Maintenance
Technical Catalogue
11
71
TCGB0051 rev 0 - 09/2009
11.7. Part replacement
Replacement of parts should be undertaken by ordering from the HITACHI Spare Parts List.
CAUTION:
Do not replace with spare parts which are not the equivalent.
11.8. Refrigeration cycle
¡ Strainer
Check for clogging each time when the refrigeration cycle is opened.
¡ Refrigerant Charge
Inspect the refrigerant charge of the system by checking the discharge and suction pressures. Perform a
leakage test, if any leakage is suspected, and always perform such a test after a refrigeration cycle component
is replaced. When refrigerant charge is required, follow the following instructions given for two cases:
1. When Refrigerant Gas Completely Leaked.
Before charging the entire cycle must be completely evacuated and dehydrated. A gauge manifold or
equivalent piping preparation shown below is recommended as a convenient procedure regarding both
charging and evacuation
- Fully open all the stop valves.
- Connect the evacuation line to the check joints of the high and the low pressure sides.
- Completely evacuate the entire cycle with a vacuum pump.
- Charge refrigerant to the refrigeration cycle by weighing the charging cylinder. The proper refrigerant
charge is listed on the nameplate.
- When charging by weight is stopped due to high ambient temperature, close the valve and operate the
unit after circulating the chilled water through the water cooler.
2. When Only Additional Refrigerant is Required.
Connect a gauge manifold to check joint of low pressure side, and connect a charge cylinder to gauge
manifold.
Operate the unit after circulating the chilled water.
Repeat the following procedure until pressure becomes proper (refer to page 44).
- Charge the gas refrigerant a little slowly into refrigeration cycle from check joint for low pressure.
- Check the pressure after refrigeration cycle becomes stable.
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