The majority of modern central heating systems make use of motorised valves, often called Zone valves, to divide different heating systems and hot water generation ie. Radiators, Under Floor Heating and Hot water cylinder.. the H-Box wiring centre is used to switch on a shunt pump which will send primary water from a buffer tank or the.. Operation - Hot water only. Power starts at terminal 3 (HW On) in the programmer. This passes via the wiring centre terminal 6 to the cylinder thermostat. If heat is required, power continues to terminal 8 in the wiring centre, and on to the boiler and pump. The valve is not powered at all, and the spring holds it in position B, so water from.

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JG Underfloor Controls 240v wiring centre with RF is an all-in-one junction box for underfloor heating systems. Essential for centralising underfloor heating wiring, the wiring centre features 8 zone connections and is easily mounted and wired with a fully labelled circuit board. All connections are hard wired for zone valves (for additional.. Operation - Heating. Power starts at terminal 4 (CH On) in the programmer. This passes via the wiring centre terminal 4 to the room thermostat. If heat is required, power continues to terminal 5 in the wiring centre, and operates the motor in the central heating valve.