Daikin RQYQ140-180PY1 Service Manual page 64

Detailed Control Functions
• RQCEQ280 ~ 848PY1
"Reverse cycle defrosting (heating oil return)" and "Partial defrosting" are available depending on the combination of the
starting condition for units of this series.
Normal heating operation
"Condition
to start defrosting"
has been met.
"Condition
to start heating oil
return" has been
met.
[Defrost operation start conditions]
•
A lapse of every 2 hours during low-load operation
•
A lapse of every 1 hours during high-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
55
"Condition
YES
to start heating oil
return" has been met
NO
YES
NO
Electric
Partial defrosting operation
Symbol
124Hz → 232 Hz
M1C
Defrost unit: OFF
M1F
Heating unit: Fan control
Defrost unit: 480 pls
Y1E
Heating unit: 4 pls → Low pressure control
Y2E SH control
By "Adjusting control of the refrigerant
Y3E
By "Adjusting control of the refrigerant
Y1S
By "Adjusting control of the refrigerant
Y2S
By "Adjusting control of the refrigerant
Y3S
Y4S
Y5S
Defrost unit: OFF
Y6S
Heating unit: ON
Defrost unit: ON
Y7S
Heating unit: OFF
Y8S
Y9S
Thermostat ON unit: OFF
M1F
Others: No instruction
Y1E
• Pc > 2.94 MPa
• OR • Tb > 11˚C
• 12 min. passed
&
• 6 min. passed
• OR
•
NO
Partial defrosting operation
within 30
minutes.
YES
Reverse cycle defrosting
[Heating oil return operation start conditions]
•
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
amount"
amount"
amount"
amount"
ON
OFF
OFF
OFF
0 pls
• TsA-Te > 5˚C
&
• 30 sec. passed
End
End
(heating oil return)
Reverse cycle defrosting (heating oil return)
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
SiBE341001
Function