Panasonic CS-ME7NKE Technical & Service Manual

Also see for CS-ME12NKE: Operating instructions Technical & service manual Operating instructions

Contents

Panasonic CS-ME7NKE Technical & Service Manual Manual pdf 29 page image

29Overload prevention during heatingDuring HEAT operation, the temperature of the indoor heatexchanger is used to control the frequency and lessen the loadon the compressor before the protective device is activated.Cold-air prevention during heatingDuring heating, the fan speed is set to "LL" (very low) or stopped.As the temperature of the indoor heat exchanger rises, the fanspeed is changed to the set speed.Freeze preventionDuring COOL or DRY operation, freezing is detected andoperation is stopped when the temperature of the indoor heatexchanger matches the conditions below.1. Freeze-prevention operation is engaged when thetemperature of the indoor heat exchanger is below 6 °C.2. Restart after freeze-prevention operation occurs when thetemperature of the indoor heat exchanger reaches 8 °C orabove.a. Area: Automatic capacity controlb. When Point A has been exceeded, the operation frequency isreduced by a certain proportion.c. Area: Frequency increase is prohibited.d. At Point B and below, overload prevention is ended andcontrol is the same as in the a area.a. Area: Automatic capacity controlb. When the temperature drops below Point A, the operationfrequency is reduced by a certain proportion.c. Area: Frequency increase is prohibited.d. When the temperature reaches Point C or above, freezingprevention is ended and control is the same as in the a area.* When the temperature drops to below 2 °C (continuously for 2minutes or longer), the compressor stops.Once the freeze condition is detected, the air conditioner willwork less than the maximum frequency until it is turned off.Approx.53 At stability of operationAt start of operationA HighLLStoppedA*BCBIndoor heat exchangerA. Control startB. Control endSet fan speed25 30 Approx. 40a b c da b c dIndoor heat exchangertemperature (°C)Indoor heat exchangertemperature (°C)Indoor heat exchangertemperature (°C)Approx.47268• The fan speed is forcibly changed to "LL" beginning 30 secondsafter the thermostat turns OFF.• At stability of operation refers to operation when the roomtemperature has approached the set temperature.• When HEAT operation starts, the indoor fan is stopped until thetemperature of the indoor heat exchanger reaches 20 °C orhigher, or until the room temperature reaches 15 °C or higher.NOTE7-2. Protective Functions