Pump-Down Residual Operation - Daikin RXYQ96PYDN Service Manual

Special Control
Evaporating outdoor unit actuator
Compressor 1
Compressor 2
Outdoor unit fan 1
Four-way valve (for heat exchanger
selection)
Four-way valve (for high- and low-
pressure gas pipe selection)
Electronic expansion valve (main)
Electronic expansion valve
(subcooling)
Electronic expansion valve
(refilling refrigerant)
Solenoid valve (main bypass)
Solenoid valve (hot gas)
Solenoid valve (liquid pipe of
refrigerant regulator)
Solenoid valve (gas discharge
pipe of refrigerant regulator)
Solenoid valve (drain pipe of
refrigerant regulator)
Solenoid valve (discharge pipe of
refrigerant regulator)
Heating indoor unit actuator
Thermo ON unit
Fan Unit not in operation
Thermo OFF unit
Thermo ON unit
Motorized valve Unit not in operation
Thermo OFF unit
7.5

Pump-down Residual Operation

7.5.1 Pump-down Residual Operation in Cooling Operation
If the liquid refrigerant stays in the Evaporator at the startup of a compressor, this liquid refrigerant enters the compressor,
thus resulting in diluted oil in the compressor and then degraded lubrication performance.
Consequently, in order to recover the refrigerant in the Evaporator while the compressor stops, the pump-down residual
operation is conducted.
Actuator
Compressor 1
Compressor 2
58
Elect. symbol
Symbol
RXYQ
144PTJU
M1C
—
M2C
M1F
—
M2F
Y2S
20SA
Y9S
20SB Y8S
Y1E
EVM
Y3E
Y2E
EVT
Y5E
EVJ Y4E
Y5S
SVE
Y10S
SVP Y4S
SVL Y3S
SVG Y1S
SVO Y7S
SVT Y6S
RXYQ72 · 96 · 120P
OFF
OFF
OFF
416pls
160pls
160pls
Elect. symbol
Symbol
RXYQ
144PTJU
M1C
—
M2C
For any model
Defrost operation
other than that
shown on the left
M1C
210Hz+ON
M2C
M1F
Fan control
—
Y3S ON
Y2S Holds
Y1E PI control
Y3E SH control
Y2E 80pls
Y6S OFF
Y5S OFF
Y4S 0pls
Y1S 0pls
Y7S 0pls
Y8S 0pls
Defrost operation
RXYQ144PTJU
(230V)
LL
OFF
LL
160pls
0pls
160pls
For any model
Master unit operation
other than that
shown on the left
M1C
124 Hz+OFF
M2C
SiUS34-801A_b
Operation after defrost
210Hz+ON
Fan control
ON
Holds
PI control
0pls
80pls
OFF
OFF
0pls
0pls
0pls
0pls
RXYQ144PYDN (460V)
RXYQ168 · 192 · 216 · 240P
LL
OFF
LL
224pls
0pls
224pls
Slave unit operation
OFF
VRVIII R-410A Heat Pump 60Hz