Indoor Unit - Mitsubishi Electric HP120TNU-A Service Handbook

[8-11 Control Circuit ]
2) TNU
Noise filter board
Noise filter
TB1
AC Power source
TNU: 208-230 VAC
Fuse
Power-supply terminal
block
Surge protector
Filter board
Noise filter
Control board
Solenoid valve
Four-way valve
Relay/LEV
drive circuit
72C
LEV
USB circuit
TB7
Terminal block for
transmission line
CN40
for centralized control
(24-30 VDC)
TB3
Indoor/outdoor
transmission block
(24-30 VDC)
M-NET
transmission line
(Non-polar 2 wire)
TB2
Terminal block for
power source
TB15
Terminal block
for MA remote
TB5
controller
To next unit

(Indoor unit)

Terminal block
for transmission
line connection
17-30 VDC
A, B
17-30 VDC
A, B
9-12 VDC
* MA remote controllers and ME remote controllers cannot be used together.
(Both the ME and MA remote controller can be connected to a system with a system controller.)
58
- chapter 8
Inverter board
Rectifier DCL
Fuse
Power-supply
detection circuit
Power-supply board
Inverter-
Fuse
reset circuit
Rectifier
Microcomputer
Circulating fan
control circuit
3.3 V
Regulator
power supply
DC-DC
5 V
converter
power supply
Transmission
power-supply
detection circuit
Indoor unit
ME remote
controller
MA remote
controller
AC power source (TNU: 208-230 VAC)
Control system (5-30 VDC)
Capacitor board
72C Smoothing capacitor Inverter
Inverter
drive circuit
5 V power supply Microcomputer
FAN board
18 V power supply
Fuse
DC-DC
converter
17 V power supply
30 V power supply
DC-DC
converter
5 V power supply
24 V power supply
DC-DC
FAN board
converter
12 V power supply
Fuse
9 V power supply
Relay drive circuit
5 V power supply
Circulating fan
Compressor
Inverter Heat exchanger fan
Inverter
drive circuit
Microcomputer
Inverter Heat exchanger fan
Inverter
drive circuit
Microcomputer
HWE18220_GB