Chromalox CXH-A-18, CXH-A-05, CXH-A-20, CXH-A-25, CXH-A-07 Installation And Operation Instructions Manual
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Installation and Operation
Instructions
CXH-A Forced-Air Heater
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)
PF490-11
161-302421-004
June 2018
1
Table A - Specifications
Overall Dimensions (In.)
Model kW
CXHA-03 3 208/240V-1 or 3Ø
CXH-A-05 5 208/240V-1 or 3Ø
CXH-A-07 7.5 208/240V-1 or 3Ø
CXH-A-10 10 240V-1 or 3Ø
CXH-A-15 15 208/240/480V
CXH-A-18 18 240V-3Ø 43 61,420 1400 165 25 27-7/8 21 4-13/32 17-5/8
CXH-A-20 20 480/575V-3Ø 43 68,240 1400 165 25 27-7/8 21 4-13/32 17-5/8
CXH-A-25 25 480/575V-3Ø 54 85,300 2330 200 32-1/8 31-7/8 21-3/4 5-1/2 21-5/8
CXH-A-30 30 480/575V-3Ø 54 102,360 2330 200 32-1/8 31-7/8 21-3/4 5-1/2 21-5/8
CXH-A-35 35 480/575V-3Ø 54 119,420 2330 200 32-1/8 31-7/8 21-3/4 5-1/2 21-5/8
Voltage and
Phase
480/575V-3Ø
480/575V-3Ø
480/575V-3Ø
208/480/575V-3Ø
575V-3Ø
Horiz. Air
Discharge
(ft.)
28 10,236 700 127 19-1/8 23-7/8 21 3-1/2 13-5/8
28 17,060 700 127 19-1/8 23-7/8 21 3-1/2 13-5/8
32 25,590 840 133 19-1/8 23-7/8 21 3-1/2 13-5/8
32 34,120 840 138 19-1/8 23-7/8 21 3-1/2 13-5/8
47 51,180 1450 150 25 27-7/8 21 4-13/32 17-5/8
BTUH CFM
Wt.
(Lbs.)
A B C D E
5/8” UNC Tapped
Mounting Hole
Locations
2”
2”
E
A
B
A
11-1/16”
D
C
2
CXH-A Forced Air Heater for Hazardous Locations
Polyester powder-coated
NEMA 7 & 9 terminal enclosure
overheating of the element and shutting down the unit by
tripping the high temperature cutout.
Failure to understand and follow these installation instructions and the WARNING notes contained therein may result
in severe personal injury, death or substantial property damage.
1. To reduce the risk of ignition of hazardous atmo-
spheres: In accordance with the National Electrical
Code, do not install where operating temperature code
exceeds the ignition temperature of the hazardous atmosphere. Use only in atmospheres having an ignition temperature higher than 165˚C (329˚F).
2. Disconnect from supply circuit before opening enclo-
sures.
3. Hazard of Electric Shock. Heater must be effectively
grounded in accordance with N.E.C. to eliminate shock
hazard.
4. Heat exchanger contains Propylene Glycol under pres-
sure at operating temperature. A material safety data
sheet (MSDS) is available from Chromalox upon request.
Should leakage occur, remove unit from service and investigate cause.
5. Keep all electrical enclosure covers tightly closed and
secured with all bolts and threads. Cover joints must be
clean before replacing covers.
6. Install and operate in upright position only. Refer to Fig-
ure 3 for level requirements. Failure to comply will cause
7. All unused threaded openings not used for supply wiring
must be fitted with threaded plugs approved for use in
hazardous locations.
8. All unit electrical installation fittings, conduit, wiring and
seals must meet NEC and local codes for hazardous locations.
9. External line fusing or circuit breaker protection is re-
quired.
10. High temperature cutout(s) must never be bypassed in
the control circuit.
11. Alarm pilot lamp, if supplied, will turn on if the high tem-
perature cutout(s) actuates. Steady on lamp indicates
temperature cutout(s) has tripped. This could result if the
heat exchanger is obstructed (dirty), inlet air restricted or
fan not turning. Shut off power to unit and refer to repair
procedures section of instruction sheet.
12. Mounting clearances on nameplate must be observed.
13. Use copper wire for supply connections according to
size and rating on nameplate.
