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99
FlexFit Pro
6.2.4 Oil return control
Control purpose: Oil return control ensures oil regularly returns to the compressor has been operating at long
periods of time at a low speed.
Condition:
The oil return mode will be entered when the compressor has been operating for at least 5 hours at a speed lower
than parameters C HZ (E) and the temperature TC is lower than 122 degrees F. The 5 hour timing will pause if the
unit is changing modes or stopped by an error code. Timing will resume when the compressor restarts. Timing will
automatically reset when the compressor is operating at a speed higher than B HZ (E) for more than 10 minutes.
Timing will reset following a defrost period during the heating mode..
After oil return, the timer is reset.
Conditions following the oil return cycle
OR
OR
Oil return after 1 minutes
The longest 3 minutes
Td-TC>30°C
Ts-TM>30°C
TM<-35°C
Process control chart of oil return:
Send oil return signal Start End
60S Refrigerant ruled working
Oil return frequency B Hz（E） Auto
40HZ （ E ）
Inverter compressor Auto frequency
300 pulses（E）
PMV Auto opening Auto
120pulses（E）
OD fan Auto working Auto working Auto working
ID fan
Auto working Auto working Auto working
4-way valve OFF OFF OFF
SV valve (auto running according to some condition)
30s
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