Actuator Control; Service Functions - Mitsubishi Electric Mr. Slim MXZ-2A20NA Service Manual

10

ACTUATOR CONTROL

MXZ-2A20NA MXZ-2A20NA -
MXZ-3A30NA MXZ-3A30NA -
Relation between main sensor and actuator
Sensor
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

SERVICE FUNCTIONS

11
11-1. 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]
Turn OFF the power supply for the air conditioner before making the setting.
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
Turn ON the power supply for the air conditioner.
NOTE: Pre-heat control will be turned OFF when the breaker is turned OFF.
MXZ-2A20NA -
1
MXZ-4A36NA
1
Purpose
Protection
Defrosting Protection
Defrosting
Control
Protection
Control
Protection
Control
, MXZ-2A20NA -
1
, MXZ-2A20NA - ).
1 2
, MXZ-4A36NA).
1
MXZ-2A20NA -
1
MXZ-2A20NA -
2
2
Compressor LEV
, MXZ-3A30NA -
2
SW2
ON
1 2 3 4 5 6
SW2
ON
1 2 3 4 5 6
80
Actuator
Outdoor 4-way
fan motor valve
, MXZ-4A36NA >
1
SW2
SW1
SW871
MXZ-3A30NA -
MXZ-4A36NA
1