YCC-IOM-1L

INSTALLATION 18-EB21D1-11
OPERATION Library
Product Section
Product
Service Literature
Unitary
Packaged Gas/Electric

MAINTENANCE Model
Literature Type
Sequence
YCC
Installation, Operation, Maintenance
1I
ALL phases of this installation must comply with Date November 2003
NATIONAL, STATE AND LOCAL CODES File No. SV-UN-RT-YCC-IOM-1I 11/03
Supercedes YCC-IOM-1H

Model:
YCC018F-L YCC036F-H YCC036F-M Package Convertible
YCC024F-L YCC042F-M
YCC030F-L YCC048F-M Gas/Electric
YCC030F-M YCC048F-H
YCC036F-L YCC060F-M BAYLIFT002A Lifting Lug Kit 1-1/2 - 5 Ton
IMPORTANT — This Document is customer property and is to remain with this unit. Please return to service information pack upon completion of work.

WARNING: HAZARDOUS VOLTAGE - DISCONNECT POWER BEFORE SERVICING

All phases of this installation must comply with the NATIONAL, STATE & LOCAL CODES. In the absence of local codes, the
installation must conform with National Electric Code -- ANSI/NFPA 70 or "LATEST REVISION."

Since Trane has a policy of continuous product and product data improvement,
it reserves the right to change design and specification without notice.

© 2003 American Standard Inc. All rights reserved Dwg. No. X664209 P01
10/03
 GENERAL INFORMATION
IMPORTANT: Read this entire manual before IMPORTANT: DO NOT CONNECT GAS PIPING TO THE UNIT
beginning installation procedures. UNTIL A LINE PRESSURE TEST HAS BEEN COMPLETED.

▲ WARNING: BODILY INJURY CAN RESULT FROM

HIGH VOLTAGE ELECTRICAL COMPONENTS, FAST MOVING FANS,
DAMAGE TO THE GAS VALVE MAY RESULT IN AN UNSAFE
CONDITION. THIS UNIT SHOULD NEVER BE EXPOSED TO
GAS LINE PRESSURE IN EXCESS OF 14 INCHES WATER
AND COMBUSTIBLE GAS. FOR PROTECTION FROM THESE COLUMN. (1/2 PSIG)
INHERENT HAZARDS DURING INSTALLATION AND SERVICING,
THE ELECTRICAL SUPPLY MUST BE DISCONNECTED AND THE
MAIN GAS VALVE MUST BE TURNED OFF. IF OPERATING CHECKS IMPORTANT: RECONNECT ALL GROUNDING DEVICES.
MUST BE PERFORMED WITH THE UNIT OPERATING, IT IS THE ALL PARTS OF THIS PRODUCT CAPABLE OF CONDUCTING
TECHNICIANS RESPONSIBILTY TO RECOGNIZE THESE HAZARDS ELECTRICAL CURRENT ARE GROUNDED. IF GROUNDING
AND PROCEED SAFELY. WIRES, SCREWS, STRAPS, CLIPS NUTS OR WASHERS
USED TO COMPLETE A PATH TO GROUND ARE REMOVED
Read this manual carefully before attempting to install, operate, FOR SERVICE, THEY MUST BE RETURNED TO THEIR ORIGI-
or perform maintenance on this unit. Installation and mainte- NAL POSITION AND PROPERLY FASTENED.
nance should be performed by qualified service technicians
only. IMPORTANT: ALL POWER LEGS MAY NOT BE BROKEN BY
CONTACTORS. SEE WIRING DIAGRAM ON UNIT CONTROL
As shipped from the factory, this unit is for use with natural gas BOX COVER.
only, and is listed by Underwriters Laboratory. THIS UNIT, AS SHIPPED FROM THE FACTORY, IS DE-
SIGNED FOR NATURAL GAS ONLY.
Model YCP-F heating/cooling units are designed for outdoor
mounting with a vertical condenser discharge. They can be BEFORE STARTING THE COMPRESSOR, THE CRANKCASE
located either at ground level or on a roof, in accordance with HEATER SHOULD BE ENERGIZED FOR EIGHT HOURS
local codes or National Fuel Gas Code (ANSI-Z223.1A) Latest
Revision. Since these units are designed exclusively for outdoor
operation, additional flue venting systems are not required.
Each unit contains an operating charge of Refrigerant-22 as
shipped.

INSPECTION
1. Check for damage after the unit is unloaded. Report promptly,
to the carrier, any damage found to the unit. Do not drop the
unit.

IMPORTANT: The use of “spreader bars” is required

when hoisting the unit (to prevent damage to sides and
top).
The following warning complies with State of California law, Proposition 65.
2. Check the unit’s nameplate to determine if the unit is correct
for the intended application. The power supply must be
adequate for both the unit and all accessories. ▲WARNING: Hazardous Gasses!
Exposure to fuel substances or by-products of incomplete
3. Check to be sure the refrigerant charge has been retained fuel combustion is believed by the state of California to
during shipment. Access to 1/4" flare pressure taps may be cause cancer, birth defects, or other reproductive harm.
gained by removing the furnace compartment access panel.

NOTICE
Warnings and Cautions appear at appropriate locations throughout this manual.
Read these carefully.

▲ WARNING: Indicates a potentially hazardous situation which, if not avoided, could

result in death or serious injury.

▲ CAUTION: Indicates a potentially hazardous situation which, if not avoided, may

result in minor or moderate injury. It may also be used to alert against unsafe practices
and where property-damage-only accidents could occur.

Page 2 Dwg. No. X664209 P01

 1 TYPICAL ROOFTOP INSTALLATION WITH FULL PERIMETER CURBS
(YCC018-036F-L/M Models on BAYCURB030/38A)

FIELD SUPPLIED
SUPPORTS
AT EACH END
OF CURB

ROOFING
ROOF INSULATION
FIELD SUPPLIED
CANT STRIP
ROOF DECK

FIELD SUPPLIED
RIGID INSULATION

ROOF MOUNTING
CURB

SUPPLY AIR
DUCT RETURN AIR
DUCT

2 TYPICAL ROOFTOP INSTALLATION WITH BAYCURB030/38A

(YCC042,048F-M;YCC036F-H;YCC048F-H;YCC060F-M)

SEE NOTE 1

SEE NOTE 2

FIELD SUPPLIED
SUPPORTS
AT EACH END
OF CURB

ROOFING
ROOF INSULATION

FIELD SUPPLIED
CANT STRIP
ROOF DECK

FIELD SUPPLIED
RIGID INSULATION

ROOF MOUNTING
CURB
NOTES:
1. The YCC042,048F-M:YCC036F-H models extend SUPPLY AIR
out past this end of the curb ONLY. DUCT RETURN AIR
DUCT
2. Only the YCC048F-H,060F models extend past both
the end and the side of the curb as illustrated.

Dwg. No. X664209 P01 Page 3

 DIMENSIONAL DATA

3 YCC018-060F OUTLINE –REAR

CORNER WEIGHT (LBS) UNIT

MODEL A B C D E F G H J K L M N P
W1 W2 W3 W4 WEIGHT
YCC018F-L 68.3 61.7 84 92.9 307
YCC024F-L 69.4 60.0 85 99.5 314 55-1/4 36 25-3/16 18-9/16 11-1/16 6-9/16 6-13/16 17 21-5/16 25 17-1/2 10 3 4-7/16
YCC030F-L 70.5 61.4 87 99.8 319
YCC030F-M 84.06 68.08 92.1 113.7 358 20-3/4 25-13/16
YCC036F-L 78.3 68.3 95.6 109.7 352 55-1/4 36 29-3/16 18-9/16 11-1/16 6-9/16 6-13/16 17 17-1/2 10 3 4-7/16
19-3/4 24-13/16
YCC036F-M 86 67.6 93.2 115.13 364
YCC036F-H 90.3 73.8 101 123.7 399
YCC042F-M 103.8 88.7 98.6 122.6 412 62-3/4 36 29-3/16 18-9/16 11-1/16 6-9/16 11-1/8 17 19-3/4 28-1/4 17-1/2 10 3 8-3/4
YCC048F-M 104.6 84.6 102.2 126.4 418
YCC048F-H 123.8 104.6 132.5 157 518
65-5/16 45 33-3/8 21-1/16 15-1/16 4-15/16 9-1/8 21-15/16 25 29-7/32 20 14 3-1/2 8-5/16
YCC060F-M 135.4 109.8 137.3 169.3 552

