OM 1263 • MICROTECH UNIT CONTROLLER 68 www .DaikinApplied .com
Heat Pump
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 .
Summary of Contents for MicroTech III DPS
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