Discuss Sense check on Nest / Worcester Bosch 280 wiring in the Central Heating Systems area at ElectriciansForums.net

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N

Neil Potter

I’m looking to self install a Nest Learning Thermostat on my Worcester Bosch 280 boiler, mainly as it’s a rented house, and I need to be able to remove the Nest when I leave, or when the boiler is serviced.

The wiring looks straight forward, but I just wanted to sense check before I go ahead.

The boiler doesn’t have a stat currently, so on the stat section has an unused N connection. 1 & 2 are jumpered (2 shows 240v, 1 is 0v), a 3 is unsued and unmarked, and 4 is unused and marked Frost Stat.


So I assume I can run a 4 core to the Nest Heatlink, and wire up as follows.

N from boiler to N on heatlink

2 (240v Live) from boiler to L on heatlink, and then jumper L on the heatlink to common / 2 on the heatlink (do I need to run a 3A inline fuse or not on the jumper cable?)

1 from boiler to 3 (relay open) on the Heatlink

Earth (needed or not? As Nest stat will be wireless)


Is that pretty much it, bar testing, tidying, and testing again?
 

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