Daikin RXYQ96PYDN Service Manual page 69

Special Control
Cooling indoor unit actuator
Fan
Motorized valve
7.3.2 Heating Oil Return Operation
[Start conditions]
Referring to the following conditions, start heating oil return operation.
• Integral oil rise rate is reached to specified level.
OR • When cumulative compressor operating time exceeds 8 hours (2 hours when the power supply turns ON for the
first time)
Furthermore, the integral oil rise rate is calculated by Tc, Te, and compressor loads.
The higher the compressor operating step No., the cumulative refrigerant oil consumption increases.
When high pressure reaches the high level (i.e., Pc > 27k), the system will switch to defrost operation (refer to Section 7.4
for detail).
Actuator
Compressor 1
Compressor 2
Outdoor unit fan 1
Outdoor unit fan 2
Electronic expansion
valve (main)
Electronic expansion
valve (subcooling)
Electronic expansion
valve (refilling refrigerant)
-way
Four valve (for heat
exchanger selection)
-way
Four valve (for high-
and low-pressure gas
pipe selection)
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)
54
Thermo ON unit
Unit not in operation
Thermo OFF unit
Thermo ON unit
Unit not in operation
Thermo OFF unit
Elect. symbol
Symbol
RXYQ
144PTJU
M1C
—
M2C
M1F
—
M2F
Y1E
EVM
Y3E
Y2E
EVT
Y5E
EVJ Y4E
Y2S
20SA
Y9S
20SB Y8S
Y5S
SVE
Y10S
SVP Y4S
SVL Y3S
SVG Y1S
SVO Y7S
SVT Y6S
Normal opening degree for forced thermostat ON
For any model
other than that
shown on the left
Maintain load that was applied before oil return operation.
M1C
When current circulation rate < circulation rate required
for oil return operation, turn ON the STD compressor
M2C
every 10 seconds (up to 3 units at maximum).
When outdoor unit heat exchanger is condenser, the
M1F
fan will run under cooling fan control.
When outdoor unit heat exchanger is evaporator, the
—
fan will run at the fan step 7 or 8.
20SA=ON : PI control
Y1E
20SA=OFF : 418pls
Y3E PI control
Y2E 80pls
When outdoor unit heat exchanger is condenser, the
valve will turn OFF.
Y3S
When outdoor unit heat exchanger is evaporator, the
valve will turn ON.
Y2S OFF
Y6S OFF
Y5S 0pls
Y4S 0pls
Y1S 0pls
Y7S 0pls
Y8S 0pls
SiUS34-801A_b
Oil return operation
Remote controller setting
OFF
Remote controller setting
Normal opening degree
192pls
Oil return operation
VRVIII R-410A Heat Pump 60Hz