Daikin GYEQ20AN Service Manual page 116

Actuator Control
[Cooling main, heating main A, heating, heating main B]
• When the engine is running at the minimum speed and yet the high-side pressure is higher
[Cooling]
• This valve is energized (turned ON).
[Heating]
• This valve is not energized (turned OFF).
[All modes]
• Compressor oil return valve.
[Cooling]
• Adjusts the refrigerant amount in the condenser to the optimal level. Synchronized with EV1.
[Heating]
• This valve is closed (turned OFF).
[All modes]
• Adjusts the compressor oil return amount.
[Cooling]
• Reduces the intake pipe resistance.
[Heating]
• This valve is closed (turned OFF).
[All modes]
• Adjusts the compressor oil return temperature to the optimal level.
[Heating, heating main B]
• When the fluid pressure is higher than the fluid pressure set-point, adjusts the fluid pressure
[Cooling]
• This valve is closed (turned ON).
[Cooling main, heating main A, heating, heating main B]
• Sends discharge gas to the heating indoor unit.
• During oil return, recovers refrigerating machine oil by switching from the discharge gas pipe
[Cooling]
• Switches from the discharge gas pipe to the low pressure gas pipe.
105
than the high-side pressure set-point, hot gas is bypassed to lower the high-side pressure.
Four-way valve
∗ (Cooling) This valve is not energized during circuit reverse control (turned OFF).
∗ This valve is energized during defrosting (turned ON).
SV3, SV4
SV6
SV7, SV9
SV10
SV12
SV13
by making the receiver gas flow to the low pressure side.
SV31
to the low pressure gas pipe.
SV32
SiAUY361411EA
Control and Functionality