No connection on boiler to receive wiring centre - what to do?

[JohnMo]

10 hours ago, Huckleberrys said:

has a 2 stage burner, low flame and high flame...modulation of sorts

As I said above min output is 17kW. 5 UFH controlled zones, it will be zero seconds cycle time.

[Nickfromwales]

Yup. The mention of weather comp for this is nonsense, and defo needs at least 100L buffer on the circuit of UFH, but prob better off with a TS (with an integral DHW coil) instead of an UVC, but that ship has probably sailed; retro-fit buffer will now be the robust option.

 

Still amazes me how shit a selection of installers there still seems to be out there, as (most) boiler MI's dictate that the installer should surmise if the design is not within their recommended guidelines, and if not then they should "do something about it".... That's been completely ignored here afaic.

 

Oil boiler direct to UFH = 💩

[SimonD]

5 minutes ago, Nickfromwales said:

Still amazes me how shit a selection of installers there still seems to be out there,

 

Yup, this drives me mental. I did an instal (natural gas) a while back where the owner was doing a deep refurbishment. I put in the boiler with modulating controls etc. and said she should call me when it's time for the ufh. However, the guy doing the floors, ripping them out and properly insulating them etc. never called me and did it himself with some other plumbing/heating muppet.

 

Then winter came and the customer called me to say house wouldn't get hot. its a tiny cottage and they'd zoned it all up, then thrown away the brand new modulating controls for cheap shite relay ones and the system constantly short cycled.

 

The circle completed with me tearing all their crap out and putting back modulation. Hey presto no short cycling.

 

Makes my blood boil...

[sb1202]

14 hours ago, Nickfromwales said:

Ermmmm.....the installers knew this at the time I presume, and carried on anyways; knowing there were 5 actuators that needed to be connected (to a wiring centre that can take 5 Act's and 5 stat inputs per space).

No, they didn't and if you read the OP, you can see its an 8 zone wiring centre.  The navien WC is supplied as part of the kit.

14 hours ago, Nickfromwales said:

Shirley, this manufacturer does bigger wiring centres?!?

No. 

[sb1202]

14 hours ago, SimonD said:

TBH the installers could have made their life easier by just using a heatmiser UH-8 as that can also control rad ch and dhw, and then no need for the abovementioned Navien wiring centre which I assume is just like the widely used Honeywell and Drayton standard wiring centres. It would also be a lot tidier I think.

See the OP. It was originally spec'd with an 8 zone WC. The reason this has gone off topic is because someone suggested using the navien (which comes with the boiler kit).