Daikin FXSQ32P7VEB [116/370] Oil return operation

Daikin FXSQ40PVE4 [116/370] Oil return operation
Special Control SiBE311209
107 Function
8.2 Oil Return Operation
This function is used to recover refrigerant oil that flows out from the compressor to the system side by conducting oil
return operation in order to prevent the compressor from running out of refrigerant oil.
8.2.1 Cooling Oil Return Operation
[Start conditions]
Referring to the following conditions, start cooling oil return operation.
• Integral oil rise rate (1) is reached to specified level.
• When cumulative compressor operating time exceeds 8 hours (2 hours when the power supply turns ON for
the first time)
1 The integral oil rise rate:
The higher the compressor operating step No., the cumulative refrigerant oil consumption increases.
<Outdoor Units>
1: In case of multi outdoor unit system:
Master unit: It conducts the operation listed in the table above.
Slave units: Operating units conduct the operation listed in the table above.
Non-operating units conduct the operation listed in the table above after the "Oil returning" process.
(Non-operating units stop while in "Preparation" mode.)
Outdoor unit actuator
Electric
symbol
Oil return preparation
operation
Oil return operation Operation after oil return
Compressor 1 M1C
Take the current step as the
upper limit.
52Hz + ON + ON
(Subsequently, constant low
pressure control)
Maintain the number of
compressors that were used
before oil return operation)
52Hz + ON + ON
(Subsequently, constant low
pressure control)
Compressor 2 M2C
Compressor 3 M3C
Outdoor unit fan 1 M1F
Fan control Fan control Fan control
Outdoor unit fan 2 M2F
Electronic expansion
valve (Main)
Y1E 480 pls 480 pls 480 pls
Electronic expansion
valve (Subcooling)
Y3E SH control 0 pls 0 pls
Electronic expansion
valve (Refrigerant
charge)
Y2E 80 pls 80 pls 80 pls
Solenoid valve
(Refrigerant regulator gas
vent pipe)
Y1S OFF OFF OFF
Four way valve (Heat
exchanger switch)
Y3S OFF OFF OFF
Solenoid valve
(Refrigerant regulator
liquid pipe)
Y4S OFF OFF OFF
Solenoid valve (Hot gas) Y5S OFF OFF OFF
Solenoid valve (Main
bypass)
Y6SONONON
Solenoid valve
(Refrigerant regulator
discharge pipe)
Y7S OFF OFF OFF
Solenoid valve
(Refrigerant regulator
discharge pipe)
Y8S OFF OFF OFF
Solenoid valve (Heat
exchanger hot gas)
Y9SONONON
Four way valve (High and
low pressure gas pipe
switch)
Y2SONONON
End conditions 20 sec.
After a lapse of 3 min.
TsA - Te < 5°C
After a lapse of 3 min.
Pe < 0.59MPa
Pc > 3.53MPa
HTdi > 110°C
OR
OR
OR

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