Oil Return Operation - Daikin Super Multi Plus D-Series Service Manual

Special Control
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.
Outdoor unit actuator
Compressor
Outdoor unit fan
Four way valve
Main electronic expansion valve
(EV1)
Subcooling electronic expansion
valve (EV2)
Hot gas bypass valve (SVP)
Receiver gas discharging valve
(SVG)
Ending conditions
Indoor unit fan
BP unit electronic expansion
valve
62
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.
Oil return preparation
operation
Upper limit control
Fan control
OFF
2000 pls
SH control
OFF
OFF
20 sec.
Indoor actuator
Thermostat ON unit
Stopping unit
Thermostat OFF unit
Thermostat ON unit
Stopping unit
Thermostat OFF unit

Oil return operation

124 Hz
Fan control
OFF
2000 pls
0 pls
ON
OFF
• 6 min.
or
• Ts - Te<5
Cooling oil return operation
Set Air Volume
Set Air Volume
SiEBE18-526
Post-oil-return operation
124 Hz
Fan control
OFF
2000 pls
0 pls
ON
OFF
3 min.
OFF
SH control
56 pls
SH control
Function