Daikin VRV - WII, Service Manual

Page: 70 / 312

SiUS30-604 Function General
Function 57
1.3 Normal Operation
Parts name Symbol
Electrical
symbol
Actuator function
Normal cooling
Normal heating or normal cooling/
heating simultaneous operation
Compressor — (M1C)
PI control, High pressure protection,
Low pressure protection, Discharge
pipe temperature protection control,
Inverter protection control
PI control, High pressure protection,
Low pressure protection, Discharge
pipe temperature protection control,
Inverter protection control
Inverter cooling fan — (M1, 2F) Inverter cooling fan control Inverter cooling fan control
4 way valve (Main) 20S1 (Y5S) OFF ON
4 way valve (for
heat exchanger)
20S2 (Y7S) OFF
Heat exchanger mode control
(In case of heating and simultaneous
cooling/heating operation)
Main heat
exchanger
electronic exp.
valve
EV1 (Y1E)
Heat exchanger mode control
(In case of cooling operation)
Heat exchanger mode control
(In case of heating and simultaneous
cooling/heating operation)
Sub-cooling
electronic exp.
valve
EV3 (Y3E) EV3 control EV3 control
Hot gas bypass
solenoid valve
SVP (Y1S) Protection control Protection control
Water heat
exchanger oil return
solenoid valve
SVE (Y2S) OFF Water heat exchanger oil return control
Receiver gas
charging solenoid
valve
SVL (Y3S) Receiver pressurising control
Receiver pressurising control and drift
protection control
Receiver gas
discharge solenoid
valve
SVG (Y4S) OFF Drift protection control
Non-operation unit
liquid pipe stop
solenoid valve
SVSL (Y6S) ON ON
Indoor unit fan — —
Refer to following page for detail.
(BS unit & Indoor unit operation mode
detail)
Refer to following page for detail.
(BS unit & Indoor unit operation mode
detail)
Indoor unit
expansion valve
EV —
BS 20RT 20RT (Y1S)
BS 20RH (3 way) 20RH (Y3S)