Connecting A Vaillant Combi Boiler

[mtglass]

Hi, I wonder if anyone can help with the temporary reconnection of my old Vaillant Combi boiler, fitted approx 1986.

I am carrying out extensive alterations to a property and in doing so have destructed both the Randall programmer & Honeywell room stat along with the wiring to both.

The use of the boiler, which worked perfectly prior to the programmer & stat removal, is still required for some time until a complete new system is installed.

I would appreciate if anyone could advise on how to connect up the boiler (fit a link or links @ boiler) to replace the programmer & stat.

Boiler Details: GC NO ... 47-044-01 Vaillant VCW-sine 18 T3 WE

 

[kevplumb]

View media item 16593

 

[safeboilers]

View media item 16593

The first thing you need do is disconnect the clock and stat connect the 2 black wires from the clock together isolate the brown and blue tape them up then inside the electrical box inside the boiler link number 4 and 5 together with a piece of wire and the boiler will give heating by turning up the heat control and hot water as normal okey

 

[mickyg]

inside the electrical box inside the boiler link number 4 and 5 together

DO NOT link 4 and 5. 5 is the optional neutral. This will create a short between live and neutral.

 

[kevplumb]

link 3&4

not the best of drawings i know

 

[mtglass]

Thanks guys, kevplumb, safeboilers & mickyg, sorry for the delay in replying to your res ponse,

After a being laid low with flu I got after it and I did as suggested connecting terminals 3 / 4. I turned the power on and got the pilot light on with the pump running, however, boiler wouldn't fire up.

As I had carried out major alterations to the system I was convinced that there must be an air lock so over three days or so I messed about trying to clear this air lock and low and behold it just fired up and is now working fine.

Thanks again for your advice, it was spot on.

 

[Agile]

Spot on apart from the unsafe advice to link 4 and 5 which could have done serious damage to the boiler.

I suppose in this age some people might intentionally give advice to spoil someone's boiler.

Presumably the same people who break off wing mirrors on parked cars?

 

[mtglass]

Appreciate what you're saying Agile, I was lucky mickyg & kevplumb added comments before I wired in the link.

In these forums you put your trust in the advice posted by members like you guys.

Thanks again!