Runxin N74A3 - Function and Connection of PC Board

MODEL: N74A1-63510/N74A3-63610/N74B1-63510B/N74B3-63610B
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3.2.The Function and Connection of PC Board
Open the front cover of control valve, you will see the main control
board and connection port as below:
The main functions on main control board:
Function
Application
Explanation
Signal
output
connector
b-01
Outlet solenoid
valve
If system strictly require no hard
water flow from outlet or controlling
the liquid level in water tank.
Inlet pump
Increase pressure for regeneration
or washing.
Use the liquid level controller to
control inlet pump to ensure there is
water in tank.
Signal
output
connector
b-02
Inlet solenoid valve
or inlet pump
When inlet pressure is high, it
needs to close water inlet when
valve is rotating to protect motor.
Pressure
relief
connector
Control the inlet
bypass to release
pressure
When valve is rotating, pressure
relief connector opened to prevent
pressure increasing rapidly.