14. Do not install any type of gasket material on any of the
electrical junction box cover surfaces.
15. Do not attempt to override louver stops or operate unit
with louvers fully closed.
Explosion-proof
Explosion-proof
(NEMA 7 & 9)
controls enclosure
Motor connections
wiring access
Convenient terminal
block for room
thermostat protection
Protective housing
for immersion heater
terminal enclosure
Heavy duty immersion heater assembly
with high temperature cutout(s) and
motor
Integral, heavy duty
magnetic contactor
Mounting bolt
hanger connections
Built-in 120V control
circuit transformer
(Optional 24V available)
heavy gauge steel corrosion
resistant cabinet
Overpressure
protection device
Heavy gauge adjustable
louver with minimum
opening stops to direct air flow
Removeable front cover
for ease of cleaning
High efficiency heat
exchanger with integral
aluminum-finned steel tubes
Optional service light to
indicate when unit
needs servicing
3
General Information
The CXH-A series units rated 3 through 35 kW are designed
for operation in Class I, Div. 1, Groups C & D and Class II,
Div. 1, Groups E, F and G hazardous atmospheres having
an ignition temperature of 165°C (329°F) or higher. They are
designed for comfort heating and should not be operated in
ambient temperatures exceeding 40°C (104°F). All units in
Table A are UL listed.
The units are easily adapted for wall, ceiling or pole mounting. Refer to Figure 4 for mounting information. They are supplied with either 24 or 120 V internal control circuit voltage.
The heater is designed for use with an external hazardous
location thermostat or optional built-in thermostat. Standard
Installation
FIRE/EXPLOSION HAZARD. Mount only in upright position and observe nameplate mounting clearances.
Heater Location instructions:
Arrange units so their discharge air streams:
A. are subjected to a minimum of interference from col-
umns, machinery and partitions.
B. wipe exposed walls without blowing directly at them.
C. are directed away from room occupants in comfort heat-
ing.
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
discharge 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 provide 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 the use of a mounting kit (ceiling, wall or pole) available
from Chromalox. (Figures 5, 6 and 7)
model CXH-A unit heaters are factory equipped with an automatic reset type high temperature cutout.
The standard heater is designed to operate up to 7500
feet (2,286m) altitude. Consult factory for specific recommendations when using the units at higher altitudes.
The ceiling or wall mounting surface and the anchoring provision 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.
EXPOSED
EXPOSED
EXPOSED
EXPOSED
EXPOSED
EXPOSED
Figure 2
4
Maximum Out of Plane Allowance
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
maintained 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.
Do not mount mercury type thermostat directly on unit, vibration could cause malfunction.
1/2" Max
13mm
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 mounting 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.
102mm Min. (4")
Figure 4
204mm
Min.
(8")
Installation Clearances
5/8 NC (2)
Thds. For
Mounting
102mm
Min.
(4")
2"
5
Model # WMB-12 12” Fan (3-10 kW)
1”ø Hardware % Bolt
Single Poin
Swivel Mount
Supplied
& 5/8 NC Hardware
CXH-25EP through CXH-35 P=14-1/2”
CXH-25 through CXH-35 P=14-1/2”
A
Supplie
with 5/8 Bolts
ø 3/8 Hardware
Swivel Ceiling
Hanger S/A
Hardware
ø 5/8 Rods Length
Electrical Components
Pilot Lamp
Mounting Holes (2)
1” NP
Top Line Suppl
Entry
Unit Top View
Wall Mount Kit
Model # WMB-16 16” Fan (15-20 kW)
Model # WMB-20 20” Fan (25-35 kW)
12” Fan - 16-3/4”
16” Fan - 18-1/2”
t
20” Fan - 22”
Wall
Bracket
P
1/2 ø Hardware
Not Supplied
Adapter Bracket
Supplied
Single Point
Swivel 4”ø
Supplied
dapter Bracket
d
Pole or Wall Mount Kit
Model # PMB-12 12” Fan (3-10 kW)
Model # PMB-16 16” Fan (15-20 kW)
Model # PMB-20 20” Fan (25-35 kW)
Heater Mounting
Bracket Arm &
Hardware
P
Pole Support
Bracket
Figure 5
5/8” ø Hex Nuts
& Washers
Supplied for
Installation
Top & Bottom
Figure 7
CXH-03EP through CXH-10 P=10”
CXH-10EP through CXH-20 P=11-1/2”
Ceiling Mount Kit
Model # HMK-00
4-9/16
&
4-7/8
5-1/2” - 12” Fan
5-1/8” - 16” Fan
6-3/8” - 20” Fan
Cust. Supplied ø 1/2
Mounting Hardware.
