EXUB Owner’s Manual Forced-Air Heater for Hazardous Locations

EXUB  Owner’s Manual Forced-Air Heater for Hazardous Locations
EXUB
Explosion Resistant Unit Heater
Owner’s Manual
This manual covers installation, maintenance,
repair, and replacement parts.
Forced-Air Heater for Hazardous Locations
Class I, Divisions 1 & 2, Groups C & D
Class II, Divisions 1 & 2, Groups F & G
Temperature Code T3B (35 kW = T3A)
————————————————————————————————————-
Class I, Zones 1 & 2 , Groups IIA & IIB, T3
235730
WARNING!
Please adhere to all instructions published in this manual.
Failure to do so may be dangerous and may void your warranty.
Note: EXUB heaters should not be exposed to rain or snow. This applies to installed & stored heaters.
The EXUB heater should not be modified in any way.
www.RezSpec.com
Printed in Canada
Part No. RZ-I-EXUB (B)
EXUB Model Coding
Factory
Assigned
Model Code Sequence
EXUB
10
AK7E
Options
-
A
Product Revision No.
Model Series
For minor revisions
Power Output
5 kW
7.5 kW
10 kW
15 kW
20 kW
25 kW
30 kW
35 kW
5
7
10
15
20
25
30
35
Factory Built-in Options
BT1* 24 Volt Control Circuit
IX34 Integral thermostat
BAX1 Disconnect switch
12 inch fan size
12 inch fan size
12 inch fan size
16 inch fan size
16 inch fan size
20 inch fan size
Heater Line Voltage/Phase
AK2
208 Volt/ 1 Phase
AK5
208 Volt/ 3 Phase
AK3E
240 Volt/ 1 Phase
AK6E
240 Volt/ 3 Phase
AK7E
480 Volt/ 3 Phase
AK8E
600 Volt/ 3 Phase
20 inch fan size
20 inch fan size
* 120 Volt Control Circuit is standard
EXUB Physical Dimensions
G max
A
4 x Ø 9/16" [14]
mounting holes
Heater
Size
3.75"
[95]
B
0.375"
[10]
1" NPT,
Main electrical entry
for disconnect option
1" NPT,
Main electrical entry
no disconnect fitted
2.25"
[57]
8.4"
[214]
3.375"
[86]
3/4" NPT,
External thermostat
entry
5.0"
[127]
11"
[279]
6.6"
[168]
4.7"
[118]
Louvres
1.4" [36] max
12
(5-10kW)
16
20
(15-20kW) (25-35kW)
Dim.
Inches
(mm)
Inches
(mm)
Inches
(mm)
A
7.5
(190.5)
7.5
(190.5)
7.5
(190.5)
B
18.19
(462)
22.28
(566)
26.26
(667)
C
16.3
(414)
20.28
(515)
24.29
(617)
D
19
(483)
23
(584)
27
(686)
E
19.45
(494)
23.46
(596)
27.44
(697)
F
3.1
(79)
5.1
(130)
7.1
(180)
G
22.25
(565)
22.25
(565)
23.25
(591)
E
C
0.25"
[6]
F F
3.375"
[86]
D
0.25"
[6]
2
EXUB Specifications By Model Size
Model
Fan Diameter
Nominal kW
Air Delivery
5 to 10 kW
12 (304.8)
5
7.5
10
400
600
800
680
1019
1359
479
718
958
2.4
3.6
4.9
15
22
30
4.6
6.7
9.1
¼ (186)
7
7.5
9.5
2.1
2.3
2.9
129 (58.5)
133 (60.3)
142 (64.4)
146 (66.2)
in. (mm)
CFM
m3/hr
Approx. Air Velocity
FPM
m/s
Approx. Horizontal Air Throw
ft
m
Motor Power
HP (Watts)
Maximum Mounting Height
ft
(to underside of heater)
m
Approx. Net Weight
(without disconnect)
Lbs (kg)
(with disconnect)
Approx. Shipping Weight (without disconnect)
Lbs (kg)
(with disconnect)
188 (85.3)
201 (91.2)
192 (87.1)
205 (93.0)
15 to 20 kW
16 (406.4)
15
20
1200
1700
2039
2888
808
1145
4.1
5.8
33
46
10.1
14.0
¼ (186)
10
11
3.0
3.4
161 (73.0)
174 (78.9)
25 to 35 kW
20 (508.0)
35
25
30
2100
3000
3568
5097
916
1309
4.6
6.6
41
61
12.5
18.6
½ (373)
12
15
3.6
4.6
192 (87.1)
205 (92.9)
224 (101.6)
237 (107.5)
261 (118.4)
274 (124.3)
EXUB General Specifications
Certification
Approvals
North American
Hazardous Location
Classifications
Temperature Code
Cabinet Material
Fan Guard
Cabinet
Motor/Fan
Louver Blades
Conduit Materials & Fittings
Fasteners
Enclosures
Mounting Holes
Motor Type
Fan
Heating Elements
Heat
Exchanger
Heat Transfer Fluid
Header Material
ExCaliberTM Core
Protection
Temperature High Limits
Pressure Relief
Control Circuit
Control Contactor
Controls
