and equipment
BLOCKED AIRFLOW causes overheat- damage.
ing and possible damage to unit. • Use lifting eye to lift unit only, NOT running gear,
• Do not block or filter airflow.
•
gas cylinders, or any other accessories.
Use equipment of adequate capacity to lift the unit.
Warranty is void if any type of filter is used. swarn11.1 3/93

1 18 in (460 mm) Open Space

2 At Front And Rear For Good
1 Airflow
Rear 2 Lifting Eye
Use lifting eye to move unit.
3 Lifting Forks
If using lifting forks, extend forks
Front out opposite end of unit.
4 Rating Label
4 3 Locate unit near correct input pow-
er supply.

ST-158 495-A

Figure 3-2. Location and Movement Of Welding Power Source

Dialarc HF, HF-P TM-315 Page 3
 NOTE Overall dimensions (A, B, and C) include lifting eye, handles, hardware, etc.

Inches Millimeters
A 26-1/2 673

B 19-1/2 495
A
C 33-1/2 851
C D 33 838
B
E 32-1/4 819

F 31-1/2 800
D
E G 1-1/2 38
F H 3/4 19
G
J 19 483
H
K 17-7/8 454

L 1-1/8 29

M 1/2 Dia. 13 Dia.

6 Holes 6 Holes
Front
K J

M L
ST-158 493-A

Figure 3-3. Overall Dimensions And Base Mounting Hole Layout

3-3. Selecting And Preparing Weld Output Cables

1 Weld Output Cable
Determine total cable length in
3 4 weld circuit and maximum welding
amperes. Use Table 3-1 to select
proper cable size.
OR
Use shortest cables possible.
Do not use damaged cables.
2 Terminal Lug
Use lugs of proper amperage ca-
2 pacity and hole size for connecting
2 1 to work clamp, wire feeder or elec-
trode holder, and weld output ter-
minals.
3 Insulated Electrode Holder
10 ft (3 m)
4 GTAW Torch
Tools Needed: 5 For Example, Install according to manufacturer’s
Total Cable instructions.
Length In Weld
Circuit = 20 ft (6 m) 5 Work Clamp
10 ft (3 m) Install onto work cable.
sb6.5* 11/92 – S-0752

Figure 3-4. Selecting And Preparing Weld Output Cables

TM-315 Page 4 Dialarc HF, HF-P
 Table 3-1. Weld Cable Size*

Total Cable (Copper) Length In Weld Circuit Not Exceeding

150 ft 200 ft 250 ft 300 ft 350 ft 400 ft

100 ft (30 m) Or Less
(45 m) (60 m) (70 m) (90 m) (105 m) (120 m)

Welding 10 To 60% 60 Thru 100%

10 Thru 100% Duty Cycle
Amperes Duty Cycle Duty Cycle

100 4 4 4 3 2 1 1/0 1/0

150 3 3 2 1 1/0 2/0 3/0 3/0

200 3 2 1 1/0 2/0 3/0 4/0 4/0

250 2 1 1/0 2/0 3/0 4/0 2-2/0 2-2/0

300 1 1/0 2/0 3/0 4/0 2-2/0 2-3/0 2-3/0

350 1/0 2/0 3/0 4/0 2-2/0 2-3/0 2-3/0 2-4/0

400 1/0 2/0 3/0 4/0 2-2/0 2-3/0 2-4/0 2-4/0

500 2/0 3/0 4/0 2-2/0 2-3/0 2-4/0 3-3/0 3-3/0

*Weld cable size (AWG) is based on either a 4 volts or less drop or a current density of not more than 300 circular mils per ampere. S-0007-C

3-4. Lower Front Panel

1 2 1 Access Door
Loosen screw and open access
door.
2 Connections Label
3 Remote Amperage Control
Receptacle
4 Remote Contactor Control
Receptacle
12 3
5 Water In Connection (Option-
al)
6 Water Out Connection
(Optional)
11 4
7 Electrode Weld Output Termi-
nal
5 8 Work Weld Output Terminal
10 9 Gas Out Connection
10 Gas In Connection
6 11 115 Volts AC Duplex Recep-
9 tacle
12 High Frequency Spark Gaps
(Section 7-3)
Route all cables and Close access door after making
hoses under bar. connections.
8 7

Tools Needed:

ST-158 494

Figure 3-5. Lower Front Panel

Dialarc HF, HF-P TM-315 Page 5
3-5. Shielding Gas Connections

WARNING
CYLINDERS can explode if damaged. BUILDUP OF SHIELDING GAS can harm
• Keep cylinders away from welding and other health or kill.
electrical circuits. • Shut off shielding gas supply when not in use.
• Never touch cylinder with welding electrode.
• Always secure cylinder to running gear, wall, or
other stationary support. warn4.1 9/91

Obtain gas cylinder and chain to

running gear, wall, or other station-
ary support so cylinder cannot fall
and break off valve.
REMOTE
OUTPUT 1 Cap
(CONTACTOR) 2 Cylinder Valve
Remove cap, stand to side of
valve, and open valve slightly. Gas
flow blows dust and dirt from valve.
Close valve.
3 Cylinder
4 Regulator/Flowmeter
Install so face is vertical.
To Use Connect 5 Gas Hose Connection
Gas Valve Remote Device
Fitting has 5/8-18 right-hand
threads.
6 Flow Adjust
Typical flow rate is 15 cfh (cubic
feet per hour).
7 Gas In Fitting
8 Gas Out Fitting
1 The Gas In and Gas Out fittings
have 5/8-18 right-hand threads.
Obtain proper size, type, and
length hose and make connections
as follows:
2 Connect hose from shielding gas
6 supply regulator/flowmeter to Gas
In fitting.
Connect shielding gas hose from
GAS IN torch to Gas Out fitting.
5 Close access door.
3
7

Argon Gas

GAS OUT

To Torch Tools Needed:

5/8, 1-1/8 in

ssb3.3* 6/93 – ST-158 697-A / Ref. ST-071 975-F / Ref. S-071 983-D

Figure 3-6. Shielding Gas Connections

TM-315 Page 6 Dialarc HF, HF-P
3-6. Water Connections (Optional)

CAUTION
OVERHEATING can damage torch parts.
• If using recirculating coolant system, do not make connections from coolant system to water connections on welding power source; instead,
make connections directly from coolant system to torch hoses.

Turn Off welding power source.

1 Water In Fitting
REMOTE 2 Water Out Fitting
OUTPUT The Water In and Water Out fittings
(CONTACTOR) WATER IN
have 5/8-18 left-hand threads. Ob-
tain proper size, type, and length
hose and make connections.
1 Attach hose from water supply to
Water In fitting. Attach water hose
from torch to Water Out fitting.
Connect and route torch output
hose to proper drain.
WATER OUT Close access door.
To Use Connect
Coolant Valve Remote Device

Tools Needed:
5/8 in
Ref. ST-071 975-F

Figure 3-7. Water Connections

3-7. Connecting To Weld Output Terminals

WARNING
ELECTRIC SHOCK can kill.
• Do not touch live electrical parts.
• Turn Off welding power source, and disconnect input power before making any weld output connections.

swarn12.1 2/93

1 Work Weld Output Terminal

For both GTAW and SMAW weld-
ing, connect one end of work cable
to Work weld output terminal and
ELECTRODE remaining end to workpiece.
WORK 2 Electrode Weld Output Termi-
nal
1 2 For GTAW welding, connect torch
connector or cable to Electrode
weld output terminal. Be sure torch
connector does not touch access
door when closed.
For SMAW welding, connect elec-
trode holder cable to Electrode
weld output terminal.
Weld output polarity is determined
Tools Needed: by position of the AC/DC Selector
switch (see Figure 4-4).
3/4 in
Close access door.

Figure 3-8. Weld Output Connections

Dialarc HF, HF-P TM-315 Page 7
3-8. Remote Control Connections

1 Remote Amperage Control

REMOTE Receptacle
REMOTE OUTPUT 2 Remote Contactor Control
AMPERAGE (CONTACTOR) Receptacle
To connect to receptacle, insert
A plug and turn clockwise.
To assemble supplied remote con-
1 2 tactor control slide switch and plug,
proceed as follows:
3 Switch Clamp
Mount switch in desired location on
torch body. Secure switch with
clamp.
4 Twistlock Plug
5 Cord Grip
6 Outer Shell
Remove outer shell and loosen
cord grip.
7 2-Conductor Cord (Not Sup-
plied)
10 8 Plug Terminal
11
9 Strip cord jacket back enough to
separate conductors. Strip con-
ductors enough to make good con-
tact with plug terminals. Connect
one wire to each terminal – choice
does not matter. Reinstall outer
shell and cord grip. Tighten assem-
bly screws.
3 9 Knife Terminals (Not Sup-
plied)
8 Cut cord to desired length. Strip
jacket and conductors to correct
length and install knife terminals.
10 Sleeving
5 Slide sleeving past terminals. Con-
6 nect cord leads to slide switch
7 leads using knife terminals. Slide
and secure sleeving over termi-
nals.
4
11 Slide Switch
To close contactor, push switch for-
ward and hold. Release switch to
open contactor.
Close access door.
ST-162 181

Figure 3-9. Remote Control Connections

3-9. 115 Volts AC Duplex Receptacle

1 115 Volts AC Duplex Recep-

1 tacle
This welding power source sup-
plies up to 10 amperes of 115 volts
ac power.
The duplex receptacle is protected
from overload by circuit breaker
CB2 (see Section 7-2).
115V 10 A AC
Close access door.

Figure 3-10. Connecting To 115 Volts AC Duplex Receptacle

TM-315 Page 8 Dialarc HF, HF-P
3-10. Connecting Input Power

WARNING
HIGH-FREQUENCY RADIATION can in- ELECTRIC SHOCK can kill.
terfere with radio navigation, safety ser- • Do not touch live electrical parts.
vices, computers, and communications • Turn Off welding power source, and disconnect in-
equipment. put power before inspecting or installing.
• Have only qualified person familiar with electronic • Have only qualified persons install unit.

•
equipment perform this installation.
Read and follow entire Section 8 for proper location
• Installation must meet National Electrical Code and
all other codes.
and installation requirements for high-frequency
equipment before installing unit. swarn13.2 4/93

A. Positioning Jumper Links

Jumper links allow operation on

different input voltages and are
factory set for the highest input
voltage.
Check input voltage available at
site.
Remove side panel to check jump-
er links.
1 Input Voltage Label – Only
One Is On Unit
Look at jumper links and compare
link position with unit label.
2 Input Voltage Jumper Links
Move links to match input voltage.
For example, use 230 volts posi-
tion when 230 volts input power is
available.
Reinstall side panel or go on to
Figure 3-12.

