Cooling Overload Control; Freeze Prevention Control; Freeze Prevention Control 2; Dew Prevention Control - Panasonic CS-YS9MKV-7 Service Manual

12.10 Cooling Overload Control


Pipe temperature limitation / restriction.
Detects the outdoor pipe temperature and carry out restriction / limitation below (Limit the compressor
o
operation frequency)
The compressor stops if outdoor pipe temperature exceeds 61°C.
o
If the compressor stops 4 times in 20 minutes, Timer LED blinks ("F95" indicated: Outdoor high pressure rise
o
protection)

12.11 Freeze Prevention Control


When indoor heat exchanger temperature is lower than 0°C continuously for 6 minutes, compressor will stops
operation.

Compressor will resume its operation 3 minutes after the indoor heat exchanger is higher than 13°C.

At the same time, indoor fan speed will be higher than during its normal operation.

If the indoor heat exchanger temperature is higher than 13°C for 5 minutes, the fan speed will return to its normal
operation.

12.12 Freeze Prevention Control 2


Control start conditions
During Cooling operation and soft dry operation
o
 During Thermo OFF condition, Indoor intake temperature is less than 10°C or
 Compressor stops for freeze prevention control
Either one of the conditions above occurs 5 times in 60 minutes.
o

Control contents
Operation stops
o
Timer LED blinks and "H99" indicated
o

12.13 Dew Prevention Control


To prevent dew formation at indoor unit discharge area.

This control will be activated if:
Cooling mode or Quiet mode is activated.
o
Remote control setting temperature is less than 25°C.
o
Fan Speed is at CLo or QLo.
o
Room temperature is constant (±1°C) for 30 minutes.
o
Compressor is continuously running.
o

Fan speed will be adjusted accordingly in this control.
Fan speed will be increased slowly if the unit is in quiet mode but no change in normal cooling mode.
o

12.14 Odor Cut Control


To reduce the odor released from the unit.
Start Condition
o
 AUTO FAN Speed is selected during COOL or DRY operation.
 During freeze prevention control and timer preliminary operation, this control is not applicable.
Control content
o
 Depends on compressor conditions:
1. Compressor OFF → Compressor ON.
The indoor unit fan stops temporarily and then starts to blow at minimum airflow for 30 seconds.
2. Compressor ON → Compressor OFF.
The indoor unit fan stops for 90 seconds and then blows at minimum airflow for 20 seconds.
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