Ruffneck FX4 Series Guide

FX 4 - 480 3 60 - 350
KILOWATT RATING
HERTZ
PHASE
VOLTAGE
4th GENERATION
MODEL SERIES
MODEL CODING
Approved Locations
The Electric Forced Air Heaters are UL listed and/or CSA certified for the following locations:
Class I, Divisions 1 & 2, Groups C & D; Class II, Division 1, Groups E, F, & G; Class II, Division 2 ,
Groups F & G; Class I, Zones 1 & 2, Groups IIA & IIB; Temperature Code T3B 165˚C (329˚F)
(50 Hz & 60 Hz Models)
For details of hazardous locations with potential for explosion, refer to the Canadian Electrical Code,
Part 1, Section 18 or National Electrical Code articles 500-516.
®
WARNING! Read all important information notices.
Ruffneck™ and VacuCore®are registered trademarks of Thermon Heating Systems Inc.
Copyright©2018. All rights reserved.
Part No.5031.Rev.15.06 August 2018 Printed in Canada
ISO 9001
FX4 Series
Electric Forced Air Heaters for Hazardous Locations
Installation, Operation, & Maintenance Instructions

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HEATER MAINTENANCE CHECKLIST
For Electric Forced Air Heaters
Heater Model: _________________________ Serial No.: ___________________________
Date of Maintenance: ___________________ Maintenance Done By: _________________
Comments: _________________________________________________________________
__________________________________________________________________________
WARNING
Disconnect heater from power supply at fuse box 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.
PERIODIC (before and as required during heating season)
1. CLEAN □Finned Tubes 2. CHECK □Motor for smooth, quiet operation
□Fan □Louvers for proper angle and tightness
□Fan Guard □All explosion-proof covers for tightness
□Motor □ Pressure relief device for signs of
□Louvers leakage. See Figure 1 and refer to the
ANNUAL Section (see below) item 2 for
further instructions.
Remove dust using compressed air. Do not spray with water or solvents.
Do not immerse in water or solvents.
ANNUAL (before heating season)
1. ELECTRICAL
□Check all terminal connections and conductors. Tighten loose connections. Conductors with damaged
insulation must be replaced.
□Inspect contactor contacts. If badly pitted, burned or welded shut, replace with factory supplied contactor. For
severe duty conditions such as arctic duty, Thermon Heating Systems recommends the contactor be replaced
every two years.
□Check fuses. Fuse rating and type are on printed circuit board. Correct fuse must be in the active fuse clip. It is
recommended that a spare fuse be stored in the spare fuse clip.
□Check all explosion-proof conduits. Replace damaged conduits. All threaded conduit connections must have
a minimum 5 turns engagement. Straight threaded conduit must protrude a minimum of 1/16” (1.6mm) inside
enclosures. Taper threaded connections must be at least hand tight.
□Check electrical resistance on all load side legs. Reading should be balanced (± 5%).
2. MECHANICAL
□Check for fluid leakage. The heater core is vacuum charged and contains propylene glycol. Inspect the
Pressure Relief Valve label indicator for signs of rupture and degradation. If the paper is torn, disintegrated or
otherwise compromised this is an indication that fluid has leaked from the core. If any fluid leakage occurs from
the heater, disconnect it from the power supply and have the core replaced. A factory supplied exchange core
can be shipped immediately from stock. Refer to the "repair and Replacement" section for details.
□Check all enclosures. Interior of enclosures must be clean, dry and free of foreign materials. Threaded covers
must be installed and hand tight.
Note: Enclosure joints are metal to metal. Do not use gasket material or sealant in joints. A grease is applied to
the joints at the factory and should be left intact.
□Check motor shaft bearing play. Replace motor if play is excessive, or if motor does not run quietly and
smoothly. Motor bearings are permanently lubricated.
□Check fan. Replace immediately if cracked or damaged.
□Check louvers. Louver screws should be tight. Louvers shall not be fully closed or override stops.
Photocopy
this page
for reuse.
For assistance, please call
Toll Free: 1-800-661-8529 (24 hrs)
U.S. & Canada

