Dry Operation (Dehumidification); Freeze Prevention - Sanyo C0951 Technical & Service Manual

8-2. Dry Operation (Dehumidification)

Dry operation uses the ability of the cooling cycle to remove moisture from the air, but by running at low
level to dehumidify without greatly reducing the room temperature. The air conditioner repeats the cycle of
turning ON and OFF automatically as shown in the chart below according to the room temperature.
Room temp.
T + 4 F
* Dry A Zone
Set temp. T F
T – 2 F
* Dry B Zone
Room temp.
59 F
Both the indoor and outdoor units stop.
NOTE
Intermittent ventilation occurs by switching the indoor fan speed between L
Dry operation does not occur when the room temperature is under 59°F, which is the Monitor Zone.
When the compressor stops, the indoor fan stops as well.

8-3. Freeze Prevention

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 34°F, the control circuit stops the compressor for at least 6 minutes. The com-
pressor does not start again until the temperature rises above 46°F or 6 minutes have elapsed.
T+4 F
Set temp.
T F
Indoor heat exch.
coil temp.
34 F*
Compressor
Indoor fan
*KS1852: 36 F
Cooling operation
Compressor: Continuous operation
FMI (indoor fan): L (low speed)/LL (very low speed) intermittent ventilation only while the compressor is ON.
Compressor: Intermittent operation (ON for 3 minutes and OFF for 9 minutes)
FMI (indoor fan): L (low speed)/LL (very low speed) intermittent ventilation only while the compressor is ON.
Monitor Zone
Room temp.
6 minutes
More than
10 minutes
ON OFF
Set speed
More than
10 minutes
ON ON
Set speed
42
LL.
Thermo OFF
Thermo ON
More than
6 minutes
OFF ON