Load
Isolation
Operating
Limits
Control Transformer
Fuse Protection
Room Thermostat (optional)
Disconnect Switch (optional)
Ambient Temperature
Maximum Altitude
CSAC/US 235730 - Certified to Canadian and U.S. standards
Class I, Divisions 1 & 2, Groups C & D
Class II, Divisions 1 & 2, Groups F & G
Temperature Code T3B (35 kW =T3A)
————————————————————————————————————————
Class I, Zones 1 & 2, Groups IIA & IIB, T3
Division System - T3B 165°C (329°F); Zone System - T3 200°C (392°F)
14-gauge (0.075 in.) (1.9 mm) steel. Red epoxy/polyester powder coated
with five-stage pretreatment, including iron phosphate.
Split design with close wire spacing. A 3/8 in. (9.5 mm)
diameter probe will not enter. Black polyester powder coated.
Anodized extruded aluminum.
Plated steel and aluminum alloy for corrosion resistance.
Zinc plated steel for corrosion resistance.
Cast aluminum (non-copper alloy) NEMA Type 7 & 9 with O-ring.
9/16” diameter holes – Four located on the top face of heater.
Explosion-proof, thermally protected, 1725 RPM permanently
lubricated
ball bearing type with 56 frame and “easy-off” fan blade replacement feature.
Three-blade aluminum, steel spider and hub with 5/8 in. bore
Long-life, low watt-density, high grade metal-sheathed
elements.
Ethylene glycol and water including corrosion inhibitors.
Carbon steel.
Carbon steel shells and carbon steel tubes with copper-free,
roll-formed aluminum fins @ 10 fins per in. Evacuated and sealed. Sprayed
with black, high heat enamel paint.
One automatic reset rated for 100,000 cycles, and one manual reset. Both
are snap-action bimetal type, open on temperature rise.
High-quality preset 100 psig (689 kPa) stainless steel pressure relief device.
Built in 120 V control. Optional 24V control (recommended) is available.
40 FLA (50 A resistive per pole) Definite Purpose.
Rated for 500,000 mechanical operations.
Multitap primary, 120V or 24V secondary.
Thermal delay fuse with spare, .25” x 1.25” , 120V = 1/4 A, 24V = 1 A.
Built in, explosion-proof thermostat, 40°F to 80°F (5°C to 27°C)
Built-in, explosion-proof disconnect switch, 600V, 50A max with lock-out feature. Also available in a wall mount version.
-40°F to 104°F (-40°C to 40°C). Storage: -40°F to 140°F (-40°C to 60°C)
10,000 ft (3048 m) above sea level.
3
— WARNING! —
Read and follow the instructions in this manual. Failure to do so may result in severe or fatal injury.
IMPORTANT SAFETY INFORMATION
1. Heater is to be connected and serviced only by qualified electrician experienced with hazardous location
equipment. It is the responsibility of the installer to verify the safety and suitability of the installation.
2. Installation and wiring of the heater must adhere to all applicable codes. Heater must be effectively grounded to eliminate shock hazard.
3. 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. For details of hazardous locations with
potential for explosion, refer to the Canadian Electrical Code, Part 1, Section 18 or Articles 500 through 516
of the National Electrical Code.
4. Do not operate heater in ambient temperatures above 40°C (104°F).
5. Do not plug heater outlet with gloves, clothing, etc. or operate heater with louvers fully closed.
6. Explosion/Electric Shock Hazard. Disconnect heater from power supply 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.
7. Operate the heater only while it is permanently mounted in an upright position. Failure to comply will cause
overheating of the heat exchanger and shutting down of the unit by tripping the high temperature cutout.
