Daikin REYQ8-48PY1B, Service Manual

Page: 141 / 477

SiBE37-701_B Special Control
Function 130
3.6 Standby
3.6.1 Restart Standby
Used to forcedly stop the compressor for a period of 3 minutes, in order to prevent the frequent ON/OFF of the
compressor and equalize the pressure within the refrigerant system.
3.6.2 Crankcase Heater Control
In order to prevent the refrigerant from melting in the compressor oil in the stopped mode, this mode is used to control
the crankcase heater.
Actuator Symbol
Elect.
symbol
Operation
REYQ REMQ
REYQ8~16P REMQ8P REMQ10•12P REMQ14•16P
Compressor 1 — M1C M1C OFF OFF OFF OFF
Compressor 2 — M2C M2C OFF — OFF OFF
Compressor 3 — M3C M3C — — — OFF
Outdoor unit fan 1 — M1F M1F
Ta>30
°
C: STEP 4
Ta
≤
30
°
C: OFF
Ta>30
°
C: STEP 4
Ta
≤
30
°
C: OFF
Ta>30
°
C: STEP 4
Ta
≤
30
°
C: OFF
Ta>30
°
C: STEP 4
Ta
≤
30
°
C: OFF
Outdoor unit fan 2 — M2F M2F
Ta>30
°
C: STEP 4
Ta
≤
30
°
C: OFF
— —
Ta>30
°
C: STEP 4
Ta
≤
30
°
C: OFF
Electronic expansion valve
(Main)
EVM
Y1E
Y3E
Y1E 0 pls
Electronic expansion valve
(Subcooling)
EVT
Y2E
Y5E
Y3E 0 pls
Electronic expansion valve
(Refrigerant charge)
EVJ Y4E Y2E 80 pls
Four way valve (Heat
exchanger switch)
20SA
Y2S
Y9S
Y3S Holds
Four way valve (Dual
pressure gas pipe switch)
20SB Y8S Y2S Holds
Solenoid valve (Main bypass) SVE
Y5S
Y10S
Y6S OFF
Solenoid valve (Hot gas) SVP Y4S Y5S OFF
Solenoid valve (Refrigerant
regulator liquid pipe)
SVL Y3S Y4S OFF
Solenoid valve (Refrigerant
regulator gas vent pipe)
SVG Y1S Y1S OFF
Solenoid valve (Refrigerant
regulator discharge pipe)
SVO Y7S Y7S OFF
Solenoid valve (Refrigerant
regulator discharge pipe)
SVT Y6S Y8S OFF
Ending conditions — 2 min.
Crankcase heater
OFF
Discharge pipe
temperature < 70°C
Discharge pipe
temperature > 75°C
Crankcase heater
ON