Page 4 Dwg. No. X664209 P01

 DIMENSIONAL DATA

4 YCC018-060F OUTLINE – FRONT

RECOMMENDED SERVICE
CLEARANCE
BACK * 6.0" CLEARANCE TO
COMBUSTIBLE MATERIAL
LEFT SIDE 30.0"
BOTTOM 0.0"
RIGHT SIDE 24.0"
BACK 1.0"
FRONT 42.0"
LEFT SIDE 6.0"
* 18" WITH FRESH AIR ACCESSORY
* 30" WITH ECONOMIZER RIGHT SIDE 6.0"
FRONT SIDE 12.0"
TOP 36.0"

MODEL A B C D E F
YCC018F-L
KNOCKOUTS FOR 1/2" AND 1"
YCC024F-L 55-1/4 36 25-3/16 12-15/16 36-3/4
CONDUIT
YCC030F-L
YCC030F-M
KNOCKOUTS FOR 3/4" AND 1-1/4"
YCC036F-L 55-1/4 36 29-3/16 12-15/16 36-3/4
CONDUIT
YCC036F-M
YCC036F-H
KNOCKOUTS FOR 3/4" AND 1-1/4"
YCC042F-M 62-3/4 36 29-3/16 14-1/2 27-1/2
CONDUIT
YCC048F-M
YCC048F-H KNOCKOUTS FOR 3/4" AND 1-1/2"
64-5/16 45 33-3/8 14-13/16 27-15/16
YCC060F-M CONDUIT

Dwg. No. X664209 P01 Page 5

 5 CONVERTING HORIZONTAL TO DOWNFLOW

HEATER EXCHANGER
TUBES

NOTE

SUPPLY OPENING

1. REMOVE SCREW NEAREST TO THE

OPENING AND PULL THE PANEL FIRMLY
TOWARD THE OUTSIDE OF THE UNIT TO
DISENGAGE THE BACK ATTACHMENT.

RETURN OPENING

2. REMOVE RIGHT HAND SCREW AND

MOVE PANEL TO THE RIGHT OR RE-
SHEET METAL HORIZONTAL RETURN MOVE BOTH SCREWS.
SCREWS AIR COVER
HORIZONTAL SUPPLY
AIR COVER

REQUIRED CLEARANCE FOR UNIT INSTALLATION

6 AND ROOF PENETRATION HOLE SIZE REQUIRED

D
A

SERVICE SERVICE
CLEARANCE CLEARANCE
LINES LINES
SUPPLY AIR

C RETURN AIR B
SIDE RAIL

WOOD NAILER

SERVICE CLEARANCE & PENETRATION DIMENSIONS

MODEL NO. A B C D E F HOLE IN ROOF
YCCO18-036F-L 30" 30" *6" 24" 36" 25"
YCC030-036F-M,F-H
30" 30" *12" 30" 44" 25"
YCC042-048F-M
E
YCC048F-H, 060F-M 42" 30" *12" 36" 50" 25" F
* 18" WITH FRESH AIR ACCESSORY
* 30" WITH ECONOMIZER

Page 6 Dwg. No. X664209 P01

 LOCATIONS AND RECOMMENDATIONS
HORIZONTAL AIRFLOW APPLICATION
3. See the unit’s nameplate for the absolute minimum clearance
1. These units are design certified for outdoor installations. These between the unit and any combustible surface(s).
units may be installed directly on wood flooring or on Class A,
Class B, or Class C roof covering material. The discharge air IMPORTANT:
from the condenser fans must be unrestricted for a minimum of
3 feet above the unit. 1. Remove the Flue and Air Inlet Hood with gasket from the return
air section of the unit.
NOTE: The unit is shipped for horizontal installation.
The screws that attach the flue and air inlet hood will be installed
The Air Inlet Hood in the combustion blower access panel must in their proper location at the factory. Therefore, they must be
have adequate clearance around the air opening into the removed and then used to attach the flue and the air inlet hood.
combustion area. See Outline Drawing, Figure 4.
2. Remove the packaging material from the components and
Examine all flue product-carrying areas of the furnace, its vent secure the Flue and Air Inlet Hood with the gasket to the unit
system, and the main burner for safe operation. A periodic with sheet metal screws as illustrated in Figure 5. See “Firing
inspection of the furnace should be made by a qualified service Rate Selection” section for additional information.
agency at the start of each heating season.
NOTE: Outdoor air or other requirements during heating
Replacement parts list for this Gas/Electric Air Conditioner, may be operation that result in supply air temperatures below 80
obtained by contacting your local manufacturer representative. degrees F or return air temperatures below 50 degrees F may
cause flue gas condensate to form and is to be avoided.
NOTE: If any internal accessories are to be added to the unit,
install them at the shop if at all practical. DOWNFLOW APPLICATION -- CURB MOUNTING

2. Location of the unit must allow service clearance around it. 1. The Roof Mounting Curb, (field assembled
Clearance of the unit must be given careful consideration. See BAYCURB030,038,033,034A), or a field fabricated curb must
Figure 6. be in place before the unit is hoisted to the roof top.

IMPORTANT: Air outlet duct must have 1" clearance to 2. The Roof Mounting Curb (frame) must be installed on a flat,
combustible material downstream from the unit. level section of the roof (maximum of 1/4" per foot pitch)
and provide a level mounting surface for the unit. In
3. Check the handling facilities to ensure the safety of personnel addition, be sure to provide sufficient height above the roof
and the unit(s). to prevent water from entering the unit.

4. CAUTION MUST BE TAKEN AT ALL TIMES TO AVOID NOTE: This unit was shipped for horizontal installation. Con-
PERSONAL INJURIES AND/OR DAMAGE TO EQUIPMENT vert to downflow per instructions:

5. The unit must be mounted level for proper drainage of water Remove covers from the downflow supply and return air open-
through the holes in the base pan. ings and place them over the horizontal supply return air
openings (painted side out) and secure with sheet metal screws.
6. The unit must not be exposed to direct roof water runoff. See Figure 5.

7. Flexible duct connectors must be of a flame retardant material. 3. Be sure the mounting curb spans structural members (trusses)
All duct work outside of the structure must be insulated and of the roof, thereby providing sufficient support for the weight of
weatherproofed in accordance with local codes. the unit, the curb, the duct(s), and any factory or field installed
accessories. See Figures 1, 2, 9, 10, and 11.
8. Holes through exterior walls must be sealed in accordance with
local codes. 4. Be sure the hole in the structure for the ducts is large enough
to accommodate the fabricated ducts and the insulation sur-
9. All fabricated outdoor ducts should be as short as possible. rounding them. See Figure 6.

CLEARANCES Note: If any internal accessories are to be added to the unit,

install them at the shop if at all practical.
1. The recommended clearances for single-unit installations are
illustrated in Figures 4 and 6. These minimum requirements are 5. These units are design certified for outdoor installation. These
not only an important consideration when determining unit units may be installed directly on wood flooring or on Class A,
placement, but they are also essential to ensure adequate Class B, or Class C roof covering material. The discharge air
serviceability, maximum capacity, and peak operating effi- from the condenser fans must be unrestricted for a minimum of
ciency. 3 feet above the unit.

2. Any reduction of the unit clearances indicated in these illustra- The air inlet hood in the combustion blower access panel must
tions may result in condenser coil starvation or the recirculation have adequate clearance around air openings into the combus-
of warm condenser air. Actual clearances which appear to be tion area. See Outline Drawing, Figure 4. continued on next page
inadequate should be reviewed with a local engineer.
Dwg. No. X664209 P01 Page 7
 LOCATIONS AND RECOMMENDATIONS
continued from page 7 15. Access and service clearances for the unit must be given
careful consideration when locating the duct entrance open-
Examine all flue product-carrying areas of the furnace, its vent ings. Figure 4 provides unit dimensions.
system, and the main burner for safe operation. A periodic
inspection of the furnace should be made at the start of each 16. All fabricated outdoor ducts should be as short as possible.
heating season.
CLEARANCES
Replacement parts list for this Gas/Electric Air Conditioner may
be obtained by contacting your local manufacturer representa- 1. The recommended clearances for single-unit installations are
tive. illustrated in Figures 4 and 6. These minimum requirements are
not only an important consideration when determining unit
6. Location of the unit must allow for service clearance around it. placement, but they are also essential to ensure adequate
Clearance of the unit must be given careful consideration. See serviceability, maximum capacity, and peak operating effi-
Figure 4. ciency.

