Standby; Restart Standby; Crankcase Heater Control - Daikin VRV - WII Service Manual

SiUS30-604

3. Standby

3.1

Restart Standby

Forced standby is performed to prevent frequent repetition of ON/OFF of the compressor, and to
equalize pressure in the refrigerant system.
Parts name
Compressor
Inverter cooling fan
4 way valve (Main)
4 way valve (for heat exchanger)
Main heat exchanger electronic exp.
valve
Sub-cooling electronic exp. valve
Hot gas bypass solenoid valve
Water heat exch. oil return solenoid valve
Receiver gas charging solenoid valve
Receiver gas discharge solenoid valve
Non-operation unit liquid pipe stop
solenoid valve
Indoor cooling unit fan
Indoor cooling unit expansion valve
Indoor heating unit fan
Indoor heating unit expansion valve
BS 20RH (3 way)
BS 20RT
Ending condition
3.2

Crankcase Heater Control

In order to prevent the refrigerant from dwelling in the compressor in the stopped mode, this mode
is used to control the crankcase heater.
Function
Symbol
—
—
20S1
20S2
EV1
EV3
SVP
SVE
SVL
SVG
SVSL
—
EV
—
EV
20RH
20RT
Discharge pipe temp.<158°F
Crankcase heater
OFF
Discharge pipe temp.>167°F
Electrical
symbol
(M1C)
(M1, 2F)
(Y5S)
(Y7S)
(Y1E)
(Y3E)
(Y1S)
(Y2S)
(Y3S)
(Y4S)
(Y6S)
(M1, 2F)
(Y1E)
(M1, 2F)
(Y1E)
(Y3S)
(Y1S)
Crankcase heater
ON
Actuator function
0 Hz
OFF
Holding
Holding
0 pulse
0 pulse
OFF
OFF
OFF
OFF
ON
Remote controller setting
All indoor EV 0 pulse
Indoor unit control
All indoor EV 0 pulse
Holding
OFF
4 minutes

Standby

61