Panasonic Urban Multi MX1R Series Service Manual

PACD011001C2 FunctionFunction Urban Multi “MX1, ME1 Series” Using R-22 391.12 Pump Down Residual Operation1.12.1 MX1 SeriesIf refrigerant is remaining in the accumulator when the compressor starts, liquid refrigerant is sucked intothe compressor, diluting the refrigerant machine oil and reducing the lubricating performance. To preventthis, the pump-down operation discharges refrigerant from the low pressure side when the unit is not inoperation.Residual operation may be carried out for 10 minutes under the following conditions when heating.1. When outdoor temperature (R1T) is ≥ -5°C and inverter discharge pipe temperature (R3-1T) < 95ºC,and a OFF by thermostat command is received with the compressor’s continuous operation time being10 minutes or less, residual operation is carried out for a maximum of 10 minutes.2. When the thermostat is ON during residual operation, residual operation is not carried out if the total of1+2+3 is 10 minutes or more.3. When outdoor temperature (R1T) < -5°C and a stop command is received from the thermostat sensor,etc., residual operation is carried out for 10 minutes without fail. (Operation may however stop fordischarge pipe or high/low pressure safety.)&Discharge pipe thermistor (R3-1T) on inverter side: 95°C or lowerOROutside air temperature thermistor (R1T) < 0°CWhen compressor continuous operating time is less than 10 minutes and thermostat is OFF, orwhen stop command is received from remote controllerWithin 20 minutes after defrost or oil return operationT0 (oil temperature) ≤ Te+10ThermostatCompressor andoutdoor unit fanMax. 10 min.ONOFFONOFFResidual operation for 10 min.Operation may stop during the 10 minutesresidual operation due to protection discharge,high/low pressure, etc.(VL006)ThermostatMax. 10 min. Max. 10 min.Compressor andoutdoor unit fanResidualoperationResidual operation not carried outif 1 + 2 + 3 is 10 minutes or more.ONOFFONOFF(VL007)ThermostatON1 2 3