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2
2. Processes and functions
SM830035
2-5 Freeze Prevention (Cooling)
Freeze Prevention keeps the indoor heat exchange coil from freezing. Freezing reduces
the efficiency of the unit, and frost buildup on the coil blocks cool air circulation from the
indoor unit's fan.
Fig. 8
Note: Freeze prevention is controlled by the temperature at the indoor heat
exchanger coil as sensed by either sensor E1 (located at the entrance
of the coil) or sensor E2 (located on the middle of the coil). Freeze
prevention cycle is controlled by the lower temperature sensed at either
of the two sensors.
Chart Explanations and notes
❑ This chart shows when the electronic refrigerant control valve opens to regulate the
temperature of the indoor unit coil to prevent freezing.
❑ If the refrigerant control is not effective and the temperature continues to drop and stays
below 0°C for 2 minutes continuously, the control circuit stops the compressor. The
compressor does not start again until the temperature rises above 3°C.
The compressor stops for 3 minutes minimum.
(°C)
INDOOR UNIT
TEMP.
ELECTRONIC REF.
CONTROL
VALVE SIGNAL
MIN. VALUE OF
EITHER E1 OR E2
3
2
1
0
COMPRESSOR
CONTINUOUS
DETECTION
FOR 2 MINUTES
MINIMUM 3
MINUTES
OPEN
ON ON
0435_M_S
OPEN
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