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SM830078
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.
Fig. 9
COMPRESSOR
OUTDOOR FAN
INDOOR FAN
OFF
OFF OFF
OFF
INDOOR COIL
TEMPERATURE
MORE THAN 10 MINUTES
FREEZE
PREVENTION
6 MINUTES 10 MINUTES
FREEZE
PREVENTION
6 MINUTES
(THERMO ON)
30°F
ON
ON
ON
ON
ON
ON
1029_X_S
SET SPEED
(THERMO OFF)
(3) Drain Pump Control
Drain pump operates when compressor starts to operate or when Float Switch turns off.
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
SET SPEED
OFF
OFF
OFF
OFF
OFF
OFF
FLOAT SWITCH
ON: low water level
OFF: high water level
COMPRESSOR
DRAIN PUMP
OUTDOOR FAN
INDOOR FAN
20 MINUTES
0609_X_S
Fig. 10