Freeze Prevention (Cooling); Overload Prevention (Heating) - Sanyo CH0951 Technical & Service Manual

8-4. Freeze Prevention (Cooling)

This function prevents freezing of the indoor heat exchange coil.
When the compressor has been running for 10 minutes or more and the temperature of the indoor heat
exchange coil falls below 30°F, the control circuit stops the compressor for at least 6 minutes. The compressor
does not start again until the temperature rises above 46°F or 6 minutes has elapsed.
T + 4 ¡F
Set temp. T ¡F
Indoor heat exch.
coil temp.
30 ¡F
More than
10 minutes
Compressor
Indoor fan

8-5. Overload Prevention (Heating)

This function prevents overheating of the indoor heat exchange coil.
When the temperature of the indoor heat exchange coil rises above 139°F, 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 141°F, the outdoor fan stops.
141
139
Indoor heat
exch. coil
126
temp. ¡F
120
Outdoor fan
Indoor fan
Compressor
Room temp.
6 minutes
ON OFF ON
Set speed
ON
H or M or L
50
Thermo. OFF
More than
6 minutes
More than
10 minutes
ON OFF
Set speed
OFF
H H, M M, L M
ON
Thermo. ON
ON
ON