200 VOLTS 230 VOLTS 460 VOLTS

L L L L L L
S-083 566-C 2
1

230 VOLTS 460 VOLTS 575 VOLTS

L L L L L L
S-010 587-B

Tools Needed:
3/8 in

ssb5.1 2/92 – ST-070 399-D

Figure 3-11. Input Voltage Jumper Links Location

Dialarc HF, HF-P TM-315 Page 9
B. Connecting Input Power

Have only qualified persons make

this installation.
Remove side panel.
1 Line Disconnect Device Of
Proper Rating
1 2 Input Conductors
3 Grounding Conductor
Select size and length using
Table 3-2. Conductor rating must
8 comply with national, state, and lo-
cal electrical codes. Use lugs of
proper amperage capacity and cor-
rect hole size.
4 Strain Relief Connector
Insert conductors through strain
relief.
5 Input Terminal Board
6 Line Terminals
5 2 7 Ground Terminal
Connect grounding conductor and
input conductors to line terminals
and to ground terminal.
4 Install and connect grounding con-
ductor and input conductors in con-
duit or equivalent to deenergized
line disconnect device.
Be sure grounding conductor goes
to an earth ground.
Reinstall side panel.
8 Overcurrent Protection
7 6
Select type and size using
Tools Needed: Table 3-2. Install into deenergized
3 line disconnect device (fused dis-
connect switch shown).
3/8, 7/16, 1/2 in ssb2.4 3/93 – ST-070 399-E

Figure 3-12. Input Power Connections

Table 3-2. Electrical Service Requirements*

NOTE All values calculated at 60% duty cycle.

Electrical Service Requirements With Power Factor Correction Without Power Factor Correction
Input Voltage 200 230 460 575 200 230 460 575
Input Amperes At Rated Output 87 76 38 30 103 90 45 36
Recommended Standard Fuse Or Circuit
125 125 60 45 150 125 70 50
Breaker Rating In Amperes1
Input Conductor Size In AWG/Kcmil2 4 6 10 10 4 4 8 10
131 116 203 317 124 164 295 311
Max Input Conductor Length In Feet (Meters)3 (40) (35) (62) (97) (38) (50) (90) (95)
Grounding Conductor Size In AWG/Kcmil4 6 6 10 10 6 6 8 10
* These values are calculated from the 1993 edition of the National Electrical Code (NEC).
1 Recommended fuse or circuit breaker size is that closest to 150% of rated input amperage of the welding power source. Article 630-12(a) of NEC
allows fuse or circuit breaker sizing up to 200% of rated input amperage.
2 Input conductor size is for insulated copper wire with 75°C rating with not more than three single current-carrying conductors in a cable or raceway
(Table 310-16 of NEC).
3 Maximum length is to prevent more than a 3% voltage drop between service entrance and input terminals of the welding power source (Articles
210-19(a) and 215-2(b) of NEC).
4 The grounding conductor shall be colored or identified as specified in the NEC. Grounding conductor size for copper wire is not required to be
larger than input conductor (Article 250-95 of NEC). S-0092-G
TM-315 Page 10 Dialarc HF, HF-P
 SECTION 4 – OPERATION
WARNING
ELECTRIC SHOCK can kill. ARC RAYS can burn eyes and skin;
• Always wear dry insulating gloves. NOISE can damage hearing.
• Insulate yourself from work and ground. • Wear welding helmet with correct shade of filter.
• Do not touch live electrical parts. • Wear correct eye, ear, and body protection.
• Keep all panels and covers securely in place.
MOVING PARTS can cause injury.
FUMES AND GASES can be hazardous
to your health. • Keep away from moving parts.
• Keep your head out of the fumes. • Keep all doors, panels, covers, and guards closed
and securely in place.
• Ventilate area, or use breathing device.
• Read Material Safety Data Sheets (MSDSs) and
manufacturer’s instructions for material used. MAGNETIC FIELDS FROM HIGH CUR-
RENTS can affect pacemaker operation.
WELDING can cause fire or explosion. • Pacemaker wearers keep away.
• Do not weld near flammable material.
• Wearers should consult their doctor before going
• Watch for fire; keep extinguisher nearby. near arc welding, gouging, or spot welding opera-
• Do not locate unit over combustible surfaces. tions.
• Do not weld on closed containers.
See Safety Precautions at beginning of manual for ba-
• Allow work and equipment to cool before handling. sic welding safety information. swarn6.1 10/91

1 1 Amperage Adjustment Con-

2 trol
3
2 Amperage Control Switch
4
3 Output (Contactor) Control
Switch
4 Power Switch
5 High Frequency Switch
9 5 6 Postflow Time Control
8 7 Circuit Breakers CB1 And
CB2 (Section 7-2B)
8 Range Selector Switch
9 AC/DC Selector Switch
7

ST-070 400-C

Figure 4-1. Controls

1 2 3 1 Insulating Gloves
2 Safety Glasses With Side
Shields
3 Welding Helmet
Wear dry insulating gloves, safety
glasses with side shields, and a
welding helmet with a correct
shade of filter (see ANSI Z49.1).
sb3.1 10/91

Figure 4-2. Safety Equipment

Dialarc HF, HF-P TM-315 Page 11
 1 Work Clamp
1 Tools Needed: Connect work clamp to a clean,
paint-free location on workpiece,
as close to weld area as possible.
Use wire brush or sandpaper to
clean metal at weld joint area. Use
chipping hammer to remove slag
after welding.
sb4.1 2/93

Figure 4-3. Work Clamp

WARNING
ELECTRIC SHOCK can kill. ARCING can damage switch.
• Do not use AC output in damp areas, if movement is • Do not change AC/DC Selector switch or Range
confined, or if there is a danger of falling. Selector switch position while welding.
• Use AC output ONLY if required for the welding Arcing inside switch can damage contacts, causing
process. switch to fail.
• If AC output is required, use remote output control.
• Read Safety Precautions at beginning of this
manual. warn6.3 4/92 / warn5.1* 2/93

1 AC/DC Selector Switch

Use switch to select polarity and
1 2 type of weld output.
2 Range Selector Switch
Use switch to select ac or dc weld
amperage range.
If desired amperage is in the over-
lapping area of two ranges, set
switch in the lower range for better
fine amperage control (see
Figure 4-7).

Ref. ST-071 975-F

Figure 4-4. AC/DC Selector Switch And Range Selector Switch

1 Amperage Adjustment Con-

trol
Use control to adjust amperage
within range selected by Range
1
Selector switch.
The numbers are a percentage of
the range selected and not an actu-
al value.
Control may be adjusted while
welding.

Figure 4-5. Amperage Adjustment Control

TM-315 Page 12 Dialarc HF, HF-P
 WARNING
ELECTRIC SHOCK can kill.
• Do not touch live electrical parts.
• Do not touch weld output terminals when contactor is energized.
• Do not touch electrode and work clamp at the same time. swarn7.1 10/91

Weld output terminals are energized when 1 Output (Contactor) Control

switch is On and Power is On. Switch
Use switch to select way of control-
ling unit output.
1
For front panel control, place
switch in On position.
For remote control, place switch in
Remote position (see Section 3-8).

Figure 4-6. Output (Contactor) Control Switch

1 Amperage Control Switch

1
Use switch to select way of control-
ling amperage adjustment.
For front panel control, place switch
in Panel position.
For remote control, place switch in
Remote position. See Example be-
low.
2 Remote Foot Control
3 Fingertip Control

EXAMPLE Of Combination Remote Amperage Control

In Example:
Min = 140 A AC
Percentage Of Range = 50%
Max = 225 A AC (50% of 140 to 310)

Min (140 A AC)

Max (225 A AC)

Set Switches Set Range Set Percentage Adjust Remote Control

ST-159 059

Figure 4-7. Amperage Control Switch

Dialarc HF, HF-P TM-315 Page 13
 1 Postflow Time Control
Use control to set the length of time
gas (and water if applicable) flows
REMOTE after the welding stops.
OUTPUT
(CONTACTOR) Adjust time according to size of
tungsten electrode in torch.

To Use Connect
Postflow Remote Device
Time Control
1

Figure 4-8. Postflow Time Control

WARNING
USING HIGH FREQUENCY WITH THE SHIELDED METAL ARC WELDING PROCESS can result in
serious personal injury.
• Place the High Frequency switch in the Off position before using the Shielded Metal Arc Welding (SMAW) process.

1 High Frequency Switch

1 Start position provides HF for arc

starting only.
REMOTE Off position provides no HF. Use
OUTPUT OFF for SMAW welding.
(CONTACTOR)
Continuous position provides HF
continuously throughout the weld.

To Use Connect
High Frequency Remote Device
Circuit

Figure 4-9. High Frequency Switch

TM-315 Page 14 Dialarc HF, HF-P
 1 Power Switch
Use switch to turn unit On and Off.

Figure 4-10. Power Switch

WARNING
BUILDUP OF SHIELDING GAS can harm health or kill.
• Shut off shielding gas supply when not in use.

warn1.1 9/91

1 Shielding Gas Cylinder

2 Valve
2
3 Foot Control
1 Open valve on cylinder just before
3 welding.
Foot control turns weld output and
gas flow on and off.
Close valve on cylinder when fin-
ished welding.

sb5.3 6/92 – S-0621-C

Figure 4-11. Shielding Gas

Install & Select Put On Insert Turn On

Connect Electrode Personal Safety Set Controls Electrode Welding Power
Equipment Equipment Into Holder Source

Begin Welding

ssb7.1* 9/92

Figure 4-12. Sequence Of Shielded Metal Arc Welding (SMAW)

Install & Insert Put On Turn On

Connect Select Tungsten Tungsten Personal Safety Set Controls Shielding Gas
Equipment Into Torch Equipment

Turn On
Welding Power Begin Welding
Source
ssb8.1* 12/92

Figure 4-13. Sequence Of Gas Tungsten Arc Welding (GTAW)

Dialarc HF, HF-P TM-315 Page 15
 SECTION 5 – THEORY OF OPERATION
1 Input Terminal Board TE1
Provides means for operation on
5
different input voltages.
2 Power Switch S1 Circuit Breaker
Provides on/off control of welding CB1
power source.
3 Main Transformer T1
Supplies power to weld output cir- 30 VAC
cuit, control circuits, and fan motor
FM.
4 Fan Motor FM 4
Provides cooling of internal com-
ponents. Fan Motor
5 Circuit Breaker CB1 FM W

