Periodic; Annual - Modine Manufacturing HEX6 Series Installation, Parts, Service, And Maintenance Manual

A.2 Periodic
(before and as required during heating season)
• Clean
Motor
…
Louvers
…
Finned Tubes
…
Fan
…
Fan Guard
…
A.3 Annual
(before heating season)
• Mechanical Check
Fluid leakage. The heater core is vacuum
…
charged and contains proprietary heat
transfer fluid. Inspect the Pressure Relief
Device label indicator for signs of rupture and
degradation. If the paper is torn, disintegrated
or otherwise compromised this is an
indication that fluid has leaked from the core.
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 from stock.
Refer to Section Repair & Replacement, page
17 for details.
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
Motor shaft bearing play. Replace motor if
…
play is excessive, or if motor does not run
quietly and smoothly. Motor bearings are
permanently lubricated.
Fan. Replace immediately if cracked or
…
damaged.
Louvers. Screws should be tight. Louvers shall
…
not be fully closed or override stops.
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.
4 4
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 for smooth, quiet operation
…
Louvers for proper angle and tightness
…
All explosion-proof covers for tightness
…
Pressure relief device for signs of leakage.
…
See Figure 1, page 5 and refer to A.3 Annual,
page 4, for further instructions.
• 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. For severe duty conditions such as
arctic duty or drilling rigs, Modine recommends
the contactor be replaced every two years.
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.
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" (1.6 mm) inside enclosures. Taper threaded
connections must be at least hand tight.
Electrical resistance on all load side legs. Reading
…
should be balanced (± 5%).
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