®
Chromalox
SERVICE REFERENCE
Installation Instructions
DIVISION
SALES
4
SECTION CXH-A
and
REFERENCE (Supersedes PF490-4)
PF490-5
RENEWAL PARTS IDENTIFICATION
161-302421-004
DATE
JULY, 2004
2”
2”
E
Forced Air Heater
for Hazardous Locations
CXH-A-03 EP to CXH-A-35 EP
Class I - Groups C & D, Div. 1 & 2
Class II - Groups E, F & G
T3B - 165˚C (329˚F)
A
B
D
A
11-1/16”
C
Table A – Specifications
5/8” UNC Tapped
Mounting Hole
Locations
Overall Dimensions
(In.)
Horiz. Air
Discharge
(Ft.)
Wt.
Model
kW
3
Voltage and Phase
BTUH
CFM
700
700
840
840
1450
(Lbs.)
127
127
133
138
150
A
B
C
D
E
208/240V-1 or 3Ø
480/575V-3Ø
208/240V-1 or 3Ø
480/575V-3Ø
208/240V-1 or 3Ø
480/575V-3Ø
240V-1 or 3Ø
208/480/575V-3Ø
208/240/480V
575V-3Ø
CXH-A-03
CXH-A-05
CXH-A-07
CXH-A-10
CXH-A-15
28
28
32
32
47
10,236
17,060
25,590
34,120
51,180
19-1/8
19-1/8
19-1/8
19-1/8
25
23-7/8
23-7/8
23-7/8
23-7/8
27-7/8
21
21
21
21
21
3-1/2
3-1/2
3-1/2
3-1/2
4-13/32
13-5/8
13-5/8
13-5/8
13-5/8
17-5/8
5
7.5
10
15
CXH-A-18
CXH-A-20
CXH-A-25
CXH-A-30
CXH-A-35
18
20
25
30
35
240V-3Ø
43
43
54
54
54
61,420
68,240
85,300
102,360
119,420
1400
1400
2330
2330
2330
165
165
200
200
200
25
25
32-1/8
32-1/8
32-1/8
27-7/8
27-7/8
31-7/8
31-7/8
31-7/8
21
21
21-3/4
21-3/4
21-3/4
4-13/32
4-13/32
5-1/2
5-1/2
5-1/2
17-5/8
17-5/8
21-5/8
21-5/8
21-5/8
480/575V-3Ø
480/575V-3Ø
480/575V-3Ø
480/575V-3Ø
© 2010 Chromalox, Inc.
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INSTALLATION
the use of a mounting kit (ceiling, wall or pole) available from
Chromalox. (Figures 5, 6 and 7)
FIRE/EXPLOSION HAZARD. Mount only in upright
position and observe nameplate mounting clear-
ances.
The ceiling or wall mounting surface and the anchoring pro-
vision must be sufficient to support the combined weights of the
unit and mounting hardware.
If using mounting hardware or a supporting structure not
supplied by Chromalox, the unit should be suspended from the
supporting structure thru the two mounting points on top of the
unit with 5/8 NC bolts and lockwashers. If single point mounting
is desired, order the correct size Chromalox adapter bracket (P/N
027-302361-001 for 12” fan units, P/N 027-302361-002 for 16”
fan units) and P/N 027-302361-003 for 20” fan units. This bracket
is designed to hold the unit over its center of gravity with a 1 dia.
bolt. The maximum tilt angles as shown in Figure 3 must not be
exceeded in either direction during operation and installation.
Failure to comply will cause high limit shut down.
Heater Location instructions:
Arrange units so their discharge air streams:
A. are subjected to a minimum of interference from columns,
machinery and partitions.
B. wipe exposed walls without blowing directly at them.
C. are directed away from room occupants in comfort heating.
D. are directed along the windward side when installed in a
building exposed to a prevailing wind.
Locate thermostat on interior partition walls or posts away
from cold drafts, internal heat sources and away from heater dis-
charge air streams.
Small rooms can be heated by one unit heater. Where two
walls are exposed, the heater should be mounted as shown in
Figure 2. Large rooms require multi-unit installations. Number
and capacity of units will be determined by volume of building
and square feet of floor area to be heated. Arrange units to pro-
vide perimeter air circulation where each unit supports the air
stream from another.