Provides overload protection for

amperage control circuit. 230 AC
6 Integrated Rectifier SR2 1 2 3 VAC
Changes the 30 volts ac output 1φ 1φ
Single-Phase Input Power Main
from T1 to full-wave rectified dc. Terminal Transformer
Line Input Switch S1
7 Amperage Adjustment Con- Power Board TE1 T1
trol R1
Selects weld output amperage lev-
el. 10
8 Amperage Control Switch S2
Contactor 24 VAC
Selects Panel or Remote amper- Control Relay
age control. CR3 115
9 Remote Amperage Control VAC
Receptacle RC1
Connects remote amperage con- 11 13 12
trol. Remote 115 115 VAC
Contactor Duplex VAC Circuit Breaker
10 Contactor Control Relay CR3 Control Receptacle CB2 115 VAC
Receptacle RC2 RC3
Provides means for remote con-
tactor switch to turn on and off weld
115
output.
VAC
11 Remote Contactor Control 11♦ 17
Receptacle RC2 Output
Remote
Connects remote contactor con- Contactor (Contactor)
trol. Switch Control Switch
S3
12 Circuit Breaker CB2 115
VAC
Provides overload protection for
contactor control circuit and duplex 18
receptacle RC3.
Postflow Time
13 Duplex Receptacle RC3 Control, Timer
Connects auxiliary equipment to TD1
welding power source.
CR2
14 Thermostat TP1
If unit overheats, TP1 opens stop- 19 19 ♦
ping all weld output.
15 Contactor W Gas Valve Water Valve
GS1 WS1
Connects secondary output of
main transformer T1 to magnetic
amplifier MA1.
16 Gas/Water Control Relay AC Or DC Control Circuits DC Weld Current Circuit
CR2
Provides control of shielding gas 1φ Power External Circuits
and coolant.
♦ Optional
AC Weld Current Circuit

Figure 5-1. Functional Diagram

TM-315 Page 16 Dialarc HF, HF-P
 17 Output (Contactor) Control
Switch S3
6 7 8 9
Selects On or Remote contactor
Amperage Remote control.
Integrated Amperage Amperage
Adjustment Control Switch 18 Postflow Time Control, Timer
Rectifier SR2 Control R1 Control
S2 Receptacle RC1 TD1
Selects shielding gas and coolant
postflow time.
9♦
19 Gas Valve GS1 And Water
Remote Valve WS1
Amperage
Control Provide shielding gas and coolant
during the weld cycle.
23 24
20 High Frequency Switch S6
Magnetic Range 27
Selects Off, Start, or Continuous
Amplifier Selector
MA1 Switch S4 high frequency output.
21 High Frequency Transformer
26
T2
30
25 Stabilizer AC/DC Steps up input voltage and
DC Selector Switch Work Weld charges capacitor C2.
Z1 Output
S5
Main Rectifier Terminal 22 Spark Gaps G1 And High
SR1 Frequency Coupling Coil T3
G1 provides path for C2 to dis-
charge into T3. T3 supplies high
frequency to welding circuit.
23 Magnetic Amplifier MA1
28
Controls output current with satu-
Integrated ration of its core. Variation of satu-
Rectifier ration changes impedance (hin-
SR3 drance) of amperage flow thereby
14 15 varying weld output. A small dc
control current controls a large
CR3 29
Thermostat Contactor amount of weld output current.
TP1 W Voltage 24 Range Selector Switch S4
Sensing
Control Relay Selects coarse range of weld out-
CR1 put from magnetic amplifier MA1.
16
25 Main Rectifier SR1
Gas/Water 22 30
Control Relay Changes the ac output from T1 to
CR2 Electrode Weld full-wave rectified dc.
High Output
Terminal 26 Stabilizer Z1
Frequency
Coupling Coil Smooths weld output current.
T3
27 AC/DC Selector Switch S5
Provides either AC or DC and out-
22 put polarity.

Spark Gaps G1, 28 Integrated Rectifier SR3

Capacitor C2 Changes ac to dc to operate CR1
in ac mode.
29 Voltage Sensing Control
21 Relay CR1
Controls operation of high frequen-
High Frequency cy when S6 is in Start position.
Transformer T2
30 Electrode And Work Weld
Output Terminals
CR1 CR2 Provide weld output.
20

High Frequency
Switch S6

Dialarc HF, HF-P TM-315 Page 17

 SECTION 6 – TROUBLESHOOTING
6-1. Troubleshooting Table

WARNING
ELECTRIC SHOCK can kill. HOT PARTS can cause severe burns.
• Do not touch live electrical parts. • Allow cooling period before servicing unit.
• Turn Off welding power source, and disconnect
input power before inspecting, maintaining, or
servicing.
• Disable high frequency by placing High Frequency
switch S6 in Off position before testing unit.
MOVING PARTS can cause injury. Have only qualified persons familiar with and following
• Keep away from moving parts. standard safety practices perform troubleshooting
procedures.
smwarn1.7* 12/93

Table 6-1. Troubleshooting

NOTE Use MILLER Testing Booklet (Part No. 150 853) when checking solid-state parts.

Trouble Remedy Section

Unit completely inoperative. Place line disconnect device in On position. 3-10B
Check line fuse(s); replace if open. Reset circuit breakers. 3-10B
Check for proper input power connections. 3-10B
Check for proper jumper link position. 3-10A
Check continuity of Power switch S1, and replace if necessary. 6-2
Check main transformer T1 for signs of winding failure. Check 6-2
continuity across windings, and check for proper connections.
Check secondary voltages. Replace T1 if necessary.

No weld output; fan operating. Unit overheated; allow unit to run with fan on so thermostat TP1 7-2A
resets.
If Output (Contactor) switch S3 is in Remote position, connect re- 3-8,
mote contactor control to remote contactor control receptacle Figure 4-6
RC2.
Reset circuit breaker CB2. 7-2B
Check continuity of Range Selector switch S4. Check condition 6-2
of contacts. Repair or replace S4 if necessary.
Check continuity of AC/DC Selector switch S5. Check condition 6-2
of contacts. Repair or replace S5 if necessary.
Check coil voltage and connections of contactor control relay 6-2
CR3. Check continuity of coil and condition of contacts. Replace
CR3 if necessary.
Check coil voltage and connections of contactor W. Check conti- 6-2
nuity of coil and condition of contacts. Replace W if necessary.
Check main transformer T1 for signs of winding failure. Check 6-2
continuity across windings, and check for proper connections.
Check secondary voltages. Replace T1 if necessary.

Low or high weld output; Amperage Ad- Reset circuit breaker CB1. 7-2B
justment Control R1 does not control
weld output.
If Amperage Control switch S2 is in Remote position, connect re- 3-8,
mote amperage control to remote amperage control receptacle Figure 4-7
RC1.

TM-315 Page 18 Dialarc HF, HF-P

 Trouble Remedy Section
Check line voltage for correct input across line input terminals on 6-2
input terminal board TE1. If line voltage is low or high, contact lo-
cal electric utility.
Check for proper jumper link position. 3-10A
Check resistance and connections of Amperage Adjustment con- 6-2
trol R1; R1 is 0 to 15 ohms ±10%. Replace R1 if necessary.
Check integrated rectifier SR2, and replace if necessary. 6-2
Check dc control winding CWD of magnetic amplifier MA1 for 6-2
signs of winding failure. Check continuity across windings, and
check for proper connections. Check voltage across winding. Re-
place MA1 if necessary.

Erratic weld output. Clean and tighten all weld connections. 3-7
Be sure electrode is dry and proper type for SMAW. ––
Be sure tungsten is correct size for GTAW. ––
Use proper size and type weld cable. 3-3
Check diodes in main rectifier SR1, and replace if necessary. 6-2

Excessive line amperage; line fuse(s) Check for proper jumper link position. 3-10A
and/or circuit breaker(s) open repeat-
edly.
Check main transformer T1 for signs of winding failure. Check 6-2
continuity across windings, and check for proper connections.
Check secondary voltages. Replace T1 if necessary.
For models with power factor correction, check power correction 6-2
capacitors C1 for bulges, oil leakage, or other damage. Check C1
for a short, and check for proper connections. Replace C1 if nec-
essary.
For models with power factor correction, check power factor wind- 6-2
ing of main transformer T1 by measuring the voltage across pow-
er factor correction capacitor C1. Replace T1 if necessary.

Lack of high frequency; difficulty in es- Select proper size tungsten. ––

tablishing an arc.
Place High Frequency switch S6 in correct position. Figure 4-9
Check cables and torch for cracked insulation or bad connec- ––
tions. Be sure torch cable is not close to any grounded metal. Re-
pair or replace necessary parts.
Check spark gaps G1, and adjust if necessary. 7-3
Check continuity of High Frequency switch S6, and replace if nec- 6-2
essary.
Check capacitor C2 for a short or open, and check for proper con- 6-2
nections. Replace C2 if necessary.
If no high frequency with High Frequency switch S6 in Start posi- 6-2
tion, check coil voltage and connections of voltage sensing con-
trol relay CR1. Check continuity of coil and condition of contacts.
If CR1 is replaced, be sure that CR1 energizes when open-circuit
voltage is present and deenergizes when an arc is struck. Adjust
resistor R3 for proper operation of CR1 if necessary.
If no high frequency with High Frequency switch S6 in Continuous 6-2
position, check coil voltage and connections of gas/water control
relay CR2. Check continuity of coil and condition of contacts. Re-
place CR2 if necessary.
Check high frequency transformer T2 for signs of winding failure. 6-2
Check continuity across windings, and check for proper connec-
tions. Check primary voltage. Replace T2 if necessary.

Dialarc HF, HF-P TM-315 Page 19

 Trouble Remedy Section
Gas valve GS1 and/or optional water Check coil voltage and connections of contactor control relay 6-2
valve WS1 not operating properly. CR3. Check continuity of coil and condition of contacts. Replace
CR3 if necessary.
Check for approximately 15 seconds on postflow timer TD1. Re- 6-2
place TD1 if necessary.
Check coil voltage and connections of gas valve GS1 and option- 6-2
al water valve WS1. Check continuity of coils. Replace GS1 and
WS1 if necessary.

Fan motor FM does not run. Check and clear blocked fan blade. ––
Check coil voltage and connections of fan motor FM, and replace 6-2
if necessary.

