York YHKMXH009BARX-FX Service Manual

Send oil return signal oil return begins oil return over60s ref. eliminated 30sOil return frequency auto frequencyLow frequencyInverter compressor auto frequency350pulse(E)running indoor PMV auto angle auto angle120pulse(E)80(E)stopped indoor PMV OFF angle 5(E) OFF angle 5(E)Outdoor motor AUTO AUTO (TC or ambient temp. control) AUTOrunning indoor motor AUTO AUTO (set fan speed) AUTOstopped indoor motor STOP STOP STOP4-way valve OFF OFF OFFMULTI:D: Entering conditionWhen the compressor running frequency is lower than 58Hz (E) continuously for 8 hrs, the systemwill enter oil return operation. In the course of mode changeover, manual unit stop or protectiveunit stop, the time will be accumulative. After the compressor restarts up, the time will be countedcontinuously. In a continuous 8 hrs, if the compressor running frequency is not less than 72Hz forover 10 minutes continuously, the accumulative time will be cleared. Also after the heatingdefrosting, the time will be cleared.E: ProcedureCooling 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 operationIn 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 refrigerantflow course in the oil return of cooling mode or after the oil return, and within 5 minutes after therefrigerant being eliminated is over, the anti-freezed protection is invalid, and also the low voltageprotection 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 theunit stops for protection, then the system needs not another oil return within 3 minutes after theunit 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 nulland void, and the low voltage protection is null either. The other protection is valid.Oil return procedure in cooling mode:239