8. This heater is equipped with two bimetal thermal high-limit cutouts, one automatic reset type and one
manual reset type. The heater is not to be operated with the high-limit cutouts disabled or disconnected
from the control circuit.
9. Keep all electrical enclosure covers tightly closed and secured with all bolts and threads. Cover joints must
be clean before replacing covers. Keep away from rain or snow. Heater is for dry indoor use only.
10.All unused threaded openings not used for supply wiring or remote mount room thermostat must be fitted
with threaded plugs approved for use in hazardous locations.
11.The heat exchanger is a factory vacuum-sealed unit. Do not attempt to loosen or tighten the vacuum plug or
pressure relief device. A loss of vacuum could cause nuisance tripping of the thermal cutouts or high
pressures which will cause the relief device to actuate with an accompanying loss of fluid.
12.The heat exchanger is filled with a mixture of water and inhibited ethylene glycol which is poisonous.
Contact with the fluid at operating temperatures may produce a burn hazard. Suggested first aid consists of
flushing eyes with plenty of water and to wash off skin in flowing water or shower. If any fluid leakage occurs
from the heater, disconnect it from the power supply and have the heat exchanger replaced with a factory
supplied unit.
13.Heater must be kept clean. When operating in a dirty environment, regularly clean the fin tubes, fan, and fan
guard. Refer to recommended maintenance procedures.
14.Do not operate heater in atmospheres which are corrosive to aluminum or steel.
15.See applicable electrical codes for seal requirements in field installed conduits. Factory installed conduits
require no further sealing.
16.Crackling or pinging noises within the heat exchanger during start up may occur. This is normal.
17.Air discharge at the bottom of the heater may be warmer than at the top. This is normal.
18.Do not attempt to install a Remote Fan Only Switch. Do not modify the heater in any way.
19.Use factory approved replacement parts only.
20.Contact factory for any questions or concerns.
4
— WARNING! —
Read and follow the instructions in this manual. Failure to do so may result in severe or fatal injury.
— INSTALLATION —
Mechanical
Location
Please follow guidelines below for optimum heating results:
1. Do not install heaters such that airflow is blocked or impeded by equipment or walls.
2. For occupant comfort, position heaters so that air discharge is directed across areas of highest heat loss,
such as doors, windows, and outside walls.
3. For large areas, arrange heaters such that the air discharge of one heater is directed towards the inlet of the
next heater. This sets up a rotational airflow with air circulation in the central area of the building.
4. For equipment freeze protection, direct air discharge at equipment.
5. For large workshops or warehouses it may be acceptable to use fewer, larger heaters.
6. Locate remote mount room thermostat on interior partition walls or posts away from cold drafts, internal heat
sources, and away from heater discharge air streams.
Mounting
1. A variety of mounting brackets are available from the factory to aid in installation.
2. The heater is designed to be installed in an upright and level position. All models should not be more than
±15 degrees or 2.5 in. (63.5 mm) from level when measured front-to-back, and ± 5 degrees 1.7 in. (43.2
mm) on 5 to 10 kW models, 2.0 in. (50.8 mm) on 15 to 20 kW models, and 2.4 in. (60.9 mm) on 25 to 35 kW
models from level when measured side-to-side. Failure to comply will cause high limit shut down. Refer to
heater data plate for tilt angles.
3. If using mounting hardware or a supporting structure not supplied by the factory, the unit should be
suspended through the four 9/16 in. (14 mm) mounting holes on top of the unit with 1/2 in. UNC bolts.
Lock washers should be used on all mounting nuts and bolts to ensure they don’t vibrate or work loose
due to fan vibration or other vibration transmitted to the heater. If in doubt consult factory.
4. It is essential that adequate structural support be provided for installation. The mounting structure must
be strong enough to support the heaters weight, provide sufficient stiffness to prevent excessive
vibration, and withstand all probable abusive situations such as transportable installations where truck offloading impacts, etc. may occur. Refer to table on Page 3, EXUB Specifications by Model Size, for heater
net weights.
Mounting Heights and Clearances
1. To ensure that warm air reaches the floor observe the recommended maximum mounting heights in table
on Page 3, EXUB Specifications by Model Size. Heaters may be mounted at higher elevations and still provide warm air at floor level however, the maximum mounting elevation at which this occurs depends on location and operational conditions.
2. Louvers may be adjusted to provide greater downward deflection of the discharge air. However, louvers
must not be set less than 30 degrees of the closed position.
