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Mitsubishi Electric PURY-P72 Service Handbook page 317

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Table of Contents
[ IX Troubleshooting ]
[THMU-A]
-8- Control Circuit (THMU-A)
(1) Control power source function block
1) PURY-P72THMU-A
Noise filter
Noise filter
TB1
AC 208 / 230 V
Terminal block for
Fuse
power source
Surge protection
Control board
72C
Solenoid valve
4-way valve
CH11
Relay, LEV
Drive circuit
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)
M-NET
transmission line
(Non-polar 2 wire)
TB2
AC Power source
AC 208 / 230 V
Terminal block for
power source
TB15
Terminal block
for MA remote
TB5
To next unit
controller
(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.)
HWE0803A
INV board
Rectifier
72C
DCL
17V Power supply
5 V Power supply
Fuse
Inverter reset
circuit
63H1
Microcomputer
18 V Power supply
5 V Power supply
DC / DC converter
M-NET board
Detection circuit for
the power supply to
the transmission line
Relay drive circuit
CN40
Indoor unit
M-NET remote
controller
MA remote
controller
Power source system (AC 208 / 230 V)
Control system (DC 5 ~ 30 V)
Compressor
Smoothing capacitor
Inverter
Inverter drive
circuit
Microcomputer
Fan board
Smoothing capacitor
Inverter
Fuse
Inverter drive
circuit
5 V Power supply
Microcomputer
Fuse
DC / DC
converter
30 V Power supply
Relay
- 308 -
Heat
exchanger
fan
GB
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