OWNER’S MANUAL

CX1 ProVector Series ®

Electric Convection Air Heaters for Hazardous Locations

This manual covers installation, maintenance, repair and parts.

MODEL CODING
APPROVED LOCATIONS
Electric convection air heaters are cULus listed for
the following hazardous locations: CX - A1 - N0
(without built-in thermostat) MODEL SERIES
Class I, Div. 1 & 2, Groups B, C & D T’Stat Voltage
0 - No Built-in T’stat
Class I, Zones 1 & 2, Groups IIA, IIB + H2 1 - 120V
Heater Kilowatts 2 - 208V
Temperature Code T2A 280°C (536°F) A - 1.2kW 3 - 240V
4 - 480V
B - 1.8kW 6 - 277V
(with built-in thermostat)
Class I, Div. 1 & 2, Groups C & D C - 3.6kW

Class I, Zones 1 & 2, Groups IIA & IIB D - 4.8kW

E - 7.6kW T’Stat Options
Temperature Code T2A 280°C (536°F) Heater Voltage N - No Built-in T’stat
1 - 120V * B - Built-in T’stat
For details of hazardous locations with potential for 2 - 208V
explosion, refer to the Canadian Electrical Code, 3 - 240V * Not available in Group B,
4 - 480V (IIB + H2) and certain voltages
Part 1, Section 18 or National Electrical Code 5 - 600V (refer to Technical Data Table)
6 - 277V
Articles 500 - 516.

WARNING!
READ ALL IMPORTANT NOTICES ON PAGE 3.
ProVector and RUFFNECK are registered trademarks.
Copyright © 2000. All rights reserved.

Pt. No. 6348-10 Printed in Canada

 Photocopy
this page
for reuse.
WARNING:
Disconnect heater from the power supply before opening enclosures or servicing heater.
Lock the switch in the “OFF” (open) position and/or tag the switch to prevent unexpected power application.
This heater should only be serviced by personnel with heating and hazardous location equipment experience.

HEATER MAINTENANCE CHECKLIST

Heater Model: ____________________________ Serial No.: ______________________________
Date of Maintenance: ______________________ Maintenance Done By: ____________________
Comments:__________________________________________________________________________
__________________________________________________________________________________

PERIODIC (before and as required during heating season)

1. CLEAN
❑ Finned Tubes
❑ Cabinet top and below unit
Remove dust using compressed air. Do not spray with water or solvents.
Do not immerse in water or solvents.

2. CHECK
❑ All explosion-proof covers for tightness.

ANNUAL (before heating season)

1. ELECTRICAL
❑ Check all terminal connections and conductors. Tighten loose connections.
Conductors with damaged insulation must be replaced.
❑ Check all explosion-proof conduits. Replace damaged conduits, unions and plugs. Ensure 5 turns
of engagement on all threaded connections.

2. MECHANICAL
❑ Check all enclosures. Inside of enclosures must be clean, dry and free of foreign materials.
Note: Enclosure joints are metal to metal. Do not use gasket material or sealant in joints.
❑ Check the tightness of all hardware. All nuts and bolts must be tight.
❑ Turn heater on for a minimum of five minutes. Check for warm air exiting heater through top vents.

For assistance, please call

Toll Free: 1-800-661-8561 (24 hrs)
U.S. & Canada

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 IMPORTANT NOTICES
WARNING:
Read and adhere to the following. Failure to do so may result in severe or fatal injury.
1. Read and follow all instructions in this manual. 9. External surfaces get hot and can cause burns
2. Heater is to be used only in atmospheres having with prolonged contact.
an ignition temperature higher than the heater’s 10. Operate the heater only while it is permanently
maximum rated operating temperature, as shown mounted in an upright position. Refer to the
on the heater data plate. Refer to applicable “Installation-Mechanical” section for details.
electrical codes for additional information. 11. Heater must be kept clean. When operating in a
3. Heater to be used only in the hazardous dirty environment, regularly clean the finned
locations indicated on the heater data plate. tubes, top vents, and keep bottom opening free
4. Heater is for dry, indoor use only. Do not of obstructions. Follow the recommended
immerse in water. Do not store or use in areas maintenance procedures. Refer to the “Heater
exposed to rain or snow. Maintenance Checklist” section for details.
5. Maximum ambient operating temperature 40°C 12. Do not operate the heater in atmosphere
(104°F). corrosive to steel or aluminum.
6. Heater is to be connected and serviced only by a 13. Use factory approved replacement parts only.
qualified electrician experienced with hazardous 14. Conduit seals are not required in the heater’s
location equipment. factory installed conduits.
7. Installation and wiring of the heater must adhere 15. A conduit seal is required within 6” of field
to all applicable codes. entries.
8. Before opening any enclosures, disconnect the 16. If there are any questions or concerns regarding
heater from the power supply. Lock the switch in the heater, contact the factory. Refer to the last
the “OFF” (open) position and/or tag the switch page of this manual for details.
to prevent unexpected power application.

