7-2. Protective Functions

7-2. Protective Functions

 Freeze prevention Freeze prevention

During COOL or DRY operation, freezing is detected and operation is stopped when the temperature of the indoor heat exchanger matches the conditions below.

1.Freeze-prevention operation is engaged when the temperature of the indoor heat exchanger is below 43°F(6°C).

2.Restart after freeze-prevention operation occurs when the temperature of the indoor heat exchanger reaches 46°F(8°C) or above.

Indoor heat exchanger

temperature °F (°C)

46

 

 

C

(8)

 

 

 

43

A

B

 

(6)

 

 

 

36

 

 

 

(2)

 

 

 

*

 

 

 

 

 

a

b

c

d

a.Area: Automatic capacity control

b.When the temperature drops below Point A, the operation frequency is reduced by a certain proportion.

c.Area: Frequency increase is prohibited.

d.When the temperature reaches Point C or above, freezing prevention is ended and control is the same as in the a area.

*When the temperature drops to below 36°F(2°C) (continuously for 2 minutes or longer), the compressor stops.

Once the freeze condition is detected, the air conditioner will work less than the maximum frequency until it is turned off.

NOTE (CLxx models only)

The Freeze Prevention Control during the Low Ambient Cooling Mode (outside air temperature:59°F(15°C) or lower) is as follows. The compressor stops when the temperature of indoor heat exchanger becomes less than 36°F(2°C).

The compressor restarts when the temperature of indoor heat exchanger becomes 46°F(8°C) or higher.

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Panasonic CS-MKS9NKU, CS-MKS24NKU, CS-MKS18NKU service manual Protective Functions, Freeze prevention, NOTE CLxx models only

CS-MKS18NKU, CS-MKS9NKU, CS-MKS24NKU specifications

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