Freeze Prevention; Overload Prevention - Technibel GR54M2R Technical Data & Service Manual

9-3. Freeze Prevention (Cooling)
This function prevents freezing of the indoor heat exchange coil.
When the compressor has been running for 10 minutes
exchange coil falls below –1°C, the control circuit stops the compressor for at least 6 minutes. The compressor
does not start again until the temperature rises above 8°C or 6 minutes has elapsed.
T+1 °C
Set temp. T ° C
Indoor heat exch.
coil temp.
–1 °C
Compressor
Indoor fan
NOTE
*1) Functionally, compressor running period, or time are of two types, 10 minutes and 6 minutes depending upon
production date.
9-4. Overload Prevention (Heating)
This function prevents overheating of the indoor heat exchange coil.
When the temperature of the indoor heat exchange coil rises above 49°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 50°C, the outdoor fan stops.
Indoor heat
exch. coil
temp. ° C
Outdoor fan
Compressor
Room temp.
6 minutes
More than
10 minutes
ON
Set speed
57
54
47
44
Indoor fan H or M or L
*1)
or more and the temperature of the indoor heat
More than
10 minutes
OFF ON ON
ON
H H H, M H M, L H M
ON
21
Thermo. OFF
More than
6 minutes
OFF
Set speed
OFF ON
Thermo. ON
ON