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2-10. PRE-HEAT CONTROL
MUZ-FD MUZ-FE MUZ-GE
1. Outline
Compressor is energized to improve the start-up of compressor at a low outside temperature even when compressor is
stopped.
2. Pre-heat control
Compressor
Pre-heat control
Outside temperature
Pre-heat control ON condition
(1) Compressor is not operating. (However, pre-heat control is still OFF for 30 minutes after compressor is stopped, regardless
of the outside temperature.)
(2) Outside temperature is 68°F (20°C) or below. Outside temperature is monitored hourly, and when outside temperature is
68°F (20°C) or below, pre-heat control is turned ON. When pre-heat control is turned ON, compressor is energized about
50 W (40-60 W). (Compressor and fan are not operated.)
MUZ-D MUY-D
1. Outline
The compressor is energized even while it is not operating.
This is to generate heat at the winding to improve the compressor's start-up condition.
Power
ON
OFF
Compressor
ON
OFF
Defrost thermistor
69.8°F
(21°C)
Pre-heat
ON
OFF
2. Pre-heat control ON condition
(1) Pre-heat control is turned ON for 15 or 30 minutes after the breaker is turned ON.
(2) 30 min. after the unit is stopped, pre-heat control is turned ON for 15 or 30 minutes and turned OFF for 30 minutes. This
is repeated as shown in the graph until the breaker is turned OFF.
When the defrost thermistor reads less than 69.8°F (20°C), pre-heat control is ON for 30 minutes. When the defrost
thermistor reads 69.8°F (21°C) or more, pre-heat control is ON for 15 minutes.
NOTE: When the unit is started with the remote controller, pre-heat control is turned OFF. Compressor uses 50 W when pre-
heat control is turned ON.
ON
OFF
ON
OFF
68°F
(20°C)
30 minutes
Start
Breaker ON
operation
30 minutes 1 hour
30 minutes
30 minutes 30 minutes 30 minutes
Stop
operation
20
15
15
30 minutes
minutes
30minutes
minutes
30minutes
When the defrost
thermistor reads
or more
69.8°F(21°C)
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