Daikin VRV III RXYQ5-54PY1 Service Manual page 123

Special Control
3.3.2 Oil Return Operation in Heating Operation
Outdoor Unit Actuator
Compressor
Outdoor unit fan
Four way valve
Main motorized valve (EV1)
Subcooling motorized valve (EV2)
Hot gas bypass valve (SVP)
Accumulator oil return valve (SVO)
Injection (SVT) (RXYQ5P model only)
Ending conditions
* 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".)
* Actuators are based on RXYQ14
Fan
Electronic expansion valve
112
Oil return preparation
operation
Upper limit control
STEP7
or
STEP8
ON
SH control → 480 pls
SH control
OFF
ON
OFF
170 sec.
~
18P.
Indoor unit actuator
Thermostat ON unit
Stopping unit
Thermostat OFF unit
Thermostat ON unit
Stopping unit
Thermostat OFF unit
Oil return operation
176 Hz + ON + ON
OFF
OFF
480 pls
0 pls
OFF
ON
OFF
• 4 min.
or
• Ts - Te<5°C
Heating oil return operation
Oil return EV opening degree
Oil return EV opening degree
Si34-601A
Post-oil-return operation
124 Hz + OFF + OFF
2-steps increase/20sec.
till Pc - Pe>0.4 MPa
STEP8
ON
55 pls
0 pls
OFF
ON
OFF
• 10 sec.
or
• Pc - Pe>0.4MPa
OFF
OFF
OFF
256 pls
Function