No thermstat on boiler. Is it possible to install one?

Leard91

FFHillbilly said:

FreeBear said:

markin said: You have to remove the case it seems, So needs a Gas safe person?  Probably a 20min job when its being serviced.

It certainly looks that way. If it were possible to access the terminal block without removing the casing, I'd say "go ahead". But the minute you remove the casing, you need to be Gas Safe registered. 

it's possible to access the required terminal block without breaking the combustion chamber seal, so you don't actually need to be GS reg to fit a thermostat.
https://www.gassaferegister.co.uk/media/1449/who-can-legally-work-on-a-gas-appliance-factsheet.pdf

And how is this done? I can't see anyway of accessing the electricals to install the thermostat without removing the entire cover.

FFHillbilly

markin said:

FFHillbilly said:

markin said:

grumbler said:

markin said:

You could also just use a marker pen to mark 21c.

This is the CH water temperature. The OP wants a room thermostat.

No its a built in thermostat, The frost star is a big hint, And the manual confirms it.

it's a built in thermostat, for the CH water.  will go from 40-80 ish degrees C

Did you read the manual? It clearly calls it a Room Stat, and is where you would wire in a remote room stat.


""230V room stat/clock (ST10): The diagram shows the option of roomstat with programmer or roomstat only.""

Are we talking about the same thing here, the knob on the front of the boiler? thats to adjust the flow temperature of the boiler, it measures the temperature of the CH water as it returns. It can't sense the temperature of the room, as it's not in the room.

the diagram shows an option of a room stat yes, but there is no guarantee that there is a room stat fitted already, and seeing as the OP wants to fit one I highly doubt there already is one

FFHillbilly

Leard91 said:

FFHillbilly said:

FreeBear said:

markin said: You have to remove the case it seems, So needs a Gas safe person?  Probably a 20min job when its being serviced.

It certainly looks that way. If it were possible to access the terminal block without removing the casing, I'd say "go ahead". But the minute you remove the casing, you need to be Gas Safe registered. 

it's possible to access the required terminal block without breaking the combustion chamber seal, so you don't actually need to be GS reg to fit a thermostat.
https://www.gassaferegister.co.uk/media/1449/who-can-legally-work-on-a-gas-appliance-factsheet.pdf

And how is this done? I can't see anyway of accessing the electricals to install the thermostat without removing the entire cover.

you are able the cover without being gas safe registered. if you read this https://www.gassaferegister.co.uk/media/1449/who-can-legally-work-on-a-gas-appliance-factsheet.pdf it confirms that.
room stat terminals are not inside the combustion chamber sealed part of the boiler, so non GS reg persons can access them

Albermarle

FFHillbilly said:

markin said:

FFHillbilly said:

markin said:

grumbler said:

markin said:

You could also just use a marker pen to mark 21c.

This is the CH water temperature. The OP wants a room thermostat.

No its a built in thermostat, The frost star is a big hint, And the manual confirms it.

it's a built in thermostat, for the CH water.  will go from 40-80 ish degrees C

Did you read the manual? It clearly calls it a Room Stat, and is where you would wire in a remote room stat.


""230V room stat/clock (ST10): The diagram shows the option of roomstat with programmer or roomstat only.""

Are we talking about the same thing here, the knob on the front of the boiler? thats to adjust the flow temperature of the boiler, it measures the temperature of the CH water as it returns. It can't sense the temperature of the room, as it's not in the room.

the diagram shows an option of a room stat yes, but there is no guarantee that there is a room stat fitted already, and seeing as the OP wants to fit one I highly doubt there already is one

I think it will be measuring the CH water temperature as it leaves the boiler, not when it returns.

Leard91

FFHillbilly said:

Leard91 said:

FFHillbilly said:

FreeBear said:

markin said: You have to remove the case it seems, So needs a Gas safe person?  Probably a 20min job when its being serviced.

It certainly looks that way. If it were possible to access the terminal block without removing the casing, I'd say "go ahead". But the minute you remove the casing, you need to be Gas Safe registered. 

it's possible to access the required terminal block without breaking the combustion chamber seal, so you don't actually need to be GS reg to fit a thermostat.
https://www.gassaferegister.co.uk/media/1449/who-can-legally-work-on-a-gas-appliance-factsheet.pdf

And how is this done? I can't see anyway of accessing the electricals to install the thermostat without removing the entire cover.

you are able the cover without being gas safe registered. if you read this https://www.gassaferegister.co.uk/media/1449/who-can-legally-work-on-a-gas-appliance-factsheet.pdf it confirms that.
room stat terminals are not inside the combustion chamber sealed part of the boiler, so non GS reg persons can access them

Yes but I'm not sure that's the case with my boiler. It looks as though I need to take the entire cover off. I don't know if this means I'm accessing the sealed combustion chamber or not.

FreeBear

Leard91 said:

FFHillbilly said:

Leard91 said:

FFHillbilly said:

FreeBear said:

markin said: You have to remove the case it seems, So needs a Gas safe person?  Probably a 20min job when its being serviced.

