Mitsubishi MXZ-2A20NA, Service Manual

Page: 52 / 102

SERVICE FUNCTIONS 10
ACTUATOR CONTROL
52
9
Relation between main sensor and actuator
MXZ-2A20NA MXZ-2A20NA - MXZ-3A30NA MXZ-3A30NA - MXZ-4A36NA
1 1
Discharge temperature thermistor
Indoor coil thermistor
Defrost thermistor
Gas pipe temperature thermistor
(MXZ-2A20NA, MXZ-3A30NA)
Fin temperature thermistor
Ambient temperature thermistor
Outdoor heat exchanger temperature
Capacity code
Purpose
Protection
Defrosting Protection
Defrosting
Control
Protection
Control
Protection
Control
Compressor LEV
Outdoor
fan motor 4-way
valve
Sensor
Actuator
10-1. Pre-heat control <MXZ-2A20NA - , MXZ-3A30NA - , MXZ-4A36NA >
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 -
, MXZ-4A36NA).
3
Turn ON the power supply for the air conditioner.
NOTE: Pre-heat control will be turned OFF when the breaker is turned OFF.
1
1
1 1
ON
SW2
1 2 3 4 5 6
ON
SW2
1 2 3 4 5 6
MXZ-3A30NA -
MXZ-4A36NA
SW2
SW1
SW871
ON
SW1
1 2 3 4
MXZ-2A20NA -
ON
1 2 3 4
SW1
1
1
OB444C--2.qxp 07.10.18 2:32 PM Page 52