Special Control SiE39-404
86 Function
3.2 Oil Return Operation
3.2.1 Oil Return Operation in Cooling 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”.)
* Actuators are based on RXYQ16M.
Outdoor unit actuator
Oil return preparation
operation
Oil return operation Post-oil-return operation
Compressor Upper limit control 124 Hz + ON + OFF 52 Hz + OFF + OFF
Outdoor unit fan Fan control Fan control Fan control
Four way valve OFF OFF OFF
Main motorized valve (EV1) 1400 pls 1400 pls 1400 pls
Subcooling motorized valve (EV2) SH control 0 pls 0 pls
Hot gas bypass valve (SVP) OFF ON ON
Oil equalization valve (SVO) ON ON ON
Receiver gas discharging valve
(SVG)
OFF OFF OFF
Non-operating unit liquid pipe stop
valve (SVSL)
ON ON ON
Ending conditions 2 min.
• 6 min.
• Ts - Te<5
10 sec.
or
Indoor unit actuator Cooling oil return operation
Fan
Thermostat ON unit Set Air Volume
Stopping unit OFF
Thermostat OFF unit OFF
Electronic expansion valve
Thermostat ON unit Normal opening
Stopping unit 200 pls
Thermostat OFF unit 200 pls
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