MAINTENANCE PROCEDURE MAINTENANCE
4-42
CHECK AND MAINTENANCE AIR CONDITIONER 4
Check Level of Refrigerant (gas)
If the refrigerant used in the air conditioner gets into your eyes or on your hands, it may cause loss of
sight or frostbite. Do not touch the refrigerant. Never loosen any part of the refrigerant circuit.
Do not bring any flame close to any point where the refrigerant gas is leaking.
If there is a lack of refrigerant (gas), the cooling performance
will be poor. When operating the air conditioner at high speed
with the engine at full throttle, use the receiver sight glass
(inspection window) to check the condition of the refrigerant
gas (R134a) flowing in the refrigerant circuit.
(A) No bubbles in refrigerant flow: Suitable
(B) Some bubbles in flow (bubbles pass continuously):
Lack of refrigerant
(C) Colorless, transparent: No refrigerant
When bubbles appear, there is lack of refrigerant gas, so have
your service shop add refrigerant immediately. If the air condi-
tioner is run when there is lack of refrigerant gas, it will cause
damage to the compressor.
Total volume of refrigerant: 0.95 kg (2.095 lb)/each unit [total
for 2 units: 1.9 kg (4.19 lb)]
Inspection During Off Season
During the off-season, run the air conditioner once a month for 3-5 minutes at low idling to maintain the oil film at
all parts of the compressor.
Inspection and Maintenance Items
Check, maintenance items Content of check, maintenance
Guideline for maintenance inter-
val
Refrigerant (gas) Charge amount Twice a year (spring, autumn)
Air conditioner condenser Clogged fins Every 500 hours
Compressor Operating condition Every 4000 hours
V-belt Damage, tension Every 250 hours
Blower motor, fan
Operating condition
(does it make abnormal noise?)
When required
Control mechanism Operating condition (does it function normally?) When required
Piping mounts
Mounting condition, looseness at tightening or
connecting portions, leakage of gas, damage
When required
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