Specifications

Detailed Control Functions SiBE341027
58 Function
(2) Oil Return Operation in Heating
[Start conditions]
Referring to the set conditions for the following items, start the oil return operation in heating.
• 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
* 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”.)
Part Name
Electric Symbol
Oil return operation
RQYQ8P PQYQ10·12P PQYQ14·16P
Compressor
M1C M1C M1C 124Hz
–M2CM2CON
––M3COFF
Outdoor unit fan M1F M1F M1F, M2F OFF → High pressure control
Four way valve Y3S Y3S Y3S OFF
Electronic expansion valve (Main) Y1E Y1E Y1E 480 pls
Electronic expansion valve (Main 2) – – Y2E
Electronic expansion valve
(Subcooling)
Y2E Y2E Y3E 0 pls
Solenoid valve (Hot gas) Y1S Y1S Y1S ON
Solenoid valve (Receiver gas vent) Y8S Y8S Y8S OFF
Solenoid valve (Circuit of oil return) Y5S Y5S Y5S OFF
Solenoid valve (Close liquid pipe for
stopped outdoor unit)
Y6S Y6S Y6S ON
Solenoid valve (Main electronic
expansion valve bypass)
Y10S Y10S – ON
Solenoid valve (Refrigerant
regulator gas vent pipe)
Y11S Y11S Y10S OFF
Solenoid valve (Refrigerant
regulator liquid pipe)
Y12S Y12S Y11S OFF
Solenoid valve (Refrigerant
regulator gas pipe)
Y13S Y13S Y12S OFF
Solenoid valve (Refrigerant
regulator liquid outlet)
Y14S Y14S Y13S OFF
Solenoid valve (Receiver liquid level) Y7S Y7S Y7S OFF
Solenoid valve (Mixing unit inlet) Y4S Y4S Y4S OFF
Solenoid valve (Bypass) Y2S Y2S Y2S OFF
Solenoid valve (Oil regulator outlet) Y9S Y9S Y9S ON
Indoor unit actuator Heating oil return operation
Fan
Thermostat ON unit OFF
Stopping unit OFF
Thermostat OFF unit OFF
Electronic expansion valve
Thermostat ON unit 512 pls
Stopping unit 512 pls
Thermostat OFF unit 512 pls