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Daikin VRV III-S RXYMQ36 48PVJU Service Manual: Oil Return Operation

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SiUS34-907
3.2

Oil Return Operation

In order to prevent the compressor from running out of oil, the oil return operation is conducted to recover oil
flown out from the compressor to the system side.
3.2.1 Oil Return Operation in Cooling Operation
[Start conditions]
Referring to the set conditions for the following items, start the oil-return operation in cooling.
• Cumulative oil feed rate
• Timer setting (Make this setting to start the oil-return operation when the initial cumulative operating time
reaches two hours after power supply is turned ON and then every eight hours.)
The cumulative oil feed rate is computed from Tc, Te, and compressor loads.
Outdoor unit actuator
Compressor
Outdoor unit fan
Four-way valve (Y1S)
Main electronic expansion valve (EV1) 480 pls
Subcooling electronic expansion valve
(EV3)
Hot gas bypass valve (SVP)
Ending conditions
Fan
Electronic expansion valve
Function
Oil return preparation
operation
Take the current step as the
upper limit.
Fan control (Normal cooling) Fan control (Normal cooling) Fan control (Normal cooling)
OFF
SH control
OFF
20 sec.
Indoor unit actuator
Thermostat ON unit
Stopping unit
Thermostat OFF unit
Thermostat ON unit
Stopping unit
Thermostat OFF unit
Oil return operation
52 Hz Full load
(→ Low pressure constant
control)
OFF
480 pls
0 pls
OFF
• 3 min.
or
• Ts - Te<41°F
Cooling oil return operation
Remote controller setting
Remote controller setting
Normal opening with forced thermostat ON
Special Control
Post-oil-return operation
Same as the
"
oil return
"
operation
mode.
OFF
480 pls
0 pls
OFF
• 3 min.
• Pe<87 psi
or
• HTdi>230°F
OFF
Normal opening
224 pls
37

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  • cp shukla Feb 16, 2016 06:50:
    RXYQ18PAY6 service manual & vrv Fulform