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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.
Power ON
OFF
Compressor ON
OFF
Pre-heat ON
OFF
Breaker ON
69.8°F
(21°C)
Stop
operation
Start
operation
Defrost thermistor
30 minutes 30 minutes 30 minutes 30 minutes 30 minutes 30 minutes
15
minutes
15
minutes
30minutes
30minutes
When the defrost
thermistor reads
69.8°F(21°C) or more
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.
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
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.)
30 minutes 1 hour
ON
ON
OFF
OFF
68°F
(20°C)
Compressor
Pre-heat control
Outside temperature