Zone Valve positioning

[prs999]

Hi,

I have just bought a new house, the heating is shot which I knew so we are ripping it out and starting again with a combi and a 2 zone system (upstairs and down)

The existing installation had the boiler upstairs in a cupboard but we want are going to move it downstairs to what will be the utility.

The question I have is where to put the zone valves, there is an option to put them upstairs where the upstairs and downstairs rads currently split or to stick them downstairs into what will be the new pipework from the boiler will run? does it matter in this case? will gravity have any effect? is there a maximum distance from the boiler they have to be?

Also does anyone know if Worcester Bosch Greenstar 34CDI has pump overrun? will the timer/zone valve controller automatically take this into account?

Cheers

 

[SimonG]

Don't worry about it. Just tell your gsr what you want and they will sort it.

 

[Egidio]

Hi there, the position does not realy matter. What you should consider is that you may not need zone valves, deppending on the size of the house. You should have the system split if the house is over 100 sqm. If you do have two zone valves then is good to have an auto by-pass to help cooling down the boiler when overruning, the auto by-pass should be at some distance from the boiler in order to allow the cooling down in that bit of pipework ( some two, three meter would be good).
All the modern boiler have overrun.

 

[happyflyer]

Egidio


You can use another more flexible method of controlling your new system that will give you a zone for every room, fit Terrier battery operated TRV on each rad, they will cost your about £20.00 each, there is also a Terrier programming stick that fits into your laptop, £19.00, it has a very comprehensive and easy way of programming each valve, sit near each valve an the stick will download the times and temps you have set up in the FOC software, it's half duplex so it only programs one way, the software is breeze to use, if you have 8 rads it will cost you 8 x 20 £160.00 and you can tell you friendly Building Control Officer you have 8 zones in the house not the crappy 2 that the regulations suggest, you will still need a valve on the DHWS, BTW there are multiple time zones for each rad.

Best of luck, save the planet and save energy the easy way, no silly wiring plan systems, it's the future

http://www.saveonheatingbills.co.uk/helpSupport/downloads.html

download HZ USB Stick software zip file and try it, use the help menu



And you will need one of these, ABV with a flow meter included , no more guessing how much water is going around the bypass, available from BES part number 18865 made by Honeywell DU 146 £48.00 all your problems solved in one foul swoop

 

[prs999]

Thanks for all of your help, does the auto bypass have to be in the relms of a radiator or could I just tap a loop of 22mm pipe off before all of the zone valves and the return to allow for cool down? we will be installing a combi ans if I could loop some pipe through the back of a built in cupboard the mrs might give me less jip for removing the airing cupboard!

 

[prs999]

I would imagine the loop would be about of 5m long if I went for this option

cheers

 

[happyflyer]

Always look at the manufactures instructions, its all on tinternet, click google below
what the hell did we ever do before tinternet, I can't remember



Google

As close to the outlet side of the pump and then back into the return as close to the boiler as possible, rough guide, like the drawings show

 

[prs999]

Thanks, I have tried to find out the info on the net with no definitive answer in regards to the specific boiler so I have emailed Worcester Bosch, I will post the reply here if I get one

 

[Egidio]

The installation of terrier valves in every radiator is a good idea specially in the bedrooms, but that will not provide boiler interlock. In that case radiators will be shut but boiler will carry on working for as long as the programmer is on through the by pass. The by pass should be installed before the motorised valves because that will open when motorised valves close for boiler overrun in order to cool down.

 

[happyflyer]

The installation of terrier valves in every radiator is a good idea specially in the bedrooms, but that will not provide boiler interlock. In that case radiators will be shut but boiler will carry on working for as long as the programmer is on through the by pass. The by pass should be installed before the motorised valves because that will open when motorised valves close for boiler overrun in order to cool down.

Sorry you know much more than me about the HVAC industry and hydraulics can't help you anymore, hell 10 post and a full blow plumber, what a Forum, why did I waste 55 years of my life

Bye