I currently have a Y plan Central Heating system, my junction box is unusual as it contains a Omron MY4 relay, i.e. a relay that controls 3 ports RL1, RL2 and RL3 as shown from the wiring diagram below:
I would like to replace my programmer with a Nest Heat Link and the room thermostat by a Nest Thermostat. I am confident how to wire the Nest Heat Link and Thermostat (refer to second wiring diagram below), however since my junction box is using a Omron MY4 relay I do not think I can simply connect the white cable of the motorised valve to connector 3 of the Nest Heat Link. Instead I believe I should simply install a jumper cable between connectors 1 and 3 in my current junction box (shown in red) which would effectively "simulate" the original thermostat to be permanently forced to ON. Would you agree?
I would like to replace my programmer with a Nest Heat Link and the room thermostat by a Nest Thermostat. I am confident how to wire the Nest Heat Link and Thermostat (refer to second wiring diagram below), however since my junction box is using a Omron MY4 relay I do not think I can simply connect the white cable of the motorised valve to connector 3 of the Nest Heat Link. Instead I believe I should simply install a jumper cable between connectors 1 and 3 in my current junction box (shown in red) which would effectively "simulate" the original thermostat to be permanently forced to ON. Would you agree?
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