Daikin RXYQ72 Serivce Manual page 53

Special Control
3.2.2 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)
Oil equalization valve (SVO)
Receiver gas charging valve (SVL)
Receiver gas discharging valve (SVG) OFF
Non-operating unit gas discharging
valve (SVSG)
Non-operating unit liquid pipe stop
valve (SVSL)
Ending conditions
Fan
Electronic expansion valve
<In condition of oil return operation>
Compressor cumulative operation time > 8 hours
(However, 2 hours after turning power on first time.)
42
Oil return preparation
operation
Upper limit control
STEP8
or
STEP9
ON
SH control
0 pls
OFF
ON
OFF
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
OFF
0 pls
0 pls
ON
ON
OFF
OFF
OFF
ON
• 6 min.
or
• Ts - Te<9
Heating oil return operation
SiUS39-601
Post-oil-return operation
1-step increase from
(74 Hz + OFF) to
(Pc - Pe>58 psi) time
STEP9
ON
180 pls
0 pls
ON
ON
OFF
OFF
OFF
ON
• 160 sec.
or
• Pc - Pe>58 psi
OFF
OFF
OFF
512 pls
512 pls
512 pls
Function