- 3 -
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.
2. Heater is to be used only in atmospheres having an
ignition temperature higher than the heater’s maximum
rated operating temperature as shown on the heater data
plate. Refer to applicable electrical codes for additional
information.
3. Heater to be used only in the hazardous locations
indicated on the heater’s data plate.
4. Heater is for dry indoor use only. Do not immerse in
water. Do not store or use in areas exposed to rain or snow.
5. Heater is to be connected and serviced only by a qualified
electrician experienced with hazardous location equipment.
6. Installation and wiring of the heater must adhere to all
applicable codes.
7. Disconnect heater from power supply at integral
disconnect or fuse box before opening enclosures or
servicing heater. Lock the switch in the “OFF” (open)
position and/or tag the switch to prevent unexpected
power application.
8. This heater is equipped with a single bimetal
overtemperature high-limit. It is of the automatic reset
type and therefore the heater may restart without warning.
The heater is not to be operated with the high-limit disabled
or disconnected from the control circuit.
9. Venting pressure of the pressure relief valve is factory set.
Do not tamper with lock nut.
10. Do not tamper or remove warning label indicator on the PRV
(figure 1).
11. Operate the heater only while it is permanently mounted in
an upright position. Refer to the “Installation - Mechanical”
section for details.
12. Heater must be kept clean. When operating in a dirty
environment, regularly clean the finned tubes, fan, and fan
guard. Follow the recommended maintenance procedures.
Refer to the “Heater Maintenance Checklist” section for
details.
13. The heater core is vacuum charged and contains propylene
glycol. If any fluid leakage occurs from the heater,
disconnect it from the power supply and have the core
replaced with a factory supplied core. Refer to the
“Repair and Replacement” section for details.
14. Do not operate the heater with any of the louvers fully closed
or overriding their stops.
15. Do not operate the heater in atmospheres corrosive to steel
or aluminum.
16. Do not operate heater in ambient temperatures above 40°C
(104°F).
17. Use factory approved replacement parts only.
18. See applicable electrical codes for seal requirements in
field installed conduits. Factory installed conduits require no
further sealing.
19. Crackling or pinging noises within the heater core during
start up may occur. This is normal.
20. Air discharge near the bottom of the heater may be warmer
than the top. This is normal.
21. If there are any questions or concerns regarding the heater,
contact the factory. Refer to the last page of this manual for
details.
IMPORTANT NOTICES
FIGURE 1
PRV PRV LOCK NUT
PRESSURE RELIEF
VALVE (PRV) LABEL
INDICATOR
□Check the tightness of all hardware. All nuts and bolts, including mounting hardware, must be tight.
□Turn heater on for a minimum of five minutes. Check for warm air exiting heater through louvers. Crackling
or pinging noises within heater during start-up are normal.
ANNUAL (Continued)
Photocopy
this page
for reuse.

- 4 -
MOUNTING
1. The heater must be permanently mounted in a level,
upright position for operation. See Figures 2, 3, and
4 for maximum tilt angles, installation clearances,
and physical dimensions. For ease of installation,
a variety of mounting kits are available from the
factory.
2. The mounting structure must be strong enough to:
a. support the heater’s weight, refer to the
“Specifications” section,
b. provide sufficient stiffness to prevent excessive
vibration, and
c. withstand harsh situations such as transportable
installations.
FIGURE 5
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
i
HEATER LOCATIONS
EXTERIOR WALL
EXTERIOR
WALL
FIGURE 2
LOCATION
For optimum heating, the heater should be installed as follows:
1. There are no obstructions that may impede the heater’s air
inlet or discharge.
2. The air discharge is directed into open areas and not at
occupants.
3. The air discharge is not directed at a thermostat.
4. The air discharge is directed across areas of heat loss, such
as doors and windows (see Figure 1).
5. The air discharge is directed along and at a slight angle
toward exterior walls (see Figure 1).
6. If equipment freeze protection is important, direct air
discharge at equipment.
7. Air discharge streams support each other and create a
circular air flow. It is not required that the heater’s air throw
reaches the next heater (see Figure 1).
FIGURE 3
FIGURE 4
5
DIM. 2.5 - 9.3 12.5 - 18.5 20.9 - 23.1
DIM.
TOL.
±
Ain 8 - 1/16 6 - 11/16 7 - 1/16 1/8
mm 204 170 179 3
Bin 8 - 3/16 22 -3/16 26 - 3/16 1/8
mm 462 564 665 3
Cin 24 - 5/8 28 - 5/8 32 - 5/8 5/16
mm 625 727 828 8
Din 18 - 1/2 22 - 1/2 26 - 1/2 1/8
mm 470 572 674 3
Ein 19 - 7/16 23 - 7/16 27 - 7/16 1/8
mm 494 596 697 3
kW
DIMENSIONAL TOLERANCES ± 0.118” (3 mm)
UNLESS OTHERWISE SPECIFIED.
M32 OR M25 ADAPTORS
(FOR FIELD WIRING)
E
D
7.4 ± 0.4” (189 ± 10 mm)
1.5” (38 mm) MAX.
15.7 ± 0.2”
(400 ± 5 mm)
17.2 ± 0.2”
(436 ± 5 mm)
3 ± 0.2”
(75 ± 6 mm)
B
C
0.6” (16 mm)
10.4 ± 0.2”
(263 ± 5 mm)
22.6”
(575 mm)
MAX.
Ø0.6” (Ø14.3 mm)
MOUNTING HOLE
(2 PLCS) A

