Budget for upgrade to CH Controls

[tlangdon12]

Please could the heating engineers/plumbers in the trade give me an idea of how much to budget for an upgrade to the controls on my central heating system?

The system is a fully pumped, open vent system controlled by a simple two channel timer (Honeywell ST699). There are no rooms stats, no TRVs on the radiators and no cylinder stat on the DHW cylinder.

I wanted to:
- Replace the ST699 is a Honeywell CM907 (at the same position as the ST699)
- Add six TRVs to the radiators in the other rooms
- Add a cylinder stat
- Add an outdoor temperature sensor for weather compensation

I would propose to supply the CM907/TRVs/outdoor temp sensor/cylinder stat, and have the engineer supply all the other materials (fittings/cables/etc.)

Can you give me an idea how much this should cost including the labour to install everything (but excluding the parts I'm going to supply)? I'm in South Yorkshire.

Many thanks

 

[Mike Jackson]

How long is a piece of string? Without looking at the job it's not possible to tell and I would be very dubious about fitting components supplied by the customer in case of any compatibility issues.

 

[Dotty]

I agree, Much better to say to your engineer - "This is what I want" and let him get the bits.

That way you've a better warranty.

And get at least 3 quotes.

 

[SimonG]

When it comes to controls it's my way or the highway.

 

[tlangdon12]

Ok, so if I asked the engineer to supply all the parts (CM907, 6 x VT15EG TRVs, L641A cyl stat, outdoor temp sensor). How much should I budget for?

 

[Howsie]

£300 if you supply all the material and its straight forward. Just a ball park you understand;

 

[Reltub]

Does it need 'y' planning? If so you need a 3 port. I would also fit a room stat rather than the weather compensator. The y plan pack will cost £150, the trv's will cost £30 then pipe, fittings, inhibitor, cable etc. a good few hours for a sparky and then the engineers labour which is 2-4 hours.

 

[Frelon]

Why not the weather compensator?

 

[dancinplumba]

When it comes to controls it's my way or the highway.

That's two sensible things you have said this year........ Wots going on ? 🙂

 

[dancinplumba]

Why not the weather compensator?

Depends on boiler, some will most won't.....yet 🙂

 

[Reltub]

Why not the weather compensator?

Just don't fit them personally i think the cyl and room stat is sufficient.

 

[dancinplumba]

And, and if prop well insulated 🙂

 

[doitmyself]

I wanted to:

- Add an outdoor temperature sensor for weather compensation

That's only possible if your boiler is designed to work with weather compensation controls.

Which boiler do you have? (Make and exact model - GC Number would help.)

 

[SimonG]

That's two sensible things you have said this year........ Wots going on ? 🙂

I promise not to do it again 🙂 🙂

 

[tlangdon12]

Thanks to all for the replies, especially Reltub and Howsie. I'm away from the boiler to can't confirm the model number but it is an old Glowworm KFB. It's not an OpenTherm boiler, so I guess weather compensation won't be possible.

It's not clear from the Honeywell documentation whether the outdoor temp sensor is required for the Optimised Start feature, if its not then there doesn't seem any need to have the outdoor temp sensor at all.

 

[doitmyself]

... the boiler ... is an old Glowworm KFB. ...so I guess weather compensation won't be possible.

Your guess is correct.

It's not clear from the Honeywell documentation whether the outdoor temp sensor is required for the Optimised Start feature, if its not then there doesn't seem any need to have the outdoor temp sensor at all.

The outdoor sensor is not require for optimization. It's just an accessory so you can find out what the outside temperature is without having to open the front door.

Don't be surprised, after you have installed the CM907, if the radiators are not as hot as you have been used to. This is not a fault; it's a consequence of the TPI feature of the stat, which controls how often the boiler fires and for how long in order to reach and maintain the set room temperature. The important thing is that the house does reach the required temperature and maintains it without excessive fluctuation.