Special Control - Daikin VRV II-Q RQYQ8-48PY1B Service Manual

SiBE341027
2.6

Special Control

2.6.1 Oil Return Operation
In order to prevent the compressor from running out of oil, the oil return operation is conducted to recover oil
flown out from the compressor to the system side.
(1) Oil Return Operation in Cooling
[Start conditions]
Referring to the set conditions for the following items, start the oil return operation in cooling.
• 2 hours after initial power ON
• A lapse of every 1 ~ 2 hours during low-load operation
• A lapse of every 8 hours during high-load operation
Part Name
Compressor
Outdoor unit fan
Four way valve
Electronic expansion valve (Main)
Electronic expansion valve (Main 2)
Electronic expansion valve
(Subcooling)
Solenoid valve (Hot gas)
Solenoid valve (Receiver gas vent)
Solenoid valve (Circuit of oil return)
Solenoid valve (Close liquid pipe for
stopped outdoor unit)
Solenoid valve (Main electronic
expansion valve bypass)
Solenoid valve (Refrigerant
regulator gas vent pipe)
Solenoid valve (Refrigerant
regulator liquid pipe)
Solenoid valve (Refrigerant
regulator gas pipe)
Solenoid valve (Refrigerant
regulator liquid outlet)
Solenoid valve (Receiver liquid level)
Solenoid valve (Mixing unit inlet)
Solenoid valve (Bypass)
Solenoid valve (Oil regulator outlet)
* In the case of multi-outdoor-unit system,
Master unit: Performs the operations listed in the table above.
Slave units: Operating units perform the operations listed in the table above.
Non-operating units perform the operations listed in the table above from the oil return operation.
(Non-operating unit stops during "oil return preparation operation".)
Fan
Electronic expansion valve
Function
RQYQ8P
M1C
–
–
M1F
Y3S
Y1E
–
Y2E
Y1S
Y8S
Y5S
Y6S
Y10S
Y11S
Y12S
Y13S
Y14S
Y7S
Y4S
Y2S
Y9S
Indoor unit actuator
Thermostat ON unit
Stopping unit
Thermostat OFF unit
Thermostat ON unit
Stopping unit
Thermostat OFF unit
Electric Symbol
PQYQ10·12P PQYQ14·16P
M1C M1C
M2C M2C
– M3C
M1F M1F, M2F
Y3S Y3S
Y1E Y1E
– Y2E
Y2E Y3E
Y1S Y1S
Y8S Y8S
Y5S Y5S
Y6S Y6S
Y10S –
Y11S Y10S
Y12S Y11S
Y13S Y12S
Y14S Y13S
Y7S Y7S
Y4S Y4S
Y2S Y2S
Y9S Y9S
Detailed Control Functions
Oil return operation
177Hz
No instruction → OFF
No instruction → OFF
Fan control in normal cooling
(Heat exchanging mode)
OFF
480 pls
0 pls
ON
OFF
OFF
ON
ON
OFF
OFF
OFF
OFF
OFF
OFF
OFF
ON
Cooling oil return operation
Remote controller setting
OFF
OFF
Normal opening
200 pls
200 pls
57