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5-6. Overload Prevention (Heating)
● Overload prevention prevents overheating of the indoor heat exchange coil. This function works either when
the temperature of indoor heat exchange coil goes up or compressor current rises to a certain level.
■ Temperature of indoor heat exchange coil sensor
● When the temperature of the indoor heat exchange coil rises above A2°C, and if the indoor fan is L (low speed),
then the fan speed changes from L (low speed) to M (medium speed).
● When the temperature of the indoor heat exchange coil rises above A1°C, the outdoor fan stops.
Indoor heat
exch. coil
temp. ° C
Outdoor fan
Indoor fan
Compressor
NOTE
The operation temperature shown as A1, A2, A3 and A4 in the chart differ by models.
A1
A2
A3
A4
■ Compressor current detection
● When the compressor current rises above B1(A), and if the indoor fan is L (low speed), then the fan speed
changes from L (low speed) to M (medium speed). At the same time the outdoor fan stops its operation.
● When the compressor current drops to B2(A), the outdoor fan resumes its operation.
● When the compressor current drops below B3(A), indoor fan returns to operate in set speed.
Compressor
current (A)
Outdoor fan
Indoor fan
Compressor
NOTE
The compressor current shown as B1, B2 and B3 in the chart differ by models.
B1
B2
B3
A1
A2
A3
A4
ON
H ➞ H, M ➞ M, L ➞ M
H or M or L
ON
9000 BTU/h
54°C
52°C
45°C
42°C
B1
B2
B3
ON
H ➞ H, M ➞ M, L ➞ M
H or M or L
ON
9000 BTU/h
6.5 A
4.4 A
4.4 A
OFF
ON
12000 BTU/h
58°C
56°C
50°C
46°C
OFF
ON
12000 BTU/h
9.5 A
6.5 A
6.5 A
18
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