14.2.2Cooling Overload Control

šPipe temperature limitation / restriction.

o Detects the outdoor pipe temperature and carry out restriction / limitation below (Limit the compressor operation frequency)

o The compressor stops if outdoor pipe temperature exceeds 141.8°F.

o If the compressor stops 4 times in 20 minutes, Timer LED blinks (“F95” indicated: Outdoor high pressure rise protection)

14.2.3Freeze Prevention Control 1

šWhen indoor heat exchanger temperature is lower than 32°F continuously for 6 minutes, compressor will stops operation.

šCompressor will resume its operation 3 minutes after the indoor heat exchanger is higher than 41°F.

šAt the same time, indoor fan speed will be higher than during its normal operation.

šIf the indoor heat exchanger temperature is higher than 55.4°F for 5 minutes, the fan speed will return to its normal operation.

14.2.4Freeze Prevention Control 2

šControl start conditions

o During Cooling operation and soft dry operation

ƒDuring thermo OFF condition, indoor intake temperature is less than 50°F or

ƒCompressor stops for freeze prevention control

oEither one of the conditions above occurs 5 times in 60 minutes.

šControl contents

oOperation stops

oTimer LED blinks and “H99” indicated

14.2.5Dew Prevention Control 1

šTo prevent dew formation at indoor unit discharge area.

šThis control will be activated if:

o Outdoor air temperature and Indoor pipe temperature judgment by microcontroller is fulfilled. o When Cooling or Dry mode is operated more than 20 minutes or more.

šThis control stopped if:

o Compressor stopped.

o Remote control setting changed (fan speed / temperature).

o Outdoor air temperature and indoor intake temperature changed.

šFan speed, angle of louver (vertical airflow angle) will be adjusted accordingly in this control.

1.Fan speed will be increased slowly when control is activated until predetermine value.

šCompressor frequency will be regulated accordingly.

14.2.6Protection Control For Heating Operation

14.2.6.1Intake Air Temperature Control

Compressor will operate at limited freq., if indoor intake air temperature is 95°C or above.

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Panasonic CS-E12NKUAW, CU-E12NKUA, CU-E9NKUA Cooling Overload Control, Freeze Prevention Control, Dew Prevention Control

CS-E9NKUAW, CU-E9NKUA, CU-E12NKUA, CS-E12NKUAW specifications

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