© 2020 Chromalox,
6. Operation
•
The CXH-A/B unit heaters use a sealed water-glycol filled heat
exchanger. The electric immersion elements transfer heat en-
ergy directly to the fluid generating a fluid/vapor mixture which
releases its heat energy to the finned radiator as it rises and
condenses 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.
•
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 peri-
odic cleaning.
General
•
Stand clear of front of heater to avoid possible injury.
•
Unless fitted with the optional 3 position selector switch, heater
should immediately start once power is supplied.
•
In temperatures below -20°C, the fan may not begin rotating
for several seconds. This is normal as the motor and heat
exchanger must heat up the entire unit in order for it to begin
rotating.
•
Prior to startup, ensure that heater has been properly installed
per this manual and local requirements.
•
When starting up after long period of in-operation, ensure that
proper maintenance procedures have been performed. Not
following preventative maintenance procedures can lead to
potential dangerous operating conditions.
Startup
•
Unit should not be operated with louvers fully closed. Mechani-
cal stops are incorporated into the design of the cabinet to limit
the degree of closure. Do not force the louvers beyond these
stops.
•
If specified, units are supplied with built in alarm pilot lamps
which will energize when abnormal conditions occur. Review
troubleshooting section for information on addressing these
situations.
•
Do not operate in ambient temperatures exceeding 40°C
(104°F).
Manual and Automatic Reset Thermal Cutout
•
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 e changer seal must not be broken. Consult factory
for service.
•
Resetting the manual 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 condi-
tion could result in personal injury or property damage.
•
The automatic and manual reset limit controls are located in
the heating element hazardous location enclosure on the heat
exchanger which is covered by the sheet metal housing at-
tached 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.
•
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.
•
The automatic reset limit control does not require reset-
ting. If nuisance tripping occurs, consult maintenance
and troubleshooting sections. Do not try to remove or
replace.
Summary of Contents for CXH-A/B Series
Page 6: ... 2020 Chromalox 3 Specifications and Product Identification Cont ...
Page 10: ... 2020 Chromalox 5 Electrical Installation Cont Diagram 1 ...
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