221
Send oil return signal oil return begins oil return over
60s ref. eliminated 30s
Oil return frequency auto frequency
Low frequency
Inverter compressor auto frequency
350pulse(E)
running indoor PMV auto angle auto angle
120pulse(E)
80(E)
stopped indoor PMV OFF angle 5(E) OFF angle 5(E)
Outdoor motor AUTO AUTO (TC or ambient temp. control) AUTO
running indoor motor AUTO AUTO (set fan speed) AUTO
stopped indoor motor STOP STOP STOP
4-way valve OFF OFF OFF
Multi:
D: Entering condition
When the compressor running frequency is lower than 58Hz (E) continuously for 4 hrs, the system will enter oil
return operation. In the course of mode changeover, manual unit stop or protective unit stop, the time will be
accumulative. After the compressor restarts up, the time will be counted continuously. In a continuous 4 hrs, if the
compressor running frequency is not less than 72Hz for over 10 minutes continuously, the accumulative time will be
cleared. Also after the heating defrosting, the time will be cleared.
E: Procedure
Cooling mode: refer to “the oil return procedure in cooling mode”
Heating mode: refer to “the oil return procedure in heating mode”
F: The protection treatment in oil return operation
In the course of oil return, because of protection or abnormal unit stop, after the unit restarts up, the time will not be
cleared, the system will need another oil return operation. In the refrigerant ow course in the oil return of cooling
mode or after the oil return, and within 5 minutes after the refrigerant being eliminated is over, the anti-freezed
protection is invalid, and also the low voltage protection is invalid. But the other protection is valid.
In the course of oil return from heating mode to cooling mode, if abnormal condition occurs or the unit stops for
protection, then the system needs not another oil return within 3 minutes after the unit stops and it will start up
directly, then to heating mode.
In the course of oil return from heating mode to cooling mode, the anti-freezed protection is null and void, and the
low voltage protection is null either. The other protection is valid.
Oil return procedure in cooling mode:
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