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During cooling operation, the signals being sent from the indoor unit allow the operating frequency limitation

and then prevent freezing of the indoor heat exchanger. (The signal from the indoor unit must be divided into

the zones as the followings).

• Conditions for Start Controlling

 Judge the controlling start with the indoor heat exchanger temperature after 2 seconds from operation start.

7-2-6. Freeze-up Protection Control

During heating operation, the signals being sent from the indoor unit allow the operating frequency limitation

and prevent abnormal high pressure. (The signal from the indoor unit must be divided as follows).

• Conditions for Start Controlling

 Judge the controlling start with the indoor heat exchanger temperature after 2 seconds from operation start

• Control in Each Zone

 The heat exchanger intermediate temperature of indoor unit controls the following.

• Limitation of current drooping and stop value according to the outdoor air temperature

7-2-7. Heating Peak-Cut Control

(1) In case the operation mode is cooling

 • The current droops when outdoor air temperature becomes higher than a certain level (model by model).

(2) In case the operation mode is heating

 • The current droops when outdoor air temperature becomes higher than a certain level (model by model).

Return/Reset zone

Up zone

Keep zone

Drooping zone

Stop zone

Heat exchanger

thermistor temperature

Reset zone