
ROTARY COMPRESSOR CRITERIA FOR LONG LIFE
REFRIGERATION SYSTEM
1. SYSTEM DESIGN LIMITATIONS
1.1 Powersource and Voltage
Voltage applied to hermetic terminal should be within the range mentioned
in this specification.
In the case of three phase, the phase imbalance should be within 3% among
the compressor terminals. The phase imbalance should be calculated
according to the follow formula.
The phase imbalance=
(V)mean
(V)max: maximum voltage among the three terminals
(V)mean: average voltage among the three terminals.
1.2 Operating Temperatures and Pressures
The operating temperatures and pressures of the compressor should be
within the range shown in the table 2.
1.3 Operating and Shut-off Period
The compressor should be operated continuously at least for 5 minutes after
being turned ON.
3 minutes shut-off time should be ensured at least until restarting.
1.4 Liquid Refrigerant Back
When knocking noise, current increase and undesirable vibration are caused,
another accumulator should be equipped to the compressor and/or refrigerant
charge should be reduced to prevent liquid refrigerant back.