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MAINTENANCE
Winter Shutdown
When shutting down the unit for winter, Clean the inside and outside of the unit, Pump down the
refrigerant to the condenser and close the unit gas inlet and liquid outlet stop valves. This unit is
preferably covered during shutdown, in order to protect it from dust and environmental conditions. Be
sure to tighten the packing glands and the cap nuts of the stop valves.
Spring Start-Up
After any extended shutdown period, prepare the unit for operation as follows:
1. Thoroughly inspect and clean the unit.
2. Clean or replace the air filters.
3. Clean the condensate drain lines.
4. Remove any accumulated dirt from the condenser and evaporator coils.
5. Check the fan belt tension.
6. Check the fan balance and try to operate the fan.
7. Inspect the refrigerant piping for leakage.
8. Tighten all wiring connections and access panels.
Replacement of Parts
Replacement of parts should be performed by ordering from the HITACHI Parts List. When part
replacement becomes necessary, prepare the parts given in the Parts List or the equivalent, as specified
in the HITACHI Recommended Spare Parts List. Do not replace with spare parts which are not
equivalent.
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