2-506.14
GENERAL MAINTENANCE
General Maintenance
Unit heaters, like other electrical and mechanical equipment,
will give lasting trouble-free service if properly cared for.
Observance of a few simple periodic procedures will insure their
satisfactory operation.
Under average conditions, it is recommended that unit heaters
be inspected before every heating season.. more often in
locations where air is contaminated with corrosive fumes, dust,
soot, or oil spray. To perform routine maintenance:
1. Disconnect power supply to the unit.
2. Open junction box doors at top of unit and inspect unit
contactors, fuses, transformer, and tighten connections if
necessary.
3. Open side terminal box by removing panel at side of unit and
check element connections and the over-heat control switch.
4. Check motor mounting from bottom of unit. Check fan for
proper clearance, free rotation, and firm connection to motor
shaft. Remove air deflectors (if provided) for access.
5. Lubricate motor according to manufacturer’s instructions
on motor. When no instructions are on motor, oil every
two thousand hours of operation with SAE20 oil for
normal applications. Adjust oiling according to usage and
atmosphere. Some motors do not have oil fitting. These are
lubricated for long life and do not require further lubrication.
6. Routine cleaning of the outer unit casing and protective
screen is recommended to remove dirt, grease, or corrosive
material that may damage finish. Rusted or corroded spots
on top or bottom casing should be sanded and repainted.
7. Clean fan blades, elements, and inside casing with either
a detergent solution or compressed air. Do not scrape
elements.
8. For better element access or for more extensive cleaning of
the elements and screen, the screen can be easily removed.
Detach side terminal box cover and casing bottom before
removing protective screen.
10
WARNING
1. When servicing or repairing this equipment, use only
factory approved service replacement parts. A complete
replacement parts list may be obtained by contacting
Modine Manufacturing Company. Refer to the rating
plate on the unit for complete unit substitution of parts
or controls not approved by the factory will be at the
owner’s risk.
2. Do not operate any heater if it malfunctions. Disconnect
power at service panel and have heater inspected by a
qualified installation and service agency.
CAUTION
Do not reuse any electrical component which has been wet.
Such component must be replaced.
NOTE: To check most of the Possible Remedies in the
trouble-shooting guide listed in Table 11.1, refer to the
applicable sections of the manual.