93
15. PCB Photo
Hydronic box main control board
PCB code: 0151800770
Terminal block
Color
Function
CN4
Red
Indoor and outdoor comunication
CN6/CN7
White
Wired controller
CN5
White
PCB power
CN3
Yellow
Modbus
CN2
Black
I/O board communication
CN22
Red
Electric expansion valve
CN23
White
Relay board
CN36
White
Flow meter
CN29
Red
Water inlet/outlet sensor
CN25
White
Redrigerant inlet/outlet temp. sensor
CN9
Red
To water pump communication PCB CN9-1
CN30
Red
Low pressure switch short circuit
CN27
Blue
Flow switch short circuit
CN39
Red
Heat2, to heater
CN40
White
Heat1, to heater
CN21
Green
Error output
CN38
/
Room thermostat 1
CN13
/
Room thermostat 2
CN15
/
Freeze heater & Tank heater
CN17
/
Mixing valve
CN16
/
3-way valve
CN14
/
SV1 & Floor valve
CN24
White
Power input 220V~