54
SERVICE FUNCTIONS
10
ACTUATOR CONTROL
9
Relation between main sensor and actuator
MXZ-2B20NA MXZ-3B24NA MXZ-3B30NA MXZ-4B36NA MXZ-5B42NA
Discharge temperature thermistor
Indoor coil thermistor
Defrost thermistor
Fin temperature thermistor
Ambient temperature thermistor
Outdoor heat exchanger temperature
Capacity code
Purpose
Protection
Defrosting Protection
Defrosting
Protection
Control
Protection
Control
Compressor
LEV
Outdoor
fan motor
4-way
valve
Solenoid
valve
(MXZ-5B)
Sensor
Actuator
10-1. PRE-HEAT CONTROL
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 "4" of SW1 on the electronic control P.C. board to ON to deactivate pre-heat control function
(MXZ-2B20NA)
.
Set the "4" of SW2 on the electronic control P.C. board/outdoor control P.C. board to ON to deactivate pre-heat control
function
(MXZ-3B24NA, MXZ-3B30NA, MXZ-4B36NA, MXZ-5B42NA)
.
Turn ON the power supply for the air conditioner.
NOTE
: Pre-heat control will be turned OFF when the breaker is turned OFF.
MXZ-2B20NA
Electronic control
P.C. board
ON
SW2
1 2 3 4 5 6
MXZ-3B24NA
MXZ-3B30NA
MXZ-4B36NA
SW2
SW1
SW871
Electronic control
P.C. board
ON
SW2
1 2 3 4 5 6
MXZ-5B42NA
Outdoor control P.C. board
MXZ-2B20NA MXZ-3B24NA MXZ-3B30NA MXZ-4B36NA MXZ-5B42NA
OBH560G
Содержание MXZ-5B42NA
Страница 15: ...15 WIRING DIAGRAM 6 MXZ 2B20NA MXZ 2B20NA 1 OBH560G ...
Страница 16: ...16 MXZ 3B24NA MXZ 3B30NA MXZ 4B36NA OBH560G ...
Страница 17: ...17 MXZ 3B24NA 1 MXZ 3B30NA 1 MXZ 4B36NA 1 OBH560G ...
Страница 18: ...18 MXZ 5B42NA OBH560G ...