Si18-525B Special Control
Function 115
3.2 Oil Return Operation
Oil flown from the compressor to the side of system is collected by oil-returning operation, in
case of that oil in the compressor runs down.
3.2.1 Oil Return Operation in Cooling Operation
[Conditions to start]
The cooling oil-returning operation is started referring following conditions.
Integrated amount of displaced oil
Timer
(After the power is turned on, integrated operating-time is 2 hours and subsequently every 8
hours.)
In addition, integrated amount of displaced oil is derived from Tc, Te, and the compressor
load.
Outdoor unit actuator
Oil return preparation
operation
Oil return operation Post-oil-return operation
Compressor Upper limit control 124 Hz 124 Hz
Outdoor unit fan Fan control Fan control Fan control
Four way valve OFF OFF OFF
Main electronic expansion valve
(EV1)
2000 pls 2000 pls 2000 pls
Subcooling electronic expansion
valve (EV2)
SH control 0 pls 0 pls
Hot gas bypass valve (SVP) OFF ON ON
Receiver gas discharging valve
(SVG)
OFF OFF OFF
Ending conditions 20 sec.
• 6 min.
• Ts - Te<5
3 min.
or
Indoor actuator Cooling oil return operation
Indoor unit fan
Thermostat ON unit Set Air Volume
Stopping unit OFF
Thermostat OFF unit Set Air Volume
BP unit electronic expansion
valve
Thermostat ON unit SH control
Stopping unit 56 pls
Thermostat OFF unit SH control
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