Switched live for New Condensing system boiler

[richard911]

I am about to have my new Alpha condensing system boiler commissioned by a registered fitter, the boiler has its own pump but no time clock, I need to provide 2 lives, one permanent and one switched, the first is not an issue, its the switched live. The current system is a Y plan with the control center in the airing cupboard, the current pump will be removed and by passed, the 3 port valve will remain. My question is this can I take the switched live feed to the boiler from the wiring center, if so would it be from terminal 8 where the orange lead to the 3 port valve is, please see attached configuration.

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• richard911
• 27 Jan 2011
• 1

 

[picasso]

need to know the exact model of alpha your having installed.

 

[richard911]

Hi picasso, its an Alpha CD18S

 

[picasso]

yes the orange from the three port is the switched live to terminal 1 on the boiler (230v).

 

[richard911]

Thanx for that Picasso, ok then, here is my revised wiring center set up, would you be good enough to have a look at to see if its correct?.

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• richard911
• 28 Jan 2011
• 1

 

[picasso]

yea that looks fine, just one thing its good practise to supply the feed to external controls from the boiler so in your diagram the live to the programmer would come from terminal 2 on the boiler (along with a neutral and earth ) so everything is isolated if the boiler is isolated.

 

[richard911]

Thanx again mate

 

[D_Hailsham]

Thanx for that Picasso, ok then, here is my revised wiring center set up, would you be good enough to have a look at to see if its correct?.

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• richard911
• 28 Jan 2011
• 1

I seem to recognize that diagram!! See Switched live for new system boiler