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11. PROCESSES AND FUNCTIONS
(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
30 F
COMPRESSOR
OUTDOOR FAN
INDOOR FAN
(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
ON
OFF
ON
OFF
ON
SET SPEED
FREEZE
PREVENTION
10 MINUTES
6 MINUTES
(THERMO OFF)
ON
ON
SET SPEED
OFF
20 MINUTES
OFF
ON
OFF
– 48 –
(THERMO ON)
OFF
ON
OFF
ON
1029_X_S
Fig. 9
ON
ON
ON
0609_X_S
Fig. 10
SM830078
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