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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.
-0.4°F
-4°F
Compressor OFF
Compressor ON
utdoor Air Temperature
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.
OFF
Frequency Reduced
Frequency Limited
Free
140.0°F
114.8°F
125.6°F
120.2°F
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.
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