Two thermostats on one circuit?

[coopersim]

This might be a silly question, but is it possible to have two thermostats in diffferent places calling for heat connected to the same heating circuit?

My problem is that my Drayton Digistat 3 is on the landing outside the airing cupboard - this works fine for the 1st floor bedrooms, but on the 2nd floor there is no stat, and it always freezing.

What I want is to wire a Drayton RF stat in to the upstairs CH circuit, and either the 1st or 2nd floor stat to be able to call for heat, is this possible?

Thanks...

 

[ScottishGasMan]

Hi, Yes its possible to do this.

If your Using a hard wired thermostat and a remote digistat youll need to figure out how to wire them together, as they may be different.

Where two stats the same could be bridged in a parrallell circuit so that either will activate the heating.

 

[Sarahspark]

It is not possible to activate diffrent heating zones without 2 port valves, but the 2 stat set-up will work but the 1st floor will probably be toast before the 2nd is comfortable.

Sarah

 

[coopersim]

Thanks for the info.

I have two, two port valves in place already, do you think it would make more sense simply to move the existing stat to the 2nd floor?

I take on board what you are saying about the temp on the 1st floor, but I really don't know what else I can do, last night my bedroom was 13 degrees whilst it was 21 degrees on the 2st floor landing - rediculous!

 

[bster]

2 heating 2-port valves or 1 hot water valve and 1 heating valve?


BTW- TRV's on downstairs rads will prevent the rooms geeting to hot if you go for the single zone with 2 room stats configuration.

 

[coopersim]

2 two port valves (ground floor zone, and 1st and 2nd floor zone) and a three port valve - HW ??

The problem with the TRV situation is that - strangely - the landing rad is acting as a pass through - it has two fixed open valves on it - are you getting the impresison this system wasn't carefully thought out !!!!!

 

[bster]

well your in luck! just wire a thermostat to the upstairs zone valve

EDIT - just read your post again and realized that the one zone valve operates 2 floors - back to the drawing board

what is the 3 port valve feeding?

 

[coopersim]

I probably didn't explain very well to start with!

The three way port is the by pass on the MegaFlo - I think!

If it helps, I have two Myson two ports - which are connected to the stats - I know this because I can hear them click over when the stats cut in and out, and there is a Honeywell valve, which I have never heard make a noise, but there is something that I have read in the Megaflo manual which states that there must be a by pass valve - so I assume that this is it !