Справочник Пользователя для Mitsubishi Electronics U1

19

If moisture gets into the refrigerant cycle, or when refrigerant is liquefi ed and col-

lected in the compressor, it may interfere the start-up of the compressor.

To improve start-up condition, the compressor is energized even while it is not 

operating. 

This is to generate heat at the winding.

The compressor uses about 50 W when pre-heat control is turned ON.

Pre-heat control is ON at initial setting.

1. Turn OFF the power supply for the air conditioner before making the setting.

2. Set the 2nd Dip Switch of SW1 on the outdoor electronic control P.C. board to 

ON to activate pre-heat control function.

1. Pre-heat control is turned ON for 15 or 30 min.  after the breaker is turned ON.

2. 30 min. after the unit is stopped, pre-heat control is turned ON for 15 or 30 min.  and turned OFF for 30 min.  

  This is repeated as shown in the graph until the breaker is turned OFF.

 When outside temperature is 68 °F (20 °C) or below , pre-heat control is ON for 30 min.

  When outside temperature is 70 °F (21 °C) or above, pre-heat control is ON for 15 min.

: 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.

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

Outside temperature

30min.

30min.

30min.

30min.

30min.

30min. 15min. 30min. 15min. 30min.

Pre-heat

ON

OFF

Breaker ON

68 °F (20 °C)

Stop
operation

Start
operation

When outside
temperature is
above 68 °F 
(20 °C)

1. Turn OFF the power supply for the air conditioner before making the setting.

2. Set the 4th Dip Switch of SW1 on the outdoor electronic control P.C. board to 

ON to change the defrost finish temperature. (Refer to 10-6-1.)

OFF

(Initial setting)

49.5 °F (9.7 °C)

ON

64.9 °F (18.3 °C)