- 5 -
WARNING
Disconnect heater from power supply at fuse box before opening enclosures or servicing heater. Lock the switch in the
"OFF" (open) position and/or tag the switch to prevent unexpected power application.
GENERAL
1. Use only copper conductors and approved explosion-proof wiring
methods during installation. Refer to the “Technical Data” table and
heater data plate for conductor rating.
2. External overcurrent protection is required. Refer to the “Technical Data”
table and heater data plate for voltage, frequency amperage, and phase
Supply voltage is to be within 10% of the data plate voltage.
3. The heater must be installed by qualified personnel in strict compliance
with the electrical code.
4. All heaters come factory prewired and ready for direct connection to the
power supply leads.
5. Heater control box may be supplied with two 1"-11.5 NPT conduit entries
for field wiring. All unused openings shall be closed off with supplied
conduit plug.
6. The heater must be individually fused, preferably with Class J time-delay
fuses for maximum safety. Unless stated otherwise in your local code,
fuse size shall be 125% of the line current or next size larger.
FIELD WIRING
1. The supply conductors, ground conductor, and room thermostat
conductors (see point 2, page 4) all pass through the 1” NPT opening
(see Figure 4) and are to be wired into the control enclosure (see Figure
5 ).
2. Heater may be supplied with a factory installed built-in room thermostat
On heaters not supplied with this option, it is recommended that a
remote room thermostat be used. Connect the remote room thermostat
conductors to the printed circuit board terminal block marked “TSTAT”.
Any thermostat used with this heater must:
a. be of an explosion-proof type,
b. be rated 125 V minimum,
c. have a minimum 2 amp capacity, and
d. open on temperature rise.
ELECTRICAL
FINAL INSPECTION
1. Before application of electrical power:
a. Check that all connections are secured and comply with
the applicable wiring diagram (see Figure 7) and code
requirements,
b. Confirm that the power supply is compatible with the data
plate rating of the heater,
c. Remove any foreign objects from the heater,
d. Install all covers and verify that all enclosures are well
secured, and
e. Ensure that the fan rotates freely. See Figure 5 for proper
direction of fan rotation.
FIGURE 6
Do not install conduit below heater (see Figure 5).
FIGURE 7

- 6 -
FX4 TECHNICAL DATA FOR 50 HZ ELECTRIC AIR HEATERS
NOTES:
1. Minimum conductor size for 30˚C (86˚F) ambient. Derate conductor for ambient temperature. Use minimum 90˚C (194˚F) insulation.
2. Heater is functioning normally if at rated voltage the amp draw is within 10% of the value in this table.
3. Operation at lower voltages will result in reduced heat output and amp draw
4. Add “T” to model number when adding a built-in thermostat
MODEL
VOLT-
AGE
NOMINAL
WATTAGE
PHASE
MAX. MOTOR
NAMEPLATE
CURRENT
HEATER
WATTAGE
TOTAL
CURRENT
MIN. CIRCUIT
AMPACITY
SUPPLY
WIRE SIZE
MAXIMUM
FUSE SIZE
TEMPERATURE
RISE CORE
PART
NUMBER
CONTACTOR
PART
NUMBER
(V) (kW) (A) (W) (A) (A) (AWG) (A) °F °C
FX4-220150-025 220 2.5 12.0 2,270 11.4 14.3 14 15 19.7 11.0 10410 3618
FX4-220150-042 220 4.2 1 2.0 3,950 19.1 23.9 10 25 33.2 18.4 10411 3618
FX4-220150-063 220 6.3 12.0 6,050 28.6 35.8 8 40 28.4 15.8 10412 3618
FX4-220150-084 220 8.4 12.0 8,140 38.2 47.8 6 50 37.9 21.1 10413 3618
FX4-220150-126 220 12.6 12.0 12,100 57.3 71.6 4 80 27.5 15.3 10424 3618
FX4-380350-025 380 2.5 30.7 2,260 3.8 4.8 14 15 19.7 11.0 10410 3618
FX4-380350-042 380 4.2 3 0.7 3,930 6.4 8.0 14 15 33.2 18.4 10411 3618
FX4-380350-063 380 6.3 3 0.7 6,020 9.6 12.0 14 15 28.4 15.8 10412 3618
FX4-380350-084 380 8.4 3 0.7 8,100 12.8 16.0 12 20 37.9 21.1 10413 3618
FX4-380350-125 380 12.5 3 0.7 12,030 19.0 23.8 10 25 27.2 15.1 10424 3618
FX4-380350-167 380 16.7 3 0.7 16,220 25.4 31.8 8 35 36.4 20.2 10425 3618
FX4-380350-209 380 20.9 31.0 20,230 31.8 39.8 8 40 22.0 12.2 10429 3618
FX4-415350-037 415 3.7 30.7 3,510 5.1 6.4 14 15 29.2 16.2 10415 3618
FX4-415350-075 415 7.5 3 0.7 7,240 10.4 13.0 14 15 33.9 18.8 10417 3618
FX4-415350-149 415 14.9 3 0.7 14,510 20.7 25.9 10 30 32.5 18.0 10218 3618
FX4-415350-224 415 22.4 31.0 21,820 31.2 39.0 8 40 23.6 13.1 10431 3618
®
FIGURE 8
WIRING DIAGRAMS