Wandering arc – poor control of direc- Reduce gas flow rate. 3-5
tion of arc.
Properly prepare and select tungsten. ––

Tungsten electrode oxidizing and not Shield weld zone from drafts. ––
remaining bright after conclusion of
weld.
Check for approximately 15 seconds on postflow timer TD1. Re- 6-2
place TD1 if necessary.
Check and tighten all gas fittings. ––
Properly prepare tungsten. ––
Replace torch parts if water has leaked into torch. ––

Electronic equipment in welding area HF interference problem. Check for proper installation, and cor- 8
not working properly. rect problem.

TM-315 Page 20 Dialarc HF, HF-P

 NOTES

Dialarc HF, HF-P TM-315 Page 21

6-2. Troubleshooting Circuit Diagram For Welding Power Source

WARNING
ELECTRIC SHOCK can kill.
• Do not touch live electrical parts.
• Turn Off welding power source before making or changing meter lead connections and before disconnecting or connecting
any leads.
• Disable high frequency by placing High Frequency switch S6 in Off position before testing unit.
Have only qualified persons familiar with and following standard safety practices perform troubleshooting procedures.
smwarn2.6* 12/93

Test Equipment Needed:

See Secion 3-8 for
RC1 information
V3

R1
I1

V2 V4

V1
R1

V5 V6

V7
V10

V9
V11

V12

V8
V13
V14

See Secion 3-8 for

RC2 information
W – Contactor
CR1 – Voltage Sensing Control Relay
CR2 – Gas/Water Control Relay
CR3 – Remote Contractor Control Relay
TD1 – Postflow Delay Timer

Figure 6-1. Troubleshooting Circuit Diagram For Welding Power Source

TM-315 Page 22 Dialarc HF, HF-P
 Resistance Values Voltage Readings
a) Tolerance – ±10% unless specified a) Tolerance – ±10% unless specified
b) Turn Off unit and disconnect input b) Reference – to circuit common (Gnd)
power before checking resistance unless noted
R1 All values for T1 are less than 1 ohm c) Wiring Diagram – see Section 9
R2 Less than 1 ohm V1 230 volts ac
R3 5 ohms V2 30 volts ac
R4 6120 ohms V3 24 volts dc
V4 0 to 26 volts dc from min to max of
Amperage Adjustment control R1
V5 74 volts ac
V6 85 volts ac
V7 115 volts ac
V8 24 volts ac
V9 460 volts ac
V10 115 volts ac with contactor W energized
V11 115 volts ac with S3 in On position or CR3
energized
V12 115 volts ac
V13 24 volts ac with remote contactor switch
closed
V14 115 volts ac during postflow
V15 12 to 15 volts dc
V16 115 volts ac with S6 in Continuous position
and CR2 energized
V17 75 volts ac/dc open-circuit voltage

CR1 energizes when open-circuit

voltage is present; deenergizes when
an arc is struck, typically 35 volts.
Adjust R3 for proper operation of
CR1 if necessary.

V17
R2 A,B,C,D
V15

See Section 6-3 for

waveforms A thru D

R4

V16/R3
Amperage Readings
a) Tolerance – ±5% unless specified
I1 0 to 6.6 amperes dc from min to max of
Amperage Adjustment control R1

SB-138 355

Dialarc HF, HF-P TM-315 Page 23

6-3. Waveforms For Section 6-2

WARNING
ELECTRIC SHOCK can kill.
• Do not touch live electrical parts.
• Turn Off welding power source before making or changing any test equipment leads or cable connections.
• Disable high frequency by placing High Frequency switch S6 in Off position before testing unit.
Have only qualified persons familiar with and following standard safety practices perform troubleshooting procedures.
smwarn3.1* 12/93

5 ms 20 V 5 ms 5 V

A. DC Open-Circuit Voltage, Range Selector B. 20.3 Volts DC, 24 Amperes, Range Selec-
Switch S4 In Low Position tor Switch S4 in Low Position (Resistive
Load)

5 ms 50 V 5 ms 10 V

C. AC Open-Circuit Voltage, Range Selector D. 20 Volts AC, 28 Amperes, Range Selector

Switch S4 In Low Position Switch S4 In Low Position (Resistive Load)

Test Equipment Needed:

Figure 6-2. Waveforms For Section 6-2

TM-315 Page 24 Dialarc HF, HF-P
6-4. Input Voltage Labels And Connection Diagrams

WARNING
ELECTRIC SHOCK can kill.
• Do not touch live electrical parts.
• Turn Off welding power source, and disconnect input power before inspecting or servicing.

Have only qualified persons familiar with and following standard safety practices perform troubleshooting procedures.
smwarn4.1 12/93

1 Input Voltage Label And

Connection Diagram – Only
One Label Is On Unit
2 Input Terminal Board TE1

200 VOLTS 230 VOLTS 460 VOLTS

L L L L L L
S-083 566-C

Test Equipment Needed:

230 VOLTS 460 VOLTS 575 VOLTS
L L L L L L
S-010 587-B

ST-070 399-D / SA-092 209-A / SA-145 142-B

Figure 6-3. Input Voltage Labels And Connection Diagrams

Dialarc HF, HF-P TM-315 Page 25
 SECTION 7 – MAINTENANCE
WARNING
ELECTRIC SHOCK can kill. MOVING PARTS can cause injury.
• Do not touch live electrical parts. • Keep away from moving parts.
• Turn Off welding power source, and disconnect
input power before inspecting, maintaining, or
servicing.

HOT PARTS can cause severe burns.

• Allow cooling period before maintaining or
servicing.
Maintenance to be performed only by qualified
persons. swarn8.1 2/93

7-1. Routine Maintenance

3 Months Turn Off all power before maintaining. 6 Months

Replace Blow Out

OR Or
See Unreadable
Labels Vacuum
Parts Inside
List ––

Tape Or
Replace
Cracked
Cables
––

Clean
And
Tighten
Weld
3-7 Terminals Ref. ST-070 399-D

Figure 7-1. Maintenance Schedule

7-2. Overload Protection

WARNING READ SAFETY BLOCKS at start of

Section 7 before proceeding.

A. Overheating
Thermostat TP1 protects the unit from damage due to overheating. If main transformer T1 gets too hot, TP1 opens and
weld output stops. The fan keeps running to cool the transformer. Wait several minutes before trying to weld.

TM-315 Page 26 Dialarc HF, HF-P

B. Circuit Breakers CB1 And CB2

See Figure 4-1 for circuit breaker

location.
1 Circuit Breaker CB1
1 CB1 protects the amperage control
circuit from overload. If CB1 opens,
weld output drops to the minimum
CB2 of the range selected.
2 Circuit Breaker CB2
CB2 protects the contactor control
circuit and duplex receptacle from
overload. If CB2 opens, weld out-
put and output to duplex stops.
2
Press button to reset circuit break-
er.
Close access door.
Ref. ST-071 975-F / Ref. S-071 983-E

Figure 7-2. Circuit Breakers CB1 And CB2

7-3. Adjusting Spark Gaps

WARNING READ SAFETY BLOCKS at start of

Section 7 before proceeding.

Turn Off welding power source and

disconnect input power.
Loosen screw on lower front panel
and open access door.
1 Tungsten End Of Point
Do not clean or dress tungsten.
Replace point if tungsten end dis-
appears.
2 Spark Gap
Normal spark gap is 0.008 in
(0.203 mm).
If spark gaps are okay, reinstall
door. If adjustment is needed, con-
tinue as follows:
3 Adjustment Screws
Loosen screws. Place gauge of
proper thickness in spark gap.
4 Pressure Point

2 Apply slight pressure at point until

gauge is held firmly in gap. Repeat
gauge adjustment with other gap.
4 Tighten adjustment screws.
Close access door.
3
1
Tools Needed:

4 5/32 in
3

ST-070 400-C / Ref. S-0043

Figure 7-3. Adjusting Spark Gaps

Dialarc HF, HF-P TM-315 Page 27
 SECTION 8 – HIGH FREQUENCY
mod6.1 4/93

WARNING
HIGH-FREQUENCY RADIATION can interfere with radio navigation, safety services, computers,
and communications equipment.
• Have only qualified person familiar with electronic equipment perform this installation.
• The user is responsible for having a qualified electrician promptly correct any interference problem resulting from the
installation.
• If notified by the FCC about interference, stop using the equipment at once.
• Have the installation regularly checked and maintained.
• Keep high-frequency source doors and panels tightly shut, keep spark gaps at correct setting, and use grounding and
shielding as shown in Figure 8-3 to minimize the possibility of interference.

1 Gas Tungsten Arc Torch

1 2 High-Frequency Voltage
Used to help arc jump air gap be-
3 tween torch and workpiece and/or
stabilize the arc.
4
2 3 Submerged Arc Welding Gun
5
4 Flux
Work Work 5 High-Frequency Voltage
Used to help arc reach workpiece
Gas Tungsten Arc Submerged Arc through flux granules.
Welding (GTAW) Welding (SAW) S-0693

Figure 8-1. Welding Processes Requiring High Frequency

1 Sources Of Direct High-Fre-

quency Radiation
Weld Zone
High-frequency source (welding
3 power source with built-in HF or
separate HF unit), weld cables,
50 ft torch, work clamp, workpiece, and
(15 m) 3
work table.
2 Sources Of Conduction Of
High Frequency
3
Input power cable, line disconnect
3 2 switch, and input supply wiring.
3 Sources Of Reradiation Of
1 High Frequency
Ungrounded metal objects, light-
ing, wiring, water pipe and fixtures,
1 external phone and power lines.
2

S-0694

Figure 8-2. Sources Of High-Frequency Radiation From Incorrect Installation

TM-315 Page 28 Dialarc HF, HF-P
 7

Weld Zone

3 50 ft
(15 m) 50 ft
(15 m)

1
6

2
9

9 Ground All
Metal Objects
And All Wiring
In Welding Zone
Using #12 AWG Wire
Ground
Workpiece
If Required
By Codes
Nonmetal
Building
8

9
9
11

Metal Building

10

S-0695

1 High-Frequency Source (Welder With 5 Conduit Joint Bonding 9 Grounding Rod

Built-In HF Or Separate HF Unit) Electrically join (bond) all conduit sections
Ground metal machine case, work output using copper straps or braided wire. Ground Consult the National Electrical Code for
terminal, line disconnect switch, input sup- conduit every 50 ft (15 m). specifications.
ply, and worktable. 6 Water Pipe And Fixtures
10 Windows And Doorways
2 Center Point Of Welding Zone Ground water pipe every 50 ft (15 m).
Midpoint between high-frequency source 7 External Power Or Telephone Lines Cover all windows and doorways with
and welding torch. grounded copper screen of not more than
Locate high-frequency source at least 50 ft 1/4 in (6.4 mm) mesh.
3 Welding Zone (15 m) away from power and phone lines.
A circle 50 ft (15 m) from center point in all 8 Metal Building Panel Bonding Meth- 11 Overhead Door Track
directions. ods
Bolt or weld building panels together, install Ground the track.
4 Weld Output Cables
copper straps or braided wire across
Keep cables short and close together. seams, and ground frame.

