Panasonic U-8ME1E81 Service Manual

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Contents

Panasonic U-8ME1E81 Service Manual Manual pdf 62 page image

2WAY SYSTEMControl Functions - Indoor Unit2 - 827. Discharge Air Temperature ControlDischarge air temperature is controlled using the indoor unit discharge air temperature sensor. The dischargeair temperature is set in the EEPROM on the PCB. The setting is different depending on the model.Discharge air temperature setting (at the time of factory shipment)Indoor unit typeDischarge air temperature settingCooling HeatingY2, F1, F2, M1, E1, K2 12˚C 50˚CCondition for Thermostat ON → OFF under discharge air temperature control① Temperature less than “Discharge air temperature setting – 2˚C” is continuously detected for 20minutes in cooling mode② Temperature more than “Discharge air temperature setting + 2˚C” is continuously detected for 20minutes in heating mode③ Temperature less than “Discharge air temperature setting – 3.5˚C” is continuously detected for 7minutes in cooling mode④ Temperature more than “Discharge air temperature setting + 3.5˚C” is continuously detected for 7minutes in heating modeThere is no priority order between the room temperature control and discharge air temperature control.Relation between thermostat ON/OFF and room temperature control/discharge air temperature controlThermostat turns OFF: Either room temperature control or discharge air temperature control satisfiesthermostat OFF condition.Thermostat turns ON: Both of room temperature control and discharge air temperature control satisfythermostat ON condition.8. RAP Valve Kit ControlThe RAP valve kit is sometimes used in the 2WAY system.The RAP valve kit prevents refrigerant from collecting in the indoor heat exchanger when the indoor unit isstopped. The following table shows the RAP valve kit operation.Operating mode RAP valve kitStopped OFFFan OFFCooling Thermostat ON OFFThermostat OFF OFFHeating Thermostat ON ONThermostat OFF OFF7. Discharge Air Temperature Control8. RAP Valve Kit Control