Bracket Spacing suitable
for use with 4” U-Bolts
to suit 1” Min.
Threaded Ends
Customer
Supplied
Figure 6
3-1/2” SCH. 40 Pipe
or 4” O.D. X .25 Wall
Tube Cust. Supplied
Length to Suit
Pole Base
CXH-03 through CXH-10 P=10”
CXH-10 through CXH-20 P=11-1/2”
Cust. Supplied
ø 1/2 x 4” U-Bolts
& Hardware
Cust. Supplied
6” Ref.
3/8” ø Hardware
Required for
Mounting Cust. Supplied
Transformer
1” NPT
Figure 9
Jumper Wire
(Opt.)
Contactor
Heat
Exchanger
Wiring
Compartment
T
1/2” NPT
Thermostat Entry
Figure 10
6
y
5/8-11 Threaded
Wiring and Wiring Diagrams
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 ac
cordance with the National Electrical Code, NFPA 70.
ELECTRIC SHOCK HAZARD. Any installation involving electric heaters must be performed by a qualified person and must be effectively grounded in
accordance 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 frequency 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. Cover joints must be clean before replacing cover. Do not use any gasket material
on joint surfaces.
2. Use copper conductors only for supply wires. Refer to
nameplate 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.
4. The fan motor is factory wired at the same voltage, and
phase as the heating elements. All motors are thermally
protected and connected 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.
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 conduit and seal fittings
located as required by installation codes.
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.
-
Table B -Supply Wiring Requirements
Supply Wire
Model kW Phase Volts
CXH-A-03
CXH-A-03
CXH-A-03
CXH-A-03
CXH-A-03
CXH-A-03
CXH-A-05
CXH-A-05
CXH-A-05
CXH-A-05
CXH-A-05
CXH-A-05
CXH-A-07
CXH-A-07
CXH-A-07
CXH-A-07
CXH-A-07
CXH-A-07
CXH-A-10
CXH-A-10
CXH-A-10
CXH-A-10
CXH-A-10
CXH-A-15
CXH-A-15
CXH-A-15
CXH-A-15
CXH-A-18 18 3 240 6 60
CXH-A-20
CXH-A-202020
CXH-A-25
CXH-A-252525
CXH-A-30
CXH-A-303030
CXH-A-35
CXH-A-353535
7.5
7.5
7.5
7.5
7.5
7.5
10
10
10
10
10
15
15
15
15
3
1
3
3
3
3
3
5
5
5
5
5
5
208
3
208
1
240
3
240
3
480
3
575
1
208
3
208
1
240
3
240
3
480
3
575
1
208
3
208
1
240
3
240
3
480
3
575
3
208
1
240
3
240
3
480
3
575
3
208
3
240
3
480
3
575
3
480
3
575
3
480
3
575
3
480
3
575
3
480
3
575
10
14
12
14
14
14
8
12
10
12
14
14
6
10
6
10
14
14
8
6
8
12
14
6
6
10
12
8
10
8
8
6
8
6
8
Max Fuse
Amps90˚C Size (ga)
25
15
20
15
15
15
35
20
30
20
15
15
50
30
45
25
15
15
40
60
35
20
15
60
50
25
20
35
30
40
35
50
40
60
50
7. Installation must include appropriate over current protec-
tion 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 hazard-
ous 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 terminals. 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 conduit wiring entry on top of the
terminal enclosure should be used to wire the thermostat
to the heater (Figure 10).
7
9. Protection against overheating is provided by a high
temperature cutout 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 high temperature cutout. The
high temperature cutout is also designed to shut down
the unit completely if the fluid level is low or other heater
malfunction occurs.
High Temperature cutout(s) 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.
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 hazardous 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.