7. IMPORTANT: Air outlet duct must have one (1) inch clear- 2. Any reduction of the unit clearances indicated in these illustra-
ance to combustible material downstream from the unit. tions may result in condenser coil starvation or the recirculation
of warm condenser air. Actual clearances which appear to be
8. Exhaust vents or other sources of contaminated air should not inadequate should be reviewed with a local sales engineer.
be near the unit’s air inlet, if outside air is to be introduced as
make-up air or a ventilation feature is to be used. IMPORTANT:

9. Check the handling facilities to ensure the safety of personnel 1. Remove the Flue and Air Inlet Hood with the gasket from the
and the unit(s). return air section of the unit.

10. Caution must be taken at all times to avoid personal The screws that attach the flue and air inlet hood will be installed
injuries and/or damage to the equipment. in their proper location at the factory. Therefore, they must be
removed and then used to attach the flue and air inlet hood.
11. The unit must be mounted level for proper drainage of water
through the holes in the base pan. 2. Remove the packaging material from the components and
secure the Flue and Air Inlet Hood with the gasket to the unit
12. The unit must not be exposed to direct roof water runoff. with sheet metal screws as illustrated in Figure 16 on page 14.

13. Flexible duct connectors must be of a flame retardant material. NOTE: Outdoor air or other requirements during heating
All duct work outside of the structure must be insulated and operation that result in supply air temperatures below 80
weatherproofed in accordance with local codes. degrees F or return air temperatures below 50 degrees F may
cause flue gas condensate to form and is to be avoided.
14. Roof flashing must be installed to seal the roof curb cavity and
must conform to local building codes.

INSTALLATION
UNIT SUPPORT PLACING AND RIGGING

If the unit is to be roof mounted, check the appropriate building 1. Before preparing the unit for lifting, check the outline drawing for
codes for weight distribution requirements. Refer to the applicable center of gravity for lifting safety. Because of placement of
roof curb mounting instruction. Check the unit’s nameplate for internal components, the unit’s weight may be unevenly distrib-
supply voltage required. Determine if adequate electrical power is uted. Approximate unit weights are given in Figure 2, page 3.
available. The furnace may be installed on Class A, B, or C roofing
material. NOTE: Accessory BAYLIFT002AA, a kit of four (4) lifting lugs, is
required for rigging the unit for hoisting. See Figure 7, insert B.
LOCATION AND CLEARANCES
2. Insert the four lifting lugs in the openings provided in the drip lip
Installation of the unit should conform to local building codes or, in on the perimeter of the unit. See Figure 7, insert B. A tap or jerk
the absence of local codes, to the National Fuel Gas Code, to the lug will overcome the interference that arises due to the
ANSIZ223.1, Latest Revision, and the National Electrical Code. nipple on the lug.
Canadian installations must conform to CSA and local codes.
3. Before hoisting the unit, be sure that the proper method of
Select a location that will permit adequate combustion and ventila- rigging is used, with straps or slings and spreader bars for
tion air in accordance with Section 5.3, Air For Combustion and protection during lifting. Always test-lift the unit to determine the
Ventilation, of the National Fuel Gas Code, ANSIZ223.1, Latest exact unit balance and stability before hoisting it to the installa-
Revision, or applicable provisions of the local building code. tion location.

Page 8 Dwg. No. X664209 P01

 INSTALLATION
IMPORTANT: Do not lift the unit without test lifting for PLACING THE UNIT ON A MOUNTING CURB
balance and rigging. Do not lift the unit in windy conditions
or above personnel. Do not lift the unit by attaching a 1. The unit is designed with a perimeter drip lip that is lower that
clevis, hooks, pins, or bolts to the unit casing, casing the unit base bar, see Figure 7, inset A.
hardware, corner lugs, angles, tabs, or flanges. Failure to
observe these warnings may result in equipment damage. 2. Position the unit drip lip down over and in contact with the
outside corner of the curb, as illustrated in Figure 8, insert A.
4. When the curb and air ducts have been properly installed, the Continue to lower the unit on top of the curb, with the unit drip
unit is ready to be hoisted to the roof and set in position. lip astraddle and in contact with both the end and side rail of the
IMPORTANT: “Spreader Bars” must be used when hoist- curb. The unit should now rest on top of the curb.
ing the unit.
3. Take the two (2) hold-down brackets shipped with the curb and
5. IMPORTANT: The unit must be lowered into position. The secure the unit to the curb with hold-down brackets as illus-
P.V.C. rubber tape on the curb flange permits the unit to be trated in Figure 8, insert A.
repositioned if required without destroying the P.V.C. rub-
ber seals affixed to the mounting curb.

7
SPREADER BARS

OUTDOOR COIL
END OF UNIT

BASE OF UNIT DRIP LIP ON

REST ON TOP OF PERIMETER OF UNIT
CURB RAILS
“B”

UNIT CORNER

DRIP LIP

BAYLIFT002A
DIMPLE LIFTING LUGS

CURB CORNER

SEE DETAIL “A”

NOTE: GASKET SEAL
THE INNER PERIMETER OF THE DRIP LIP ON ALL UNITS
SHOULD BE FLUSH WITH THE OUTER PERIMETER OF THE
CURB ON THE TWO SIDES SHOWN HERE. SEE FIGURE 2 FOR
THE LOCATION OF THE UNIT OVERHANG ON THE
YCC018-060F MODELS.
“A”

EXISTING
SHEET METAL
SCREW
HOLD-DOWN
BRACKET WITH
“A” CURB

FLANGE OF
CURB

Dwg. No. X664209 P01 Page 9

 INSTALLATION
ROOFTOP -- UNITS 4. Place the unit on the frame or roof curb. Refer to Figures 9 or
10.
For roof top applications using a field fabricated frame and ducts,
use the following procedure: 5. Secure the unit to the frame or roof curb.

1. The frame must be located and secured by bolting or welding 6. Insulate any ductwork outside of the structure with at least two
to the roof. Flashing is required. (2) inches of insulation and then weatherproof. There must be
a weatherproof seal where the duct enters the structure.
2. The hole in the roof must be prepared in advance of installing
the unit. 7. Complete the installation according to the instructions in the
following sections of this manual.
3. Secure the ducts to the roof.

9 TYPICAL ROOFTOP APPLICATION WITH FRAME

(YCC018-060F)
RETURN AIR SUPPLY AIR

WEATHER-PROOF
DUCT FLUE

ROOF FLASHING INLET HOOD

ANGLE IRON
FRAME

0 TYPICAL ROOFTOP APPLICATION WITH FRAME

(YCC018-060F MODELS)

FLUE

INLET HOOD

WEATHER-PROOF ROOF FLASHING

DUCT

SUPPLY AIR

ROOF FLASHING

RETURN AIR ANGLE IRON

FRAME

Page 10 Dwg. No. X664209 P01

 INSTALLATION
GROUND LEVEL -- HORIZONTAL UNITS

For ground level installations, the unit should be positioned on a pad 2. Attach the supply and return air ducts to the unit.
the size of the unit or larger. The unit must be level on the pad. The
pad must not come in contact with the structure (See Figure 11.) Be 3. Insulate any ductwork outside of the structure with at least 2
sure the outdoor portion of the supply and return air ducts are as inches of insulation and weatherproof. There must be a weather-
short as possible. proof seal where the duct enters the structure.

