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help with wiring up new boiler

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Matty Birch

Gas Engineer
Messages
99
hi I have just replaced a potterton promax he and cant get my head around the wiring to replace it.

5 cables in as marked on the original boiler are SL E N and 2 PFs but where was it getting the 240 from? And also why is there just 2 pump feeds going into same connector and nothing returning?

Have rang a few sparkles and non are interested as it's not a combi ... urgent help needed.

20190109_100615.jpg


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20190109_144947.jpg
 
The old boiler doesn't require permanent live

Only switch live

So old boiler switch live
Neutral
Earth
Pump live

Does the boiler require a perm live ?

Pump live goes in the left hand drawing live

Neutral and earth in right
 
so the old boiler didnt have a 240 live going into it? Not sure on the permanent live will have a look through the book now. so if I take the pump feeds to the left can I link the 240 to the Live and neutral on the pump side on the left?
 
Matty Birch said:
so the old boiler didnt have a 240 live going into it? Not sure on the permanent live will have a look through the book now. so if I take the pump feeds to the left can I link the 240 to the Live and neutral on the pump side on the left?
Click to expand...

correct only power when it was calling

why would you want to link live to pump boiler sorts the power out for the pump so no need to link anything

just put the pump feeds in there may only be a live and its getting its neutral and earth from the heating wiring centre
 
or if you dont need a per supply just put the switch live in the live terminal

20190109_144947.jpg
 
More than welcome I’m guessing it didn’t require perm live ?
 

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