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4.3 3-WAY VALVE
The boiler uses a 3-way to change the water distribution (heating system side or secondary exchanger
side). It’s managed by the PCB that drive the stepper motor. It is formed by a composite material body
and an electric stepper motor.
With the boiler on stand-by the 3-way valve is positioned on sanitary mode.
The 3 way valve can have 3 different positions:
Heating;
Domestic hot water (DHW);
Stand-by (position similar to DHW, but with the gasket uncompressed).
Every time that the boiler is supplied the 3 way valve motor does a reset procedure, it does 3 complete
switching (DHW Heating DHW), after that the position is related to the boiler working mode.
After DHW request (if there is not heating request), the e way valve remains in DHW position for 10 minutes,
after that it goes in stand-by position.
At the end of the heating request (if there is not DHW request), after the post-circulation, the 3 way valve
goes on DHW position and after 10 minutes it goes in stand-by position.
If the boiler is switched off through the ON/OFF button, the 3 way valve goes immediately in stand-by (if
post-circulation is in progress, the 3 way valve goes in stand-by position at the end of the post-circulation).
The anti-sticking function of the 3 way valve is performed every 21 h after the last request.
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