Mitsumi electronic -2 ユーザーズマニュアル

20

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

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.

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