Heat Source Unit Circuit Board - Mitsubishi Electric PQHY-P72ZLMU-A Service Handbook

[ III Heat source Unit Components ]

[3] Heat source Unit Circuit Board

1. Heat source unit control board
CNDC
Bus voltage input
(325 VDC)
P
N
Actuator drive
signal output
(230 VAC)
CN503
52C drive signal
output
CN63PW
Pump interlock
signal input
Pump interlock
signal input
CNOUT
12 VDC output
Operation ON
signal output
F01
250 VAC
3.15A T
CNAC CNAC2
230 VAC input 230 VAC output
L1 phase L1 phase
L2 phase L2 phase
For information about the display of SW4 function settings, refer to section VII [1] Functions and Factory Settings of the Dip-
switches.
HWE15150
CN801
Pressure switch connection
External signal input (contact input)
CN51
CNVCC2
12 VDC output
Compressor ON/OFF signal output
Error signal output
CN61
CN2
17 VDC
Serial communication
17 VDC signal input
GND GND
(Inverter board) 5 VDC
CN62
12 VDC output
Centralized control
5 VDC output
transmission signal input/output (30 VDC)
GND
Power input signal for the centralized
control system (30 VDC)
Indoor-heat source
transmission signal input/output (30 VDC)
- 85 -
CN4
Serial communication
GND
LEV
drive signal output
SWU1,2
Address switch
LED1
Service LED
LED3
Function setting
display
Lit :ON
Unlit:OFF
LED2
Normal/Error
indicator
SWP1
SW4 setting
(SW6-10:OFF)
Effective/Ineffective
switching
SW4~6
Dip switches
Sensor input
CNPS
12 VDC output
GND
5 VDC output
CN40
Power supply
Centralized control
detection input
power supply ON
Power supply
ON/OFF signal
output
CN41
Centralized control
power supply OFF
GB