- 7 -
FX4 TECHNICAL DATA FOR 60 HZ ELECTRIC AIR HEATERS
NOTES: * - CSA Certied Only **-Exceeds the 48 Amp circuit limit of NEC 424-22
1. Minimum conductor size for 30˚C (86˚F) ambient. Derate conductor for ambient temperature. Use minimum 90˚C (194˚F) insulation.
2. Heater is functioning normally if at rated voltage the amp draw is within 10% of the value in this table.
3. Operation at lower voltages will result in reduced heat output and amp draw
4. Add “T” to model number when adding a built-in thermostat
MODEL
Note
VOLT-
AGE
NOMINAL
WATTAGE
PHASE
MAX. MOTOR
NAMEPLATE
CURRENT
HEATER
WATTAGE
TOTAL
CURRENT
MIN. CIRCUIT
AMPACITY
SUPPLY
WIRE SIZE
MAXIMUM
FUSE SIZE
TEMPERATURE
RISE CORE PART
NUMBER
CONTACTOR
PART
NUMBER
(V) (kW) (A) (W) (A) (A) (AWG) (A) °F °C
FX4-208160-030 208 3 1 2.7 2,700 14.4 18.0 12 20 19.0 10.5 10406 3618
FX4-208360-030 208 3 3 1.4 2,700 8.3 10.4 14 15 19.0 10.5 10406 3618
FX4-240160-030 240 3 1 2.7 2,700 12.5 15.6 12 20 19.0 10.5 10410 3618
FX4-240360-030 240 3 3 1.4 2,700 7.2 9.0 14 15 19.0 10.5 10410 3618
FX4-480160-030 * 480 3 1 1.3 2,700 6.3 7.9 14 15 19.0 10.5 10414 3618
FX4-480360-030 480 3 3 0.7 2,700 3.6 4.5 14 15 19.0 10.5 10414 3618
FX4-600360-030 * 600 3 3 0.6 2,700 2.9 3.6 14 15 19.0 10.5 10418 3618
FX4-208160-050 208 5 1 2.7 4,700 24.0 30.0 10 30 31.6 17.6 10407 3618
FX4-208360-050 208 5 3 1.4 4,700 13.8 17.4 12 20 31.6 17.6 10407 3618
FX4-240160-050 240 5 1 2.7 4,700 20.8 26.0 10 30 31.6 17.6 10411 3618
FX4-240360-050 240 5 3 1.4 4,700 12.0 15.0 14 15 31.6 17.6 10411 3618
FX4-480160-050 * 480 5 1 1.3 4,700 10.4 13.0 14 15 31.6 17.6 10415 3618
FX4-480360-050 480 5 3 0.7 4,700 6.0 7.5 14 15 31.6 17.6 10415 3618
FX4-600360-050 * 600 5 3 0.6 4,700 4.8 6.0 14 15 31.6 17.6 10419 3618
FX4-208160-075 208 7.5 1 2.7 7,200 36.1 45.1 6 50 27.9 15.5 10408 3619
FX4-208360-075 208 7.5 3 1.4 7,200 20.8 26.0 10 30 27.9 15.5 10408 3618
FX4-240160-075 240 7.5 1 2.7 7,200 31.3 39.1 8 40 27.9 15.5 10412 3618
FX4-240360-075 240 7.5 3 1.4 7,200 18.0 22.5 10 25 27.9 15.5 10412 3618
FX4-480160-075 * 480 7.5 1 1.3 7,200 15.6 19.5 12 20 27.9 15.5 10416 3618
FX4-480360-075 480 7.5 3 0.7 7,200 9.0 11.3 14 15 27.9 15.5 10416 3618
FX4-600360-075 * 600 7.5 3 0.6 7,200 7.2 9.0 14 15 27.9 15.5 10420 3618
FX4-208160-100 ** 208 10 1 2.7 9,690 48.1 60.1 4 70 37.2 20.6 10409 3619
FX4-208360-100 208 10 3 1.4 9,690 27.8 34.8 8 35 37.2 20.6 10409 3618
FX4-240160-100 240 10 1 2.7 9,690 41.7 52.1 6 60 37.2 20.6 10413 3619
FX4-240360-100 240 10 3 1.4 9,690 24.1 30.1 8 35 37.2 20.6 10413 3618
FX4-480160-100 * 480 10 1 1.3 9,690 20.8 26.0 10 30 37.2 20.6 10417 3618
FX4-480360-100 480 10 3 0.7 9,690 12.0 15.0 14 15 37.2 20.6 10417 3618
FX4-600360-100 * 600 10 3 0.6 9,690 9.6 12.0 14 15 37.2 20.6 10421 3618
FX4-208360-150 208 15 3 1.4 14,400 41.6 52.0 6 60 27.1 15.0 10422 3619
FX4-240160-150 ** 240 15 1 2.7 14,400 62.5 78.1 4 80 27.1 15.0 10424 3619
FX4-240360-150 240 15 3 1.4 14,400 36.1 45.1 6 50 27.1 15.0 10424 3619
FX4-480160-150 * 480 15 1 1.3 14,400 31.3 39.1 8 40 27.1 15.0 10426 3618
FX4-480360-150 480 15 3 0.7 14,400 18.0 22.5 10 25 27.1 15.0 10426 3618
FX4-600360-150 * 600 15 3 0.6 14,400 14.4 18.0 12 20 27.1 15.0 10427 3618
FX4-208360-200 ** 208 20 3 1.4 19,410 55.5 69.4 4 70 36.1 20.1 10423 3619
FX4-240360-200 ** 240 20 3 1.4 19,410 48.1 60.1 4 70 36.1 20.1 10425 3619
FX4-480160-200 * 480 20 1 1.3 19,410 41.7 52.1 6 60 36.1 20.1 10218 3619
FX4-480360-200 480 20 3 0.7 19,410 24.1 30.1 8 35 36.1 20.1 10218 3618
FX4-600360-200 * 600 20 3 0.6 19,410 19.2 24.0 10 25 36.1 20.1 10428 3618
FX4-240360-250 ** 240 25 3 2.0 24,210 60.1 75.1 4 80 21.9 12.2 10429 3619
FX4-480360-250 480 25 3 1.0 24,210 30.1 37.6 8 40 21.9 12.2 10430 3618
FX4-600360-250 * 600 25 3 0.8 24,210 24.1 30.1 8 35 21.9 12.2 10433 3618
FX4-480360-300 480 30 3 1.0 29,190 36.1 45.1 6 50 26.3 14.6 10431 3619
FX4-600360-300 * 600 30 3 0.8 29,190 28.9 36.1 8 40 26.3 14.6 10434 3618
FX4-480360-350 480 35 3 1.0 34,200 42.1 52.6 6 60 28.0 15.6 10432 3619
FX4-600360-350 * 600 35 3 0.8 34,200 33.7 42.1 8 45 28.0 15.6 10435 3619
®