GND
Contactor
Refer to Nameplate
for Input Voltage
1PH
L1 L2
L1 L2 L3
Optional
Disconnet
Switch
Optional Aux. Cont.
Auto Reset
High Limit
Transformer Color Code Tabulation
PRI
VOLT.
208 BLK RED BLK WHT YEL BLU
240 BLK ORG BLK WHT YEL BLU
380 BLK VIO BLK WHT YEL BLU
415 BLK YEL BLK WHT – –
415 BLK BRN – – YEL BLU
480 BLK BLK/RED BLK WHT YEL BLU
575/600 BLK GRY BLK WHT YEL BLU
Primary
H2
R
Optional Alarm
X2
Secondary
Terminal
Block
H1
X1
T3
T2
T1
PRI. XFMR
LEAD CLRS.
H1 H2 X1 X2 X1 X2
Control Transformer
Refer to Nameplate for Primary (Input)
and Secondary (Control) Voltage.
Built-In or
External
Thermostat
Remove this Wire when
Using Thermostat
120V SEC
LEAD CLRS.
Connect Thermostat Wires
to the Common and Normally
Closed Terminals of One Pole
on the Thermostat.
24V SEC
LEAD CLRS.
Motor
1PH
Elements
Diagram I - 1 PH Wiring
Manual Reset
High Limit
Optional
8
Refer to Nameplate
for Input Voltage
1PH
L1 L2
GND
Optional
Disconnet
Switch
Optional Aux. Cont.
Transformer Color Code Tabulation
PRI
VOLT.
PRI. XFMR
LEAD CLRS.
120V SEC
LEAD CLRS.
24V SEC
LEAD CLRS.
H1 H2 X1 X2 X1 X2
208 BLK RED BLK WHT YEL BLU
240 BLK ORG BLK WHT YEL BLU
380 BLK VIO BLK WHT YEL BLU
415 BLK YEL BLK WHT – –
415 BLK BRN – – YEL BLU
480 BLK BLK/RED BLK WHT YEL BLU
575/600 BLK GRY BLK WHT YEL BLU
Primary
H2
R
H1
Control Transformer
Refer to Nameplate for Primary (Input)
and Secondary (Control) Voltage.
L1 L2 L3
Elements
Motor
Contactor
Motor
1PH
L2 L1
Heater
Contactor
Diagram II - 1 PH Wiring with Fan Switch
Secondary
X2
Optional Alarm
(Red)
Fan
(Heat)
White
X1
T3
T2
T1
Auto Reset
High Limit
Manual Reset
Built-In or
External
Thermostat
Remove this Wire when
Using Thermostat
High Limit
Optional
Connect Thermostat Wires
to the Common and Normally
Closed Terminals of One Pole
on the Thermostat.
9
GND
Contactor
Refer to Nameplate
for Input Voltage
3PH
L1 L2 L3
L1 L2 L3
Optional
Disconnet
Switch
Optional Aux. Cont.
Auto Reset
High Limit
R
Primary
H2
X2
Secondary
Optional Alarm
Transformer Color Code Tabulation
PRI
VOLT.
PRI. XFMR
LEAD CLRS.
120V SEC
LEAD CLRS.
24V SEC
LEAD CLRS.
H1 H2 X1 X2 X1 X2
208 BLK RED BLK WHT YEL BLU
240 BLK ORG BLK WHT YEL BLU
380 BLK VIO BLK WHT YEL BLU
415 BLK YEL BLK WHT – –
415 BLK BRN – – YEL BLU
480 BLK BLK/RED BLK WHT YEL BLU
575/600 BLK GRY BLK WHT YEL BLU
H1
Control Transformer
Refer to Nameplate for Primary (Input)
and Secondary (Control) Voltage.
Built-In or
External
Thermostat
Connect Thermostat Wires
to the Common and Normally
Closed Terminals of One Pole
on the Thermostat.
