OM 1263 • MICROTECH UNIT CONTROLLER 68 www.DaikinApplied.com
4 Way Reversing Valve Control (4WV) –
Heat Pump Units Only
4WV is energized (On) when the unit is in the MinDAT or
Heating operating state. 4WVG is de-energized (OFF) when
the unit is in the Cooling operating state.
NOTE: Once switched, the 4WV remains in the new position
until the unit’s state changes from Cooling to MinDAT
or Heating or viceversa.
Receiver Solenoid Valve Control (SVR)
DPS heat pump units include a receiver solenoid valve that is
used to direct the refrigerant to the receiver while switching the
valve during the defrost cycle. The SVR valve is closed most
of the time but is opened at certain points in the defrost cycle
and in the Pumpdown and Standby for Restart compressor
operating states.
Bypass Solenoid Valve Control (SVB)
DPS units include a bypass solenoid valve that opens when
necessary to bypass refrigerant from the high to the low
side of the inverter compressor to reduce the load on the
compressor. The bypass solenoid is closed most of the time.
Refer to the descriptions of the compressor operating states
and protection control functions for details regarding when the
bypass valve is opened.
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