Normal Operation - Daikin VRV-WIII RWEYQ72PTJU Service Manual

Function General
1.3

Normal Operation

Parts Name
Inverter compressor
Inverter cooling fan
Four-way valve (Main)
Four-way valve (Sub)
Electronic expansion valve
(Main)
Electronic expansion valve
(Subcooling)
Solenoid valve (Hot gas)
Solenoid valve (Oil return of
water heat exchanger)
Solenoid valve (Receiver
gas charging)
Solenoid valve (Receiver
gas vent)
Solenoid valve (Non-
operating unit liquid pipe
closing)
Indoor unit fan
Indoor unit electronic
expansion valve
Branch Selector unit
42
Electric
Symbol
Symbol
— M1C
— M1F, M2F
20S1 Y5S
20S2 Y7S
EV1 Y1E
EV3 Y3E
SVP Y1S
SVE Y2S
SVL Y3S
SVG Y4S
SVSL Y6S
— M1F, M2F
— Y1E (Branch Selector unit & Indoor unit
Actuator Function
Normal cooling
PI control, High pressure
protection, Low pressure
protection, Discharge pipe
temperature protection control,
Inverter protection control
Inverter cooling fan control
OFF
OFF
Heat exchanger mode control
(In case of cooling operation)
Y3E control
Protection control
OFF
Receiver pressurizing control
OFF
ON
Refer to following page for detail.
operation mode detail)
SiUS30-1301
Normal heating or normal cooling/
heating simultaneous operation
PI control, High pressure
protection, Low pressure
protection, Discharge pipe
temperature protection control,
Inverter protection control
Inverter cooling fan control
ON
Heat exchanger mode control
(In case of heating and
simultaneous cooling/heating
operation)
Heat exchanger mode control
(In case of heating and
simultaneous cooling/heating
operation)
Y3E control
Protection control
Water heat exchanger oil return
control
Receiver pressurizing control and
drift protection control
Drift protection control
ON
Refer to following page for detail.
(Branch Selector unit & Indoor unit
operation mode detail)
Function and Control