Proceed with the installation as follows: 4. Complete the installation according to the instructions in the
following sections of this manual.
1. Place the unit on the pad and the five (5) rubber isolators
provided.

q TYPICAL GROUND LEVEL APPLICATION

(YCC018-060F MODELS)

OUTDOOR AIR
DISCHARGE

SUPPLY AIR
RETURN AIR DUCT
DUCT

SIDING

OUTDOOR AIR
INTAKE

FLUE

INLET HOOD

SUPPORT PAD
FOUNDATION
EXTERIOR
WALL

INSULATE ISOLATORS
WEATHERPROOF FLEXIBLE DUCT
CONNECTORS (1 PER CORNER
OR RAIN SHIELD AND 1 UNDER
UNIT CONTROL BOX)

CONDENSATE DRAIN PIPING

A 3/4-inch female NPT condensate drain connection is provided on
the evaporator access panel end of the unit. See Figure 4. Provide
a trap and fill it with water before starting the unit to avoid air from w TYPICAL CONDENSATE DRAIN PIPING
3/4"
being drawn through. Follow local codes and standard piping PVC OR COPPER
practices when running the drain line. Pitch the line downward away TUBING AND FITTINGS
from the unit. Avoid long horizontal runs. See Figure 12.

NOTE: Do not use reducing fittings in the drain lines. The

condensate drain must be: 1-1/2" MIN.
● Made of 3/4" pipe size.

● Pitched 1/4" per foot to provide free drainage to convenient drain

system.

● Trapped.

● Must not be connected to closed drain system.

Dwg. No. X664209 P01 Page 11
 DUCTWORK
ATTACHING DOWNFLOW DUCTWORK TO ROOF CURB ATTACHING HORIZONTAL DUCTWORK TO UNIT
Supply and return air flanges are provided on the roof curb for easy All conditioned air ductwork should be insulated to minimize heating
duct installation. All ductwork must be run and attached to the curb and cooling duct losses. Use a minimum of two (2) inches of
before the unit is set into place. insulation with a vapor barrier. The outside ductwork must be
weatherproofed between the unit and the building.
Follow these guidelines for ductwork construction:
When attaching ductwork to a horizontal unit, provide a flexible
Connections to the unit should be made with three-inch canvas watertight connection to prevent noise transmission from the unit to
connectors to minimize noise and vibration transmission. the ducts. The flexible connection must be indoors and made out
of heavy canvas.
Elbows with turning vanes or splitters are recommended to mini-
mize air noise and resistance. NOTE: Do not draw the canvas taut between the solid ducts.

The first elbow in the ductwork leaving the unit should be no closer
than two feet from the unit, to minimize noise and resistance.
AIR PROOF
THIS SEAM
UNIT BASE
UNIT EXTERIOR

WEATHERPROOF
FIELD DUCT THIS SEAM
UNIT DUCT
UNIT DUCT FLANGE FIELD DUCT
FLANGE

AIR PROOF
THIS SEAM

UNIT DUCT UNIT EXTERIOR

FLANGE UNIT BASE
FIELD DUCT UNIT DUCT FLANGE
WEATHERPROOF
AIR PROOF THIS SEAM
THIS SEAM
FIELD DUCT
UNIT BASE

FIELD
DUCT
UNIT DUCT FLANGE

UNIT BASE
UNIT EXTERIOR

WEATHERPROOF
UNIT DUCT THIS SEAM
FLANGE UNIT DUCT
WATERPROOF SEAM FLANGE FIELD DUCT
WITH BUTYL OR
SILICONE
NOT RECOMMENDED
FIELD DUCT
HORIZONTAL
DOWNFLOW
The following warning complies with State of California law, Proposition 65.

●
WARNING: This product contains Wash clothes separately from other clothing: rinse
washer thoroughly.
fiberglass wool insulation! Fiberglass dust and ceramic
fibers are believed by the State of California to cause ● Operations such as sawing, blowing, tear-out, and
cancer through inhalation. Glasswool fibers may also spraying may generate fiber concentrations requiring
cause respiratory, skin, or eye irritation. additional respiratory protection. Use the appropriate
NIOSH approved respirator in these situations.
PRECAUTIONARY MEASURES
FIRST AID MEASURES
● Avoid breathing fiberglass dust.
Eye Contact - Flush eyes with water to remove dust.
● Use a NIOSH approved dust/mist respirator. If symptoms persist, seek medical
attention.
● Avoid contact with the skin or eyes. Wear long-
sleeved, loose-fitting clothing, gloves, and eye Skin Contact - Wash affected areas gently with soap
protection. and warm water after handling.

Page 12 Dwg. No. X664209 P01

 GAS PIPING INSTALLATION
IMPORTANT: Before making the gas pipe connection give NOTE: If this is an propane application, consult your propane
serious consideration to providing the required clearance nec- supplier for pipe sizes and deliveries.
essary to remove the access panels on the unit
(e.g., economizer and filter access panels).
GAS PRESSURE SET-UP PRECAUTIONS
NOTE: In the absence of local codes, the installation must
conform with American National Standard--Z223.1--National Fuel ▲WARNING: NEVER USE AN OPEN FLAME
Gas Code, Latest Revision. TO TEST FOR GAS LEAKS: AN EXPLOSION COULD
OCCUR, CAUSING INJURY OR DEATH.
The available gas supply must agree with the required gas supply
marked on the unit nameplate. Minimum permissible gas supply IMPORTANT: The furnace and its individual shut-off valve
pressure for purpose of input adjustment must be at least 5.0" W. must be disconnected from the gas supply piping system
C. (inches Water Column) for natural gas and 11' W.C. for propane. during any pressure testing of that system at test pressures
exceeding 1/2 psig (3.48 kPa).
PIPE DELIVERY SCHEDULE (NATURAL GAS ONLY)
The furnace must be isolated from the gas supply piping system by
NOTE: The following procedure and tables below apply to closing its individual manual shut-off valve during any pressure
Natural Gas only. testing of the gas supply piping system at test pressures less than
or equal to 1/2 psig (3.48 kPa).
1.Obtain from the gas company the heating value and specific
gravity of the gas delivered. GAS SUPPLY LINE PRESSURE (ALL FUELS)

2.Determine the exact length of pipe needed. Before connecting the unit to the gas supply line, be sure to
determine the gas pressure in the line.
3.Read the BTUH input nameplate on the furnace.
If the gas supply pressure is excessive (above 13.8 inches water
4.Use the multiplier opposite the specific gravity of the gas given in column or 1/2 psig), install a pressure regulator either at the supply
Table 1 below and insert in the following formula: source or in the branch circuit serving the unit. Once the regulator
is installed, set it to provide a maximum pressure of 13.8" W.C. to
TABLE 1 the gas valve for natural gas with a minimum supply pressure of 5.0"
W.C. Maximum supply pressure of 13.8" W.C. to the gas valve for
SPECIFIC propane with a minimum pressure of 11.0" W.C.
MULTIPIER
GRAVITY
MULTIPIERS TO BE USED .50 1.10 NOTE: Maximum pressure to the gas valve for natural gas
WHEN THE SPECIFIC .55 1.04 is 13.8" W.C. Minimum pressure is 5.0" W.C. Maximum
GRAVITY OF THE GAS IS .60 1.00 pressure to the gas valve for propane is 13.8"W.C. Minimum
OTHER THAN 0.60 .65 .962 pressure to the gas valve is 11.0" W.C.

If the supply line pressure is below the minimum supply pressure

Furnace Input in BTUH
CFH = indicated on the unit nameplate, contact the gas supply company.
Gas Heat Content in BTU/Cu. Ft. X Multiplier
This will give the factor for columns 2 through 6 in Table 2. Follow these steps to complete the installation of the unit gas piping.
See Figure 14.
5.Using Table 2, select the pipe length nearest to yours.
1. Install a tapped, Style A (1/8-inch NPT tap) shut-off gas cock at
6.Follow this line vertically down to the exact CFH found in Step 4 the end of the gas supply line near the unit. Be sure the tapped
above or the next highest value. gas cock is downstream of the pressure regulator, if used.
7.Read horizontally to the left of this column for the required pipe
size diameter. r DEALER INSTALLED
GROUND UNION
TABLE 2 1/8" N.P.T.PLUGGED
NATURAL GAS ONLY ACCESS FOR TEST
TABLE OF CUBIC FEET PER HOUR OF GAS GAUGE CONNECTION
FOR VARIOUS PIPE SIZES AND LENGTHS FROM 6"
PIPE LENGTH OF PIPE (feet) GAS SUPPLY MIN TO MAIN
SIZE CONTROL
(inch) 10 20 30 40 50 60 70
VALVE
1/2 132 92 73 63 56 50 46 DRIP LEG
3/4 278 190 152 130 115 105 96 FIELD SUPPLIED MAIN UNIT
GAS VALVE, MUST BE
1 520 350 285 245 215 195 180 INSTALLED BY DEALER
1-1/4 1050 730 590 520 440 400 370 OUTSIDE UNIT.

