PACD011001C2 Function
Function Urban Multi “MX1R, ME1R Series” Using R-407C 251
1.9 Pressure Equalization Control (ME1R 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 boxes 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 253).
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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