Chromalox CXH-A-35 Installation And Operation Instructions Manual - Page 3
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CXH-A Forced Air Heater for Hazardous Locations
Failure to understand and follow these installation instruc-
tions and the WARNING notes contained therein may result
in severe personal injury, death or substantial property dam-
age.
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 atmo-
sphere. Use only in atmospheres having an ignition tem-
perature 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 in-
vestigate 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
Explosion-proof
motor
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
NEMA 7 & 9 terminal enclosure
Mounting bolt
Integral, heavy duty
hanger connections
magnetic contactor
Built-in 120V control
circuit transformer
(Optional 24V available)
3
overheating of the element and shutting down the unit by
tripping the high temperature cutout.
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 lo-
cations.
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.
Polyester powder-coated
heavy gauge steel corrosion
resistant cabinet
aluminum-finned steel tubes
Optional service light to
indicate when unit
needs servicing
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