The CXH-A hazardous location heaters are designed for use
only in a permanently mounted upright position. We recommend
Figure 2
Maximum Out of Plane Allowance
1/2" Max
13mm
1/2" Max
13mm
Figure 3
The heaters may be mounted at any convenient height above
floor. The minimum spacings shown in Figure 4 should be main-
tained to adjacent walls and ceiling. If floor heat is desired, do not
mount higher than 8 to 10 feet above floor.
Controlling thermostats to individual heaters should be
mounted at shoulder height on inside walls or columns and clear
of the discharge air stream of the unit. Allow at least 4 in front of
heater for air stream to discharge freely.
Heater may be mounted on a shelf or stand from the bottom.
Be sure that mounting clearances are maintained and that bottom
of unit has at least 1 clearance underneath it. This is necessary for
good air circulation and servicing of heat exchanger. All mount-
ing methods must allow for removal of front cover.
The mounting and anchoring provisions must take into
account the unit vibration and cantilevered loading when wall or
pole mounted. One of the Chromalox mounting kits shown in
Figures 5, 6 and 7 must be used whenever possible.
Do not mount mercury type thermostat directly on unit,
vibration could cause malfunction.
Installation Clearances
102mm
Min.
(4")
5/8 NC (2)
Thds. For
Mounting
102mm Min. (4")
2"
204mm
Min.
(8")
Figure 4
3
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MOUNTING KITS
Wall Mount Kit
Pole or Wall Mount Kit
Model # WMB-12 12” Fan (3-10 kW)
Model # WMB-16 16” Fan (15-20 kW)
Model # WMB-20 20” Fan (25-35 kW)
Model # PMB-12 12” Fan (3-10 kW)
Model # PMB-16 16” Fan (15-20 kW)
Model # PMB-20 20” Fan (25-35 kW)
12” Fan - 16-3/4”
Heater Mounting
16” Fan - 18-1/2”
20” Fan - 22”
Wall
Bracket
1”ø Hardware % Bolt
Single Point
Swivel Mount
Supplied
Pole Support
Bracket
Bracket Arm &
Hardware
Ž
1/2 ø Hardware
Not Supplied
Single Point
Swivel 4”ø
Supplied
P
Adapter Bracket
Supplied
with 5/8 Bolts
Adapter Bracket
& 5/8 NC Hardware
Supplied
P
ø 3/8 Hardware
Cust. Supplied
5-1/2” - 12” Fan
5-1/8” - 16” Fan
6-3/8” - 20” Fan
ø 1/2 x 4” U-Bolts
& Hardware
Cust. Supplied
CXH-03EP through CXH-10
CXH-10EP through CXH-20
CXH-25EP through CXH-35
P=10”
P=11-1/2”
P=14-1/2”
Figure 5
Ceiling Mount Kit
Model # HMK-00
6” Ref.
3-1/2” SCH. 40 Pipe
or 4” O.D. X .25 Wall
Tube Cust. Supplied
Length to Suit
Cust. Supplied ø 1/2 Mounting
Hardware. Bracket Spacing
suitable for use with 4” U-Bolts
4-9/16
Swivel Ceiling
Hanger S/A &
Hardware
Pole Base
4-7/8
Œ
3/8” ø Hardware
Required for
Mounting -
5/8” ø Hex Nuts &
Washers
ø 5/8 Rods Length to suit
1” Min. Threaded Ends
Customer Supplied
Supplied for
Installation
Cust. Supplied
Top & Bottom
CXH-03 through CXH-10
CXH-10 through CXH-20
CXH-25 through CXH-35
P=10”
P=11-1/2”
P=14-1/2”
Figure 7
Figure 6
Electrical
Components
Unit Top View
Transformer
1” NPT
Jumper Wire
1” NPT
Top Line Supply
Entry
Pilot Lamp
(Opt.)
