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HEATER MAinTEnAncE cHEcKLiST
For Electric Forced Air Heaters
Heater Model: _____________________________ Serial no.: _______________________________
Date of Maintenance: _______________________ Maintenance Done By: ____________________
comments: _________________________________________________________________________
__________________________________________________________________________________
WARning
Disconnect heater from the power supply before opening enclosures or servicing heater.
Lock the switch in the “OFF” (open) position and/or tag the switch to prevent unexpected power application.
This heater should only be serviced by personnel with heating and hazardous location equipment experience.
PERiODic (before and as required during heating season)
1. cLEAn
❑
Finned Tubes
2. cHEcK
❑
Motor for smooth, quiet operation
❑
Fan
❑
Louvers for proper angle and tightness
❑
Fan guard
❑
All explosion-proof covers for tightness
❑
Motor
❑
Louvers
Remove dust using compressed air. Do not spray with water or solvents.
Do not immerse in water or solvents.
AnnUAL (before heating season)
1. ELEcTRicAL
❑
check all terminal connections and conductors. Tighten loose connections. conductors with damaged insulation
must be replaced.
❑
inspect contactor contacts. if badly pitted, burned or welded shut, replace with factory supplied contactor.
❑
check fuses. Fuse rating and type are on printed circuit board. correct fuse must be in the active fuse clip. it is
recommended that a spare fuse be stored in the spare fuse clip.
❑
check all explosion-proof conduits. Replace damaged conduits. All threaded conduit connections must have
a minimum 5 turns engagement. Straight threaded conduit must protrude a minimum of 1/16” (1.6mm) inside
enclosures. Taper threaded connections must be at least hand tight.
❑
check electrical resistance on all load side legs. Reading should be balanced (± 5%).
2. MEcHAnicAL
❑
check for fluid leakage. The heater core is vacuum charged and contains ethylene glycol which is poisonous. if any
fluid leakage occurs from the heater, disconnect it from the power supply and have the core replaced. A factory
supplied exchange core can be shipped immediately from stock. Refer to the “Repair and Replacement” section for
details.
❑
check all enclosures. interior of enclosures must be clean, dry and free of foreign materials. Threaded covers must
be installed and hand tight.
note: Enclosure joints are metal to metal. Do not use gasket material or sealant in joints. A grease is applied to the
joints at the factory and should be left intact.
❑
check motor shaft bearing play. Replace motor if play is excessive, or if motor does not run quietly and smoothly.
Motor bearings are permanently lubricated.
❑
check fan. Replace immediately if cracked or damaged.
❑
check louvers. Louver screws should be tight. Louvers shall not be fully closed or override stops.
❑
check the tightness of all hardware. All nuts and bolts, including mounting hardware, must be tight.
❑
Turn heater on for a minimum of five minutes. check for warm air exiting heater through louvers. crackling or
pinging noises within heater during start-up are normal.
For assistance, please call
Toll Free: 1-800-661-8529
U.S. & canada