Figure 8-3. Correct Installation

Dialarc HF, HF-P TM-315 Page 29
 SECTION 9 – ELECTRICAL DIAGRAMS

. The circuits in this manual can be used for troubleshooting, but there might be minor circuit differences from your machine. Use circuit inside
machine case or contact factory for actual circuit, if needed.
The following is a list of all diagrams for models covered by this manual. To order a copy, proceed as follows:
1 Know unit Model and Serial or Style Number.
2 Use this list to find diagram number.
3 Include your FAX number or mailing address with your request.
4 FAX Technical Publications Department at 414-735-4011 or call 414-735-4356.

Circuit Wiring Main Reason

Model Serial Or Style Number
Diagram Diagram For Change

Dialarc HF, HF-P HF826825 thru HF872901 CB-901 782-1A1♦♦

HF872902 thru HG006433 CB-901 782-1B1♦♦

HG006434 thru HK326426 CB-901 782-1C♦♦

HK326427 thru HK353363 B-049932♦♦

HK353364 thru JB488890 B-046 186♦♦

JB488891 thru JD678601 SN-089 298

JD678602 thru JH158134 B-090 669-B♦♦ Not available

JH158135 thru KA823683 B-113 138♦♦ Added HF capacitors

KA823684 thru KB048221 B–137 410♦♦ D-140 351♦♦ Added ground to RC3

KB048222 and following SB-138 355 SD-144 378 Added Amp connectors

Circuit Board TD1 HF826825 and following SA-044 725-B

♦♦ Not included in this manual

TM-315 Page 30 Dialarc HF, HF-P

 SN-089 298

Figure 9-1. Circuit Diagram For Dialarc HF Effective With Serial No. JB488891 Thru JD678601

SB-138 355

Figure 9-2. Circuit Diagram For Dialarc HF Effective With Serial No. KB048222 And Following
Dialarc HF, HF-P TM-315 Page 31
 Figure 9-3. Wiring Diagram For Dialarc HF Effective With Serial No. KB048222 And Following
TM-315 Page 32 Dialarc HF, HF-P
 SD-144 378

Dialarc HF, HF-P TM-315 Page 33

 SA-044 725-B

Figure 9-4. Circuit Diagram For Postflow Timer TD1 Effective With Serial No. HF826825 And Following

TM-315 Page 34 Dialarc HF, HF-P

 May 1995 Form: TM-315
Effective With Serial No. HF826825

SECTION 10 – PARTS LIST

Dialarc HF And HF-P

For SMAW And GTAW Welding

Dialarc HF, HF-P TM-315 Page 35

 2
TM-315 Page 36

1
3 14

15

4
13

16

6 Figure 10-7
12
7 8 9
18
10 11
19 17

24

23

Figure 10-8

21 20
Dialarc HF, HF-P

25 Figure 10-6 Figure 10-2

Figure 10-3 &

22
Figure 10-4

Figure 10-1. Main Assembly

 Quantity
Model
Item Dia. Part Without With
No. Mkgs. No. Description PFC PFC

Figure 10-1. Main Assembly

... 1 . . . . . . . . . . . . . . 000 073 . . . COVER, top . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 . . . . 1

... 2 . . . . . . . . . . . . . . 026 627 . . . GASKET, lifting eye cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 . . . . 1
... 3 . . . . . . . . . . . . . . 144 697 . . . FRAME, lifting (Eff w/JD724465) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 . . . . 1
... 4 . . . . . . . . . . . . . . 109 035 . . . LABEL, warning electric shock can kill etc . . . . . . . . . . . . . . . . . . . . 1 . . . . 1
... 5 . . . . . . . . . . . . +000 072 . . . PANEL, side (Prior to JB510828) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 . . . . 2
... 5 . . . . . . . . . . . . +070 197 . . . PANEL, side (Eff w/JB510828) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 . . . . 2
... 6 . . . . . . . . . . . Figure 10-7 . . . MOUNTING BOARD, w/components . . . . . . . . . . . . . . . . . . . . . . . . 1 . . . . 1
... 7 . . . . . . . . . . . . . . 000 382 . . . LINK, connecting contactor term (Prior to JH296872) . . . . . . . . . . 2 . . . . 2
... 7 . . . . . . . . . . . . . . 114 786 . . . LINK, connecting contactor term (Eff w/JH296872) . . . . . . . . . . . . 2 . . . . 2
... 8 . . . . W . . . . . . . 032 786 . . . CONTACTOR, def prp 60A 3P 600V (Prior to JH296872)
(consisting of) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 . . . . 1
.................... 035 837 . . . . . COIL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 . . . . 1
... 8 .... W....... 114 780 . . . CONTACTOR, def prp 60A 3P 115V (Eff w/JH296872)
(consisting of) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 . . . . 1
.................... 114 787 . . . . . COIL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 . . . . 1
. . . 9 . . . SR2 . . . . . . 095 553 . . . RECTIFIER, (Prior to HF872902) . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 . . . . 1
. . . 9 . . . SR2 . . . . . . 035 704 . . . RECTIFIER, integ 40A 800V (Eff w/HF872902) . . . . . . . . . . . . . . . 1 . . . . 1
. . . 10 . . . . . . . . . . . . . . 039 200 . . . ANGLE, reinforcing (Prior to HG029160) . . . . . . . . . . . . . . . . . . . . . 1 . . . . 1
. . . 10 . . . . . . . . . . . . . . 006 209 . . . BRACKET, mtg contactor (Eff w/HG029160 thru JD724464) . . . . 1 . . . . 1
. . . 10 . . . . . . . . . . . . . . 092 615 . . . PLATE, mtg contactor (Eff w/JD724465 thru JH296871) . . . . . . . . 1 . . . . 1
. . . 10 . . . . . . . . . . . . . . 114 785 . . . PLATE, mtg contactor (Eff w/JH296872 and on) . . . . . . . . . . . . . . . 1 . . . . 1
. . . . . . . . . . C8 . . . . . . 003 886 . . . CAPACITOR, (Eff w/HF826825 thru HK353364) . . . . . . . . . . . . . . 1 . . . . 1
. . . 11 . . . . C1 . . . . . . 114 543 . . . CAPACITOR, poly met film 40uf 480VAC . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
. . . 12 . . . . . . . . . . . . . . 025 141 . . . BRACKET, mtg capacitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
. . . 13 . . . . Z . . . . . . . 027 218 . . . STABILIZER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 . . . . 1
. . . 14 . . . MA1 . . . . . 039 234 . . . AMPLIFIER, magnetic (consisting of) . . . . . . . . . . . . . . . . . . . . . . . . 1 . . . . 1
. . . 15 . . . . . . . . . . . . . . 039 175 . . . . . COIL, control AC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 . . . . 4
.................... 039 176 . . . . . COIL, control DC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 . . . . 1
. . . 16 . . . . . . . . . . . . . . 027 212 . . . BAR, stl hr .250 x 1.500 x 18.000 (Prior to JD724465) . . . . . . . . . 1 . . . . 1
. . . 16 . . . . . . . . . . . . . . 092 613 . . . ANGLE, mtg transformer & stabilizer (Eff w/JD724465) . . . . . . . . 1 . . . . 1
. . . 17 . . . . T1 . . . . . . 004 896 . . . TRANSFORMER, pwr main 200/230/460 (Prior to JC656266)
(consisting of) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
. . . 17 . . . . T1 . . . . . . 070 338 . . . TRANSFORMER, pwr main 200/230/460 (Eff w/JC656266 thru
KB048221) (consisting of) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
. . . 17 . . . . T1 . . . . . . 140 551 . . . TRANSFORMER, pwr main 200/230/460 (Eff w/KB048222
and on) (consisting of) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
. . . 18 . . . . . . . . . . . . . . 005 346 . . . . . COIL, pri/sec (Prior to KB048222) . . . . . . . . . . . . . . . . . . . . . . . . . 1
. . . 18 . . . . . . . . . . . . . . 140 434 . . . . . COIL, pri/sec (Eff w/KB048222) . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
. . . 17 . . . . T1 . . . . . . 005 555 . . . TRANSFORMER, pwr main 230/460/575 (Prior to JC656266)
(consisting of) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
. . . 17 . . . . T1 . . . . . . 070 335 . . . TRANSFORMER, pwr main 230/460/575 (Eff w/JC656266 thru
KB048221) (consisting of) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
. . . 17 . . . . T1 . . . . . . 140 552 . . . TRANSFORMER, pwr main 230/460/575 (Eff w/KB048222
and on) (consisting of) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
. . . 18 . . . . . . . . . . . . . . 005 532 . . . . . COIL, pri/sec (Prior to KB048222) . . . . . . . . . . . . . . . . . . . . . . . . . 1
. . . 18 . . . . . . . . . . . . . . 140 439 . . . . . COIL, pri/sec (Eff w/KB048222) . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
. . . 17 . . . . T1 . . . . . . 004 894 . . . TRANSFORMER, 200/230/460 (Prior to JC656266)
(consisting of) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
. . . 17 . . . . T1 . . . . . . 070 336 . . . TRANSFORMER, 200/230/460 (Eff w/JC656266 thru
JB048221) (consisting of) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
. . . 17 . . . . T1 . . . . . . 140 557 . . . TRANSFORMER, 200/230/460 (Eff w/KB048222 and on)
(consisting of) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
. . . 18 . . . . . . . . . . . . . . 005 344 . . . . . COIL, pri/sec (Prior to KB048222) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
. . . 18 . . . . . . . . . . . . . . 140 432 . . . . . COIL, pri/sec (Eff w/KB048222) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Dialarc HF, HF-P TM-315 Page 37

 Quantity
Model
Item Dia. Part Without With
No. Mkgs. No. Description PFC PFC

Figure 10-1. Main Assembly (Continued)

. . . 17 . . . . T1 . . . . . . 004 895 . . . TRANSFORMER, pwr main 230/460/575 (Prior to JC656266)

