Daikin ERQ - Oil Return Operation

ESIE09-05 Special Control
Function 27
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 so as 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.)
Furthermore, the cumulative oil feed rate is computed from Tc, Te, and compressor loads.
Outdoor unit actuator
Oil return preparation
operation
Oil return operation Post-oil-return operation
Compressor
Take the current step as the
upper limit.
52 Hz Full load
(→ Low pressure constant
control)
Same as the “oil return
operation” mode.
Outdoor unit fan Fan control (Normal cooling) Fan control (Normal cooling) Fan control (Normal cooling)
Four way valve OFF OFF OFF
Main electronic expansion valve
(EV1)
480 pls 480 pls 480 pls
Subcooling electronic expansion
valve (EV3)
SH control 0 pls 0 pls
Hot gas bypass valve (SVP) OFF OFF OFF
Ending conditions 20 sec.
• 3 min.
• Ts - Te<5° C
• 3 min.
• Pe<0.6MPa
• HTdi>110° C
or
AHU actuator Cooling oil return operation
Fan
Thermostat ON unit ON
Stopping unit OFF
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