Remove this Wire when
Using Thermostat
Terminal
Block
X1
T3
T2
T1
Motor
3PH
Diagram III - 3 PH Wiring
Elements
Manual Reset
High Limit
Optional
10
GND
Electric Blower Unit Heater for Hazardous Locations
Heating Element Rating
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
Heater Voltage
2 = 240V 6 = 575V
3 = 380V 8 = 208V
4 = 480V 9 = 600V
5 = 415V
Phase
1 = 1 Phase
3 = 3 Phase
30 = 24V Controls
32 = 120V Controls
00 = No Thermostat
40 = Thermostat
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
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
CXH-A
104033401 PE1
Explosion Proof
MODEL NUMBER DESCRIPTION
Heater
Contactor
Refer to Nameplate
for Input Voltage
3PH
L1 L2 L3
L1 L2 L3
Optional
Disconnet
Switch
Optional Aux. Cont.
R
Primary
H2
X2
Secondary
Optional Alarm
Transformer Color Code Tabulation
PRI
VOLT.
208 BLK RED BLK WHT YEL BLU
240 BLK ORG BLK WHT YEL BLU
380 BLK VIO BLK WHT YEL BLU
415 BLK YEL BLK WHT – –
415 BLK BRN – – YEL BLU
480 BLK BLK/RED BLK WHT YEL BLU
575/600 BLK GRY BLK WHT YEL BLU
PRI. XFMR
LEAD CLRS.
H1 H2 X1 X2 X1 X2
H1
Control Transformer
Refer to Nameplate for Primary (Input)
and Secondary (Control) Voltage.
Auto Reset
X1
High Limit
120V SEC
LEAD CLRS.
Manual Reset
High Limit
24V SEC
LEAD CLRS.
Motor
Contactor
Motor
3PH
L2 L1
Elements
Diagram IV - 3 PH Wiring with Fan Switch
(Red)
Fan
Heat
(White)
Built-In or
External
Thermostat
T3
T2
T1
Connect Thermostat Wires
to the Common and Normally
Closed Terminals of One Pole
on the Thermostat.
Remove this Wire when
Using Thermostat
Optional
11
Operation
2. The finned structure of the heat exchanger must be kept
clean and free of accumulated dust and dirt. The cabi-
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 releases its heat energy to the finned radiator as it rises and recondenses back to the bottom
reservoir to be reheated. This cycle will continue as long
as fan forced air is available on the finned structure to
remove the heat to the airstream.
net 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 high temperature cutout(s)
has a been activated. During unit startup, the lamp will
flash on momentarily to verify its operation.
Maintenance and Repair
Maintenance and repair MUST be performed by qualified personnel only.
immediately. In case of eyes or skin contact, wash affected areas with large amounts of water. The MSDS (Mate-
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.
1. Periodically inspect all electrical connections and termi-
nals 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 element. Compare measured values to the correct
currents as listed on the unit nameplate.
4. The thermally protected fan motor is permanently lubri-
cated 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.
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 replacement blade only.
6. Check for any sign of leaking from the heat exchanger.
Too little fluid will cause the high temperature cutout(s) to
trip or cycle. Periodically inspect the heater for leaks by
visual examination using a flashlight. Look for evidence
of fluid dunning down the face of the heat exchanger
from the top center. Look for evidence of fluid inside the
lower terminal enclosure and look for any fluid that may
have dripped or pooled in the sheet metal case. If evidence of fluid leaking from the heat exchanger is found,
the unit should be removed from service and the cause
investigated. The heat exchanger is a sealed unit and can
only be serviced by returning to the factory.
7. The sealed heat exchanger contains a glycol/water solu-
tion of propylene glycol. Ethylene glycol is supplied for
arctic duty conditions only. Avoid contact with skin and
eyes. If ingestion should occur, seek medical attention
-
rial Safety Data Sheet) for these materials is available
upon request.
I. REPLACING THE HEAT EXCHANGER
BURN HAZARD. Be sure heat exchanger and fluid
has been allowed to cool to 110°F before proceeding.
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 OPTIONAL MANUAL RESET HIGH
TEMPERATURE CUTOUT
EXPLOSION HAZARD. Be sure that all enclosure
covers are replaced and tightly closed before re-energizing unit after servicing electrical components.
High temperature cutout(s) must never be bypassed
in control circuit.
The factory must perform the replacement of the
immersion heater or high temperature cutout. The
heat exchanger seal must not be broken. Consult
factory for service.
