Freeze Prevention; Freeze Protection - Sanyo STW-2 Series Technical & Service Manual

10-2. Freeze Prevention

This function prevents freezing of the indoor heat exchange coil.
When the temperature of the indoor heat exchange coil falls below 32°F, the compressor stops operation. The
compressor does not start again until the temperature rises above 50°F.
NOTE
(*) Actual compressor OFF time indicated by "3 minutes" varies between 2 minutes 45 seconds to 4 minutes
Indoor heat exch.
coil temp.
50 °F
32 °F
Compressor
Indoor fan

10-3. Freeze Protection

This function prevents the temperature within the room from dropping below freezing.
When the room temperature falls below 46.4°F, the electric heater comes ON to keep the room temperature
above freezing. This function always works at any operational mode even when the unit is OFF.
The following chart shows an example when the mode selector switch is at OFF position.
47.3 °F
Room temp.
46.4 °F
Heater
Indoor fan (*)
NOTE
Indoor heat exch. coil temp.
(*) 3 minutes or more
ON
Room temp.
ON
OFF
High
OFF
(*) Indoor fan operation synchronizes with that of heater's thermo ON and OFF
regardless of fan cycle switch position.
OFF
Set speed
OFF
OFF
59
ON
ON
High
.