Replace existing programmer with nest 3rd gen

banthorpe · 30 Aug 2019

Have a Boulter Camray 5 oil boiler with a basic programmer. No room thermostat. Replacing with Nest 3rd gen.

Current controller has L, N, HW on, CH on connections. Nothing is connected to HW OFF or CH off.

From my understanding, after connecting L and N to Heat link I connected CH on to 3 (call for heat) and HW on to 6 (call for water). Also added link from L to 2 and 4 (common).

Note old programmer removed.

When I power up the boiler comes on but this didn't happen on old programmer. So I swapped 3 and 6 for 1 and 4 and it still came on.

Any ideas? Can't find details on how the old programmer worked so it's probably something simple.

ianmcd · 30 Aug 2019

Nest HW on (6) to terminal 4 on boiler at JP8
Nest CH on (3) to terminal 1 on boiler at JP8
you have two wires connecting to the orange wire should only be 1?

banthorpe · 30 Aug 2019

Thanks. I assume that the old programmer was not connected to same terminals? Current programmer is in a different room from boiler so the wires you see on the back of it are to another cable which routes back to the boiler. I'd like to put the heat link in the same place so wanted to use those wires if possible.

ianmcd · 30 Aug 2019

you can put the heat link there no problem

banthorpe · 30 Aug 2019

Would old programmer be connected to the same boiler terminals?

banthorpe · 30 Aug 2019

Just looked and jp8 is connected as above.

So last check - is the live link to the common terminals on the heat link correct or not needed?

ianmcd · 30 Aug 2019

banthorpe said:
Just looked and jp8 is connected as above.

So last check - is the live link to the common terminals on the heat link correct or not needed?

no need for any links

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Replace existing programmer with nest 3rd gen

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