Daikin RQYQ140-180PY1 Service Manual page 63

SiBE341001
2.7.3 Heating Oil Return Operation and Defrost Operation
• RQYQ140 · 180PY1, RQCYQ280 ~ 560PY1
[Heating Oil Return Operation]
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
[Defrosting Operation]
To defrost the outdoor unit heat exchanger while in heating operation, the defrost operation is conducted to recover the
heating capacity.
[Start conditions]
Referring to the set conditions for the following items, start the defrosting operation.
• A lapse of every 1 hour during high-load operation
• A lapse of every 2 hours during low-load operation
Part Name
Compressor
Outdoor unit fan
Electronic expansion
valve (Main)
Electronic expansion
valve (Refrigerant
charge)
Electronic expansion
valve (Subcooling)
Solenoid valve
(Refrigerant regulator
hot gas)
Solenoid valve
(Refrigerant regulator
liquid pipe)
Solenoid valve
(Refrigerant regulator
gas vent pipe)
Solenoid valve (Hot
gas)
Solenoid valve (Circuit
of oil return)
Four way valve (Heat
exchanger switch)
Four way valve (Dual
pressure gas pipe)
Four way valve (Mixing
unit)
Solenoid valve (Mixing
unit inlet)
Indoor unit fan
Electronic expansion
valve (Main)
Ending condition
Function
Electric
Symbol
M1C
M1F
Y1E
Y2E
Y3E
Y1S
Y2S
Y3S
Y4S
Y5S
Y6S
Y7S
Y8S
Y9S
M1F
Y1E
Heating oil return and defrost operation
188 Hz
OFF
480 pls
SH control
By "Adjusting control of the refrigerant amount"
By "Adjusting control of the refrigerant amount"
By "Adjusting control of the refrigerant amount"
By "Adjusting control of the refrigerant amount"
ON
OFF
OFF
ON
OFF
OFF
OFF
1216 pls → Suction SH control
• Pc > 2.94 MPa
• OR • Tb > 11˚C
• 12 min. passed
&
• 6 min. passed
• OR
• TsA-Te > 5˚C
• &
• 30 sec. passed
Detailed Control Functions
54