Contactor
1/2” NPT
Thermostat Entry
Heat
Exchanger
Wiring
5/8-11 Threaded
Mounting Holes (2)
Compartment
Figure 9
Figure 10
4
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WIRING AND WIRING DIAGRAMS
4. The fan motor is factory wired at the same voltage, and phase as
the heating elements. All motors are thermally protected and con-
nected to the main supply contactor. On three phase units, it is
necessary to verify that the fan rotation is correct. Air stream
discharge must be out front of unit. After connecting unit to line
and closing all covers tightly, energize unit momentarily. If air
does not exit front louvers, reverse any two supply leads at the
box lugs on the contactor or at the supply disconnect.
ELECTRIC SHOCK HAZARD. Disconnect all power
before installing or servicing heater. Failure to do so
could result in personal injury or property damage.
Heater must be installed by a qualified person in accor-
dance with the National Electrical Code, NFPA 70.
5. Either of two 1 NPT rigid conduit openings with integral stops
may be used for connection to supply line. (See Figure 9 and 10
for locations) Use only NEC approval hazardous locations means
of wiring such as mineral insulated cable and fittings or rigid con-
duit and seal fittings located as required by installation codes.
ELECTRIC SHOCK HAZARD. Any installation involving
electric heaters must be performed by a qualified
person and must be effectively grounded in accor-
dance with the National Electrical Code to eliminate
shock hazard.
1. Loosen and remove bolts securing the main terminal enclosure
cover on side of unit. Connect heater to line supply wires at the
box lugs located on the contactor according the voltage and fre-
quency specified on the nameplate (see Figure 9). Refer to the
appropriate wiring diagram which also appears on the inside
cover of this enclosure (see Table B and diagrams on page 6).
EXPLOSION HAZARD. All unused conduit openings
must be fitted with plugs that are U.L. recognized for
use in hazardous locations.
6. Heaters may be provided with a built-in control switch and/or
thermostat. If not, they should be controlled by an externally
mounted disconnect switch and/or separately mounted thermostat
as shown in the appropriate wiring diagram on page 6. In case of
malfunction, the personnel in the area should be aware of location
of heater disconnect.
7. Installation must include appropriate over current protection
devices (fusing or circuit breakers) as required by the National
Electric Code in the supply line to the unit. Refer to nameplate for
proper current ratings.
8. To operate heaters from an externally mounted hazardous location
thermostat, a terminal block is provided for connection (Figures 9
and 10). Remove the factory installed jumper across T2 and T3 on
the terminal strip. Wire the thermostat contact leads to these ter-
minals. The built in control transformer supplies the unit with
either 24V or 120V 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. The 1/2 NPT con-
duit wiring entry on top of the terminal enclosure should be used
to wire the thermostat to the heater (Figure 10).
9. Protection against overheating is provided by a manual reset limit
control located within the heat exchanger wiring compartment.
(Figure 9) Activation of the control will open the control circuit
and energize the pilot lamp (if supplied). If normal airflow is
restricted, or stopped, the unit will be cycled off by the manual
reset cutout. The manual reset limit control is also designed to
shut down the unit completely if the fluid level is low or other
heater malfunction occurs.
EXPLOSION HAZARD. Cover joints must be clean
before replacing cover. Do not use any gasket materi-
al on joint surfaces.
2. Use copper conductors only for supply wires. Refer to name-
plate and Table B for size and rating required.
3. Connect supply line ground conductor to the box lug provided
on the base plate below contactor input lugs.
Table B – Supply Wiring Requirements
Supply Wire
90˚C Size
(ga)
Max Fuse
Amps
Wiring
Diagram #
Model
kW
Phase
Volts
CXH-A-03
CXH-A-03
CXH-A-03
CXH-A-03
CXH-A-03
CXH-A-03
3
3
3
3
3
3
1
3
1
3
3
3
208
208
240
240
480
575
10
12
10
12
12
12
25
15
20
15
15
15
I
II
I
II
II
II
CXH-A-05
CXH-A-05
CXH-A-05
CXH-A-05
CXH-A-05
CXH-A-05
5
5
5
5
5
5
1
3
1
3
3
3
208
208
240
240
480
575
8
10
8
10
12
12
35
20
30
20
15
15
I
II
I
II
II
II
CXH-A-07
CXH-A-07
CXH-A-07
CXH-A-07
CXH-A-07
CXH-A-07
7.5
7.5
7.5
7.5
7.5
7.5
1
3
1
3
3
3
208
208
240
240
480
575
6
8
50
30
45
25
15
15
I
II
I
II
II
II
6
8
12
12
CXH-A-10
CXH-A-10
CXH-A-10
CXH-A-10
CXH-A-10
10
10
10
10
10
3
1
3
3
3
208
240
240
480
575
8
4
40
60
35
20
15
II
I
II
II
II
Manual reset limit control must never be bypassed in
the control circuit. If the limit actuates, shut down
unit and investigate cause of abnormal operation. Do
not reenergize until the problem has been corrected.
