24. SERVICE PROCEDURE 24.2.10 CHECK, MAINTAIN AIR CONDITIONER (ONLY MACHINES WITH AIR CONDITIONER) CHECK LEVEL OF REFRIGERANT (GAS) WARNING If the refrigerant used in the cooler gets into your eyes or on your hands, it may cause loss of sight or frostbite, so never loosen any part of the refrigerant circuit. If the level of the refrigerant (gas) is low, the cooling effect will be reduced. Run the engine at high idling, and check the flow of the refrigerant gas (freon 134a) in the refrigerant circuit through the sight glass of the receiver when the cooler is running at high speed. No bubbles in refrigerant flow: Suitable Some bubbles in flow (bubbles pass continuously):
Lack of refrigerant Colorless, transparent: No refrigerant REMARK When there are bubbles, the refrigerant gas level is low, so contact your refrigerant dealer to have refrigerant added. If the air conditioner is run with the refrigerant gas level low, it will cause damage to the compressor. AM091400 INSPECTION DURING OFF-SEASON Even during the off-season, run the compressor at low speed for 3 – 5 minutes once a month to prevent the loss of the oil film at the lubricated parts of the compressor.
Sight glass Suitable Lack of refrigerant No refigerant (colorless, transparent) Receiver AD053280 Table of cooler check and maintenance items 3-40 Check, maintenance items Content of check, maintenance Guideline for maintenance interval Refrigerant (gas) Charge amount Twice a year (spring, autumn) 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