. MAINTENANCE MAINTENANCE PROCEDURE Inspection and Maintenance Items 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 when required 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 4 - 37