WARRANTY WILL BE VOID

IF INSTRUCTIONS ARE NOT FOLLOWED

INSTALLATION
The installation instructions provide a general guideline for the installation and wiring of the heater.
All applicable codes must be adhered to.

MECHANICAL
Heaters must be installed as follows:

LOCATION
1. The air discharge is not directed at a thermostat.
2. The air discharge is across areas of heat loss, such as windows.
3. If equipment freeze protection is of importance, locate heater as close to equipment as possible.

MOUNTING
1. Heater must be mounted level on a vertical surface using the factory supplied mounting brackets such
that there are no obstructions to impede air inlet or discharge (Figure 1b & 3).
2. The mounting surface must be strong enough to:
a. support the heater’s weight, refer to “Specifications” section,
b. withstand abusive situations such as transportable installations of the heater.wiring of the heater must

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3. Secure mounting brackets to vertical surface with FIGURE 1a
the top mounting hole 38mm (1-1/2”) below the
desired top surface height (Figure 1a). Refer to
38.0 mm
Figure 2 for physical dimensions and Figure 3 for (1.5”)
required installation clearances. Mounting brackets
are to be spaced to match the slots in the rear
panel of heater cabinet.
4. After mounting brackets are secured, tilt the heater
and lower it onto the top tabs of the mounting FIGURE 1b
bracket such that the tabs go into the mounting
slots on the rear panel of the heater cabinet
(Figure 1b).
5. Carefully swing the bottom of the heater into the
mounting brackets so that it is resting on the
Top Tab Detail
bottom tab (Figure 1b).
6. Insert the securing screw through the bottom
mounting bracket tab and into the cabinet to keep Mounting Bracket
the heater from dislodging from the mounting
bracket (Figure 1b).

Securing
Screw
Note: Figures 1-3 are shown with optional built-in room thermostat. Bottom Tab Detail

FIGURE 2: Physical Dimensions A

B 144.0 mm
Heater kW Rating “A” Dimension “B” Dimension (5.67”)
REF.
1.2 - 3.6 940.0 mm (37.0”) 796.0 mm (31.34”)
4.8 1400.0 mm (55.125”) 1256.0 mm (49.45”)
7.6 1654.0 mm (65.125”) 1511.0 mm (59.49”)

Internal Volume of Convector Enclosure

without built-in XCT thermostat 262 cm3 (16.0 in3) 206 mm
with built-in XCT thermostat 356 cm3 (21.7 in3) (8.11”)

52.6 mm
(2.07”) 515.5 mm
(20.30”)

Convector Enclosure.
For internal volumes see associated chart

FIGURE 3: Installation Clearances

Min. Min.
457.0 mm 9.5 mm
(18.0”) (0.375”)
Wall
1219.0 mm
(48.0”)
Required for ease
of installation
and servicing
Min.
9.5 mm
305.0 mm
(0.375”)
(12.0”)
Required for ease
of installation
Min.
203.0 mm
(8.0”)

Floor

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 ELECTRICAL
WARNING
Disconnect the power supply before installation of the heater. Lock the switch in
the “OFF” (open) position and/or tag the switch to prevent unexpected power application.
Installation and wiring of the heater must adhere to all applicable codes.

GENERAL
1. Use only copper conductors and approved explosion-proof wiring methods during installation. Refer to
the “Technical Data” Table or heater data plate for the voltage, amperage and wattage ratings when
sizing for the appropriate conductors. All supply conductors should be rated for operating at
temperatures up to 90°C (194°F).
2. Supply voltage must be within 10% of the data plate rating. External over-current protection is required
and must meet data plate ratings for voltage, amperage and frequency.

