Chromalox PF490 5 User Manual

®
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.  
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
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
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
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
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
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
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
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  
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  
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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