Vaillant GB VC112e fit smart thermostat

[rickcj007]

Got this boiler currently connected to an ACL lifestyle lp241 without a junction box and to an old Satchwell Thermostat.

I have purchased a Ketotek ktf0155c which I have wired into other boilers at our local community centre and working perfectly, but wanting to clarify the connections to this boiler. Would I connect it using the dry contacts?

 

[RandomGrinch]

Do you intend for the LP241 to stay in place, and simply swap out the Satchwell thermostat for the ktf0155c?

...and I'm afraid the way the earth wires are twisted together behind the LP241 needs sorting out immediately. These need to be connected together into a single terminal block - either a separate block, or clean up and find a screw for the earth terminal on the LP241 backplate.

 

[rickcj007]

The boiler only does heating, so probably no point in keeping the LP241. I'm actually thinking to replace it with a wiring junction box (https://www.toolstation.com/honeywell-home-10-way-junction-box/p51416) so the wires can be connected more safely.

Thanks.

 

[RandomGrinch]

The boiler only does heating, so probably no point in keeping the LP241. I'm actually thinking to replace it with a wiring junction box (https://www.toolstation.com/honeywell-home-10-way-junction-box/p51416) so the wires can be connected more safely.

Thanks.

That's a good idea.
I was trying to work out what was going on behind the LP241, but a lot of the wires just appear to be linking out the HW controls?
Do you have any zone valves in the system.

Would I connect it using the dry contacts?

If you are totally removing the existing controller, stat, wiring, and there are no other complications like zone valves; then yes, the dry contacts would connect to boiler terminals 3 and 4.

 

[rickcj007]

The white sheathed flex goes to the boiler and only uses:
Red - L
Blue - N
Earth - E
White - 3

The 3 grey sheathed flexes go to mains, thermostat and possibly a valve, but I haven't been able to check that. The boiler manual mentions 2 or 3 port motorised valves.

 

[RandomGrinch]

I wonder if you can tell me if this red wire goes to terminal 1, or terminal 3?

 

[rickcj007]

That red is going to terminal 3.