Mitsubishi Electric CITY MULTI PUHY-400YMF-B Service Handbook page 14

MAIN board
CNTR
CN20
Power supply
3 L1
1 N
CNVCC4
Power source for
CNFC1
control
SW4 SW3
CNS2
M-NET
transmis-
sion
(Centralized
control)
CNS1
M-NET
transmission
SW2 SWU2 SWU1
–11–
CN40
M-NET transmission
power supply
CNVCC3
Power source for control
1-2 30 V, 1-3 30 V
4-6 12 V, 5-6 5 V
CN51
Indication distance
3-4 Compressor
ON/OFF
3-5 Trouble
CNRS3
Serial transmission to
INV board
CN3D
Cooling/Heating auto
changeover
LD1
Service LED
SW1