Function PACD011001C2
36 Function Urban Multi “MX1, ME1 Series” Using R-22
1.9 Pressure Equalization Control (ME1 Series)
The discharge gas and suction gas pipes are bypassed to eliminate differential pressure between the inlet
and outlet of the solenoid valve during HR box(e)s solenoid switching operations.
„
Equalizing operation demand
→
Pressure equalization solenoid valve (Y1S) is ON at following
conditions.
&
Operating condition of indoor unit with thermostat ON is different from the condition of HR boxes’ solenoid
valve (see page 38).
Not in startup control.
Liquid refrigerant not being discharged from accumulator.
Not in residual pump-down operation.
7 minutes passed after completion of previous pressure equalizing control operation.
Not in oil return control
Not in defrost operation
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