- 8 -
SPECIFICATIONS FOR ALL 60 Hz MODEL
kW 3 5 7.5 10 15 20 25 30 35
Max. Altitude (ft.) 12,000 8,000 10,000 7,000 10,000 7,000 10,000 7,000 6,000
(m) 3,658 2,438 3,048 2,134 3,048 2,134 3,048 2,134 1,829
Air Flow @70°F
@21°C
(CFM) 500 850 1750 3600 3950
(m3/hr.) 850 1444 2973 6116 6711
Horizontal Air Throw (ft.) 15 30 40 70
(m) 4.6 9.1 12.2 21.3
Max. Mounting Height
(to underside)
(ft.) 7 10 10 20
(m) 2.1 3.0 3.0 6.1
Motor Power (HP) 1/2 1/2 1/2
(kW) 0.373 0.373 0.373
Fan Diameter (in.) 12 16 20
(mm) 305 406 508
Net Weight (lbs.) 131 153 192
(kg) 59.5 69.5 87.3
Shipping Weight (lbs.) 180 202 241
(kg) 81.8 91.8 109.5
Temperature Code Rating T3B 165°C (329°F) Class I & II.
Enclosures NEMA Type 7 & 9. For dry, indoor use only. Do not immerse in water. Do not store or
use in areas exposed to rain or snow.
Motor Type Explosion-proof. Thermally protected. Permanently lubricated ball bearings. 1725 RPM
Fan Aluminum blade, Steel spider and hub with 5/8 in. (15.875 mm) bore.
Fan Guard Split design with close wire spacing. 1/4 in. (6.3 mm) dia. probe will not enter
Mounting Holes Two 9/16 in. (14.3 mm) diameter holes at top of heater.
Heating Elements Three long-life, low watt-density, high grade metal-sheathed elements.
Temperature High-Limit Automatic reset type, snap-action bimetal, open on temperature rise. Rated 100,000
cycles at 10 amps, handles 0.128 amps.
Control Circuit 120 Volts, 0.128 amps, 15VA. (Grounded)
Optional Built-in Thermostat Explosion-proof. 2°C to 28°C (36°F to 82°F)
Control Transformer Multi-tap primary, 120 V secondary, 25 VA.
Contactor 40 or 75 amp. Rated for 500,000 mechanical operations. 120 Volts, 15VA coil
(separately fuse-protected).
Heat Transfer Fluid Long life formulated propylene glycol and water.
Cabinet Material 14 ga. (0.075 in.) (1.9 mm) steel. Epoxy coated with ve-stage pretreatment
Core Steel with integral aluminum ns, vacuum charged and hermetically sealed.
Conduit Material Heavy walled, 0.122 in. (3.1 mm) steel.
Overpressure Protection Preset 100 psig (690 kPa) seep pressure relief valve, aluminum body, no eld
serviceable parts
Operational Temperature Limitations -20°C to 40°C (-4°F to 104°F)
Storage Limitations -45°C to 80°C (-49°F to 176°F), short term to 120°C (248°F). Do not immerse in water.
Do not expose to rain or snow.

