Mitsubishi Electric MXZ-4C36NAHZ Service Manual page 115

Branch box controller board
PAC-MKA50BC
PAC-MKA30BC
CN3M
Connected to the terminal
block (TB5)
(M-NET transmission con-
necting wire)
24–30 V DC (non polar)
LED1,LED2
·Start-up
Main power supply
(208/230 V AC)
·Normal operating
LED1:Main power supply
LED2:Blink depend on the
total number of indoor
units.
<Example>
The total number is 2,
1Blink 2 times
2Turn OFF for 2 seconds
3Repeat 1–2
SW4
Mode selection
SW12
Address setting 10ths DIGIT
SW11
Address setting 1s DIGIT
SW5
Service setting
SW1
Indoor unit connection
OCH573
TH-A to E Connect to
Thermistor-A to E
TH-D and E for PAC-MKA50BC only
TB3A to E
Connect to indoor unit
1 – 3 : Power supply
2 – 4 208/230 V AC
LEV-A to E
Connect to LEV-A to E
LEV-D and E for PAC-MKA50BC only
TB3D and TB3E for PAC-MKA50BC only
3 – 5 : Transmission
4 – 6 0–24 V DC
115
F1
Fuse 6.3 A 250 V
CND
Power supply
for Branch box
Controller board
1 – 3208/230 V AC
F2,F3,F4
Fuse 10 A 250 V
F4 for PAC-MKA50BC
only