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If i've got a pressure operated bypass valve fitted to return CH water back to boiler, can i stick TRV's on all my radiators, or is it still better to have one radiator that is always open for flow.
Its usual to have one rad without TRV in the room or area where your comfort thermostat is.
However if your system doesnt have a thermostat, but does have a by pass then there's no reason not to fit TRVs to all the rads, but Id question what are you using to turn the boiler off when you have sufficient heat? Just the tank stat?
here we go, relevant page from my plumbing book (clicky makey biggy):
[url= https://lh3.googleusercontent.com/-AbC56oG4aWo/T-Q4AGZevbI/AAAAAAAACxg/ot1UAuTyOxs/s640/plumbing.jp g" target="_blank">
i've got a thermostat and timer fitted, but problem is the thermostat is located in the hall which gets quite warm but a couple of the bedrooms down the corridor from the hall stay colder (its a bungalow)
I was thinking of fitting programmable valves to the radiators (already done this to some of them and they work really well) so that in the winter i can leave the thermostat on a higher setting overnight and control the hall and bedroom radiators with the programmable valves (ie let the hall one turn to a lower temp which means heating will stay on, and the bedroom valves will have a slightly higher temp so these rooms stay warm. Then when they are used less during the day the bedrooms will turn to a lower temp, and hall will turn to a higher temp). So basically mainly controlling heat in each room independantly.
really you still want a thermostat to turn the boiler off at some point.
WHy not replace the thermostat with soemthign like the CM927 and move the console to a place that better reflects the last place to be heated in the house?
http://www.honeywelluk.com/products/Systems/Wireless/CM927/
i've been looking at replaceing the existing thermostat / programmer, but its a wireless thermostat with HW and CH timer. The on off times for CH can be programmed, but cant program set temps. I'd like to replace this, but i cant find a system that has wireless programmable thermostat for CH AND includes HW timeswitch as well.
I know i could install a single channel timeswitch for HW and then use the product you mentioned above, but i'm short of space to mount the controllers where the existing wiring is.
The system i've currently got is a honeywell wireless sundial pack 2, which operates on the same frequency as the CM927 you mentioned, but i dont know if the programmable thermostat in the CM927 can be bound to my existing sundial system instead of the thermostat (wireless) that came with it. In the blurb they both transmit on same frequencies so might be possible. I emailed honeywell about it but the short reply i got didnt really answer this.
Im sure honeywell system is modular enough to handle what you want.
Id probably try them again and see if you get a better response from someone else in their tech support team.