- 9 -
SPECIFICATIONS FOR ALL 50 Hz MODEL
kW 2.5 3.7&4.2 6.3&7.5 8.4 12.5&12.6 14.9&16.7 20.9 22.4
Max. Altitude (ft.) 12,000 8,000 10,000 7,000 10,000 7,000 10,000 7,000
(m) 3,658 2,438 3,048 2,134 3,048 2,134 3,048 2,134
Air Flow @70°F
@21°C
(CFM) 400 700 1450 3000
(m3/hr.) 679 1189 2463 5096
Horizontal Air Throw (ft.) 13 25 35 60
(m) 4.0 7.6 10.7 18.2
Max. Mounting Height
(to underside)
(ft.) 7 10 10 20
(m) 2.1 3.0 3.0 6.1
Motor Power (HP) 1/2 1/2 1/2
(kW) 0.373 0.373 0.373
Fan Diameter (in.) 12 16 20
(mm) 305 406 508
Net Weight (lbs.) 131 153 192
(kg) 59.5 69.5 87.3
Shipping Weight (lbs.) 180 202 241
(kg) 81.8 91.8 109.5
Temperature Code Rating T3B 165°C (329°F) Class I & II
Enclosures NEMA Type 7 & 9. For dry, indoor use only. Do not immerse in water. Do not store or use in areas
exposed to rain or snow.
Motor Type Explosion-proof. Thermally protected Permanently lubricated ball bearings. 1425 RPM.
Fan Aluminum blade. Steel spider and hub with 5/8 in. (15.875 mm) bore.
Fan Guard Split design with close wire spacing. 1/4 in. (6.3 mm) dia. probe will not enter.
Mounting Holes Two 9/16 in. (14.3 mm) diameter holes at top of heater.
Heating Elements Three long-life, low watt-density, high grade metal-sheathed elements.
Temperature High-Limit Automatic reset type, snap-action bimetal, open on temperature rise. Rated 100,000 cycles at 10
amps, handles 0.130 amps.
Control Circuit 115 Volts, 0.130 amps, 15VA. (Grounded)
Optional Built-in Thermostat Explosion-proof. 2°C to 28°C (36°F to 82°F)
Control Transformer Multi-tap primary, 115 V secondary, 25 VA.
Contactor 40 or 75 amp. Rated for 500,000 mechanical operations. 120 Volts, 15VA coil (separately fuse-
protected).
Heat Transfer Fluid Long life formulated propylene glycol and water.
Cabinet Material 14 ga. (0.075 in.) (1.90 mm) steel. Epoxy coated with ve-stage pretreatment, including iron
phosphate.
Core Steel with integral aluminum ns, vacuum charged and hermetically sealed.
Conduit Material Heavy walled, 0.1222 in. (3.1 mm) steel.
Overpressure Protection Preset 100 psig (690 kPa) seep pressure relief valve, aluminum body, no eld servicable parts.
Operational Temperature Limitations -20°C to 40°C (-4°F to 104°F)
Storage Limitations -45°C to 80°C (-49°F to 176°F), short term to 120°C (248°F). Do not immerse in water. Do not store
or use areas exposed to rain or snow.

- 10 -
- 10 -
See control
enclosure
assembly
diagram (below)
See high-limit
assembly diagram
(below)
HEATER ASSEMBLY DIAGRAM
35
36
34
35
34
35
36
CONTROL ENCLOSURE
ASSEMBLY DIAGRAM
HIGH LIMIT
ASSEMBLY DIAGRAM
Optional built-in
thermostat replaces
item #16
1
4
22
23
24
5
6
7
8
9
10
11
12
13
14 15
16
17
2
9
19
20
21
25
26
30
31
32
27
28
29
3
18
33
BUS-BAR CONFIGURATION
ALL 1-PHASE MODELS
BUS-BAR CONFIGURATION
ALL 3-PHASE 60 HERTZ & 3-PHASE 50 HERTZ 415
VOLT MODEL
BUS-BAR CONFIGURATION
3-PHASE 380 VOLT 50 HERTZ MODELS ONLY