THIS TABLE IS BASED ON PRESSURE DROP OF 0.3 INCH W.C. AND 0.6 SP.GR. GAS

Dwg. No. X664209 P01 Page 13

 GAS PIPING INSTALLATION
NOTE: The shut-off gas cock must be installed outside of
the unit and should meet the specifications of all appli-
cable national and local codes.
t BURNER & VALVE ILLUSTRATION

2.Install a ground union joint downstream of the shut-off cock.

This joint must also be installed outside of the unit.

3.Install a drip leg at least six (6) inches in depth next to the
union as shown in Figure 14. This drip leg is required to
collect any sediment that may be deposited in the line.

4.Before connecting the piping circuit to the unit, bleed the air
from the supply line. Then cap or plug the line and test the
pressure at the tapped shut-off cock. The pressure reading
should not exceed 13.8 inches water column.

5.Using an appropriate backup wrench on the gas valve inlet

boss, connect the gas piping to the unit. Check the
completed piping for leaks using a soap and water solution
or the equivalent.

6.After installation of the gas pipe in the unit, the pipe chase
opening should be closed with the filler/barrier plug pro-
vided.

MANIFOLD PRESSURE
Check the manifold pressure at the unit gas valve. Do not
exceed the recommended pressure shown on the unit name-
plate.

FLUE AND HOOD ILLUSTRATION

y
(SEE NOTES)

NOTES:
1.THE OUTLET FLUE RESTRICTOR IS REQUIRED
WHEN THE FURNACE IS OPERATED ON LOW INPUT
(AN OUTLET FLUE RESTRICTOR MAY BE REQUIRED
ON HIGH INPUT).

TO INSTALL THE OUTLET FLUE RESTRICTOR,

REMOVE THE TOP ACCESS PANEL AND FIT THE
OUTLET FLUE RESTRICTOR OVER THE OUTLET OF
THE FLUE DUCT. REASSEMBLE THE TOP ACCESS
PANEL ONTO UNIT.

Page 14 Dwg. No. X664209 P01

 FIRING RATE SELECTION
All units are capable of firing at a low or high rate. Check the unit b. Remove the slot screw on top of the gas valve for 1st stage
name-plate, to verify the firing rate of the unit as shipped from the manifold pressure adjustment.
factory.
c. Turn the adjustment nut IN to increase the gas flow rate, and
If the other input rate is desired, the conversion is made as follows:
OUT to decrease the gas flow rate using a 3/32" hex wrench.
1. Be sure the unit disconnect is open.
2. Be sure the gas valve is closed.
3. Remove furnace access panel. TABLE 3
4. Remove the presently installed gas orifices and replace with
GAS FLOW IN CUBIC FEET PER HOUR
the new gas orifices from the low fire kit. The orifices should extend
1/4 inch out of the manifold for burner support. 2 CUBIC FOOT DIAL
Sec. Flow Sec. Flow Sec. Flow Sec. Flow
5. For low fire operation an OUTLET FLUE RESTRICTOR 8 900 29 248 50 144 82 88
(packed in the low fire kit) must be installed (see Figure 16 on page 9 800 30 240 51 141 84 86
14). For high fire operation on a few models a different OUTLET
10 720 31 232 52 138 86 84
FLUE RESTRICTOR may have been required.
11 655 32 225 53 136 88 82
6. Reinstall the furnace access panel. 12 600 33 218 54 133 90 80
7. Open the gas valve. 13 555 34 212 55 131 92 78
14 514 35 206 56 129 94 76
8. Close the unit disconnect. 15 480 36 200 57 126 96 75
9. Follow the heating cycle instructions to test unit’s function. 16 450 37 195 58 124 98 73
17 424 38 189 59 122 100 72
10. Mark an “X” below the new input column on unit nameplate.
18 400 39 185 60 120 104 69
Attach conversion label to the unit below the nameplate. 19 379 40 180 62 116 108 67
20 360 41 176 64 112 112 64
NOTE: Do not convert to high fire when the units are applied above
2000 feet above seal level. 21 343 42 172 66 109 116 62
22 327 43 167 68 106 120 60
INPUT CHECK AND ADJUSTMENT 23 313 44 164 70 103 124 58
24 300 45 160 72 100 128 56
1. Make sure all gas appliances are off except the furnace.
25 288 46 157 74 97 132 54
2. Clock the gas meter with the furnace operating (determine the
26 277 47 153 76 95 136 53
dial rating of the meter) for one revolution. 27 267 48 150 78 92 140 51
28 257 49 147 80 90 144 50
3. Match the “Sec” column in the gas flow (in cfh) Table 3 with the
time clocked.
HIGH ALTITUDE INSTALLATION
4. Read the “Flow” column opposite the number of seconds
clocked. Unit nameplate ratings are based on equipment operation from sea
level to 2000 feet elevation above sea level. If the unit installation
5. Use the following factors if necessary. is from 2000 - 4500 feet elevation, it will be necessary to change the
burner orifices to the noted sizes, (ref. National Fuel Gas Code, sec
For 1 Cu. Ft. Dial Gas Flow CFH = 8.1.2, Appendix F, Table F4).
Chart Flow Reading / 2
For 1/2 Cu Ft. Dial Gas Flow CFH =
Chart Flow Reading / 4 MANIFOLD
GAS ORIFICE SIZE ORIFICE SIZE
PRESSURE
For 5 Cu. Ft. Dial Gas Flow CFH = TYPE 0 - 2000 ft 2000 - 4500 ft
( in. W.C. )
10X Chart Flow Reading / 4
NATURAL
( high input )
3.3 42* 43
6. Multiply the final figure by the heating value of the gas obtained NATURAL
from the utility company and compare to the nameplate rating. 3.3 44 45
( low input )
This must not exceed the nameplate rating.
PROPANE 10.0 54 55
7. Changes can be made by adjusting the manifold pressure.
* FACTORY SHIPPED
a. Attach a manifold pressure gauge.

Dwg. No. X664209 P01 Page 15

 FILTER INSTALLATION
AIR FILTERS TABLE 4
Filters are to be used with the YCC018-060F heating/cooling units.
NOMINAL FILTER* FILTER
The basic unit does not have filters in it. However, a filter frame UNIT
accessory is offered that will allow filters to be installed within the
CFM Sq.Ft.- SIZE RESISTANCE
unit. YC~018F/G 600 2.00 0.05
Otherwise a filter rack must be installed by the installer in the duct YC~024F/G 800 2.67 0.05
work. YC~030F/G 1000 3.33 0.05
Affix the filter label supplied with the unit adjacent to the filter area. YC~036F/G 1200 4 0.05
YC~042F/G 1400 4.67 0.05
*Filters must be installed in the return air system. The above square YC~048F/G 1600 5.33 0.05
footages are based on 300 F.P.M. face velocity. If permanent filters are
used, size per mfg. recommendation with clear resistance of 0.05" WC.
YC~060F/G 2000 6.67 0.05

ELECTRICAL WIRING
ELECTRICAL CONNECTIONS
GROUNDING: THE UNIT MUST BE ELECTRICALLY GROUNDED
Electrical wiring and grounding must be installed in accordance with IN ACCORDANCE WITH LOCAL CODES OR THE NATIONAL
local codes or, in the absence of local codes, with the National ELECTRIC CODE.
Electrical Code ANSI/NFPA 70, Latest Revision.
NOTE: Unit must be grounded for ignitor to operate prop-
ELECTRICAL POWER erly. Gas pipe to unit is not an adequate ground. Ground
the unit internally as provided. See wiring diagram for
It is important that proper electrical power be available for the unit. location.
Voltage variation should remain within the limits stamped on the unit
nameplate. CONTROL WIRING (CLASS II)

