control of the demand for the heating and hot water, control of the temperature on the hot water when demand is called , control of the temperature on the central heating when the demand is called, i circulate the water, The spring pulls the valve to open the flow through port B, while the motor winds it towards opening port A, filling the heating system by a 15mm copper feed, with no valves connected, Provide a safety outlet, should the system overheat.​, fill the system and allow the heated water in the system to expand.​, must rise a minimum of 450mm above the (heated) water level, two lock shield valves, normally in the same room as the room stat.

8202-25 (y plan)

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