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8-8. Overload Prevention (Heating)
8-8-1. Indoor Unit
● This function prevents overheating of the indoor heat exchange coil.
● When the temperature of the indoor heat exchange coil rises above 131°F (55°C), and if the indoor fan is
L (low speed), then the fan speed changes from L (low speed) to M (medium speed).
8-8-2. Outdoor Unit
● Unless the temperature of Thermistor 1 drops to 144°F (62 °C) or less from the point A within 1 minute,
The burner is set to M (point C.)
● Reset is activated when the temperature of Thermistor 1 drops to 122°F (50°C) or less, with the burner
being set to H.
● High-load protection for the outdoor unit is operated independently from the high-load protection for the
indoor unit.
Compressor
Indoor fan
Indoor heat
exch.coil
temp.
H→H, M→M, L→M
131°F
(55°C)
113°F
(45°C)
H or M or L
ON
Thermistor 1
149°F
(65°C)
144°F
(62°C)
122°F
(50°C)
Combustion
Compressor
H
M
L
C
A
B
H
1 minute
Stop