DISCONNECT SWITCH Low voltage control wiring should not be run in conduit with power
wiring unless Class 1 wire of proper voltage rating is used. Route
Provide an approved weatherproof disconnect either on the side of the thermostat cable or equivalent single leads of No. 18 AWG
the unit or within close proximity and within sight of the unit. colored wire from the thermostat subbase terminals through the
rubber gromment on the unit. See Figures 3 and 4 for the control
OVER CURRENT PROTECTION entry location. Make connections as shown on the unit wiring
diagram and in Figure 18.
The branch circuit feeding the unit must be protected as shown on
the unit rating plate. Do not short thermostat wires since this will damage the control
transformer.
POWER WIRING
Recommended wire sizes and lengths for installing the unit thermo-
The power supply lines must be run in weathertight conduit to the stat are provided in Table 5. The total resistance of these low
disconnect and into the bottom of the unit control box. Provide strain voltage wires must not exceed one (1) ohm. Any resistance in
relief for all conduit with suitable connectors. excess of 1 ohm may cause the control to malfunction because of
the excessive voltage drop.
Provide flexible conduit supports whenever vibration transmission
may cause a noise problem within the building structure.
TABLE 5
Be sure all connections are made tight. See Figure 18. THERMOSTAT WIRE SIZE AND MAXIMUM LENGTH

NOTES: For branch circuit wiring (main power supply to unit

disconnect), wire size for the length of run should be determined WIRE SIZE MAXIMUM LENTGH (Ft)
using the circuit ampacity found on the unit nameplate and the
N.E.C. 18 75
16 125
For more than 3 conductors in a raceway or cable, see the
N.E.C. for derating the ampacity of each conductor. 14 200

Page 16 Dwg. No. X664209 P01

 ELECTRICAL WIRING

i YCC-F FIELD WIRING DIAGRAM

THERMOSTAT HEAT ANTICIPATOR

The thermostat heat anticipators should be set to .4 amps on single After all electrical wiring is complete, set the thermostat system
or two stage thermostats. switch in the OFF position so that the compressor will not run
and then apply power by closing the system main disconnect
IMPORTANT: Upon completion of wiring check all electrical
switch. This will activate the compressor sump heat. Do not change
connections, including factory wiring within the unit, make
the Thermostat System Switch until power has been applied long
sure all connections are tight. Replace and secure all electrical box
enough to evaporate any liquid R-22 in the compressor. It is
covers and access doors before leaving the unit or turning on the
recommended that the sump heater be energized for eight (8) hours
power to the unit.
prior to starting.

Dwg. No. X664209 P01 Page 17

 START - UP
PRE-START QUICK CHECKLIST NOTE: Do not use the pressures from the unit's SERVICE FACTS
to determine the unit refrigerant charge. The correct charge is
● Is the unit properly located and level with the proper clearance? shown on the unit nameplate. To charge the system accurately,
See Figure 4. weigh in the charge according to the unit nameplate.
● Is the duct work correctly sized, run, taped, insulated, and VOLTAGE
weatherproofed with proper unit arrangement? See Ductwork
Installation section. With the compressor operating, check the line voltage at the unit.
The voltage should be within the range shown on the unit name-
● Is the gas piping correctly sized, run, trapped, and purged of air? plate. If low voltage is encountered, check the size and length of the
See Gas Piping section. supply line from the main disconnect to the unit. The line may be
undersized for the length of the run.
● Is the condensate line properly sized, run, trapped, and pitched?

● Is the filter of the correct size and number? Is it clean and in place? COOLING SHUT DOWN

● Is the wiring properly sized and run according to the unit wiring Place the system selector in the OFF position or reset thermostat at
diagram? a setting above room temperature.

● Are all the wiring connections, including those in the unit, tight? Do not de-energize the main power disconnect except when unit is
to be serviced. Power is required to keep the heat pump compres-
● Has the unit been properly grounded and fused with the recom- sor warm and boil off refrigerant in the compressor.
mended fuse size? See Wiring Data.
HEATING CYCLE
● Is the thermostat level, correctly wired, well located, and set for
the proper heat anticipation? NOTE: See Sequence of Heating Operation.

● Have the air conditioning systems been checked at the service These units are equipped with a solid-state ignition control that
ports for charge and leak tested if necessary? lights the burners each time the thermostat calls for heat. The
burners are extinguished during the OFF cycle.
● Does the condenser fan and indoor blower turn free without
rubbing, and are they tight on the shafts? The gas heating section of the unit can be started using the following
procedure:
● Has the indoor blower speed been determined and the proper
speed been set? See the Unit Wiring Diagram. 1. Be sure the thermostat is at its lowest setting and the power to
the unit is off.
● Has all work been done in accordance with applicable local and a. Turn the main shutoff valve on the gas supply line ON.
national codes?
b. Turn or switch the manual valve on the combination gas
● Are all covers and access panels in place to prevent air loss and valve ON position.
safety hazards?
2. Be sure the burner compartment access panel is in place.
STARTING THE UNIT IN THE COOLING MODE a. Turn on the electrical power to the unit.
CAUTION: Before starting the system on the cooling cycle, turn the b. Turn the thermostat to the highest setting in the heating
thermostat switch to OFF and close the unit disconnect switch. This cycle.
procedure energizes the compressor crankcase heater, vaporizing
any liquid refrigerant in the crankcase. This is a precaution against 3. As the thermostat calls for heat, the system cycles as follows:
foaming at startup which could damage the compressor bearings. a. The combustion blower is energized.
Allow the heater to operate a minimum of eight (8) hours. b. The pressure switch is closed.
NOTE: See the section on “Sequence of Operation” for a c. The gas valve opens and the ignitor lights the burner.
description of the cooling operating sequence. d. Cycle the thermostat on and off a few times to check out the
To start the unit in the cooling mode, set the thermostat system control system and burner operation characteristics.
switch to COOL and move the thermostat COOL indicator to a 4. With the burners operating, check the manifold pressure with a
setting below room temperature. The condenser (outdoor) fan manometer. Do not exceed recommended pressures.
motor compressor and evaporator (indoor) fan motor will operate
automatically. 5. Adjust the unit to obtain an air temperature rise with that
specified on the unit nameplate.
OPERATING PRESSURES
6. NOTE: For manifold pressures and orifice sizes for gas with
After the unit has operated in the cooling mode for a short period of other BTU ratings, contact the local gas utility. Manifold
time, install pressure gauges on the gauge ports of the discharge pressure should be 3.5 inches water column (+0.1). Input must
and suction line valves. Check the suction and discharge pressures not exceed the value shown on the rating plate.
and compare them to the normal operating pressures provided in
the unit’s SERVICE FACTS. 7. Set the heat anticipator of the thermostat to equal the amperage
draw of the gas valve, approximately 0.7.

Page 18 Dwg. No. X664209 P01

 START - UP
8. Set the thermostat at the desired temperature setting and the 6. Cycle the thermostat OFF and ON a few times at a rate of not
unit will function automatically. more than once every thirty (30) seconds. Check both the
control operation and the burner operating conditions.
STARTING THE UNIT IN THE GAS HEATING MODE
MANIFOLD PRESSURE
1. Check to make sure all grilles and registers are open and all unit
access doors are closed before start-up. 1. Connect a manometer to the pressure tap at the outlet side of
the unit’s gas valve. Read the manifold pressure with the main
2. Purge the gas supply line of air by opening the union ahead of burners firing.
the unit. When the odor of gas is detected, retighten the union
and wait five (5) minutes before proceeding. 2. If the manifold pressure reading does not match the value
indicated on the unit nameplate, the unit pressure regulator
3. Set the wall thermostat to its lowest position and place the fan must be adjusted as follows:
switch in the AUTO or ON position.
a. Remove the cover screw on the gas regulator located on the
4. Open the main gas valve(s) and turn on the unit power supply. front side of the unit’s gas valve.
b. Turn the adjusting screw clockwise to increase manifold
5. Reset the heating temperature lever on the room thermostat at
pressure or counterclockwise to decrease manifold pres-
the highest value above room temperature. The combustion
sure.
blower motor should energize. The main burners should light
within 20-25 seconds. Initial start may be delayed somewhat if 3. Check the temperature rise during furnace operation to insure
the unit has not been purged and air is trapped in the gas line. that it falls within the range specified on the unit nameplate.
NOTE: Blue smoke produced by the heat exchanger during the 4. If the temperature rise noted is outside of the specified limits,
initial burner firing is caused by a thin film of oil on the surface adjust the indoor air flow to cause the temperature rise of the
of the heat exchanger. This oil will burn off quickly. heat exchanger to fall within the required range.