- 11 -
PARTS LIST
FORCED AIR ELECTRIC HEATERS
PART NUMBERS Please have model and serial number
available before calling.
ITEM 2.5 - 10 kW 12.5 - 20 kW 20.9 - 35 kW Description
1 – – – Core
2 3773 3774 3775 Panel, Bottom
3 3776 3777 3778 Panel, Left Side
4 4075 4076 4077 Louver Kit, c/w Screws
5 3770 3771 3772 Panel, Top
6 3779 3780 3781 Panel, Right Side
7 3782 3783 3784 Fan Shroud
82.5 - 5 kW: 4022
6.3 - 10 kW: 4023 4024 4025 Fan
9 4078 4079 4080 Fan Guard Kit
10
208/240V 60 HZ 1 PH: 1979/10388
220V 50 HZ 1 PH: 1979/10388
480V 60 HZ 1 PH: 9896
208/240/480V 60 HZ 3 PH: 1699/10387
380/415V 50HZ 3 PH: 1699
240/480V 60 HZ 3 PH:
1699
380/415V 50 HZ 3 PH:
1699
600V 60 HZ 3 PH:
2433/10672
Motor, Explosion-Proof
11 3789 3789 3789 Bracket, Motor Mount Right
12 3785 3786 3787 Channel, Motor Mount
13 3788 3788 3788 Bracket, Motor Mount Left
14 3737/4590 3737/4590 3737/4590 Coupling, Motor
15 3811 3812 3813 Conduit, Motor
16 4983 4983 4983 Enclosure, Conduit Junction
17
208/240V 60 HZ 1 PH: 3813
220V 50 HZ 1 PH: 3813
480V 60 HZ 1 PH: 3813
ALL 3 PH: 3813
3813 Conduit, Control Enclosure
18 3810 3810 3810 Conduit, Element Enclosure
19 3793 3793 3793 Enclosure, Element
20 3510 3510 3510 Cover, Element Enclosure
21 3790 3790 3790 Panel, Element Enclosure guard
22 4983 4983 4983 Enclosure, Thermostat
23 5032 5032 5032 Thermostat, Built-in Kit
24 3524 3525 3526 Enclosure, Control
25 10557 10557 10557 Contactor
26 10556 10556 10556 Transformer
27 3809 3809 3809 Bracket, Printed Cuircuit Board
28 1876 1876 1876 Terminal, 6-14 ga. Screw Lug
29 3519 3519 3519 Fuse, Buss MDQ-1/4 Amp
30 3514 3514 3514 Printed Circuit Board Assembly
31 3516 3516 3516 Cover, Control Enclosure
32 4082 4082 4082 Temperature High-Limit Kit
33 3816 3816 3816 Bus-Bar, Straight
34 3817 3817 3817 Bus-Bar, Small Curved
35 3818 3818 3818 Bus-Bar, Large Curved

- 12 -
REPAIR & REPLACEMENT
1. After repairing any component:
a. check that electrical connections are correct and secure (see Figure 8),
b. remove any foreign material from enclosures,
c. install and secure all covers,
d. ensure that all fasteners are tight,
e. remove all foreign objects from heater, and
f. ensure air exits through louvers and fan rotates counterclockwise when
viewed from rear of heater (see Figure 13).
CORE
The heater core is vacuum charged and not field repairable.
For core removal:
1. Remove cabinet bottom and element enclosure cover.
2. Disconnect all wires entering element enclosure (see Figure 9).
3. Slightly loosen all cabinet bolts shown in Figure 9, to prevent the core
from binding.
4. With an assistant supporting the weight of the core, remove the 3 core
mounting bolts. Carefully lower the core out of the cabinet (see Figure
10).
5. To return core to factory, use crate supplied with exchange core to protect
the element terminals and plate threads.
6. To reinstall, lift the core up into cabinet while an assistant guides the
element wires into the element enclosure conduit.
7. Position the core and tighten the 3 core mounting bolts. Tighten the
remaining cabinet bolts.
TEMPERATURE HIGH-LIMIT
1. Remove temperature high-limit assembly and clean the inside of the
thermowell (see Figure 11). A clean thermowell will ensure good thermal
contact.
2. Use only a factory supplied temperature high-limit to ensure safe operation.
(refer to the instructions that accompany the replacement Temperature
High-Limit kit).
3. Reinstall the temperature high-limit assembly with the snap ring and spring
into the thermowell without damaging the insulating tube. Secure in place
with the cotter pin (see Figure 12).
MOTOR, FAN & FAN GUARD
1. Remove bolts holding the motor to the motor mount. On units with a built
in thermostat, remove the bolts on the back of the thermostat enclosure.
2. Remove conduit #1 located between motor junction box and control
enclosure by turning it in the direction illustrated (see Figure 13).
Note conduits #1 and #2 are not interchangeable and have left hand threads on
one end, this end is indicated by a machined groove.
3. Remove the 2 piece fan guard assembly (see Figure 14).
4. Lift the motor assembly off the motor mount.
5. Before removing the fan, measure and record the location of the fan hub on the
motor shaft (see Figure 15). If difficult to remove, use a gear puller on the fan hub.
6. To reassemble, place motor assembly onto motor mount and fasten the fan guard
to cabinet.
7. Simultaneously engage and tighten both ends of conduit #1 into enclosures.
Leave a 1/16” to 3/16” (1.6 to 4.8 mm) gap between the motor and fan guard (see
Figure 16). Adjust conduit #2 to center the fan in the shroud.
8. To ensure a minimum 5 thread engagement, threaded ends of conduits must
protrude a minimum of 1/16” (1.6mm) into enclosures. The groove on conduit #2
must not be more than 7/8” (22mm) from motor coupling (see Figure 13).
9. Bolt motor to motor mount. Manually spin the fan blade to ensure fan rotates freely.
10. Air must exit through louvers and fan must rotate counterclockwise when viewed
from rear of heater (see Figure 13).
FIGURE 13
FIGURE 12
FIGURE 11
FIGURE 10
FIGURE 9
3/32”
(2mm)
Drop
Thermowell
WARNING
Disconnect heater from power supply at fuse box before opening enclosures or
servicing heater. Lock the switch in the “OFF” (open) position and/or tag the switch to
prevent unexpected power application.