3. Leave at least 10 in. (254 mm) clearance between the rear of the motor and the nearest obstruction.
4. For easy removal of the core, leave clearance beneath the heater equal to the height of the heater cabinet
plus 2 in. (51 mm).
5
— WARNING! —
Read and follow the instructions in this manual. Failure to do so may result in severe or fatal injury.
— INSTALLATION —
Electrical
1. Heater is to be connected and serviced only by qualified electrician experienced with hazardous location equipment. It is the responsibility of the installer to verify the safety and suitability of the installation.
2. Explosion/Electric Shock Hazard. Disconnect heater from power supply 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.
3. Use copper conductors only for supply wires and approved explosion-proof means of wiring during installation. Use minimum 90°C
rated wire. Refer to “Supply Wire Requirements” table and heater data plate for conductor wire rating.
4. Installation must include appropriate over-current protection devic- EXUB Supply Wire Requirements
es (fusing or circuit breakers) as required by the CEC or NEC.
Refer to “Supply Wire Requirements” table and heater data plate
for current ratings. Supply voltage is to be within 10% of the data
plate voltage.
5. Confirm that the electrical power supply matches the nameplate
voltage, phase, amperage and frequency rating of the heater to be
connected.
Model
Total Minimum
kW Volts Ø Current Circuit
Amps Ampacity
Max F
use
Amps
Supply
Wire
90°C (AWG)
EXUB5AK2
5
208
1
26.5
33.2
35
8
EXUB5AK3E
5
240
1
23.3
29.2
30
10
12
EXUB5AK5
5
208
3
14.6
18.2
20
EXUB5AK6E
5
240
3
12.7
15.9
20
12
EXUB5AK7E
5
480
3
6.7
8.4
15
14
6. Supply conductors and ground conductor pass through the 1 in.
NPT rigid conduit opening on the control enclosure.
EXUB5AK8E
5
600
3
5.5
6.9
15
14
EXUB7AK2
7.5
208
1
38.6
48.2
50
6
7. Proper installation of the heater requires that an adequate grounding conductor be connected to the ground terminal. This terminal is
made of copper and is located on the top right-hand corner of the
printed circuit board within the control enclosure.
EXUB7AK3E
7.5
240
1
33.8
42.2
50
8
EXUB7AK5
7.5
208
3
21.5
26.9
30
10
EXUB7AK6E
7.5
240
3
18.7
23.4
30
10
EXUB7AK7E
7.5
480
3
9.7
12.2
15
14
EXUB7AK8E
7.5
600
3
7.9
9.9
15
14
EXUB10AK3E
10
240
1
44.2
55.2
60
6
EXUB10AK5
10
208
3
28.5
35.6
40
8
EXUB10AK6E
10
240
3
24.8
30.9
35
8
EXUB10AK7E
10
480
3
12.7
15.9
20
12
EXUB10AK8E
10
600
3
10.3
12.9
15
14
EXUB15AK5
15
208
3
42.3
52.9
60
6
EXUB15AK6E
15
240
3
36.8
46.0
50
6
EXUB15AK7E
15
480
3
18.7
23.4
25
10
EXUB15AK8E
15
600
3
15.1
18.9
20
12
EXUB20AK7E
20
480
3
24.8
30.9
35
8
EXUB20AK8E
20
600
3
19.9
24.9
25
10
EXUB25AK7E
25
480
3
31.1
38.8
40
8
EXUB25AK8E
25
600
3
25.1
31.3
35
8
EXUB30AK7E
30
480
3
37.1
46.4
50
6
EXUB30AK8E
30
600
3
29.9
37.3
40
8
EXUB35AK7E
30
480
3
43.1
53.9
60
6
50
6
8. Heater may be supplied with a factory installed integral room thermostat (See Figure 1). On heaters not supplied with this option, it
is recommended that an external explosion-proof room thermostat be used. The wiring to the external thermostat must be copper
wire, 16 gauge minimum (for Class II) or 14 gauge minimum (for
Class I). Thermostat conductors may also be passed through the 1
in. NPT conduit opening or through the convenient 3/4 in. NPT
dedicated external thermostat conduit opening in the enclosure.
Connect the external thermostat conductors to the printed circuit
board terminal block marked “T’STAT”. The built-in control transformer supplies the heater with either 120V or 24V for internal unit
operation. This voltage will appear across the thermostat contacts
when they are open. The minimum thermostat contact rating
should be 1 amp @ 120 VAC. Refer to nameplate for control voltage of unit.
