Panasonic CS-ME10DTEG Service Manual

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Panasonic CS-ME10DTEG Service Manual Manual pdf 87 page image

8.5. Outdoor Unit Operation8.5.1. Room Temperature Control8.5.1.1. Cooling, Soft Dry and Heating Operations1. Immediately after the compressor has started up during an ongoing operation, the initial frequency is determined on the basisof the information obtained from the heat exchanger capacities of the indoor units (thermostat ON) and the airflows set by theirremote controls.2. During an ongoing operation, the difference between the temperature set in each of the rooms and the room temperature isdetected, the total load is calculated, and the compressor frequency is determined on the basis of this information.3. When one room turns the thermostat OFF while two or more indoor units are operating, the automatic expansion valve closesto restrict the flow of refrigerant, the compressor control is temporarily suspended, and both the initial frequency and total loadare determined again.4. When the thermostat is turned OFF during 1-room operation, the outdoor unit´s compressor and fan stop. (The outdoor unit’sfan stops 60 seconds after the compressor.)5. It takes about 180 seconds for the compressor to be restarted after it has stopped. (Re-start control)8.5.1.2. Deice Operation Control Outline Heat Pump OnlyDefrosting is carried out by the cooling cycle (reverse cycle). The defrosting time or outdoor heat exchangertemperature must be more than its fixed value when finishing.Detail Conditions for Starting DefrostThe starting conditions must be made with the outdoor air temperature and heat exchanger temperature.Under the conditions that the system is in heating operation, 6 minutes after the compressor is started andmore than 38 minutes of accumulated time pass since the start of the operation or ending the defrosting.Conditions for Canceling DefrostThe target heat exchanger temperature as the canceling condition is selected in the range of 4°Caccording to the air temperature as the following formula.The target heat exchanger temperature=-(45/65)(ambient temperature)+14The defrost operation surely operates in 120 seconds after the start. (A→B)After then the defrost operation stops at the following conditions.1. When the heat exchanger temperature reaches the target heat exchanger temperature. (B→C)2. When 650 seconds have passed after the start even if the heat exchanger temperature does not reachesthe target heat exchanger temperature. (C)87