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
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