- 13 -
PRINTED CIRCUIT BOARD
1. After removing the printed circuit board (PCB) bracket assembly
from the control enclosure, separate the PCB from the bracket by
cutting off the plastic spacers (see Figure 17).
2. Reinstall a new factory supplied PCB onto the mounting bracket
using new non-conducting spacers of the same length. Spacers are
supplied with a new PCB. Reinstall the control circuit ground wire
to the printed circuit board bracket (see Figure 8).
CONTACTOR
1. Loosen, but do not remove contactor mounting screws. Slide contactor
off mounting screws.
2. Replace with a factory supplied contactor of the same rating.
TRANSFORMER
1. Replace with a factory supplied transformer of the same rating.
2. On the new transformer, select primary wires to match heater voltage.
Ensure that the correct transformer secondary lead is grounded (see
Figure 8). Individually terminate all unused wires using closed end
connectors.
FUSE
Replace fuse with one of the same type and rating as indicated on P.C.
Board or refer to parts list. An extra fuse should be stored in the clips
marked “SPARE”.
HEATING ELEMENTS
Heating elements are an integral part of the vacuum charged core. A factory
exchange core can be shipped immediately from stock. Refer to “Core”
section for details.
CABINET PANELS
Bolt-on cabinet panels are individually replaceable.
FIGURE 16
FIGURE 15
FIGURE 14
FIGURE 17
1/16” to 3/16”
(1.6 to 4.8mm)

- 14 -
NOTES

- 15 -
NOTES

PLEASE ADHERE TO INSTRUCTIONS IN THIS MANUAL
Failure to do so may be dangerous and may void certain provisions of
your warranty.
For further assistance, please call 24hr hotline: [phone] (U.S.A. and Canada)
Please have model and serial numbers available before calling.
Oakville
1-800-410-3131
1-905-829-4422
F 905-829-4430
Orillia
1-877-325-3473
1-705-325-3473
F 705-325-2106
WARRANTY:Under normal use the Company warrants to
the purchaser that defects in material or workmanship will be
repaired or replaced without charge for a period of 18 months
from date of shipment, or 12 months from the start date of
operation, whichever expires rst. Any claim for warranty must
be reported to the sales ofce where the product was purchased
for authorized repair or replacement within the terms of this
warranty.
Subject to State or Provincial law to the contrary, the Company
will not be responsible for any expense for installation, removal
from service, transportation, or damages of any type whatsoever,
including damages arising from lack of use, business interruptions,
or incidental or consequential damages.
The Company cannot anticipate or control the conditions of
product usage and therefore accepts no responsibility for
the safe application and suitability of its products when used
alone or in combination with other products. Tests for the
safe application and suitability of the products are the sole
responsibility of the user.
This warranty will be void if, in the judgment of the Company,
the damage, failure or defect is the result of:
• Vibration, radiation, erosion, corrosion, process
contamination, abnormal process conditions, temperature
and pressures, unusual surges or pulsation, fouling,
ordinary wear and tear, lack of maintenance, incorrectly
applied utilities such as voltage, air, gas, water, and others
or any combination of the aforementioned causes not
specically allowed for in the design conditions or,
• Any act or omission by the Purchaser, its agents, servants
or independent contractors which for greater certainty, but
not so as to limit the generality of the foregoing, includes
physical, chemical or mechanical abuse, accident,
improper installation of the product, improper storage
and handling of the product, improper application or the
misalignment of parts.
No warranty applies to paint nishes except for manufacturing defects
apparent within 30 days from the date of installation.
The Company neither assumes nor authorizes any person to assume for it
any other obligation or liability in connection with the product(s).
The Purchaser agrees that all warranty work required after the initial
commissioning of the product will be provided only if the Company
has been paid by the Purchaser in full accordance with the terms and
conditions of the contract.
The Purchaser agrees that the Company makes no warranty or
guarantee, express, implied or statutory, (including any warranty of
merchantability or warranty of tness for a particular purpose) written
or oral, of the Article or incidental labour, except as is expressed or
contained in the agreement herein.
LIABILITY: Technical data contained in the catalog or on the
website is subject to change without notice. The Company reserves
the right to make dimensional and other design changes as required.
The Purchaser acknowledges the Company shall not be obligated
to modify those articles manufactured before the formulation of the
changes in design or improvements of the products by the Company.
The Company shall not be liable to compensate or indemnify the
Purchaser, end user or any other party against any actions, claims,
liabilities, injury, loss, loss of use, loss of business, damages, indirect
or consequential damages, demands, penalties, nes, expenses
(including legal expenses), costs, obligations and causes of action of
any kind arising wholly or partly from negligence or omission of the
user or the misuse, incorrect application, unsafe application, incorrect
storage and handling, incorrect installation, lack of maintenance,
improper maintenance or improper operation of products furnished
by the Company.
Edmonton
1-780-466-3178
F 780-468-5904
5918 Roper Road
Alberta, Canada T6B 3E1
Houston
1-855-219-2101
1-281-506-2310
F 281-506-2316
Denver
1-855-244-3128
1-303-979-7339
F 303-979-7350