8
10
12
CXH-A-15
CXH-A-15
CXH-A-15
CXH-A-15
15
15
15
15
3
3
3
3
208
240
480
575
4
6
8
60
50
25
20
II
II
II
II
10
CXH-A-18
18
3
240
4
60
II
Users should install adequate back-up controls and
safety devices with their electric heating equipment.
If the back-up controls are to be located in the haz-
ardous area, they must be approved for use in the
class of location. Where the consequences of failure
may be severe, back-up controls are essential.
CXH-A-20
CXH-A-20
20
20
3
3
480
575
8
8
35
30
II
II
CXH-A-25
CXH-A-25
25
25
3
3
480
575
8
8
40
35
II
II
CXH-A-30
CXH-A-30
30
30
3
3
480
575
6
8
50
40
II
II
CXH-A-35
CXH-A-35
35
35
3
3
480
575
4
6
60
50
II
II
5
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WIRING DIAGRAMS
DIAGRAM I
Refer to Name Plate for Input Voltage
1PH
L1 L2
Optional
Disconnect
Transformer Color Code Tabulation
Switch
PRI
PRI. XFMR
120V SEC
24V SEC
GND
VOLT.
LEAD CLRS.
LEAD CLRS.
LEAD CLRS.
C1
Elements
H1
H2
X1
BLK
BLK
BLK
BLK
-
X2
X1
YEL
YEL
YEL
-
X2
BLU
BLU
BLU
-
208
240
380
415
415
BLK
BLK
BLK
BLK
BLK
RED
ORG
VIO
YEL
BRN
WHT
WHT
WHT
WHT
-
YEL
YEL
YEL
BLU
BLU
BLU
480
575/600
BLK BLK/RED BLK
BLK GRY BLK
WHT
WHT
M
H1
X1
H2
X2
1 PH
Motor
Optional
Refer to Nameplate
for Transformer
Voltage
C1
R
Auxiliary
Contactor
Factory Wiring
Optional or Customer Wiring
Alarm
C1
T3
T2
Contactor Coil
Manual Reset
High Limit
Remove this wire
when using a
thermostat
Built in or
External
Thermostat
DIAGRAM II
Refer to Name Plate for Input Voltage
3PH
L1 L2
L3
Transformer Color Code Tabulation
Optional
Disconnect
Switch
PRI
PRI. XFMR
120V SEC
24V SEC
VOLT.
LEAD CLRS.
LEAD CLRS.
LEAD CLRS.
