Oil Return Operation - Daikin VRV II RXYQ5MY1B Service Manual

Special Control
3.2

Oil Return Operation

3.2.1 Oil Return Operation in Cooling Operation
Outdoor unit actuator
Compressor
Outdoor unit fan
Four way valve
Main motorized valve (EV1)
Subcooling motorized valve (EV2)
Hot gas bypass valve (SVP)
Oil equalization valve (SVO)
Receiver gas discharging valve
(SVG)
Non-operating unit liquid pipe stop
valve (SVSL)
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 RXYQ16M.
Fan
Electronic expansion valve
86
Oil return preparation
operation
Upper limit control
Fan control
OFF
1400 pls
SH control
OFF
ON
OFF
ON
2 min.
Indoor unit actuator
Thermostat ON unit
Stopping unit
Thermostat OFF unit
Thermostat ON unit
Stopping unit
Thermostat OFF unit

Oil return operation

124 Hz + ON + OFF
Fan control
OFF
1400 pls
0 pls
ON
ON
OFF
ON
• 6 min.
or
• Ts - Te<5
Cooling oil return operation
Set Air Volume
Normal opening
SiE39-404
Post-oil-return operation
52 Hz + OFF + OFF
Fan control
OFF
1400 pls
0 pls
ON
ON
OFF
ON
10 sec.
OFF
OFF
200 pls
200 pls
Function