Honeywell Evohome + Valliant Eco Plus 837

[skykit]

Hi all,
To start off - I am going to say I am new to this side of DIY but happy to dig in so to speak without setting off any alarm bells/fuses etc

As per the title, I have a Valliant ecoplus 837 combi with a currently installed Myson MPRT. The latter is from what I have found out a mains powered stat with 2 backup batteries?
Wires behind it as grey, brown, black and is simply an on/off stat.

Neither of the above are installed by myself or anyone I know - it was with a new build home I bought last year.

The new stat is an Honeywell evohome which comes with a BDR91

Having got into the PCB of the boiler, I have the attached image for you.


Am I correct in saying that the current RT 230V are the black/grey going into the Myson and they are now infact the A and B of the Honeywell?

The other bit to it is power - I can see the L and N on the PCB plug in turquoise and there is no 24v RT Bus used on the left.
Can I feed the L and N to the Honeywell from the Turquoise plug?
ie: put a block and split two wires out for L and two for N plugging one L and N into the PCB turquoise plug as it is now and the other two in the Honeywell?

I also see the "Opt" block in the middle which also stats N L - is that used instead/at all?

Thanks in advance

 

[flameport]

Myson MPRT. The latter is from what I have found out a mains powered stat with 2 backup batteries?

If it has batteries, it is NOT mains powered. The MPRT is a battery powered device, the mains version is MPRTMS and does not have batteries.

The BDR91 requires 3 wires - L & N for the permanent mains supply and the 3rd one connects the B terminal in the BDR to the RT terminal in the boiler.
You will also need a link from L to A in the BDR91.
You can most likely use the existing wiring, although where it is connected may need to be altered, and certainly confirmed where it actually connects to before using it.

No doubt the boiler police will be along next as you have removed the front cover of the boiler.

 

[skykit]

Thanks for your reply and correcting me!

In terms of boiler police - I suppose the assumption was that this would be an easy job. I had requested the fitting service from no less than 10 local plumbers/honeywell specialists with only one replying saying he is too busy so it seems like no one wants to install it ... only choice I had was to attempt myself/get the handyman to do it - handyman failing in this case.

It's a shame that I don't have permanent mains supply downstairs for it otherwise I'd just have the relay there

If anyone wants to take this on in Woking area, do let me know :- )

 

[skykit]

Just wanted to update the thread - decided to ditch the entire project and sent the Honeywell back for a full refund.
I still do want the kit but need to find someone now who will supply and fit without the usual overcharging :- )

Thanks for the advice flameport. Also had some nice advice offline so thank you to you too !

 

[Dan Robinson]

Charging, overcharging.... It's a relative thing.

How much profit per job do you think there should be?

 

[skykit]

I have no problems at all paying where it is deserved but this whole project kicked off because of the interest I had in the Honeywell and the first quote I got back before I attempted it myself was just short of £600.
Given the system takes apparently 1-2 hours (though the supplier fitted his in under 30 minutes), and I was going for just the base kit to start with (the BDR, Honeywell control panel and thats it), which is going for around the £200 mark... well you can do the math because this does not cost £400 to fit in labour.

So to answer your question - How much profit do I think? Well I don't really know and I'm sure there is not one rule of thumb for profit however I will never shy away from paying where it is deserved.
The handyman who attempted the fitting took 2 hours + - something I should have put a stop to after 30 minutes but he gave it a go, failed and I paid without questioning because he did try.
But £400 in labour + any profit for what is most likely something that can be done blindfolded for the right skilled person is not something I am willing to pay out for.

Hope this is a bit clearer in what I meant - there was no offence intended to those who are legit and who charge for their skillset and passion for what they do.

 

[Dan Robinson]

If we're talking about a base unit to a combi boiler, then an hours labour charge plus consumables is about right.

For what it's worth I've just corrected an installation five by a well meaning electrician. Took 3 hours to do 4 ufh zones, 8 radiator zones (with 15 rads) and hot water cylinder.

We normally block charge half or full days for anything more complicated than your described configuration.