(consisting of) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
. . . 17 . . . . T1 . . . . . . 070 337 . . . TRANSFORMER, pwr main 230/460/575 (Eff w/JC656266 thru
KB048221) (consisting of) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
. . . 17 . . . . T1 . . . . . . 140 558 . . . TRANSFORMER, pwr main 230/460/575 (Eff w/KB048222
and on) (consisting of) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
. . . 18 . . . . . . . . . . . . . . 005 345 . . . . . COIL, pri/sec (Prior to KB048222) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
. . . 18 . . . . . . . . . . . . . . 140 433 . . . . . COIL, pri/sec (Eff w/KB048222) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
. . . . . . . . . TP1 . . . . . . 020 520 . . . THERMOSTAT, NC (included in transformer) . . . . . . . . . . . . . . . . . 1 . . . . 1
. . . 19 . . . . . . . . . . . . . . 092 614 . . . ANGLE, mtg transformer & stabilizer . . . . . . . . . . . . . . . . . . . . . . . . 1 . . . . 1
. . . 20 . . . . . . . . . . . Figure 10-2 . . . PANEL, rear w/components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 . . . . 1
. . . 21 . . . TE1 . . . . . . 034 587 . . . TERMINAL ASSEMBLY, pri (Figure 10-6) . . . . . . . . . . . . . . . . . . . . 1 . . . . 1
. . . 22 . . . . . . . . . . . . . . 039 221 . . . BASE, (Prior to JB510828) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 . . . . 1
. . . 22 . . . . . . . . . . . . . . 070 190 . . . BASE, (Eff w/JB510828 thru JD724464) . . . . . . . . . . . . . . . . . . . . . 1 . . . . 1
. . . 22 . . . . . . . . . . . . . . 092 682 . . . BASE, (Eff w/JD724465 thru JK674520) . . . . . . . . . . . . . . . . . . . . . 1 . . . . 1
. . . 22 . . . . . . . . . . . . . . 128 397 . . . BASE, (Eff w/JK674521 thru KA882880) . . . . . . . . . . . . . . . . . . . . . 1 . . . . 1
. . . 22 . . . . . . . . . . . . . . 138 295 . . . BASE, (Eff w/KA882881 and on) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 . . . . 1
. . . 23 . . . . . . . . . . . . . . 000 076 . . . HF PANEL, (Prior to JB510828) (Figure 10-8) . . . . . . . . . . . . . . . . 1 . . . . 1
. . . 23 . . . . . . . . . . . . . . 108 324 . . . HF PANEL, (Eff w/JB510828) (Figure 10-8) . . . . . . . . . . . . . . . . . . 1 . . . . 1
. . . 24 . . . . . . . . . . . . . . 092 368 . . . TUBING, stl .250 ID x 16 ga x 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 . . . . 2
. . . 25 . . . . . . . . . . . Figure 10-3 . . . PANEL, front w/components (Prior to JB510828) . . . . . . . . . . . . . . 1 . . . . 1
. . . 25 . . . . . . . . . . . Figure 10-4 . . . PANEL, front w/components (Eff w/JB510828) . . . . . . . . . . . . . . . . 1 . . . . 1
. . . . . . . . . . . . . . . . . . . . 035 942 . . . SWITCH, slide NO (Prior to HG006434) . . . . . . . . . . . . . . . . . . . . . 1 . . . . 1
. . . . . . . . . . . . . . . . . . . . 011 751 . . . SWITCH, slide NO w/leads & clamp (Eff w/HG006434) . . . . . . . . 1 . . . . 1
. . . . . . . . . . . . . . . . . . . . 039 618 . . . PLUG, twlk 2P2W 20A 250V (Eff w/HG006434) . . . . . . . . . . . . . . . 1 . . . . 1

+When ordering a component originally displaying a precautionary label, the label should also be ordered.
BE SURE TO PROVIDE MODEL AND SERIAL NUMBER WHEN ORDERING REPLACEMENT PARTS.

TM-315 Page 38 Dialarc HF, HF-P

 Item Dia. Part
No. Mkgs. No. Description Quantity

Figure 10-2. Panel, Rear w/Components (Figure 10-1 Item 20)

. . . 1 . R2,VS1/
R2,VR1 . 046 819 . . . SUPPRESSOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
. . . 2 . . . . . . . . . . . 039 243 . . . WINDTUNNEL, 14 in (Prior to JK674521) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
. . . 2 . . . . . . . . . . . . 111 936 . . . CHAMBER, plenum 14 in (Eff w/JK674521) . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
. . . 3 . . . . . . . . . . . 010 199 . . . TUBING, stl .275 ID x .048 wall (Prior to JK674521) . . . . . . . . . . . . . . . . . . . . 4
. . . 3 . . . . . . . . . . . 128 325 . . . TUBING, stl .375 OD x .256 ID (Eff w/JK674521) . . . . . . . . . . . . . . . . . . . . . . . 4
. . . 4 . . . . . . . . . . . 032 604 . . . BLADE, fan 14 in 3 wg 19 deg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
. . . . . . . . . . . . . . . . . 016 074 . . . STRIP, adapter conduit (Prior to JK674521) . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
. . . 5 . . . . . . . . . . . 000 074 . . . PANEL, rear (Prior to JK674521) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
. . . 5 . . . . . . . . . . . . 111 987 . . . PANEL, rear (Eff w/JK674521) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
. . . 6 . . . . FM . . . . 116 190 . . . MOTOR, 1/12 hp 230V 1550RPM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
. . . 7 . . . . . . . . . . . . 111 932 . . . JUNCTION BOARD, diode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
. . . 8 . . . SR1 . . . 039 391 . . . RECTIFIER, si diode (Prior to JK674521) (consisting of) . . . . . . . . . . . . . . . . 1
. . . 8 . . . SR1 . . . . 111 935 . . . RECTIFIER, si diode (Eff w/JK674521) (consisting of) . . . . . . . . . . . . . . . . . . 1
. . . 9 . . . . . . . . . . . 037 306 . . . . DIODE, rect 150A 300V RP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
. . . 10 . . . C4-7 . . 031 689 . . . . CAPACITOR, rect . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
. . . 11 . . . . . . . . . . . 037 305 . . . . DIODE, rect 150A 300V SP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

1
4
2

11
10

8 9

ST-002 760-D

Figure 10-2. Panel, Rear w/Components

BE SURE TO PROVIDE MODEL AND SERIAL NUMBER WHEN ORDERING REPLACEMENT PARTS.

Dialarc HF, HF-P TM-315 Page 39

 Figure 10-9

Figure 10-10

SN-000 888-D

Figure 10-3. Panel, Front w/Components (Prior to JB510828)

TM-315 Page 40 Dialarc HF, HF-P

 Item Dia. Part
No. Mkgs. No. Description Quantity
Figure 10-3. Panel, Front w/Components (Prior to JB510828)
(Figure 10-1 Item 25)

. . . 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . NAMEPLATE, (order by model and serial number) . . . . . . . . . . . . . . . . 1

. . . 2 . . . . . . CB2 . . . . . . 011 972 . . . CIRCUIT BREAKER, 10A 250V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
. . . 3 . . . . . . RC3 . . . . . . 039 622 . . . RECEPTACLE, grd str 2P3W 15A 125V . . . . . . . . . . . . . . . . . . . . . . . . . 1
. . . 4 . . . . . . RC1 . . . . . . 039 607 . . . RECEPTACLE, twlk 3P3W 20A 250V . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
. . . . . . . . . . . . . . . . . . . . . . . 605 797 . . . CAP, twlk Arrow-Hart 6312 (RC1)
. . . 5 . . . . . . . S4 . . . . . . 000 071 . . . SWITCH, range (Figure 10-9) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
. . . 6 . . . . . . . . . . . . . . . . . 000 075 . . . PANEL, front . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
. . . 7 . . . . . . CB1 . . . . . . 003 693 . . . CIRCUIT BREAKER, man reset 10A 250V . . . . . . . . . . . . . . . . . . . . . . . 1
. . . 8 . . . . . . S2,3 . . . . . . 011 609 . . . SWITCH, tgl SPST 15A 125V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
. . . 9 . . . . . . . S1 . . . . . . 025 865 . . . SWITCH, tgl DPST 60A 575V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
. . . 10 . . . . . . . R1 . . . . . . 083 671 . . . RHEOSTAT, WW 150W 15 ohm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
. . . 11 . . . . . . . S6 . . . . . . 011 610 . . . SWITCH, tgl SPDT 15A 125VAC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
. . . 12 . . . . . . RC2 . . . . . . 035 493 . . . RECEPTACLE, grd twlk 2P2W 15A 250V (Prior to HG006434) . . . . . . 1
. . . . . . . . . . . . . . . . . . . . . . . 035 494 . . . PLUG, twlk Arrow-Hart 6565 (Prior to HG006434)
. . . 12 . . . . . . RC2 . . . . . . 039 602 . . . RECEPTACLE, twlk 2P3W 15A 250V (Eff w/JG006434) . . . . . . . . . . . . 1
. . . 13 . . . . . . . S5 . . . . . . 000 070 . . . SWITCH, selector (Figure 10-10) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
. . . 14 . . . . . . . . . . . . . . . . . 032 150 . . . BRACKET, mtg timer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
. . . 15 . . . . . . TD1 . . . . . . 052 192 . . . TIMER, delay 0.60 seconds 120V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
. . . 16 . . . . . . . . . . . . . . . . . 038 630 . . . TERMINAL, pwr output (Prior to HG020569) (consisting of) . . . . . . . . . 2
. . . . . . . . . . . . . . . . . . . . . . . 601 840 . . . . NUT, brs hex jam .500-13 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
. . . . . . . . . . . . . . . . . . . . . . . 602 217 . . . . WASHER, lock stl ext tooth .500 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
. . . . . . . . . . . . . . . . . . . . . . . 602 247 . . . . WASHER, flat stl .500 SAE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
. . . . . . . . . . . . . . . . . . . . . . . 038 603 . . . . TERMINAL BOARD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
. . . . . . . . . . . . . . . . . . . . . . . 010 912 . . . . PIN, spring CS .125 x .375 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
. . . . . . . . . . . . . . . . . . . . . . . 038 982 . . . . STUD, brs .500-13 x 2.625 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
. . . . . . . . . . . . . . . . . . . . . . . 601 839 . . . . NUT, brs hex .500-13 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
. . . . . . . . . . . . . . . . . . . . . . . 000 383 . . . BUS BAR, term output (Prior to HG020569) . . . . . . . . . . . . . . . . . . . . . . 1
. . . 16 . . . . . . . . . . . . . . . . . 039 047 . . . TERMINAL, pwr output red (Eff w/HG020569) (consisting of) . . . . . . . 2
. . . 17 . . . . . . . . . . . . . . . . . 601 976 . . . . SCREW, .500-13 x 1.500 hexhd pln steel . . . . . . . . . . . . . . . . . . . . . . . 1
. . . 19 . . . . . . . . . . . . . . . . . 039 049 . . . . TERMINAL BOARD, red . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
. . . 20 . . . . . . . . . . . . . . . . . 601 880 . . . . NUT, stl hex jam .500-13 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
. . . 21 . . . . . . . . . . . . . . . . . 039 044 . . . . BUS BAR, term bd . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
. . . 22 . . . . . . . . . . . . . . . . . 601 879 . . . . NUT, stl hex full fnsh .500-13 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
. . . 23 . . . . . . . . . . . . . . . . . 010 296 . . . FITTING, hose brs M 1/4NPT x .625-18 RH . . . . . . . . . . . . . . . . . . . . . . 2
. . . 24 . . . . . . . . . . . . . . . . . 014 028 . . . ANGLE, mtg valve gas & water . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
. . . 25 . . . GS1, WS1 . . . 035 601 . . . VALVE, 115VAC 2 way 1/4 IPS port 1/8 orf (Prior to HF857570) . . . . . 2
. . . 25 . . . GS1, WS1 . . . 003 538 . . . VALVE, 115VAC 2 way 1/4 IPS port 1/8 orf (Eff w/HF857570) . . . . . . . 2
. . . 26 . . . . . . . . . . . . . . . . . 057 084 . . . BUSHING, snap-in nyl .250 ID x .375 mtg hole . . . . . . . . . . . . . . . . . . . . 2
. . . 27 . . . . . . . . . . . . . . . . . 010 295 . . . FITTING, pipe brs elb M 1/4NPT x .625-18 LH . . . . . . . . . . . . . . . . . . . . 2
. . . 28 . . . . . . . . . . . . . . . +000 077 . . . DOOR, access lower front . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
. . . . . . . . . . . . . . . . . . . . . . . 047 497 . . . LABEL, warning general precautionary . . . . . . . . . . . . . . . . . . . . . . . . . . 1
. . . 29 . . . . . . . . . . . . . . . . . 605 583 . . . CATCH, spring loaded door . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
. . . 30 . . . . . . . . . . . . . . . . . 039 618 . . . PLUG, twistlock Arrow-Hart 9102N (RC2) (Eff w/HG006434)
. . . 31 . . . . . . . . . . . . . . . . . . . . . . . . . . . . KNOB, ball (included w/S5 – Figure 10-10) . . . . . . . . . . . . . . . . . . . . . . . 1
. . . 32 . . . . . . . . . . . . . . . . . 097 926 . . . KNOB, pointer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
. . . 33 . . . . . . . . . . . . . . . . . . . . . . . . . . . . KNOB, ball (included w/S4 – Figure 10-9) . . . . . . . . . . . . . . . . . . . . . . . . 1