Resetting the cutout multiple times without resolving the cause of the tripping may allow the heater
to operate in an unsafe condition. Failure to investigate and resolve a trip condition could result in
personal injury or property damage.
12
Maintenance and Repair
The occurrence of the manual reset limit control to trip is an
abnormal condition. Care should be taken to determine the
exact reason that the high limit control tripped before a manual reset of the limit control. 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.
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 12
5-3/4"
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 cov-
er 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 dis-
connect all wires leading to the motor. All motor wires
are permanently marked according to the nameplate
on the motor.
E. Remove 4 bolts in motor base holding it to rear cabi-
net shelf. See Figure 13.
F. Remove 4 screws holding fan guard to cabinet.
Figure 13
G. Unthread union at motor wiring outlet nipple connec-
tion. Carefully lift the motor, fan blade, and guard off of
the cabinet.
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.
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 tighten (5 threads minimum). Replace bolts in motor base and reattach fan guard to back of housing
in four places. Recheck blade rotation and tighten all
hardware.
13
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 nameplate, previous notes, and marked
wires, reconnect the motor for the unit voltage rating
as indicated on the heater nameplate. 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.
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 con-
nection 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 servicing heater. Failure to comply could result in per-
sonal 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).
1. CONTROL TRANSFORMER
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 orientation 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 which is held tight to the enclosure with
a locking nut on the 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 reenergizing unit. Lamp should flash on momentarily
when unit is energized. See renewal parts section for part
number of replacement bulbs.
CXH-A with Built in Disconnect Switch
Figure 14
(Must use HMK-00 Ceiling Mounting Kit)
CXH-A with Built in Thermostat
Figure 15
14
Renewal Parts Identification
Publication Number Title
PF458 Mounting Kits for Model CXH-EP
PF461 Material Safety Data Sheet Chromakool EG
PF462 Material Safety Data Sheet Chromakool PG
Electric Control Voltage 24V 120V
Contactor 072-304551-002 072-304551-008
Transformer 208/240/480 PRI 315-304252-002 315-304252-001
Transformer 575 PRI 315-304252-005
Aux. Contactor
Transformer 380/415 PRI
Transformer CXH-B
072-304551-102 072-304551-102
315-304252-006 315-304252-007
— 315-304252-008
315-304252-003
Transformer
Figure 16
Contactor
15
19
15
33
35
50
51
52
34
32
31
25
44
26
15
17
16
30
28
27
29
75
6
62
1
50
27
49
8
15
CO
10
Figure 17
12
9
16
Manufacturer Part Number Breakdown
(Located On Unit Nameplate)
CXH-A-
h h
-
h h
Common Parts Shown in Figure 17
Code CXHA-03,
Item# Description
1 Panel wrapper 207-303891-001 207-303891-002 207-303891-003
6 Panel Bottom 207-303881-001 207-303881-002 207-303881-003
8 Panel Front 207-303883-001 207-303883-002 207-303883-003
9 Louver 182-303884-001 182-303884-002 182-303884-003
10 Washer Shoulder 328-302074-002 328-302074-002 328-302074-002
12 Spring 276-130368-001 276-130368-001 276-130368-001
14 Terminal Box Cover 080-302079-001 080-302079-001 080-302079-001
15 Screw 10-32 248-073662-002 248-073662-002 248-073662-002
16 Fan Blade Consult Factory Consult Factory Consult Factory
17 Fan Guard 134-302063-004 134-302063-005 134-302063-006
25 Enclosure 347-304561-001 347-304561-001 347-304561-001
26 Bolt 3/8-16, 1.5 lg 345-075603-263 345-075603-263 345-075603-263
27 Washer flat 328-075528-085 328-075528-085 328-075528-085
28 Washer lock 328-075571-011 328-075571-011 328-075571-011
29 Hex Nut 3/8-16 200-075473-044 200-075473-044 200-075473-044
30 Plug conduit 1/2” 221-302180-001 221-302180-001 221-302180-001
31 Plug conduit 1” 221-302180-003 221-302180-003 221-302180-003
32 Union conduit 3/4” 354-302165-001 354-302165-001 354-302165-001
33 Union conduit 3/4” 354-302243-001 354-302243-001 354-302243-001
34 Conduit Box Consult factory 069-304115-002 069-304115-002
35 Conduit 3/4” Consult factory Consult factory Consult factory
44 Plug conduit 3/4” 221-302180-002 221-302180-002 221-302180-002
50 Bolt 5/16-18 345-075603-218 345-075603-218 345-075603-218
51 Washer 328-075571-010 328-075571-010 328-075571-010
52 Nut 5/16-18 200-075473-039 200-075473-039 200-075473-039
62 Cover Exp. Proof 080-042350-007 080-042350-007 080-042350-007
75 Conduit 3/4 069-115087-049 069-115087-079 069-115087-093
05, 07 & 10
Part No.
