Heat Source Unit Circuit Board - Mitsubishi Electric City Multi PQHY-P72 Service Handbook

[ III Heat Source Unit / BC Controller Components ]

[3] Heat Source Unit Circuit Board

1. Heat source MAIN board
(1) PQHY/PQRY
CNRS3B
Serial communication input from
CN38
and output to inverter board
High-pressure
switch (63H)
CN52C
52C1 driving output
AC 208/230V
1 - 3
CN51
3 - 4
Compressor operation
3 - 5
Outdoor (heat source)
unit operation
error signal output
Output from solenoid
valve for unit control etc.
(208/230V)
CNOUT1
Relay drive output
to relay board
CNAC3
Power output
3 L1 phase
1 L2 phase
CN20
Power input
5 L1 phase
1 Ground
CN21
Power input
3 L2 phase
1 L3 phase
CNS1
For indoor/outdoor (heat source)
transmission line (DC30V)
LD2
Address SW
F1,F2 Fuse
AC 250V/6A
CNS2
For centralized control
system (DC30V)
Control sensor input
- 70 -
CN40(with power supply
to centralized system)
CN41(without power supply to
centralized system)
CNVCC1
Control power supply input
1 - 2 DC 30V
1 - 3 DC 30V
4 - 5 DC 7V
4 - 6 DC 12V
7 - 8 DC 7V
CN63PW
1 - 2 Pump interlock signal input
from relay board
CN3D
1 - 2 NIGHT MODE input
1 - 3 Compressor ON/OFF input
LD1
Service LED
CNLVC
LEV2 Output
CNLVB
LEV1 Output(WY only)
Dip switch
SW1 - SW5