It certainly looks that way. If it were possible to access the terminal block without removing the casing, I'd say "go ahead". But the minute you remove the casing, you need to be Gas Safe registered. 

it's possible to access the required terminal block without breaking the combustion chamber seal, so you don't actually need to be GS reg to fit a thermostat.
https://www.gassaferegister.co.uk/media/1449/who-can-legally-work-on-a-gas-appliance-factsheet.pdf

And how is this done? I can't see anyway of accessing the electricals to install the thermostat without removing the entire cover.

you are able the cover without being gas safe registered. if you read this https://www.gassaferegister.co.uk/media/1449/who-can-legally-work-on-a-gas-appliance-factsheet.pdf it confirms that.
room stat terminals are not inside the combustion chamber sealed part of the boiler, so non GS reg persons can access them

Yes but I'm not sure that's the case with my boiler. It looks as though I need to take the entire cover off. I don't know if this means I'm accessing the sealed combustion chamber or not.

If you do a search for images of your boiler, you'll find plenty. Most show a rubber seal/gasket around the upper half of the chassis that forms a seal with the outer casing. To get to the terminal blocks, you have to hinge down the box of electronics at the bottom - Unfortunately, this means removing the outer casing. Poor design on the part of Worcester Bosch perhaps, but they don't really want an unqualified person fiddling with stuff. A pity WB don't have small cover that can be easily popped off to expose the thermostat connections (Baxi manage it on some of their boilers).

Do not confuse "combustion chamber" with the burner & heat exchanger assembly - The combustion chamber is designed to prevent any fumes (carbon monoxide in particular) escaping should there be any leaks from the burner. It is irresponsible of (some) posters to suggest that you can remove the outer casing without understanding the purpose of it, whether there are any seals, and the legalities of doing so. 

jefaz07

Leard91 said:

FFHillbilly said:

Leard91 said:

FFHillbilly said:

FreeBear said:

markin said: You have to remove the case it seems, So needs a Gas safe person?  Probably a 20min job when its being serviced.

It certainly looks that way. If it were possible to access the terminal block without removing the casing, I'd say "go ahead". But the minute you remove the casing, you need to be Gas Safe registered. 

it's possible to access the required terminal block without breaking the combustion chamber seal, so you don't actually need to be GS reg to fit a thermostat.
https://www.gassaferegister.co.uk/media/1449/who-can-legally-work-on-a-gas-appliance-factsheet.pdf

And how is this done? I can't see anyway of accessing the electricals to install the thermostat without removing the entire cover.

you are able the cover without being gas safe registered. if you read this https://www.gassaferegister.co.uk/media/1449/who-can-legally-work-on-a-gas-appliance-factsheet.pdf it confirms that.
room stat terminals are not inside the combustion chamber sealed part of the boiler, so non GS reg persons can access them

Yes but I'm not sure that's the case with my boiler. It looks as though I need to take the entire cover off. I don't know if this means I'm accessing the sealed combustion chamber or not.

You can’t. It will interfere with the seal. There is a thick rubber seal on the top half. 

Should you employ someone to do it, it isn’t a difficult job. 

ThisIsWeird

On my GlowWorm, which from the pics and vids appears to resemble the Greenstar's build layout - but, of course, that's no g'tee - the outer front cover is decorative. It's held on by two screws. It fits loosely. It has no seals. You can see up behind it from under the boiler. The control panel sits loosely in it with a gap all around. 
Removing this front cover reveals what you also see with the GreenS - a larger upper boxed section with a screwed-down panel on it. This houses the further-sealed burner and combust chamber, the exchanger, flue parts, etc.
This upper cover 'room-seals' the boiler. The air supply to the burner, drawn in from the outside via the flue, is contained within this chamber. But even if you removed that cover, you would still not release gases into the room unless the boiler was very faulty indeed, but of course it remains a Gas-Safe area, so should not be touched unless you are competent.
Below that upper sealed section is a completely open-to-the-elements area (even with the front boiler panel in place, you can see into this section if you look up into it from under the boiler - try that with a torch) which has the fold-down front control panel, behind which lies all the wet components - divert valve, pump, P2P, stuff like that. 
So, on the GlowW, removing the front cover in no way breaches any gaseous parts, and does not require a GS to do so.
I think - I'm pretty sure - the Greenstar is similar, but obviously that ain't good enough for others to act on.

EDIT: I linked to a vid on your other thread, and this appears to show the whole front and sides coming off as one, and revealing an open upper section. So that suggests the front cover is room-sealed, so shouldn't be touched.
This model was updated, so that aspect may have changed.
If in doubt, Leard, email WB - ask if fitting ext controls is a sparky/DIY job, or requires a GS. Provide model and serial no.

FFHillbilly

Albermarle said:

FFHillbilly said:

markin said:

FFHillbilly said:

markin said:

grumbler said:

markin said:

You could also just use a marker pen to mark 21c.

This is the CH water temperature. The OP wants a room thermostat.

No its a built in thermostat, The frost star is a big hint, And the manual confirms it.

it's a built in thermostat, for the CH water.  will go from 40-80 ish degrees C

Did you read the manual? It clearly calls it a Room Stat, and is where you would wire in a remote room stat.


""230V room stat/clock (ST10): The diagram shows the option of roomstat with programmer or roomstat only.""

Are we talking about the same thing here, the knob on the front of the boiler? thats to adjust the flow temperature of the boiler, it measures the temperature of the CH water as it returns. It can't sense the temperature of the room, as it's not in the room.

the diagram shows an option of a room stat yes, but there is no guarantee that there is a room stat fitted already, and seeing as the OP wants to fit one I highly doubt there already is one

I think it will be measuring the CH water temperature as it leaves the boiler, not when it returns.

I don't think it can accurately control the temperature in the system by measuring it at the flow side, as soon as is comes out of the heat exchanger. the temperature is measured as it returns from the radiators, and then once all the radiators are up to the set temp, it stops heating the water