IGN LED DIAGNOSTIC INDICATOR

FLASHING SLOW NORMAL CALL FOR HEAT
CONTINUOUS ON NORMAL
CONTINUOUS OFF CHECK POWER / INTERNAL FAILURE
2 FLASHES SYSTEM LOCKOUT ( NO FLAME )
3 FLASHES PRESSURE SWITCH PROBLEM
4 FLASHES HIGH LIMIT (TCO) OPEN
5 FLASHES FLAME SENSED WITH GAS VALVE OFF
6 FLASHES FLAME ROLLOUT SWITCH (FL) OPEN
7 FLASHES W1 & W2 SWAPPED

FINAL INSTALLATION CHECKLIST

● Does the unit run and operate as described in the section on ● Has the ductwork been checked for air leaks and condensation?
“Sequence of Operation” in response to the room thermostat?
● Has the furnace manifold pressure been checked and adjusted
● Are the condenser fan and indoor blower operating correctly with if necessary?
proper rotation and without undue noise?
● Has the heating air temperature rise been checked?
● Is the compressor operating correctly and has the system been
checked with a charging chart? ● Has the unit been checked for tubing and sheet metal rattles?
Are there any other unusual noises to be checked?
● Has the voltage and running current been checked to determine
if it is within limits? ● Are all covers and panels in place and properly fastened?

● Has the thermostat been checked for calibration and the air ● Has the owner or maintenance personnel been given this manual
discharge grilles adjusted to balance the system? and the warranty? Has the owner or maintenance been in-
structed on proper operation and maintenance of this unit?

Dwg. No. X664209 P01 Page 19

 SEQUENCE OF OPERATION
The setting of the system switch on the room Following this time period the valve is energized
thermostat controls the operation of the unit heat- and the spark is started. If the flame is not sensed
ing or cooling cycles. Once the system switch is by the flame detector (FD) within 7 seconds the
placed either in the “HEAT” or “COOL” position, valve is de-energized and the spark is stopped.
unit operation is automatic. A fan switch on the A second retry is then attempted. If this attempt at
thermostat also provides for continuous operation ignition is unsuccessful, a third retry will be at-
of the evaporator fan when desired. The fan switch tempted after a prepurge period. If this third attempt
“ON” position provides continuous operation while at ignition is unsuccessful, the control will lock out.
the “AUTO” position provides operation during the It can be reset by removing power to the unit or by
heating or cooling cycles. turning the thermostat from “on” to “off” for approxi-
HEATING CYCLE mately three seconds, then back “on.” If not reset,
On a call for heat by the room thermostat, the the control module will automatically reset in 1
control module (IGN) runs its self-check routine. hour.
After the control has verified that the pressure The temperature limit switch (TCO) protects against
switch (PS) contacts are open, the limit switch overheating if the indoor motor (IDM) fails to oper-
(TCO) contacts are closed, and the flame rollout ate. Also, a fusible link (FS) protects against flame
(FL) switch is closed, the combustion fan motor rollout due to flue blockage. These switches will
(CFM) will be energized. interrupt the operation of the unit by de-energizing
As the combustion fan motor (CFM) comes up to the ignition control module (IGM) if overheating
speed, the pressure switch (PS) contacts will close. occurs.
After approximately 20 seconds, for the combus- The temperature limit switch (TCO) is located in the
tion fan motor (CFM) prepurge, the gas valve (GV) gas compartment. This automatic reset device
is energized permitting gas flow to the burners. protects against excessive leaving air temperature.
Concurrently, the spark ignitor (IP) is energized. The fusible link (FS) is located in the gas compart-
The flame detector (FD) confirms that ignition has ment near the burners. This is a single use device
been achieved within the seven second trial period. designed to protect against any form of flame
Upon proof of ignition, the delay to indoor fan on rollout.
period begins timing and after approximately 45 COOLING CYCLE
seconds, the indoor blower motor (IDM) will be
With the room thermostat system switch in the
energized and will continue to run during the heat-
“COOLING” position and the fan switch in the
ing cycle.
“AUTO” position, the compressor contactor (CC)
When the thermostat is satisfied, the gas valve and the indoor fan relay (F) are energized.
(GV) will close and the flame will extinguish. The
The energized compressor contactor (CC) com-
combustion fan motor (CFM) will continue to run for
pletes the circuit to the compressor (CPR) and a
a postpurge period of approximately 5 seconds
secondary circuit to the outdoor fan motor (ODM).
then will be de-energized. The indoor blower motor
If the compressor safety controls are closed, the
(IDM) will continue to run for the fan off period (field
compressor (CPR) will operate with the outdoor fan
selectable 60 or 90 seconds (by jumpers), then will
motor (ODM). The indoor fan motor (IDM) will
be de-energized by the control module.
operate. The thermostat will continue to cycle the
SAFETY SEQUENCES AND LIMIT CONTROLS compressor and fans to maintain the desired tem-
During the main burner operation, if gas is inter- perature.
rupted or discontinued, the gas valve (GV) is de- With the thermostat fan switch in the “ON” posi-
energized instantly. The ignition control module tion, the indoor fan motor (IDM) will continue to
(IGN) then enters the retry mode. The retry mode run regardless of compressor and condenser fan
allows the control (IGN) to purge for 60 seconds. operation.

Page 20 Dwg. No. X664209 P01

 CHECKOUT PROCEDURE

o
TROUBLESHOOTING CHART

SYSTEM FAULTS
REFRIGERANT CIRCUIT
Liquid Pressure Too high
Liquid Pressure Too Low

Suction Pressure Too High

Suction Pressure Too Low

Liquid Refrigerant floodback (TXV System)

Liquid Refrig. floodback (Cap. Tube System)
I. D. Coil Frosting
Compressor Runs Inadequate or No Cooling

ELECTRICAL
Compressor & O.D. fan Do Not Start

Compressor Will Not Start But O.D. Fan Runs

O.D. Fan Won't Start
Compressor Hums But Will Not Start
Compressor Cycles on IOL
I.D. Blower Won't Start

P-PRIMARY CAUSES S-SECONDARY CAUSES

Dwg. No. X664209 P01 Page 21

 MAINTENANCE
ROUTINE MAINTENANCE BY OWNER ● Visually inspect the unit to ensure that the airflow required for
You can do some of the periodic maintenance functions for your combustion and condenser coil is not obstructed from the unit.
YCY-F unit yourself; this includes replacing the disposable or ● Inspect the control panel wiring to verify that all electrical
cleaning the permanent air filters, cleaning the unit cabinet, connections are tight and that the wire insulation is intact.
cleaning the condenser coil, and conducting a general unit ● Check the operation of the gas ignition system as follows:
inspection on a regular basis. Turn off the gas supply with the unit operating to verify that the
When the system is in constant operation. In new homes, gas valve closes and that a reignition cycle is initiated by the
check the filters every week for the first four (4) weeks. unit.
● Visually inspect the inside of the burners and the burner ports
If you have disposable-type filters, replace them with new filters
of the same type and size. Do not attempt to clean disposable for deposit buildup and corrosion. Wipe and brush the inside
filters. of the burner and the burner ports and then clean with a dry
cloth. If the deposit buildup or corrosion is excessive, replace
Permanent-type filters can be cleaned by washing them with a the burners.
mild detergent and water. Make sure that the filters are thor-
oughly dry before reinstalling them in the unit (or duct system). FLUE CLEANING
Before each heating season, the flue should be inspected for
NOTE: It may be necessary to replace permanent filters signs of flaking rust and soot deposits. Dirty flues should be
annually if washing fails to clean the filter or if the filter shows cleaned by qualified service personnel ONLY using the
signs of deterioration. Be sure to use the same type and size following procedure:
as was originally installed. 1. Turn the room thermostat to the OFF position. Turn the main
power disconnect OFF. Turn the manual gas valve OFF.
CONDENSER COIL 2. Remove the flue cap, the lower access panel, and the upper
Unfiltered air circulates through the unit's condenser coil and can access panel.
cause the coil’s surface to become clogged with dust, dirt, etc. 3. Remove the combustion blower assembly from the fluebox.
To clean the coil, vertically (i.e., with the fins) stroke the coil Remove the flue box and the flue restrictors.
surface with a soft-bristled brush. 4. Remove all wires from the gas value while carefully noting
Be sure to keep all vegetation away from the condenser coil their location.
area. 5. Disconnect the gas supply line from the valve.
▲WARNING: TO PREVENT AN EXPLOSION 6. Remove the manifold retaining screws and pull the burner-
manifold assembly from the heat exchanger.
OR POSSIBLE INJURY, DEATH AND EQUIPMENT DAMAGE,
DO NOT STORE COMBUSTIBLE MATERIALS, GASOLINE 7. Remove the inlet turbulators being careful not to break or
OR OTHER FLAMMABLE VAPORS OR LIQUIDS NEAR THE damage them.
UNIT. 8. Wipe the flue box and flue baffles clean with a clean, dry
cloth.
MAINTENANCE PERFORMED BY SERVICEMAN-- 9. CAUTION: Never use combustible cleaning fluids on
COOLING SEASON any part of the furnace.
To keep your unit operating safely and efficiently, the manufac- 10. Replace all gaskets with new ones.
turer recommends that a qualified serviceman check the entire
system at least once each year and any other time that you feel 11. Replace all damaged or broken turbulators with new ones.
one is needed. Your serviceman should examine these areas of 12. Reassemble the unit by reversing Steps 2 through 7 above.
your DCX-F unit: Take care that all gaskets seat properly.
● filters (for cleaning or replacement) 13. Check all wires for correct installation by referring to the
● motors and drive system components unit’s electrical wiring diagram.
● economizer gaskets (for possible replacement) 14. Leak test all gas line connections with a soap and water
solution or the equivalent.
● safety controls (for mechanical cleaning)
15. Reinstall the top and bottom access panels and the flue
● electrical components and wiring (for possible replacement stack.
and connection tightness)
16. Visually inspect the unit to ensure that the airflow opening for
● condensate drain (for cleaning) combustion is not obstructed.
● unit duct connections (to see that they are physically sound 17. Follow the start-up procedure above to place the unit back in
and sealed to the unit casing) service.
● unit mounting support (for structural integrity)

