PERIODIC SEASON CHECK-UP
Proposed Maintenance Advisory —
Inspect the Evaporator Coil to see that it is free of dust,
leaves, and other foreign material which may have been drawn
through the air filter. Debris on the evaporator coil or fan
blades will impair the cooling efficiency and reduce the air
flow. Remove the debris by using a vacuum hose or air hose.
Use care to prevent possible damage to near-by components such
as blower wheels, wiring and capillary tubes. ASSURE THAT THE
CONDENSATE DRAIN HOSE IS CLEAR OF ALL DEBRIS.
The Condenser Coil should be periodically cleaned in the same
way to remove insects, leaves, straw, and other debris. A partially
blocked condenser will cause excessive head pressure and reduce
the cooling performance of the system and shorten the compressor
and clutch life.
Inspect belts for proper tension. Loose belts cause slippage
which results in intermittent cooling and BELT DAMAGE.
Belts under excessive tension will place damaging
stress on the clutch,
compressor bearings and crankshaft. Too much tension
will also reduce flex life of the belt. Retighten
loose compressor belts
to 100 lbs.
Inspect alignment of the clutch to the drive pulley.
If the compressor has shifted out of alignment, belt
bearing failure will result. Drive belt misalignment
must not exceed .01 inch per inch. (1/8” per
If the system is a combination heater and air conditioner,
check to assure WATER VALVE SHUTS OFF WATER FLOW
TO THE HEATER CORE.
Check the sight glass to determine the level of Freon.
Run the engine at 1200-1500 RPMs and return to idle.
appear continuously, there is a possibility of a
refrigerant leak. IF THE AMBIENT TEMPERATURE IS BELOW
70 DEGREES F. THE SIGHT GLASS MAY SHOW BUBBLES EVEN WITH
Inspect the hoses for abrasion or wear, particularly
at bends, clamps, or in areas that may rub against
parts of the machine.
Check compressor discharge hose for bake out hardness
close to compressor.
Inspect the drain hose leading from the evaporator.
It should not be forced into the unit as to cause
looping which restricts
the natural flow of moisture. Restricted drainage
due to kinking or accumulation of dirt and debris
will over flow the condenser
drainage system and cause leaking of the unit.
Nuts and bolts on the compressor mounting bracket
and clutch should be tightened securely before inspecting
the belt tension and pulley alignment. Recheck the
pulley for alignment with unit operating.