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9
ACTUATOR CONTROL
MXZ-2A20NA MXZ-2A20NA -
Relation between main sensor and actuator
Sensor
Discharge temperature thermistor
Indoor pipe temperature thermistor
Defrost thermistor
Gas pipe temperature thermistor
(MXZ-2A20NA, MXZ-3A30NA)
Fin temperature thermistor
Ambient temperature thermistor
Outdoor heat exchanger temperature
Capacity code
10
SERVICE FUNCTIONS
10-1. Pre-heat control <MXZ-2A20NA -
If moisture gets into the refrigerant cycle, or when refrigerant is liquefied and collected 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 deactivate pre-heat control]
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 deactivate pre-heat control func-
tion (MXZ-2A20NA -
Set the 4th Dip Switch of SW2 on the outdoor electronic control P.C. board to ON to deactivate pre-heat control func-
tion (MXZ-3A30NA -
SW1
ON
1 2 3 4
SW1
ON
1 2 3 4
3 Turn ON the power supply for the air conditioner.
NOTE: Pre-heat control will be turned OFF when the breaker is turned OFF.
MXZ-3A30NA MXZ-3A30NA -
1
Purpose
Protection
Defrosting Protection
Defrosting
Control
Protection
Control
Protection
Control
, MXZ-3A30NA -
1
).
1
).
1
MXZ-2A20NA -
1
Compressor
LEV
>
1
SW2
ON
1 2 3 4 5 6
SW2
ON
1 2 3 4 5 6
38
1
Actuator
Outdoor
4-way
fan motor
valve
SW2
SW1
SW871
MXZ-3A30NA -
1
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