9. Refer to wiring diagram on Page 9 to ensure that all connections
are as required and securely fastened.
10. For heaters supplied with a factory installed integral disconnect
EXUB35AK8E
30 600 3
34.7
43.3
switch (See Figure 1), field wiring is as follows:
a. Remove the Disconnect cover assembly from the base by removing the six (6) cover bolts. Set the cover
assembly aside. CAUTION: Damaging the mating surfaces of the enclosure could destroy the flame path
and jeopardize the integrity of the flame proof enclosure.
b. Supply conductors and ground conductor pass through the 1 in. NPT rigid conduit opening located on the
top or bottom of Disconnect Enclosure. Supply conductors to be wired to DIN rail mounted Disconnect
Switch inside. Ground conductor to be wired to Ground Lug fastened to inside of Disconnect Enclosure.
Refer to wiring diagram on Page 9.
c. Attach cover to the enclosure using the six (6) bolts. Tighten to 150 inch-pounds ± 5 in-lbs.
Figure 1
11. All unused threaded openings in enclosures, not used for supply wiring or external room thermostat, must be fitted with threaded plugs
approved for use in hazardous locations (included). Factory installed conduits require no additional sealing.
12. Installer must seal each conduit run within 18” (457 mm) of enclosure. This seal must be suitable and listed for hazardous locations.
13. Ensure that input conductors and conduit have adequate strain relief at installation.
14. Before application of electrical power, recheck all connections to ensure compliance with the wiring diagram and any code requirements. Remove any foreign objects from the control box and heater. Reinstall cover tightly.
15. On all three-phase heaters, it is necessary to verify that the fan rotation is correct (counter clockwise when facing the rear of the
heater). If air delivery is not from the front of the heater, reverse any two supply leads at the main power contactor located in the
control enclosure.
16. The explosion-proof control enclosure and element enclosures are designed with O-rings, threaded joints and metal-to-metal contact at
the lid or cover joint to prevent an explosion. Do not attempt to install gasket material of any type at these joints. A light coating of antiseize compound may be applied to the threads to prevent seizing.
6
— WARNING! —
Heater is to be serviced only by qualified electrician experienced with hazardous location equipment.
Explosion/Electric Shock Hazard. Disconnect heater from power supply 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.
— Repair and Replacement —
Heat Exchanger Replacement
The heat exchanger has been air evacuated, fluid filled, and sealed at factory and is not field repairable. Replacement heat
exchangers are available from the factory and are inspected and electrically tested for correct heat output and proper
operation of the high-limits.
1. Explosion/Electric Shock Hazard. Disconnect heater from power supply 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.
2. To prevent burn hazard, be sure heat exchanger and fluid has been allowed to cool before proceeding.
3. Remove cabinet bottom panel, element housing cover, element enclosure cover, & control enclosure cover.
4. From the control enclosure, disconnect two high-limit wires from printed circuit board terminal block marked 3 & 4 and
disconnect three output heating element wires from contactor terminals marked T1, T2, & T3.
5. Slightly loosen all cabinet bolts and louver screws to prevent heat exchanger from binding.
6. The heat exchanger is secured by three 1/4 in. bolts on the right-side cabinet panel (when facing front of heater) and
one 1/4 in. bolt located on the left side of heater. On 5 - 10kW models the left-side bolt is located at the top right-hand
foot of control enclosure. On 15 - 35kW models the left-side bolt is located above the control enclosure. With an assistant supporting the weight of the heat exchanger remove these 4 bolts. Carefully lower the heat exchanger from the
cabinet.
7. Reverse the above procedure when installing a new heat exchanger.
Temperature High-Limit Replacement
This heat-exchanger includes one automatic reset & one manual reset temperature high-limit that are wired in series. The
automatic reset high-limit is rated for 100,000 cycles and is for a temporary failure condition. Continuous nuisance tripping
of the automatic reset is generally not the fault of the high-limit but is usually caused by incorrect operating voltage, blocked
air inlet or outlet, fan/motor malfunction, high ambient temperatures, excessively dirty heat exchanger or leaking heat exchanger. Care should be taken to determine the exact reason that the automatic reset high-limit control tripped so
the problem can be resolved immediately. The automatic reset high-limit normally fails in the open position, however, it
can also fail closed.
