Panasonic CS-RE9SKUA Service Manual page 65

15.2.6 Protection Control For Heating Operation
15.2.6.1 Intake Air Temperature Control
Compressor will operate at limited freq., if indoor intake air temperature is 86.0°F or above.
15.2.6.2 Outdoor Air Temperature Control

The Max current value is regulated when the outdoor air temperature rise above 57.2°F in order to avoid
compressor overloading.

The compressor will be stopped at outdoor air temperature ≤ -4°F. The unit still operate within the temperature
range.
15.2.6.3 Overload Protection Control

The compressor operating frequency is regulated in accordance to indoor heat exchanger temperature as shown
below.

If the heat exchanger temperature exceeds 140.0°F, compressor will stop.
15.2.6.4 Low Temperature Compressor Oil Return Control

In heating operation, if the indoor temperature falls below 17.6°F when compressor starts, the compressor
frequency will be regulated up to 600 seconds.
15.2.6.5 Cold Draught Prevention Control

When indoor pipe temperature is low, cold draught operation starts where indoor fan speed will be reduced or
stop.

Horizontal vane angle may be adjusted in Auto vane setting.
15.2.6.6 Deice Operation
When outdoor pipe temperature and outdoor air temperature is low, deice operation start where indoor fan motor and
outdoor fan motor stop and operation LED blinks. Horizontal vane is closed during auto vane setting.
Compressor ON
-0.4°F
Compressor OFF
Outdoor Air Temperature
OFF
140.0°F
Frequency Reduced
125.6°F
Frequency Limited
120.2°F
Free
65
-4°F
114.8°F