York YHKMXH024BARX-FX - Page 241

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 condion
When the compressor running frequency is lower than 58Hz (E) connuously for 8 hrs, the system
will enter oil return operaon. In the course of mode changeover, manual unit stop or protecve
unit stop, the me will be accumulave. Aer the compressor restarts up, the me will be counted
connuously. In a connuous 8 hrs, if the compressor running frequency is not less than 72Hz for
over 10 minutes connuously, the accumulave me will be cleared. Also aer the heang
defrosng, the me will be cleared.
E: Procedure
Cooling mode: refer to “the oil return procedure in cooling mode”
Heang mode: refer to “the oil return procedure in heang mode”
F: The protecon treatment in oil return operaon
In the course of oil return, because of protecon or abnormal unit stop, aer the unit restarts up,
the me will not be cleared, the system will need another oil return operaon. In the refrigerant
flow course in the oil return of cooling mode or aer the oil return, and within 5 minutes aer the
refrigerant being eliminated is over, the an-freezed protecon is invalid, and also the low voltage
protecon is invalid. But the other protecon is valid.
In the course of oil return from heang mode to cooling mode, if abnormal condion occurs or the
unit stops for protecon, then the system needs not another oil return within 3 minutes aer the
unit stops and it will start up directly, then to heang mode.
In the course of oil return from heang mode to cooling mode, the an-freezed protecon is null
and void, and the low voltage protecon is null either. The other protecon is valid.
Oil return procedure in cooling mode:
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