If the automatic reset fails in the open position the heater will not function and the high-limit should be replaced. The
occurrence of the manual reset high-limit control to trip is an abnormal condition and indicates that the automatic
reset high-limit has failed in the closed position. If this occurs remove the heater from service immediately and
replace the automatic reset high-limit. Determine the exact reason that the automatic reset high-limit control
tripped so the problem can be resolved immediately. If the manual reset high-limit shuts down the heater it will have to
be reset by pressing on the small reset button protruding from the center of the high-limit device.
1. De-energize the heater electrical supply circuit.
2. Remove element housing cover, and element enclosure cover.
3. Remove spade connection from the automatic reset high limit lugs.
4. Remove automatic reset high-limit assembly by unscrewing, and clean the inside of the thermowell. A clean thermowell
ensures good thermal contact.
5. Replace high-limit with a factory supplied unit only. Apply a small drop of heat sink conductive cement around the base
of the high-limit, but not on the threads, and screw into thermowell. Attach spades to automatic reset high-limit .
6. Replace control enclosure cover, element housing cover, and element enclosure cover.
7. Energize the heater electrical supply circuit and let run for 15 minutes to reach a stable operating temperature.
8. If heater operation appears to be normal, place unit into service.
7
— WARNING! —
Heater is to be serviced only by qualified electrician experienced with hazardous location equipment.
Explosion/Electric Shock Hazard. Disconnect heater from power supply 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.
— Repair and Replacement, Continued —
Fan, Fan Guard or Motor Replacement
The motor is a sealed unit that requires no lubrication. If the motor is defective, it must be replaced with
an original factory supplied motor.
1. Remove four bolts holding motor to the motor mount, and covers from junction box and control enclosure.
On units with an integral room thermostat, remove 4 bolts on front face of thermostat enclosure .
2. Detach and remove two-piece fan guard assembly by removing top and bottom screws that attach the fan
guard to the cabinet.
3. Loosen fan blade set screw and remove fan blade from end of motor shaft leaving it in fan panel opening.
4. Unscrew the expansion union fitting between motor and motor enclosure (or integral thermostat enclosure).
5. If replacing motor, note wire connections for future reference and cut all wires leading to the motor close
to the terminations. All motor wires are permanently marked according to the nameplate on the motor. Lift
the motor assembly off the motor mount.
6. If replacing fan blade only do not cut any wires and move the motor assembly back sufficient to assist fan
blade removal.
7. To reassemble, place fan blade inside fan panel opening and then place motor onto motor mount. Slip fan
blade onto motor shaft and ensure fan hub is flush with end of motor shaft. Tighten set screw to 150 in-lbs
torque.
8. Fasten the two-piece fan guards to the cabinet.
Torque Settings
9. Tighten conduit fittings between motor and motor enclosure
(or integral thermostat enclosure). Center fan in fan-panel
opening and leave approximately 1/16” to 3/16” (1.6 to 4.8
mm) gap between motor face and fan guard.
10. Bolt motor to motor mount, tighten nuts to 250 in-lbs torque.
Manually spin the fan blade to ensure it rotates freely before
reconnecting heater to power supply. Fan must rotate
counterclockwise when viewed from rear of heater.
Item
Torque (in-lbs)
Fan blade set screw (1 only)
150
5/16 - 18 UNC motor nuts
250
5/16 - 18 UNC motor mount bolts
250
1/4 - 20 UNC fan panel bolts
100
1/4 - 20 UNC fan guard self tapping screws
100
#10 - 24 UNC louver blade screws
28
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 wiring diagram). Individually terminate all unused wires using closed
end connections.
Printed Circuit Board
1.
Replace with a factory supplied P.C. Board.
Thermal Delay Fuse
1.
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”.
8
— Warning —
Wiring should only be connected by qualified personnel experienced in electrical work.
— Electrical Wiring —
Disconnect
- 600V, 50A
Disconnect
Integral or external
3 pole contactor relay
Fan
blade
Motor
Heater
Elements
Supply Voltage
208 or 240 V
Single Phase
120 or 24V AC
Contactor coil
120 or 24 Volt
Common
N/C
Voltage Transformer
Terminal panel
mounted on
transformer
120/24 Volt Thermostat
Integral or external
Fuse, time delay,
1/4 A for 120V control
1A for 24 V control.
Glass cartridge.
