[/quote]Could i fit an electriclly operated shutoff valve in place of the bypass?
In a word, NO
In a word, NO
In a word, NO
why?
because a proper bypass valve is designed to allow a set amount of water through depending on system load, for example when TRV's shut down, the bypass will open and let a bit of water through the bypass to relieve pressure. Your proprosing to allow all the water through the bypass circuit if the zone valves are closed, and have the bypass completely closed when the zone valves are open - if your doing that you may as well get rid of the bypass as it will serve absolutely no purpose what so ever. If you think about it, if the zone valves are closed then the boiler and pump will not be on, and it wouldnt matter if the valve was open or closed...and so to re-iterate, what your proposing makes no sense at all.
That's a good answer to a silly question.
Instead of messing around with unnecessary relays you could have thrown away the Viessmann timer and bought a boggo external one.
Most of us here would know how to fit relays but would also be intelligent enough not to bother. If I tried such bodges with customer installs they would be horrified.
There are others, one of which is a condenser and has been in continuous production since 1982.......
I believe Poxi Batterton now make a heat only that needs no pump overrun too? Not sure about the model details because we don't install their stuff.
Fitting a `Y` plan is all good and well exept it has already been stated quote:- that i have a 26kW boiler a 3 port is a bit restrictive
Fitting a `Y` plan is all good and well exept it has already been stated quote:- that i have a 26kW boiler a 3 port is a bit restrictive
Honeywell quote up to 26kw for their V4073A/V4044C 22mm divertor valves.
Danfoss are less restrictive afaik.
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