▲WARNING: DO NOT OPERATE THE UNIT

● the unit (for obvious unit deterioration)
MAINTENANCE PERFORMED BY SERVICEMAN-- WITHOUT THE EVAPORATOR FAN ACCESS PANEL IN
HEATING SEASON
PLACE. REINSTALL THE ACCESS PANEL AFTER
Complete the unit inspections and service routines described PERFORMING ANY MAINTENANCE PROCEDURES ON THE
below at the beginning of each heating season. FAN. OPERATING THE UNIT WITHOUT THE ACCESS
PANEL PROPERLY INSTALLED MAY RESULT IN SEVERE
PERSONAL INJURY OR DEATH.

Page 22 Dwg. No. X664209 P01

 LIMITED WARRANTY
COMBINATION GAS ELECTRIC AIR CONDITIONER
YCC, YCD, YCH, YCP, YHC and YSC
Models Less Than 20 Tons for Residential Use*
(Parts Only)

This limited warranty is extended by American Standard Inc., to the original purchaser and to any
succeeding owner of the real property to which the Combination Gas Electric Air Conditioner is
originally affixed, and applies to products purchased and retained for use within the U.S.A. and
Canada.
If any part of your Combination Gas Electric Air Conditioner fails because of a manufacturing defect
within five years from the date of the original purchase, Warrantor will furnish without charge the
required replacement part. Any local transportation, related service labor, diagnosis calls, air filters,
refrigerant and related items are not included.
If the sealed motor-compressor fails or if the outdoor coil should become defective, either or both
events occurring because of a manufacturing defect within five years from the date of original
purchase, Warrantor will furnish without charge the required replacement compressor and/or
outdoor coil. Any local transportation, related service labor, diagnosis calls, refrigerant and related
items are not included.
In addition, if the steel heat exchanger fails because of a manufacturing defect within the sixth
through tenth year from the date of original purchase, Warrantor will furnish without charge a
replacement heat exchanger. Any local transportation, related service labor and diagnosis calls are
not included.
This limited warranty does not cover failure of your combination gas electric air conditioner if it is
damaged while in your possession, damage caused by unreasonable use of the combination gas
electric air conditioner and/or damage from failure to properly maintain the combination gas
electric air conditioner as set forth in the Use and Care manual (see Proper Maintenance
section).
This limited warranty applies to product installed on or after 10/1/2001 where product is
manufactured after 1/1/2000.This limited warranty is not retroactive to any installations prior to 10/1/
2001 or on product produced prior to 2000.
THE LIMITED WARRANTY AND LIABILITY SET FORTH HEREIN ARE IN LIEU OF ALL OTHER
WARRANTIES AND LIABILITIES, WHETHER IN CONTRACT OR IN NEGLIGENCE, EXPRESS
OR IMPLIED, IN LAW OR IN FACT, INCLUDING IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR PARTICULAR USE, AND IN NO EVENT SHALL
WARRANTOR BE LIABLE FOR ANY INCIDENTAL OR CONSEQUENTIAL DAMAGES.
Some states do not allow limitations on how long an implied limited warranty lasts or do not allow
the exclusion or limitation of incidental or consequential damages, so the above limitation or
exclusion may not apply to you.This limited warranty gives you specific legal rights, and you may
also have other rights which vary from state to state.
Parts will be provided by our factory organization through an authorized service organization in
your area listed in the yellow pages. If you wish further help or information concerning this limited
warranty, contact:
American Standard Inc. GW-632-1802
Troup Highway
Tyler,TX 75711-9010
Attention:
Dwg. Manager,
No. X664209 P01 After Sales Support Page 23
 LIMITED WARRANTY
COMBINATION GAS ELECTRIC AIR CONDITIONER
YCZ, YCY, YCX, YCC, YCD, YCH, YCP, YHC and YSC
Models Less Than 20 Tons for Commercial Use*
(Parts Only)

his warranty is extended by American Standard Inc., to the original purchaser and to any succeeding owner of
the real property to which the Combination Gas Electric Air Conditioner is originally affixed, and applies to
products purchased and retained for use within the U.S.A. and Canada. There is no warranty against
corrosion, erosion or deterioration.
If any part of your Combination Gas Electric Air Conditioner fails because of a manufacturing defect within one
year from the date of the original purchase, Warrantor will furnish without charge the required replacement
part.
In addition, if the sealed motor-compressor fails because of a manufacturing defect within the second through
fifth year from the date of original purchase, Warrantor will furnish without charge the required replacement
compressor.
In addition, if the steel heat exchanger fails because of a manufacturing defect within the second through fifth
year from the date of original purchase, Warrantor will furnish without charge a replacement heat exchanger.
Warrantor’s obligations and liabilities under this warranty are limited to furnishing F.O.B. Warrantor factory or
warehouse at Warrantor designated shipping point, freight allowed to Buyer’s city, replacement parts for
Warrantor’s products covered under this warranty. Warrantor shall not be obligated to pay for the cost of lost
refrigerant. No liability shall attach to Warrantor until products have been paid for and then liability shall be
limited solely to the purchase price of the equipment under warranty shown to be defective.
THE WARRANTY AND LIABILITY SET FORTH HEREIN ARE IN LIEU OF ALL OTHER
WARRANTIES AND LIABILITIES, WHETHER IN CONTRACT OR IN NEGLIGENCE, EXPRESS
OR IMPLIED, IN LAW OR IN FACT, INCLUDING IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR PARTICULAR USE, AND IN NO EVENT SHALL
WARRANTOR BE LIABLE FOR ANY INCIDENTAL OR CONSEQUENTIAL DAMAGES.
Some states do not allow limitations on how long an implied warranty lasts or do not allow the exclusion or
limitation of incidental or consequential damages, so the above limitation or exclusion may not apply to you.
This warranty gives you specific legal rights, and you may also have other rights which vary from state to state.
American Standard Inc.
Troup Highway
Tyler, TX 75711-9010
Attention: Manager, After Sales Support
GW-606-4800
* This warranty is for commercial usage of said equipment and not applicable when the equipment is used for
a residential application. Commercial use is any application where the end purchaser uses the product for
other than personal, family or household purposes.

Since American Standard has a policy of continuous product and

American Standard inc. product data improvement, it reserves the right to change design
6200 Troup Highway and specification without notice.
Tyler, TX 75711-9010
Technical Literature - Printed in U.S.A.

Page 24 Dwg. No. X664209 P01