1/4" dia x 1-1/4" long
Provision for spare fuse
Temperature
High Limit
Manual reset
155°C
Temperature
High Limit
Auto reset
149°C
Explosion-proof
enclosure
Thermostatic Control for
208 or 240 Volts,
Single phase
Disconnect
- 600V, 50A
Disconnect
Integral or external
Fan
blade
Motor
3 pole contactor relay
Heater
Elements
Supply Voltage
208, 240, 480, 600 V
Three Phase
120 or 24V AC
Contactor coil
120 or 24 Volt
Common
N/C
Voltage Transformer
Terminal panel
mounted on
transformer
120/24 Volt Thermostat
Integral or external
Fuse, time delay,
1/4 A for 120V control
1A for 24 V control.
Glass cartridge.
1/4" dia x 1-1/4" long
Provision for spare fuse
Temperature
High Limit
Manual reset
155°C
Temperature
High Limit
Auto reset
149°C
9
Explosion-proof
enclosure
Thermostatic Control for
208/240/480/600 Volts,
Three phase
— Assembly Diagram —
14
Optional built-in disconnect
switch
21
16
36
25
27
28
34
35
24
33
31
26
32
30
29
3 Phase
1 Phase
10
— Parts List —
*** Please have model & serial number available before calling ***
Item
No.
Description
12" fan size
5 & 7.5 kW
10 kW
16" fan size
15 & 20 kW
20" fan size
25, 30 & 35 kW
1
Core assembly ( with bus bars)
2
Bottom panel
RZ235459
Specify Voltage, phase, and kilowatts ( V-Ph-kW)
RZ235477
RZ235490
3
Left side panel
RZ235460
RZ235478
RZ235491
RZ235492
4
Louver blades
RZ235461
RZ235479
5
Top panel
RZ235462
RZ235480
RZ235493
6
Right side panel
RZ235463
RZ235481
RZ235494
7
Fan panel
RZ235464
RZ235482
RZ235495
8
Fan blades
15.0 kW = RZ235454
20.0 kW = RZ235455
25.0 kW = RZ235456
30.0 & 35.0 kW = RZ235457
9
Fan guard (2 pieces)
RZ235465
RZ235483
RZ235496
10
Motor, explosion-proof
115/208-230V, 1Ø, 60Hz = RZ235446
208-230/460V, 3Ø, 60Hz = RZ235447
575V, 3Ø, 60Hz = RZ235449
11
Right side motor bracket
12
Motor base
13
Left side motor bracket
14
Expansion union, female
15
Conduit, expansion union to elbow
5.0 kW = RZ235451
7.5 kW = RZ235452
10.0 kW = RZ235453
Thermostat, ex-proof
575V, 3Ø, 60Hz = RZ235450
RZ235458
RZ235466
RZ235484
RZ235474
RZ235467
RZ235485
RZ235475
RZ235476
RZ235468 with thermostat
RZ235469 without thermostat
RZ235500 with thermostat
RZ235501 without thermostat
17
Conduit, potted
18
Conduit, vertical
19
O-ring, element enclosure cover
RZ235488
20
Cover, element enclosure
RZ235489
21
Guard, element enclosure
22
Conduit, motor box to enclosure
RZ235470
RZ235486
24
RZ235499
RZ235504
RZ235471
22A Union
RZ235502
RZ235505
Box, motor outlet
23A Conduit, motor to motor box
RZ235498
RZ234436, (CX1 ex-proof wall thermostat)
16A Elbow, 90°
23
RZ235497
RZ235473
15A Reducing bushing
16
208-230/460V, 3Ø, 60Hz = RZ235448
RZ235506
RZ235472
RZ235487
Enclosure, control
RZ235503
RZ235507
25
Contactor
120V = RZ235508,
24V = RZ235509
26
Transformer
120V = RZ235510,
24V = RZ235511
27
Bracket, Transformer ground
28
Grounding lug
29
Fuse
30
Printed circuit board assembly
120V = RZ235516,
31
High limit, automatic reset
RZ235518 (also requires Part # RZ235519)
32
Conductive cement, high limit
33
Bracket, transformer
RZ235520
34
O-ring, control enclosure cover
RZ235521
RZ235512
RZ235513
120V = 1/4 Amp (RZ235514),
24V = 1 Amp (RZ235515)
24V = RZ235517
RZ235519
35
Cover, control enclosure
RZ235522
36
Plug, 3/4” NPT explosion-proof
RZ235523
37
Nut, bus bar
RZ235524
38
Bus bar, long straight
RZ235525
39
Bus bar, short straight
RZ235526
40
Bus bar, short curved
RZ235527
41
Bus bar, long curved
42
High limit, manual reset
RZ235528
RZ235529 (also requires Part # RZ235519)
43
Handle, Disconnect
RZ235530
44
Switch, Disconnect 60A Non-Fused
RZ235531
11
— WARNING! —
Heater should only be service by qualified personnel experienced in electrical work.