+When ordering a component originally displaying a precautionary label, the label should also be ordered.
BE SURE TO PROVIDE MODEL AND SERIAL NUMBER WHEN ORDERING REPLACEMENT PARTS.

Dialarc HF, HF-P TM-315 Page 41

 Figure 10-5

2 3 4 5 6 7

1 1

8
9

31 10

Includes
Item 14
Figure 10-11
11
12

13

30

15
29 16
17

14 18

19

20 18

21
22
28
23
24
25 20

27

26
ST-070 307-D

Figure 10-4. Panel, Front w/Components (Eff w/JB510828)

TM-315 Page 42 Dialarc HF, HF-P

 Item Dia. Part
No. Mkgs. No. Description Quantity
Figure 10-4. Panel, Front w/Components (Eff w/JB510828)
(Figure 10-1 Item 25)

. . . 1 . . CB1,2 . . 083 432 . . . CIRCUIT BREAKER, man reset 10A 250V . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

. . . 2 . . . . . . . . . . . 010 296 . . . FITTING, hose brs elbow M 1/4NPT x .625-18RH . . . . . . . . . . . . . . . . . . . . . . 2
. . . 3 . . . GS1 . . 003 538 . . . VALVE, 115VAC 2 way 1/4 IPS port 1/8 orf . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
. . . 4 . . . . . . . . . . . 070 194 . . . PANEL, front (Prior to JF955186) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
. . . 4 . . . . . . . . . . . 106 580 . . . PANEL, front (Eff w/JF955186 thru JK674520) . . . . . . . . . . . . . . . . . . . . . . . . . 1
. . . 4 . . . . . . . . . . . 125 525 . . . PANEL, front (Eff w/JK674521 and on) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
. . . 5 . . . . S5 . . . 070 199 . . . SWITCH, plrt (Figure 10-5) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
. . . 6 . . . . S4 . . . 070 200 . . . SWITCH, range (Figure 10-5) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
. . . 7 . . . . R1 . . . 083 671 . . . RHEOSTAT, WW 150W 15 ohm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
. . . 8 . . . S2,3 . . . 011 609 . . . SWITCH, tgl SPDT 15A 125V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
. . . 9 . . . . S6 . . . . 011 610 . . . SWITCH, tgl SPDT 10A 125V center off . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
. . . 10 . . . . S1 . . . 045 834 . . . SWITCH, tgl DPST 60A 600VAC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
. . . 11 . . . TD1 . . . 052 192 . . . TIMER, 0-60 sec (consisting of) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
. . . 12 . . . . . . . . . . . 044 723 . . . . CIRCUIT CARD, postflow (Figure 10-11) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
. . . 13 . . . . . . . . . . . 039 449 . . . . BRACKET, mtg circuit card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
. . . 14 . . . . . . . . . . . 052 370 . . . . KNOB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
. . . 15 . . . RC1 . . 039 607 . . . RECEPTACLE, twlk 3P3W 20A 250V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
. . . . . . . . . . . . . . . . . 605 797 . . . PLUG, twlk 3P3W 20A 125V Arrow Hart 6312
. . . 16 . . . RC2 . . 039 602 . . . RECEPTACLE, twlk 2P2W 20A 250V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
. . . . . . . . . . . . . . . . . 039 618 . . . PLUG, twlk 2P2W 20A 250V Arrow Hart 9102N
. . . 17 . . C11,12 . 080 894 . . . CAPACITOR, cer disc .01uf 1000VDC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
. . . 18 . . . . . . . . . . ♦010 295 . . . FITTING, pipe brs elbow M 1/4NPT x .625-18 LH . . . . . . . . . . . . . . . . . . . . . . 2
. . . 19 . . . WS1 . ♦003 538 . . . VALVE, 115VAC 2 way 1/4 IPS port 1/8 orf . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
. . . 20 . . . . . . . . . . . 039 047 . . . TERMINAL, pwr output red (consisting of) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
. . . 21 . . . . . . . . . . . 601 976 . . . . SCREW, hex hd .500-13 x 1.500 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
. . . 22 . . . . . . . . . . . 039 049 . . . . TERMINAL BOARD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
. . . 23 . . . . . . . . . . . 601 880 . . . . NUT, hex jam .500-13 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
. . . 24 . . . . . . . . . . . 039 044 . . . . BUS BAR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
. . . 25 . . . . . . . . . . . 601 879 . . . . NUT, hex full .500-13 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
. . . 26 . . . . . . . . . . . 605 583 . . . CATCH, spring loaded door . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
. . . 27 . . . . . . . . . . . 134 327 . . . LABEL, warning general precautionary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
. . . 28 . . . . . . . . . . . 070 202 . . . DOOR, access front lower (Prior to KA882881) . . . . . . . . . . . . . . . . . . . . . . . . 1
. . . 28 . . . . . . . . . . . 138 250 . . . DOOR, access front lower (Eff w/KA882881) . . . . . . . . . . . . . . . . . . . . . . . . . . 1
. . . 29 . . . . . . . . . . . 097 926 . . . KNOB, pointer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
. . . 30 . . . . . . . . . . . . . . . . . . . . . . . NAMEPLATE, (order by model and serial number) . . . . . . . . . . . . . . . . . . . . . 1
. . . 31 . . . RC3 . . 604 176 . . . RECEPTACLE, str dx grd 2P3W 15A 125V . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
. . . . . . . . . . . . . . . . . 073 690 . . . PLUG, str grd armd 2P3W 15A 125V

♦OPTIONAL
BE SURE TO PROVIDE MODEL AND SERIAL NUMBER WHEN ORDERING REPLACEMENT PARTS.

Dialarc HF, HF-P TM-315 Page 43

 Item Part
No. No. Description Quantity

Figure 10-5. Switch, Polarity & Range (Figure 10-4 Item 5 & 6) 070 199 070 200

... 1 .... 011 645 . . CONTACT ASSEMBLY, movable (consisting of) . . . . . . . . . . . . . . . . . . . . . . . . 2 ..... 1
... 2 .... 011 074 . . . . SPRING, pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 ..... 1
... 3 .... 011 953 . . . . CONTACT, switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 ..... 2
... 4 .... 011 075 . . . . SPRING, pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 ..... 1
... 5 .... 011 644 . . CONTACT, stat switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 ..... 3
... 6 .... 070 204 . . BUS BAR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
... 7 .... 072 028 . . GUIDE, contact switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 ..... 1
... 8 .... 072 026 . . BRACKET, mtg switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 ..... 1
... 9 .... 005 558 . . SPRING, selector switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 ..... 1
... 10 . . . . 072 027 . . LEVER, switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 ..... 1
... 11 . . . . 072 082 . . BUSHING, stl .265 x .484 OD x .593 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 ..... 1

2 1
5
3

11
8
10

ST-070 308-A

Figure 10-5. Switch, Polarity & Range

BE SURE TO PROVIDE MODEL AND SERIAL NUMBER WHEN ORDERING REPLACEMENT PARTS.
TM-315 Page 44 Dialarc HF, HF-P
 Item Part
No. No. Description Quantity

034 587 Figure 10-6. Terminal Assembly, Pri (Figure 10-1 Item 21)

... 1 .... 601 835 .. NUT, brs hex 10-32 reg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

... 2 .... 601 836 .. NUT, brs hex .250-20 jam . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
... 3 .... 010 915 .. WASHER, flat brs .250 ID x .625 OD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
... 4 .... 083 426 .. TERMINAL BOARD, pri . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
.......... 026 631 .. INSULATION, (Prior to JC593572) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
... 5 .... 038 888 .. STUD, brs .250-20 x 1.500 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
... 6 .... 010 913 .. WASHER, flat brs .218 ID x .460 OD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
... 7 .... 038 887 .. STUD, brs 10-32 x 1.375 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
... 8 .... 038 618 .. LINK, jumper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

