new underfloor heating installed now cant have house rads off?
we had a potterton suprima open vented system, with a three port valve, underfloor heating was added in december, its straight off the boiler primary pipework, the return is the last tee into the boiler and the flow is the first off, its a polyplumb zru single circuit with a zone valve and operated by a room thermostat, we cant turn the house rads off by stat or programmer when the underfloor heating is on, only by turning each individual rad off, a seperate contractor said it may be a wiring fault, the original installer said he may have to change our house heating system to two two port valves with a bypass, i think non return valves may do it, im confused can any one tell me why im having this problem? i would be gratefull for any advice. does peccavi know why?
tony March 2010 |