GND
H1
H2
X1
BLK
BLK
BLK
BLK
-
X2
X1
YEL
YEL
YEL
-
X2
BLU
BLU
BLU
-
C1
Elements
208
240
380
415
415
BLK
BLK
BLK
BLK
BLK
RED
ORG
VIO
YEL
BRN
WHT
WHT
WHT
WHT
-
YEL
YEL
YEL
BLU
BLU
BLU
480
575/600
BLK BLK/RED BLK
BLK GRY BLK
WHT
WHT
M
H1
H2
X2
3 PH
Motor
X1
Optional
Refer to Nameplate
for Transformer
Voltage
C1
R
Factory Wiring
Optional or Customer Wirin
Auxiliary
Alarm
Contactor
C1
T3
T2
Contactor Coil
Manual Reset
High Limit Control
Remove this wire
when using a
thermostat
Built in or
External
Thermostat
6
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MODEL NUMBER DESCRIPTION
CXH-A
10
4
3
30
40
1
1
EP
Explosion Proof
Heater Voltage
30 = 24V Controls
32 = 120V Controls
1 = Ethylene Group C & D, E, F, G T3B
2 = Propylene Group C & D, E, F, G T3B
3 = Ethylene Group C, D, F, G T3B
4 = Propylene Group C, D, F, G T3B
2 = 240V 6 = 575V
3 = 380V 8 = 208V
4 = 480V 9 = 600V
5 = 415V
0 = No Options
1 = 15 or 30 Amp Disconn. Switch
2 = 60 Amp Disconn. Switch
3 = Pilot Light
4 = Pilot Light and 30 Amp
Disconn. Switch
5 = Pilot Light and 60 Amp
Disconn. Switch
6 = Summer Fan Switch
7 = Summer Fan Switch, Pilot Light
8 = Disconn. Switch with Summer
Fan Switch
9 = Disconn. Switch, Pilot Light
with Summer Fan Switch
Heating Element Rating
Phase
1 = 1 Phase
3 = 3 Phase
00 = No Thermostat
40 = Thermostat
03 = 3.0 kW 18 = 18.0 kW
05 = 5.0 kW 20 = 20.0 kW
07 = 7.5 kW 25 = 25.0 kW
10 = 10.0 kW 30 = 30.0 kW
15 = 15.0 kW 35 = 35.0 kW
Electric Blower Unit Heater for Hazardous Locations
OPERATION
2. The finned structure of the heat exchanger must be kept clean and
free of accumulated dust and dirt. The cabinet front panel is easily
removed providing access to the heater core for periodic cleaning.
3. Unit should not be operated with louvers fully closed. Mechanical
stops are incorporated into the design of the cabinet to limit the
degree of closure. Do not force the louvers beyond these stops.
4. If specified, units are supplied with a built in alarm pilot lamp
which will energize if the manual reset control has a been activat-
ed. During unit startup, the lamp will flash on momentarily to ver-
ify its operation.
EXPLOSION HAZARD. Heater should not be operated
in ambient temperature higher than 40˚C (104˚F) or in
atmospheres corrosive to the heater itself.
1. The CXH-A unit heaters use a sealed water-glycol filled heat
exchanger. The electric immersion elements transfer heat energy
directly to the fluid generating a fluid/vapor mixture which releas-
es its heat energy to the finned radiator as it rises and recondenses
back to the bottom reservoir to be reheated. This cycle will con-
tinue as long as fan forced air is available on the finned structure
to remove the heat to the airstream.
MAINTENANCE AND REPAIR
Maintenance and repair must be performed by qualified personnel only.
I. REPLACING THE HEAT EXCHANGER
EXPLOSION/ELECTRIC SHOCK HAZARD. Disconnect
all power before opening enclosure covers or servic-
ing heater. Failure to comply could result in personal
injury or property damage.
BURN HAZARD. Be sure heat exchanger and fluid has
been allowed to cool to 110˚F before proceeding.
1. Periodically inspect all electrical connections and terminals to
avoid electrical wiring difficulties. Inspect all wiring for frayed or
worn insulation.
2. Periodically and before each heating season, clean the finned heat
exchanger and fan inlet with compresses air, vacuum, or water jet.
Be sure all electrical covers are tightly closed.
3. If heat output seems to be low, check amperage draw on each ele-
ment. Compare measured values to the correct currents as listed
on the unit nameplate.
4. The thermally protected fan motor is permanently lubricated and
sealed. No field servicing is required or should be attempted.
Replace only with a factory supplied identical motor. Failure to
do so will void the factory warranty and may expose the user to
risk of ignition of hazardous atmospheres.
1. Detach the cabinet front by removing screws from all sides of unit
and pulling cover forward off cabinet shell. Detach bottom panel by
removing two screws on each side and two screws in the rear.
Remove the electrical control enclosure lid. Disconnect the heater
and high limit wires from the electrical control enclosure. Loosen
electrical conduit union located between the heater housing and the
electrical control enclosure. Support the lower end of the heat
exchanger and loosen the three hex head bolts which hold it to the
sheet metal. Lower the heat exchanger away from the sheet metal.
Reverse the above procedure when installing a new heat exchanger.
II. RESETTING MANUAL RESET LIMIT CONTROL
5. Check fan blade to be sure that set screws are tight and there are
no cracks or looseness in the blades. Use factory supplied replace-
ment blade only.
EXPLOSION HAZARD. Be sure that all enclosure cov-
ers are replaced and tightly closed before re-energiz-
ing unit after servicing electrical components.
