Advice Needed for Heating control system

neilht · 4 Apr 2008

Hello, just moved into my first house,
I have GHW and pumped heating, so when i want only hot water, the radiators get hot too!

I want to modify the system so i can have individual controll of HW and CH.

I was thinking of upgrading to a Honeywell S plan, (in the link below)
http://content.honeywell.com/uk/homes/systems.htm

here is a picture of the proposed position of the motorised valves,
i don't know much about heating/hw systems so if anyone can see a problem whith this please say!!!

I have tried to identify all of the pipes!!
currently there is no room stat and thermo valves on all rads, so i'm going to put a stat downstairs and take thermo valves off downstairs rads, and also put new cylinder stat on

cheers
Neil

spookman · 4 Apr 2008

Don't take your rad stats off as they can still be used to control the temp of all your rooms individually - all you need to do is make sure you have a 'minimum flow rad', by that a rad that is always on to give your bolier something to work on - you can get spring loaded adjustable valves that will do this as well - see plumbers suppliers. the trick is to just play with the rad stat and room stat for a few days, you will soon get the hang of it. When your room stat calls for heat it will only warm up the rooms that need it - not all of them - easy!

twgas · 4 Apr 2008

cut pipe at red x and add air bleed

connect pipe from loft along blue route, (I'm assuming this pipe is cold feed not open vent)

GasMan1965 · 4 Apr 2008

Put an auto bypass valve whete gate valve is in bypass and remove TRV where room stat is gonna go,, also If it were me Id go Y plan in place of tee above pump ..

Less to go wrong in Y plan !!

neilht · 4 Apr 2008

GasMan1965 said:
Put an auto bypass valve whete gate valve is in bypass and remove TRV where room stat is gonna go,, also If it were me Id go Y plan in place of tee above pump ..

Less to go wrong in Y plan !!

yes would be better than having 2 motorised valves!! don't know why i didn't think of that.

TWGAS

yes that is the cold feed, (just had a look upstairs) the pipe furthest on left is the vent above tank, also there is a bleed valve above the pump if this is what you mean (circled in pic)

if i fit a 3 port motorised valve in the tee above the pump would i still need to move the cold feed, why would i have to move it for the S plan?

cheers for everyones input!!
Neil

GasMan1965 · 4 Apr 2008

You may aswell while drained down and would be better

neilht · 5 Apr 2008

ok just read somewhere putting in the cold feed before pump will stop any problems like pumping over etc so the plan now is

-move cold feed to before the pump
-put auto bypass valve in place of gate valve in bypass loop
-fit bleed valve where current cold feed pipe is to be cut
-fit Y plan system

would there be any harm in having 2 bleed valves (2nd one will go where i cut the cold feed pipe)

cheers neil

twgas · 5 Apr 2008

would there be any harm in having 2 bleed valves (2nd one will go where i cut the cold feed pipe)

good idea to put one on each high point

GasMan1965 · 5 Apr 2008

twgas said:
would there be any harm in having 2 bleed valves (2nd one will go where i cut the cold feed pipe)

Click to expand...

good idea to put one on each high point

neilht · 5 Apr 2008

thanks for everyones input!!!

better buy some parts now!!

cheers

neilht · 6 Apr 2008

just realised if I put the 3-port motorised valve at the tee after the pump the bypass loop will be after the motorised valve, so if the valve jams shut, there would be no place for the pumped water to go??

think i'll stick to the original plan with 2 motorised valves.

anyone know what to set the automatic bypass valve to when i plumb that in?

cheers

twgas · 6 Apr 2008

2*2ports as per your original post would be easiest - less pipework

GasMan1965 · 6 Apr 2008

All you have to do bout bypass is re-tee it before 3 port... anyhoo the S plan will work fine

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Advice Needed for Heating control system

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