Rewiring Horstmann C27 from Potterton 2001

[MTBHuw]

Can anyone help me with the rewiring of my old Potterton EP2001 to my new Horstmann C27 please? They are meant to be "compatible" but have to change the back plate and rewire.

This is what I currently have:

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• MTBHuw
• 9 Sep 2013
• 1

Cable "3" is my Hot Water, "4" my Central Heating and "M" is the mains from the isolation switch. I think!

This is what I need to rewire to (according to rewire diagram on "compatibility table" from Horstmann)

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• MTBHuw
• 9 Sep 2013
• 1

http://www.horstmann.co.uk/downloads/electronicdocuments/central-heating/wiringguide.pdf

Thanks

 

[D_Hailsham]

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• MTBHuw
• 9 Sep 2013
• 1

The four terminals on the left are all Neutrals, so all three blue wires should be connected to the Neutral (N) terminal of the C27. The black link wire to the N terminal of the EP2001 can be discarded.

The four terminals on the right are all Earth, so connect the three green/yellow wires to the C27 Earth (E) terminal.

The brown wire in cable M goes to the C27 Live (L) terminal.
The brown wire in cable 4 goes to C27 terminal 4.
The brown wire in cable 3 goes to C27 terminal 3.

The red link wire from L to 5 can be discarded.

 

[MTBHuw]

Brilliant, thankyou. All swapped over and working fine so far. So fingers crossed!