6. Check for any sign of leaking from the heat exchanger. Too little
fluid will cause the manual high limit to trip.
High limit controls must never be bypassed in control
circuit.
7. The sealed heat exchanger contains a glycol/water solution of
propylene glycol. Ethylene glycol is supplied for arctic duty con-
ditions only. Avoid contact with skin and eyes. If ingestion should
occur, seek medical attention immediately. In case of eyes or skin
contact, wash affected areas with large amounts of water. The
MSDS (Material Safety Data Sheet) for these materials is
available upon request.
The factory must perform the replacement of the
immersion heater or overtemperature cutout. The
heat exchanger seal must not be broken. Consult fac-
tory for service.
7
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MAINTENANCE AND REPAIR
The occurrence of the manual reset limit control to trip is an
E. Remove 4 bolts in motor base holding it to rear cabinet shelf.
abnormal condition. Care should be taken to determine the exact
reason that the high limit control tripped. Possible problem areas
could be dirty heat exchanger, blocked air inlet or outlet,
fan/motor malfunction, too high operating ambient, incorrect
operating voltage, or leaking heat exchanger. In the event that the
heat exchanger is defective, it must be replaced.
See Figure 13.
F. Remove 4 screws holding fan guard to cabinet.
1. The manual reset limit control is located in the heating element
hazardous location enclosure on the heat exchanger which is
covered by the sheet metal housing attached to the side of the
unit. To gain access, remove the four sheet metal screws holding
the sheet metal cover in place and unthread the cast aluminum
enclosure lid. (See Figure 11.) The manual reset limit control
device has a small reset button protruding from the center of its
back housing. Depress this button in to reset the control.
Replace the aluminum enclosure lid and sheet metal cover.
Figure 13
G. Unthread union at motor wiring outlet nipple connection.
Carefully lift the motor, fan blade, and guard off of the cabi-
net.
H. Note position of fan blade on motor shaft. Loosen the two set
screws to remove the fan blade and key from shaft motor.
I. Place guard and fan blade on replacement motor shaft in same
locations as original motor. Align key ways in hub and shaft.
Insert key flush with fan hub and tighten the two hub set
screws.
5-3/4"
J. Feed motor wires back into conduit and reposition motor back
on unit. Center fan blade in opening and rotate to be sure that
it clears housing and guard.
K. Thread motor nipple connection into conduit union and tight-
en (5 threads minimum). Replace bolts in motor base and reat-
tach fan guard to back of housing in four places. Recheck
blade rotation and tighten all hardware.
L. Trim all motor leads extending out of the conduit to 6 lengths.
Strip off 3/8 of insulation at cut ends. Using the motor name-
plate, previous notes, and marked wires, reconnect the motor
for the unit voltage rating as indicated on the heater name-
plate. Re-attach the ground wire to the connection inside the
enclosure. Replace cover and tighten securely.
M. Check fan rotation by momentarily energizing the unit. Air
must exit at cabinet front. Reverse any 2 leads at contactor or
line supply disconnect to reverse rotation of three phase
motor.
5-3/4"
Figure 11
III. FAN MOTOR AND BLADE
1. 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. (See renewal parts section.)
2. To replace the motor, proceed as follows:
A. Disconnect the unit from power supply.
B. (Units with motor splice box) Remove 4 bolts and cover of
motor splice box (See Figure 12).
C. (Units without motor splice box) Remove 16 bolts and cover
of main control enclosure.
D. Note wire connections for future reference and disconnect all
wires leading to the motor. All motor wires are permanently
marked according to the nameplate on the motor.
3. Removal of fan blade does not require that the motor wiring be
disturbed. To clean, service or change the fan blade proceed as
follows:
A. Remove the four carriage bolts holding the motor base in
place on the cabinet platform. Mark the platform to reposition
at same location.
B. Loosen the four screws on the cabinet back holding the fan
guard in place.
C. Pull the motor to the rear extending the conduit connection at
the electrical enclosure. Fan blade and hub set screws can now
be accessed by tilting the guard rearward at top or bottom
back over the motor shell.
