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SERVICE FUNCTIONS
9
MUZ-D30NA MUZ-D36NA MUY-D30NA MUY-D36NA
9-1. PRE-HEAT CONTROL
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.
[How to activate pre-heat control]
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.
1234
ON
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.
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.
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)
9-2. CHANGE IN DEFROST SETTING
Changing defrost finish temperature
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.)
4th Dip Switch of SW1 Defrost fi nish temperature
OFF
(Initial setting)
49.5 °F (9.7 °C)
ON 64.9 °F (18.3 °C)
1234
ON