Wiring EPH 3 channel wireless pack

Kealyboy

Hi, I have plumbed in these heating controls and just have a couple of questions regarding the wiring to the boiler. If you look and the picture of the wiring diagram I have uploaded it shows the fused spur LNE to be wired up to the wiring centre and then the LNE from the programmer to be also wired up to the wiring centre. Considering my boiler is downstairs and the wiring centre is upstairs in the hot press can I instead wire the fused spur LNE straight to the programmer LNE terminals and then take the LNE from the programmer straight up the the wiring centre? That way I don’t have to bring 2 LNE cables up to the wiring centre and instead just one.

Second question is my boiler is an old baxi solo 2 50pf (see pictures) This boiler has a permanent live and a switch live and also the pump is wired to the boiler for pump overrun. Obviously my switch live is the grey wire coming back down from terminal 9 in the wiring centre and that has to be wired to switch live terminal on boiler. The pump will be left wired to the boiler as it is currently. Where will I take my permanent live, neutral and earth from? Can I just link them over from the LNE terminals on the programmer?

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K.Flyer

A couple of starter points..

1. It is illegal for any person to carry out ANY type of work on any Gas Appliances who is not a Registered Gas Installer.

2. The switched fused spur, which should isolate everything, should be located within 2 meters of the boiler.

3. All electrical work should be carried out by a competent person using correct materials and work practice.

If I am following you correctly, in theory yes you can go from spur with LNE to programmer to wiring centre, but more cabling will be required from the programmer to the wiring centre from each On channel to each zone valve, plus your switched live back to boiler.

I would suggest, take LNE from the spur, which should be a double pole fused switched spur, to a correct type and sized junction box (refer as JB1) at the programmer. Use either a six core or a LNE to the programmer and a separate brown black grey cable back into JB1.

From JB1 you are going to bring LNE up to your wiring centre, plus your three zone feeds, plus a line returning your switched live back from terminal 9 in your wiring centre to the boiler preferably via JB1. By bringing it back to JB1 first it allows for easy access for fault finding later.

The last part is perm live to boiler. This should then come from JB1 using a 4 core, or some prefer to use two separate cables, so you have your boiler perm live and switched live out of JB1 straight to the boiler.

Again by doing it this way allows for easier fault finding. In effect you end up with two easily accessible wiring centres.

Hope that's clear enough.

Always ensure that the electrical supply is isolated before carrying out any electrical work.

Kealyboy

Thanks you. I’ve it all wired up now and everything is working ok 👍