IV. ELECTRICAL COMPONENT SERVICING
EXPLOSION/ELECTRIC SHOCK HAZARD. Disconnect
all power before opening enclosure covers or servic-
ing heater. Failure to comply could result in personal
injury or property damage.
When provided, the following components are located in the cast
aluminum hazardous location enclosure. Remove cover and
retaining bolts to gain access the following items (See Figure 16):
Figure 12
8
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MAINTENANCE AND REPAIR
which is held tight to the enclosure with a locking nut on the
1. CONTROL TRANSFORMER
inside of the enclosure. It must be re-tightened if loosened before
reuse. Replace the lamp with a 656 type bulb at the correct control
voltage for the unit (120V or 24). Secure the lens cap (5 threads
minimum) against the locking ring and tighten securely before re-
energizing unit. Lamp should flash on momentarily when unit is
energized. See renewal parts section for part number of replace-
ment bulbs.
This item is located in the electrical enclosure. It may be replaced
while in the enclosure. To service or replace remove the quick
connect wires and mark their locations. Remove two screws
which hold the transformer in place. Note transformer orientation
and voltage labels on top. Replace transformer in the same orien-
tation and connect wires. Replace the cast aluminum cover and
bolt down.
2. CONTACTOR
This component can be removed from the base plate while in the
enclosure. Follow the same steps as indicated for the transformer
replacement.
3. ALARM PILOT LAMP (OPTIONAL)
To replace the bulb, unscrew the red lens bezel while holding the
lock ring until disengaged. Avoid turning the entire assembly
Figure 14
Figure 15
CXH-A with Built in Disconnect Switch
(Must use HMK-00 Ceiling Mounting Kit)
CXH-A with Built in Thermostat
RENEWAL PARTS IDENTIFICATION
Publication Number
Title
PF458
PF461
PF462
Mounting Kits for Model CXH-EP
Material Safety Data Sheet Chromakool EG
Material Safety Data Sheet Chromakool PG
9
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RENEWAL PARTS IDENTIFICATION
Electrical Control Voltage
24V
120V
Contactor
072-304551-002
315-304252-002
315-304252-005
072-304551-102
315-304252-006
—
072-304551-008
315-304252-001
315-304252-003
072-304551-102
315-304252-007
315-304252-008
Transformer 208/240/480 PRI
Transformer 575 PRI
Aux. Contactor
Transformer 380/415 PRI
Transformer CXH-B
Transformer
Contactor
Figure 16
15
19
17
33
35
16
1
50
50
52
51
27
31
34
30
25
32
49
28
8
27
44
29
26
1
6
10
15
62
12
9
Figure 17
10
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MANUFACTURER PART NUMBER BREAKDOWN
(LOCATED ON UNIT NAMEPLATE)
CXH-A-I I - I I - I I - EP
Motor, Element and Heat Exchanger Parts
Common Parts
Item#
Shown in Figure 17
1/4 HP
Motor
Code CXH-A-03
05, 07&10
Part No.
CXH-A-15,
18 & 20
CXH-A-25,
Heat Exchanger*
Item 49
30 & 35
Part No.
Description
Model
Item 19
Part No.
