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2. PROCESSES AND FUNCTIONS
2-2 Freeze Prevention
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.
MORE THAN 10 MINUTES
INDOOR COIL
TEMPERATURE
–1°C
COMPRESSOR
OUTDOOR FAN
INDOOR FAN
2-3 Drain Pump Control
Drain pump operates when compressor starts to operate or when Float Switch turns off.
FLOAT SWITCH
ON: low water level
OFF: high water level
COMPRESSOR
DRAIN PUMP
OUTDOOR FAN
INDOOR FAN
FREEZE
PREVENTION
6 MINUTES
ON
OFF
ON
OFF
ON
ON
ON
OFF
OFF
ON
ON
OFF
ON
–
10 MINUTES
(THERMO OFF)
ON
ON
SET SPEED
OFF
20 MINUTES
OFF
ON
OFF
SET SPEED
29
–
FREEZE
PREVENTION
6 MINUTES
(THERMO ON)
OFF
ON
ON
OFF
0608_X_S
Fig. 7
ON
ON
ON
0609_X_S
Fig. 8
2
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