Discuss Call-for-heat on Boiler circuit in the Electrical Wiring, Theories and Regulations area at ElectriciansForums.net

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K

Kaysar Alim

Hi All,

Just look for a quick solution so I can complete my installation of the nest thermostat in particular the heat link.

from the image attached I'm seeking your help to understand which terminal:juggle: I should attach the call-for-heat from the heat link box for the SPDT relay.

Your help would be much appreciated.

Many thanks,
Kaysar
 

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what's the marking on 3 & 4. can't read on pic.
 
Hi All,

Just look for a quick solution so I can complete my installation of the nest thermostat in particular the heat link.

from the image attached I'm seeking your help to understand which terminal:juggle: I should attach the call-for-heat from the heat link box for the SPDT relay.

Your help would be much appreciated.

Many thanks,
Kaysar

Looks to be a Vaillant boiler. From memory left side low voltage right side 230v.

Remove red link and put nest switching across there.
 

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