FIELD WIRING
1. Heater has been supplied with an enclosure that has a standard 3/4” NPT threaded opening to
accommodate the line conductors (see Figure 4 for connection details). Use wire connectors rated for
minimum 90°C (194°F).

NOTE: If remote thermostats other than the factory supplied are used, ensure that they will not allow
the room temperature to exceed ambient temperature limitations of the heater (40°C/104°F) and
are suitable for the area’s hazardous atmosphere classification. When using any control devices,
ensure that the voltage and amperage ratings match the heater’s electrical ratings. If not, a
contactor may be required.

FINAL INSPECTION
1. Before application of electrical power:
a. check that all connections are secured and comply with the wiring diagram (see Figure 4) and
applicable code requirements,
b. confirm that the supply voltage is compatible with the data plate specifications,
c. remove any foreign objects from the heater, and
d. ensure all external fittings and enclosure covers are secured.

FIGURE 4: Wiring Diagram for remote mount and built-in room thermostats

Element
L1*

L2
Element

Room
Thermostat * On 120V units
L1 represents
neutral

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 REPAIR AND REPLACEMENT
WARNING
Disconnect the power supply before installation of the heater. Lock the switch in the “OFF” (open)
position and/or tag the switch to prevent unexpected power application. Heater surfaces may be hot.

FINNED TUBE/ELEMENT ASSEMBLY

A complete finned tube assembly is available from the factory. Refer to Parts Diagram for item numbers.
1. Remove the front cabinet panel (Item #1).
2. Remove convector enclosure’s (Item #13) cover and disconnect wires.
3. De-couple two unions (Item #9) connecting convector enclosure and finned tube assemblies (Item #7).
4. Remove 3/4” NPT plug (Item #11) from element conduit (Item #10) and then pull out wire connector and
disconnect the wires.
5. De-couple remaining two unions and remove element conduit.
6. Remove union halves and lock-nut (Item #8) from ends of each finned tube requiring replacement and set
aside for re-use on new factory supplied finned/element assemblies.
7. Remove bolts (Item #16) from lower tabs of wall mount brackets (Item #6), remove heater from wall
mount brackets, and loosen the bolts from the finned tube bracket (Item #5).
8. Remove the damaged finned tube/element assemblies and install replacements.
9. Re-assemble heater using the reverse order of the preceding instructions.
Important: All threaded connections must be wrench tight with a minimum of 5 turns engagement.

CABINET PANELS AND BRACKETS

Replacement cabinet panels and brackets are available from the factory.
NOTE: For purposes of safety and convenience, all repairs and maintenance must be done with factory
authorized parts and materials.

SPECIFICATIONS
Nominal kW
1.2 1.8 3.6 4.8 7.6

Net Weight (lbs) 54.0 54.0 54.0 79.4 91.5

(kg) 24.5 24.5 24.5 36.0 41.5

Shipping Weight (lbs) 61.3 61.3 61.3 88.4 104.3

(kg) 27.8 27.8 27.8 40.1 47.3

Enclosures NEMA Type 7. For dry indoor use only. Do not immerse in water. Do not store
or use in areas exposed to rain or snow.

Mounting Brackets Two 14 Ga. (0.075 in)(1.90mm) galvanized steel.

Heating Elements Two Incoloy sheathed elements.

Optional Built-in XCT Thermostat Explosion-proof with low to high settings.

Cabinet Material 14 Ga. steel. Rear panel is galvanized. Front and side panels
are baked green-grey epoxy powder coated with five-stage pretreatment,
including iron phosphate.

Temperature Code Rating T2A 280°C (536°F)

Hazardous Locations Without Built-in T’Stat Class I, Div. 1 & 2, Groups B, C, & D; Class I, Zones 1 & 2, Groups IIA, IIB + H2
With Built-in T’Stat Class I, Div. 1 & 2, Groups C & D; Class I, Zones 1 & 2, Groups IIA & IIB

Temperature Limitations Operational: -45°C to 40°C (-49°F to 104°F)

Storage: -45°C to 80°C (-49°F to 176°F)

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 PARTS DIAGRAM
4 6
5
8
2 plcs