2 3 4
5 6
1
2 3 4

5 7
3 1
2 8
9

7
6
1

8
ST-087 333-B

Figure 10-6. Terminal Assembly, Pri Figure 10-7. Mounting Board, w/Components

Item Dia. Part

No. Mkgs. No. Description Quantity

Figure 10-7. Mounting Board, w/Components (Figure 10-1 Item 6)

... 1 ........... 006 208 ... MOUNTING BOARD, cmpnt elect . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

... 2 ........... 605 741 ... CLIP, mtg resistor .312 ID . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
... 3 . . . . R3 . . . 030 617 ... RESISTOR, WW adj 25W 2K ohm (Prior to HF857570) . . . . . . . . . . . . . . . . . 1
... 3 . . . . R3 . . . 030 601 ... RESISTOR, WW adj 25W 1000 ohm (Eff w/HF857570) . . . . . . . . . . . . . . . . . 1
... 4 . . . SR3 . . . 084 229 ... RECTIFIER, (Prior to HK326427) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
... 4 . . . SR3 . . . 035 704 ... RECTIFIER, integ 40A 800V (Eff w/HK326427) . . . . . . . . . . . . . . . . . . . . . . . . 1
... 5 . . . C10 . . . 046 139 ... CAPACITOR, (Eff w/HK326427) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
... 6 . . . . C9 . . . 046 140 ... CAPACITOR, (Eff w/HK326427) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
... 7 . . . CR1 . . 120 891 ... RELAY, (Prior to HK326427) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
... 7 . . . CR1 . . 059 267 ... RELAY, encl 12VDC DPDT 10A/120VAC (Eff w/HK326427) . . . . . . . . . . . . . . 1
... 8 . . . CR2 . . 106 904 ... RELAY, kit (Prior to HK326427) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
... 8 . . . CR2 . . 059 266 ... RELAY, encl 120VAC DPDT 10A/120VAC (Eff w/HK326427) . . . . . . . . . . . . . 1
... 9 . . . CR3 . . 106 902 ... RELAY, kit (Prior to HK326427) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
... 9 . . . CR3 . . 006 393 ... RELAY, 24VAC DPDT 10A/120VAC (Eff w/HK326427) . . . . . . . . . . . . . . . . . . 1

BE SURE TO PROVIDE MODEL AND SERIAL NUMBER WHEN ORDERING REPLACEMENT PARTS.
Dialarc HF, HF-P TM-315 Page 45
 Item Dia. Part
No. Mkgs. No. Description Quantity

Figure 10-8. HF Panel (Figure 10-1 Item 23)

... 1 ........... 081 291 . . . CAPACITOR, HF (Prior to KD423430) (consisting of) . . . . . . . . . . . . . . . . . . . 1

................. 600 760 . . . . TERMINAL, frict .250 x .032 male .130 stud . . . . . . . . . . . . . . . . . . . . . . . . . 2
. . . . . . . . . . C3 . . . 059 887 . . . . CAPACITOR, MF 10uf 220V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
................. 007 532 . . . . CLAMP, capacitor 1.000 dia . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
................. 081 282 . . . . STRIP, mtg capacitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
. . . 1 . . . . C3 . . . 106 935 . . . CAPACITOR, polyp film 10uf 250VAC (Eff w/KD423430 and on) . . . . . . . . . 1
... 2 ........... 000 684 . . . MOUNTING BOARD, (Prior to JF837638) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
... 2 ........... 070 201 . . . MOUNTING BOARD, (Eff w/JF837638) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
... 3 ........... 605 742 . . . CLIP, mtg resistor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
. . . 4 . . . . R6 . . . 030 965 . . . RESISTOR, WW fxd 100W 100 ohm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
. . . 5 . . . . T2 . . . 074 398 . . . TRANSFORMER, 115V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
... 6 ........... 000 681 . . . STRIP, mtg coil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
. . . 7 . . . . T3 . . . 039 177 . . . COIL, coupling air . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
... 8 ........... 000 682 . . . TUBING, fbr vulc .250 ID x .312 OD x .812 . . . . . . . . . . . . . . . . . . . . . . . . . . 2
. . . 9 . . . . R4 . . . 083 784 . . . RESISTOR, WW fxd 100W 10 ohm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
. . . 10 . . . . . . . . . . . 020 623 . . . SPARK GAP ASSEMBLY, (consisting of) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
. . . 11 . . . . . . . . . . . 095 621 . . . . BASE, spark gap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
. . . 12 . . . . . . . . . . . 020 622 . . . . HOLDER, points . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
. . . 13 . . . . G . . . . *020 603 . . . . POINT, spark gap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
. . . 14 . . . . . . . . . . . 000 914 . . . LINK, connecting HF (Prior to JH173332) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
. . . 14 . . . . . . . . . . . 025 065 . . . STRIP, conductor (Eff w/JH173332) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
. . . 15 . . . . C2 . . . 096 761 . . . CAPACITOR, mica .002uf 10000V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
. . . 16 . . . . R5 . . . 080 929 . . . RESISTOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

3
16 4

2
1* 5
1

16

15

8 7
3

14

13
12 9

10
11
*Prior to KD423430 Ref. ST-000 890-D

Figure 10-8. HF Panel

*Recommended Spare Parts.
BE SURE TO PROVIDE MODEL AND SERIAL NUMBER WHEN ORDERING REPLACEMENT PARTS.
TM-315 Page 46 Dialarc HF, HF-P
 Item Part
No. No. Description Quantity

000 071 Figure 10-9. Switch, Range (Prior to JB510828) (Figure 10-3 Item 5)

... 1 .... 011 839 . . BRACKET, mtg support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

... 2 .... 011 840 . . BRACKET, mtg switch (consisting of) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
... 3 .... 010 671 . . . . SPRING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
... 4 .... 000 530 . . CONTACT BOARD ASSEMBLY, (consisting of) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
... 5 .... 011 968 . . . . CONTACT BOARD, stationary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
... 6 .... 011 969 . . . . CONTACT BOARD, movable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
... 7 .... 011 644 . . . . CONTACT, stationary switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
... 8 .... 011 645 . . . . CONTACT ASSEMBLY, movable (consisting of) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
... 9 .... 011 953 . . . . . . CONTACT, switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
... 10 . . . . 011 074 . . . . . . SPRING, pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
... 11 . . . . 011 075 . . . . . . SPRING, pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
... 12 . . . . 100 622 . . . . SHIM, guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
... 13 . . . . 100 623 . . . . GUIDE, contact . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
... 14 . . . . 011 841 . . HANDLE, switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
... 15 . . . . 019 603 . . KNOB, ball . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
... 16 . . . . 014 203 . . BAR, mtg support switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

SN-000 961

Figure 10-9. Switch, Range (Prior to JB510828)

BE SURE TO PROVIDE MODEL AND SERIAL NUMBER WHEN ORDERING REPLACEMENT PARTS.

Dialarc HF, HF-P TM-315 Page 47

 Item Part
No. No. Description Quantity

000 070 Figure 10-10. Switch, Selector (Prior to JB510828) (Figure 10-3 Item 13)

... 1 .... 000 531 . . CONTACT BOARD ASSEMBLY, (consisting of) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

... 2 .... 011 968 . . . . CONTACT BOARD, stationary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
... 3 .... 100 623 . . . . GUIDE, contact . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
... 4 .... 100 622 . . . . SHIM, guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
... 5 .... 011 969 . . . . CONTACT BOARD, movable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
... 6 .... 011 645 . . . . CONTACT ASSEMBLY, movable (consisting of) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
... 7 .... 011 075 . . . . . . SPRING, pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
... 8 .... 011 953 . . . . . . CONTACT, switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
... 9 .... 011 074 . . . . . . SPRING, pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
... 10 . . . . 011 644 . . . . CONTACT, stationary switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
... 11 . . . . 100 621 . . . . LINK, connecting switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
... 12 . . . . 011 841 . . HANDLE, switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
... 13 . . . . 011 840 . . BRACKET, mtg switch (consisting of) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
... 14 . . . . 010 671 . . . . SPRING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
... 15 . . . . 014 203 . . BAR, mtg support switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
... 16 . . . . 011 839 . . BRACKET, mtg support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
... 17 . . . . 019 603 . . KNOB, ball . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

SN-000 962

Figure 10-10. Switch, Selector (Prior to JB510828)

BE SURE TO PROVIDE MODEL AND SERIAL NUMBER WHEN ORDERING REPLACEMENT PARTS.

TM-315 Page 48 Dialarc HF, HF-P

 Dia. Part
Mkgs. No. Description Quantity

044 723 Figure 10-11. Circuit Card, Postflow Timer (Figure 10-4 Item 12)

. . . . A50 . . . . . 008 971 .. IC, linear 741 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

. . . C50,51 . . . 039 482 .. CAPACITOR, elctlt 100uf 35VDC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
. . . . C52 . . . . . 039 481 .. CAPACITOR, elctlt 3.3uf 50VDC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
. . . . C53 . . . . . 031 677 .. CAPACITOR, tantlm 5.6uf 35VDC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
. . . . C54 . . . . . 031 670 .. CAPACITOR, cer disc .05uf 500VDC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
. . . CR50 . . . . 039 486 .. RELAY, encl 24VDC SPDT 2.5A/115VAC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
. . . D50,51 . . . 026 202 .. DIODE, rect 1A 400V SP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
. . . . Q50 . . . . . 000 088 .. TRANSISTOR, NPN 800mA 40V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
. . . . R50 . . . . . 074 121 .. RESISTOR, C 2W 3.3K ohm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
. . . . R51 . . . . . 059 954 .. POTENTIOMETER, C sltd sft 1/T .50W 600K ohm . . . . . . . . . . . . . . . . . . . . . . . . . 1
. . . . R52 . . . . . 035 888 .. RESISTOR, CF .25W 2.2K ohm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
. . . . R53 . . . . . 000 342 .. POTENTIOMETER, cermet trmr 1/T .5W 5K ohm . . . . . . . . . . . . . . . . . . . . . . . . . . 1
. . . . R54 . . . . . 039 332 .. RESISTOR, CF .25W 15K ohm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
. . . . R55 . . . . . 030 997 .. RESISTOR, C .5W 2.7K ohm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
. . . . R56 . . . . . 039 335 .. RESISTOR, CF .25W 47K ohm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
. . . . R57 . . . . . 605 919 .. RESISTOR, C .25W 47 ohm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

SN-121 992-B

Figure 10-11. Circuit Card, Postflow Timer

BE SURE TO PROVIDE MODEL AND SERIAL NUMBER WHEN ORDERING REPLACEMENT PARTS.

Dialarc HF, HF-P TM-315 Page 49