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