9
2 plcs
10
11
2
2 plcs

1 16 General
Assembly
Screw
3

8
2 plcs

9
2 plcs

7 C1
C2 See t’stat
options
14

15 16 2 plcs 15 16 12
C1
Gnd wire Gnd wire C1 C2
C2

13
17
18 2 plcs
Conduit Without Built-in Without
Connect to “common”
Detail and “norm open” built-in t’stat built-in
terminals of built-in t’stat t’stat option t’stat
wiring option
Built-in t’stat
wiring

PARTS LIST
Item # Description 1.2 - 3.6 kW Rating 4.8 kW Rating 7.6 kW Rating
Part # Qty. Part # Qty. Part # Qty.
1 Panel, Front 6488 1 6493 1 6490 1
2 Panel, Back 6487 1 6494 1 6489 1
3 Panel, Right 6491 1 6491 1 6491 1
4 Panel, Left 6492 1 6492 1 6492 1
5 Bracket, Finned Tube 6485 1 6485 1 6485 1
6 Kit, Wall Mounting 6602 1 6602 1 6602 1
7 Finned Tube Assy c/w Element * 2 * 2 * 2
8 Nut, 3/4 Aluminum Lock 6449 4 6449 4 6449 4
9 Union, 3/4 NPT Male/Female 6506 4 6506 4 6506 4
10 Conduit, Element 6497 1 6497 1 6497 1
11 Plug, 3/4 Ex-Proof 1443 2 1443 2 1443 2
12 Kit, Group B, (IIB +H2) Enclosure 6604 1 6604 1 6604 1
13 Enclosure, Convector 6211 1 6211 1 6211 1
14 Kit, Built-in XCT T’Stat 6603 1 6603 1 6603 1
15 Wire Connector, 150°C (302°F) ** ** ** ** ** **
16 Screw, 10-24 x 1/2 in. Thd Ct 4972 20 4972 21 4972 22
17 Fork Connector, 12-10GA #10 2088 2 2088 2 2088 2
18 Wire Connector, 300°C(+) 6529 1 6529 1 6529 1
* Refer to Technical Data
** Customer supplied. Quantity varies: 1 for built-in t’stat option; 2 for remote t’stat option.

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 TECHNICAL DATA
Model Unit Unit Cabinet Unit Unit Supply Maximum Finned Tube
Code Wattage Output Length Voltage Current Phase Wire Size Circuit Fuse c/w Element
(kW) (BTU/Hr) (Inches) (Volts) (Amps) (AWG) (Amps)* Part #
WITHOUT BUILT-IN THERMOSTAT Temp Code Rating=T2A 280°C (536°F)

CX-A1-N0 1.2 4097 31.34 120 10.0 1 12 15 6638

CX-A2-N0 1.2 4097 31.34 208 5.8 1 12 15 6639
CX-A3-N0 1.2 4097 31.34 240 5.0 1 12 15 6640
CX-A4-N0 1.2 4097 31.34 480 2.5 1 12 15 6641
CX-A5-N0 1.2 4097 31.34 600 2.0 1 12 15 6642
CX-A6-N0 1.2 4097 31.34 277 4.3 1 12 15 6990
CX-B1-N0 1.8 6146 31.34 120 15.0 1 12 20 6643
CX-B2-N0 1.8 6146 31.34 208 8.7 1 12 15 6644
CX-B3-N0 1.8 6146 31.34 240 7.5 1 12 15 6645
CX-B4-N0 1.8 6146 31.34 480 3.8 1 12 15 6646
CX-B5-N0 1.8 6146 31.34 600 3.0 1 12 15 6647
CX-B6-N0 1.8 6146 31.34 277 6.5 1 12 15 6991
CX-C2-N0 3.6 12292 31.34 208 17.3 1 12 20 6648
CX-C3-N0 3.6 12292 31.34 240 15.0 1 12 20 6649
CX-C4-N0 3.6 12292 31.34 480 7.5 1 12 15 6650
CX-C5-N0 3.6 12292 31.34 600 6.0 1 12 15 6651
CX-C6-N0 3.6 12292 31.34 277 13.0 1 12 15 6992
CX-D2-N0 4.8 16389 49.45 208 23.1 1 8 25 6652
CX-D3-N0 4.8 16389 49.45 240 20.0 1 10 25 6653
CX-D4-N0 4.8 16389 49.45 480 10.0 1 12 15 6654
CX-D5-N0 4.8 16389 49.45 600 8.0 1 12 15 6655
CX-D6-N0 4.8 16389 49.45 277 17.3 1 12 20 6993
CX-E2-N0 7.6 25950 59.49 208 36.5 1 8 40 6656
CX-E3-N0 7.6 25950 59.49 240 31.7 1 8 35 6657
CX-E4-N0 7.6 25950 59.49 480 15.8 1 10 20 6658
CX-E5-N0 7.6 25950 59.49 600 12.7 1 12 15 6659
CX-E6-N0 7.6 25950 59.49 277 27.4 1 8 30 6994
WITH BUILT-IN XCT THERMOSTAT Temp Code Rating=T2A 280°C (536°F)

