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by aduncan
Sat May 17, 2008 11:45 pm
Forum: Central Heating and Air conditioning and Ventilation Forum
Topic: Radiors come on with HW only
Replies: 8
Views: 4364

Hi and thanks. The CH valve/actuator must be working surely as as when HW only selected, the CH flow to the radiators immediately beyond the valve is cold. This problem has been evident ever since we moved in to this house so don't know how long its being going on. Pump is correct. No alterations. W...
by aduncan
Tue May 13, 2008 9:04 pm
Forum: Central Heating and Air conditioning and Ventilation Forum
Topic: Radiors come on with HW only
Replies: 8
Views: 4364

In addition - the two valves appear to be working OK.
by aduncan
Tue May 13, 2008 9:03 pm
Forum: Central Heating and Air conditioning and Ventilation Forum
Topic: Radiors come on with HW only
Replies: 8
Views: 4364

OK - here goes. Open system (S plan i think) Boiler is Myson Appollo, Grundfos pump, type UPS 15-50x18. Two x 2-port valves. I have a cellar beneath the rear of the house so everything is readily accessible. With HW only on. Heating return pipe is hot. Manifold with microbore returns from rear house...
by aduncan
Tue May 13, 2008 2:04 pm
Forum: Central Heating and Air conditioning and Ventilation Forum
Topic: Radiors come on with HW only
Replies: 8
Views: 4364

Radiors come on with HW only

Downstairs radiators come on when HW only slected. They heat up from the return side. We have been shutting of TRVs in the summer but keen now to find a fix :?:
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