Indoor Unit - Mitsubishi Electric PUHY-HP144TSHMU-A Service Handbook

[ IX Troubleshooting ]
-7- Control Circuit
(1) Control power source function block
Noise filter
TB1
AC 208 / 230 V
Fuse
Terminal block for
power source
Surge protection
Control board
72C
Solenoid valve
4-way valve
CH11
LEV
12V Power supply
TB7
Terminal block for
transmission line
for centralized control
(DC 24 ~ 30 V)
TB3
Indoor/outdoor
transmission block
(DC 24 ~ 30 V)
TB2
AC Power source
AC 208 / 230 V
Terminal block for
power source
TB15
Terminal block
for MA remote
TB5
controller
To next unit

(Indoor unit)

Terminal block
for transmission
line connection
DC 17 ~ 30 V
A, B
DC 17 ~ 30 V
A, B
DC 9 ~ 12 V
* MA remote controllers and M-NET remote controllers cannot be used together.
(Both the M-NET and MA remote controller can be connected to a system with a system controller.)
HWE0716A
Noise filter Rectifier 72C
Fuse
Inverter reset
circuit
Microcomputer 18 V Power supply
Relay, LEV
Drive circuit
5 V Power supply
DC / DC converter
M-NET board
Detection circuit for
the power supply to
the transmission line
CN40
Indoor unit
M-NET remote
controller
MA remote
controller
Smoothing capacitor
DCL
INV board
15V Power supply
Fuse
DC / DC
converter
12 V Power supply
Fan board
Fuse
63H1
5 V Power supply
Fuse
Relay drive circuit
DC / DC
converter
30 V Power supply
Relay
- 204 -
Power source system (AC 208 / 230 V)
Control system (DC 5 ~ 30 V)
Compressor
Inverter
Inverter drive
circuit
Microcomputer
5 V Power supply
Heat
Inverter exchanger
fan
Inverter drive
circuit
Microcomputer
GB