CX-A1-B1 1.2 4097 31.34 120 10.0 1 12 15 6638

CX-A2-B2 1.2 4097 31.34 208 5.8 1 12 15 6639
CX-A3-B3 1.2 4097 31.34 240 5.0 1 12 15 6640
CX-A4-B4 1.2 4097 31.34 480 2.5 1 12 15 6641
CX-A6-B6 1.2 4097 31.34 277 4.3 1 12 15 6990
CX-B1-B1 1.8 6146 31.34 120 15.0 1 12 20 6643
CX-B2-B2 1.8 6146 31.34 208 8.7 1 12 15 6644
CX-B3-B3 1.8 6146 31.34 240 7.5 1 12 15 6645
CX-B4-B4 1.8 6146 31.34 480 3.8 1 12 15 6646
CX-B6-B6 1.8 6146 31.34 277 6.5 1 12 15 6991
CX-C2-B2 3.6 12292 31.34 208 17.3 1 12 20 6648
CX-C3-B3 3.6 12292 31.34 240 15.0 1 12 20 6649
CX-C4-B4 3.6 12292 31.34 480 7.5 1 12 15 6650
CX-C6-B6 3.6 12292 31.34 277 13.0 1 12 15 6992
CX-D3-B3 4.8 16389 49.45 240 20.0 1 10 25 6653
CX-D4-B4 4.8 16389 49.45 480 10.0 1 12 15 6654
CX-D6-B6 4.8 16389 49.45 277 17.3 1 12 20 6993
CX-E4-B4 7.6 25950 59.49 480 15.8 1 10 20 6658
* Or equivalent breaker as per Local Electrical Inspection Authority Requirements.
NOTES:
1. Heater is functioning normally if at rated voltage, the amp draw is within 10% of the value in this table.
2. Operation at lower voltages than rated will result in reduced output and amp draw.
Actual Ouptut (kW) = [(Supply Voltage)2 ÷ (Rated Voltage)2] x Rated Unit Wattage (kW)
3. Supply conductors are rated for 90°C (194°F).

–8–
Notes

–9–
 LIMITED 1 YEAR WARRANTY
Electric Convection Air Heaters for Hazardous Locations are warranted against defects in
materials and workmanship for a period of one (1) year from date of purchase on the following
terms:
1. We will provide replacement parts free of charge as necessary to restore any unit to
operating condition provided that the inoperative parts be returned to us freight prepaid and
that the replacement parts be accepted freight collect.
2. Complete heaters may be returned to our plant for repair or replacement (at our discretion),
provided that all related freight costs be borne by the customer.
3. Corrosion and contamination by dirt, dust, etc. will not be considered as defects and
therefore are not warrantable.
4. The heaters must not be modified in any way.
5. The heaters must be installed, stored and used only in accordance with the owner’s manual
and placarded information.
This warranty shall be limited to the actual equipment involved and
under no circumstances shall include or extend to installation or removal costs,
or to consequential losses or damages.

PLEASE ADHERE TO INSTRUCTIONS PUBLISHED IN THIS MANUAL.

Failure to do so may be dangerous and may void certain provisions of your warranty.
For further assistance, please call:

24 hr. Hotline: 1-800-661-8561

(U.S.A. and Canada)

Please have model and serial numbers available before calling.

2827 Sunridge Blvd. N.E.

Calgary, Alberta T1Y 6G1
Canada
Phone: (403) 291-5488
Fax: (403) 291-7042
www.ruffneck.com
Service E-Mail: service@ruffneck.com

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