Si39 - Daikin R410As Service Manual

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)
∗Value in ( ) are for RXYQ5M only.
Subcooling motorized valve (EV2)
Hot gas bypass valve (SVP)
Oil equalization valve (SVO)
Receiver gas charging valve (SVL)
Receiver gas discharging valve
(SVG)
Non-operating unit gas discharging
valve (SVSG)
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
<In condition of oil return operation>
Compressor cumulative operation time > 8 hours
(However, 2 hours after turning power on first time.)
76
Oil return preparation
operation
Upper limit control
STEP8
or
STEP9
ON
SH control
0 pls
OFF
ON
OFF
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
OFF
0 pls (1400pls)
0 pls
ON
ON
OFF
OFF
OFF
ON
• 6 min.
or
• Ts - Te<5
Heating oil return operation

Si39-302

Post-oil-return operation
1-step increase from
(74 Hz + OFF + OFF) to
(Pc - Pe>0.4 MPa) time
STEP9
ON
180 pls
0 pls
ON
ON
OFF
OFF
OFF
ON
• 160 sec.
or
• Pc - Pe>0.4MPa
OFF
OFF
OFF
512 pls
512 pls
512 pls
Function