Mitsubishi Electric PAC-MK53BC Technical & Service Manual page 21

7-2. TEST POINT DIAGRAM
Branch box controller board
PAC-MK53BC PAC-MK33BC
PAC-MK53BCB PAC-MK33BCB
CN3M
Connected to the terminal
block (TB5)
(M-NET transmission con-
necting wire)
24–30 V DC (non polar)
LED1,LED2
·Startup
Main power supply
(220/230/240 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 3 seconds
3Repeat 1–2
SW4
Mode selection
SW12
Address setting tens DIGIT
SW11
Address setting ones DIGIT
SW5
Service setting
SW1
Indoor unit connection
OCH664
TH-A to E
Connect to thermistor-A to E
TH-D and E for PAC-MK53BC(B) only
TB3A to E
Connect to indoor unit
1 – 3 : Power supply
2 – 4 220/230/240 V AC 4 – 6 0–24 V DC
LEV-A to E
Connect to LEV-A to E
LEV-D and E for PAC-MK53BC(B) only
TB3D and TB3E for PAC-MK53BC(B) only
3 – 5 : Transmission
21
F1
Fuse 6.3 A 250 V
CND
Power supply for
Branch box
Controller board
1 – 3 220/230/240 V AC
F2,F3,F4
Fuse 10 A 250 V
F4 for PAC-MK53BC(B)
only