Potterton profile 80e to Vaillant ecotec plus 430

[woodsy]

Been asked to change a Potterton to the Vaillant - not fitted the Vaillant before so looking for any possible headaches , wiring alterations etc that I need to take into account.

 

[thereisawizza]

Both use permanent lives and pump fed from boiler so no drama on the elecs, what do you normally fit?

 

[hammers4spanner]

Just turn up and see what happens thats what my boiler changes consist of keeps the fun in plumbing

 

[AllyBongo]

30Kw is a quite a big boiler, so must be quite a big system...

We had issues with the old style Vaillant 428 where it was fitted to a large system, almost at its limits (apparently). We had 22mm flow and returns from the boiler, to pump, zone valves etc. Had some circulation issues, and the boiler would run a bit strange, stayed on low burner most of the time. Changed the max output to 20Kw and it worked perfect! So worth checking out pipe sizes, Vaillant told us their 28Kw open vent boiler MUST be piped in 28mm to at least the zone valves, although they leave this out of the installation manual! :thinking:

 

[thereisawizza]

30Kw is a quite a big boiler, so must be quite a big system...

We had issues with the old style Vaillant 428 where it was fitted to a large system, almost at its limits (apparently). We had 22mm flow and returns from the boiler, to pump, zone valves etc. Had some circulation issues, and the boiler would run a bit strange, stayed on low burner most of the time. Changed the max output to 20Kw and it worked perfect! So worth checking out pipe sizes, Vaillant told us their 28Kw open vent boiler MUST be piped in 28mm to at least the zone valves, although they leave this out of the installation manual! :thinking:

Yup, 400 series very susceptible to S:53 where it retards itself to low flame, not fitted heat only for 5 years now.....

 

[AllyBongo]

Not fitted a Vaillant for about 3 years now.... right off them