Daikin VRV II RXYQ8MY1K Service Manual page 73

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)
Receiver gas discharging valve
(SVG)
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".)
Fan
Electronic expansion valve
62
Oil return preparation
operation
Upper limit control
STEP7
or
STEP8
ON
SH control
0 pls
OFF
OFF
ON
130 sec.
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
2000 pls
0 pls
ON
OFF
ON
• 6 min.
or
• Ts - Te<5°C
Heating oil return operation
Si39-502A
Post-oil-return operation
1-step increase from
(74 Hz + OFF + OFF) to
(Pc - Pe>0.4 MPa) time
STEP8
ON
180 pls
0 pls
ON
OFF
ON
• 160 sec.
or
• Pc - Pe>0.4MPa
OFF
OFF
OFF
512 pls
512 pls
512 pls
Function