CXH-A-15,
18 & 20
Part No.
CXH-A-25,
30 & 35
Part No.
Optional Equipment
Optional Equipment Parts
Description Part Number
Thermostat 300-113075-003
30 Amp Disconnect 104-304328-001
60 Amp Disconnect 104-304328-002
Pilot Light Ass’y 24V 213-121103-017
Pilot Light Ass’y 120V 213-121103-018
Pilot Lamp 24V 172-052561-004
Pilot Lamp 120V 172-052561-003
Mounting Kit Adapter
CXH-A-03 through 10 027-302361-001
CXH-A-15 through 20 027-302361-002
CXH-A-25 through 35 027-302361-003
The factory must perform the replacement of the
immersion heater or high temperature cutout. The
heat exchanger seal must not be broken. Consult
factory for service.
h h
-
- EP
Motor, Element & Heat Exchanger Parts
Model
CXH-A-03-81 193-302087-006 353-304167-001
CXH-A-03-83 193-302087-007 353-304167-001
CXH-A-03-21 193-302087-006 353-304167-002
CXH-A-03-23 193-302087-007 353-304167-002
CXH-A-03-43 193-302087-007 353-304167-005
CXH-A-03-63 193-302087-008 353-304167-006
CXH-A-05-81 193-302087-006 353-304167-008
CXH-A-05-83 193-302087-007 353-304167-008
CXH-A-05-21 193-302087-006 353-304167-009
CXH-A-05-23 193-302087-007 353-304167-009
CXH-A-05-43 193-302087-007 353-304167-012
CXH-A-05-63 193-302087-008 353-304167-013
CXH-A-07-81 193-302087-006 353-304168-001
CXH-A-07-83 193-302087-007 353-304168-001
CXH-A-07-21 193-302087-006 353-304168-002
CXH-A-07-23 193-302087-007 353-304168-002
CXH-A-07-43 193-302087-007 353-304168-005
CXH-A-07-63 193-302087-008 353-304168-006
CXH-A-10-83 193-302087-007 353-304168-008
CXH-A-10-21 193-302087-006 353-304168-009
CXH-A-10-23 193-302087-007 353-304168-009
CXH-A-10-43 193-302087-007 353-304168-012
CXH-A-10-63 193-302087-008 353-304168-013
CXH-A-15-83 193-302087-007 353-304169-001
CXH-A-15-23 193-302087-007 353-304169-002
CXH-A-15-43 193-302087-007 353-304169-005
CXH-A-15-63 193-302087-008 353-304169-006
CXH-A-18-23 193-302087-007 353-304169-008
CXH-A-20-43 193-302087-007 353-304169-012
CXH-A-20-63 193-302087-008 353-304169-013
CXH-A-25-43 193-302087-009 353-304170-003
CXH-A-25-63 193-302087-010 353-304170-004
CXH-A-30-43 193-302087-009 353-304170-008
CXH-A-30-63 193-302087-010 353-304170-009
CXH-A-35-43 193-302087-009 353-304170-012
CXH-A-35-63 193-302087-010 353-304170-013
* For arctic duty conditions, heat exchanger with
ethylene glycol are required. Consult factory.
1/4 HP Motor
Item 19
1/2 HP Motors
Heat Exchanger*
Item 19
17
Please refer to the Chromalox limited warranty applicable to this product at
http://www.chromalox.com/customer-service/policies/termsofsale.aspx.
© 2016 Chromalox, Inc. All rights reserved.
Limited Warranty:
Chromalox
103 Gamma Drive
Pittsburgh, PA 15238
(412) 967-3800
www.chromalox.com
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