CXH-A-03-81
CXH-A-03-83
CXH-A-03-21
CXH-A-03-23
CXH-A-03-43
CXH-A-03-63
CXH-A-05-81
CXH-A-05-83
CXH-A-05-21
CXH-A-05-23
CXH-A-05-43
CXH-A-05-63
CXH-A-07-81
CXH-A-07-83
CXH-A-07-21
CXH-A-07-23
CXH-A-07-43
CXH-A-07-63
CXH-A-10-83
CXH-A-10-21
CXH-A-10-23
CXH-A-10-43
CXH-A-10-63
CXH-A-15-83
CXH-A-15-23
CXH-A-15-43
CXH-A-15-63
CXH-A-18-23
CXH-A-20-43
CXH-A-20-63
193-302087-006
193-302087-007
193-302087-006
193-302087-007
193-302087-007
193-302087-008
193-302087-006
193-302087-007
193-302087-006
193-302087-007
193-302087-007
193-302087-008
193-302087-006
193-302087-007
193-302087-006
193-302087-007
193-302087-007
193-302087-008
193-302087-007
193-302087-006
193-302087-007
193-302087-007
193-302087-008
193-302087-007
193-302087-007
193-302087-007
193-302087-008
193-302087-007
193-302087-007
193-302087-008
1/2 HP Motors
353-304167-001
353-304167-001
353-304167-002
353-304167-002
353-304167-005
353-304167-006
353-304167-008
353-304167-008
353-304167-009
353-304167-009
353-304167-012
353-304167-013
353-304168-001
353-304168-001
353-304168-002
353-304168-002
353-304168-005
353-304168-006
353-304168-008
353-304168-009
353-304168-009
353-304168-012
353-304168-013
353-304169-001
353-304169-002
353-304169-005
353-304169-006
353-304169-008
353-304169-012
353-304169-013
1
6
8
9
Panel wrapper
Panel Bottom
Panel Front
Louver
Washer Shoulder
Spring
Terminal Box Cover
Screw 10-32
Fan Blade
Fan Guard
Enclosure
207-303891-001
207-303881-001
207-303883-001
182-303884-001
328-302074-002
276-130368-001
080-302079-001
248-073662-002
Consult Factory
134-302063-004
347-304561-001
345-075603-263
328-075528-085
328-075571-011
200-075473-044
221-302180-001
221-302180-003
354-302165-001
354-302243-001
Consult factory
207-303891-002
207-303881-002
207-303883-002
182-303884-002
328-302074-002
276-130368-001
080-302079-001
248-073662-002
Consult Factory
134-302063-005
347-304561-001
345-075603-263
328-075528-085
328-075571-011
200-075473-044
221-302180-001
221-302180-003
354-302165-001
354-302243-001
069-304115-002
Consult factory
207-303891-003
207-303881-003
207-303883-003
182-303884-003
328-302074-002
276-130368-001
080-302079-001
248-073662-002
Consult Factory
134-302063-006
347-304561-001
345-075603-263
328-075528-085
328-075571-011
200-075473-044
221-302180-001
221-302180-003
354-302165-001
354-302243-001
069-304115-002
Consult factory
10
12
14
15
16
17
25
26
27
28
29
30
31
32
33
34
35
44
50
51
52
62
75
Bolt 3/8-16, 1.5 lg
Washer flat
Washer lock
Hex Nut 3/8-16
Plug conduit 1/2"
Plug conduit 1"
Union conduit 3/4"
Union conduit 3/4"
Conduit Box
Conduit 3/4"
Plug conduit 3/4"
Bolt 5/16-18
Washer
Consult factory
221-302180-002
345-075603-218
328-075571-010
200-075473-039
080-042350-007
069-115087-049
221-302180-002
345-075603-218
328-075571-010
200-075473-039
080-042350-007
069-115087-079
221-302180-002
345-075603-218
328-075571-010
200-075473-039
080-042350-007
069-115087-093
Nut 5/16-18
Cover Exp. Proof
Conduit 3/4
Optional Equipment Parts
Description Part Number
CXH-A-25-43
CXH-A-25-63
CXH-A-30-43
CXH-A-30-63
CXH-A-35-43
CXH-A-35-63
193-302087-009
193-302087-010
193-302087-009
193-302087-010
193-302087-009
193-302087-010
353-304170-003
353-304170-004
353-304170-008
353-304170-009
353-304170-012
353-304170-013
Thermostat
300-113075-003
104-304328-001
104-304328-002
213-121103-017
213-121103-018
172-052561-004
172-052561-003
30 Amp Disconnect
60 Amp Disconnect
Pilot Light Ass’y 24V
Pilot Light Ass’y 120V
Pilot Lamp 24V
* For arctic duty conditions, heat exchanger with ethylene
glycol are required. Consult factory.
Pilot Lamp 120V
Mounting Kit Adapter
The factory must perform the replace-
ment of the immersion heater or
overtemperature cutout. The heat
exchanger seal must not be broken.
Consult factory for service.
CXH-A-03 through 10
CXH-A-15 through 20
CXH-A-25 through 35
027-302361-001
027-302361-002
027-302361-003
11
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Limited Warranty:
Please refer to the Chromalox limited warranty applicable to this product at
2150 N. RULON WHITE BLVD., OGDEN, UT 84404
Phone: 1-800-368-2493
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