Disconnect unit heater from power supply before starting any service or repair work. Lock the disconnect
switch in the “OFF” (open) position and/or tag the switch to prevent unexpected power application.
Failure to follow these procedures may result in severe or fatal injury.
— Maintenance Program —
Regular inspection, based on a schedule determined by the amount of dirt in the atmosphere, assures
maximum operating economy and heating capacity.
Annual Inspection (before each heating season)
1. Check all terminal connections and electrical conductors for damage, looseness, defects, fraying, etc. and
replace or tighten where applicable.
2. Inspect contactor contacts. If badly pitted, burned or welded shut, replace with factory supplied contactor. It
is recommended that the contactor be replaced every three (3) years.
3. Inspect thermal delay fuses. Fuse rating and type are printed on circuit board. Correct fuse must be in the
“ACTIVE” fuse clip. An extra fuse should be stored in the clips marked “SPARE”.
4. Check for fluid leakage from heat-exchanger. The heat exchanger is filled with a mixture of water and inhibited ethylene glycol, which is poisonous, and is factory vacuum-sealed. If fluid leakage occurs, remove
heater from service and have the heat-exchanger replaced by a factory replacement unit. Refer to “Repair
and Replacement” section for complete details. Do not attempt to loosen or tighten the vacuum plug or
pressure relief device. A loss of vacuum could cause nuisance tripping of the thermal cutouts or high
pressures which will cause the relief device to actuate with an accompanying loss of fluid.
5. Check all explosion-proof conduit and fittings. Replace damaged components. All threaded conduit
connections must have a minimum 5 turns of engagement. Taper threaded connections must be at least
hand tight. Inside of enclosures must be clean, dry, and free from any foreign materials. Enclosure covers
must also be completely on and tight.
6. Check electrical resistance on all load side legs. Reading should be balanced (± 5%).
7. 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.
8. Check fan blade. Replace immediately if cracked or damaged.
9. Check louvers. Louver screws should be tight. Louvers must not be set less than 30 degrees of the closed
position.
10. Check the tightness of all hardware. All nuts and bolts, including mounting hardware, must be tightened to
correct torque settings on Page 8.
11. Turn heater motor on for a minimum of 10 minutes. Crackling or pinging noises within heater during startup are normal. Check for air exiting heater through louvers and smooth running of motor.
Periodic Maintenance (before and as required during heating season)
1.
Clean the following (remove dust using compressed air):
2.
 Finned tubes
 Fan
 Fan Guard
 Motor
 Louvers
Check the following:




Motor for smooth and quiet operation
Louvers for proper angle and tightness
All explosion-proof covers and fittings for tightness
Contactor for signs of wear or pitting
12
HEATER MAINTENANCE RECORD
Heater Model: _________________________
Date of
Maintenance
Serial No.: ______________________________
Performed
By
Maintenance Performed
13
NOTES
14
NOTES
15
Limited 36-Month Warranty
Reznor warrants all EXUB series of explosion-proof electric heaters
against defects in materials and workmanship under normal conditions
of use for a period of thirty-six (36) months from date of purchase based
on the following terms:
1. The heater must not be modified in any way.
2. The heater must be stored, installed and used only in accordance with
the owner’s manual and attached data plate information.
3. Replacement parts will be provided free of charge as necessary to
restore any unit to normal operating condition, provided that the
defective parts be returned to us freight prepaid and that the
replacement parts be accepted freight collect.
4. The complete heater may be returned to our manufacturing plant for
repair or replacement (at our discretion), freight charges prepaid.
5. Components damaged by contamination from dirt, dust, etc. or
corrosion will not be considered as defects.
6. 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 damages or losses.
PRINTED IN CANADA
©Copyright 2014
Tel.: 1 800 695-1901
www.RezSpec.com
Reznor is registered in the United States and
other countries.
The information contained in this
manual has been carefully checked
and verified for accuracy. Specifications subject to change without
notice.
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