Panasonic CS-VU9SKQ - Outdoor Air Temperature Control; Cooling Overload Control; Freeze Prevention Control 1; Freeze Prevention Control 2

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14.9 Outdoor Air Temperature Control
 The compressor operating frequency is regulated in accordance to the outdoor air temperature as shown in the
diagram below.
 This control will begin 1 minute after the compressor starts.
 Compressor frequency will adjust based on outdoor air temperature.
14.10 Cooling Overload Control
 Pipe 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 61°C (VU9SK), 63°C (VU12, 18SK).
o If the compressor stops 4 times in 20 minutes, Timer LED blinks (“F95” indicated: Outdoor high pressure rise
protection).
14.11 Freeze Prevention Control 1
 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 5°C.
 At the same time, indoor fan speed will be higher than during its normal operation.
 If indoor heat exchanger is higher than 5°C for 5 minutes, the fan speed will return to its normal operation.
14.12 Freeze Prevention Control 2
 Control start conditions
o During Cooling operation and soft dry operation.
 During thermo OFF condition, indoor intake temperature is less than 10°C or
 Compressor stops for freeze prevention control
o Either one of the conditions above occurs 5 times in 60 minutes.
 Control contents
o Operation stops.
o Timer LED blinks and “H99” indicated.
14.13 Dew Prevention Control
 To prevent dew formation at indoor unit discharge area.
 This control will be activated if:
o Outdoor air temperature and indoor pipe temperature judgment by microcontroller is fulfilled.
o When COOL or DRY mode is operated more than 20 minutes or more.
 This control stopped if
o Compressor stopped.
o Remote Control setting changed (fan speed / temperature).
o Outdoor air temperature and indoor intake temperature changed.
 Fan speed will be adjusted accordingly in this control.
Free
Limited Frequency
Outdoor air temperature
37°C
38°C