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Hi,
I have a Myson programmer installed - with a Honeywell T40 thermostat (connecting back to a Potterton Suprima 50L ... on my 3rd PCB in 10 years!!!!).
I'm looking to replace the Myson with a Nest 3rd Gen (UK with heatlink).
The Myson has live / neutral - and then the black and grey are wired to HW on and CH on respectively - no connection to CH/HW off.
Has anyone replicated this on a Nest 3rd Gen? If so, I'm keen to know how to replicate the wiring in the heatlink.
It looks to me like the first poster in this thread (http://www.diynot.com/diy/threads/nest-3rd-generation-heat-link.468530/) had the same issue and wired L,N and then 3 (CH call for heat) and 6 (HW call for heat). Then ran a jumper from live to common for CH and HW (2 and 5).
Would that be right?

I'm also guessing that if I unwire the old Honeywell T40 thermostat from the 230v box - I could install the Nest there and reuse the cables to power T1/T2 between that and the heatlink?
Advice appreciated.
I have a Myson programmer installed - with a Honeywell T40 thermostat (connecting back to a Potterton Suprima 50L ... on my 3rd PCB in 10 years!!!!).
I'm looking to replace the Myson with a Nest 3rd Gen (UK with heatlink).
The Myson has live / neutral - and then the black and grey are wired to HW on and CH on respectively - no connection to CH/HW off.
Has anyone replicated this on a Nest 3rd Gen? If so, I'm keen to know how to replicate the wiring in the heatlink.
It looks to me like the first poster in this thread (http://www.diynot.com/diy/threads/nest-3rd-generation-heat-link.468530/) had the same issue and wired L,N and then 3 (CH call for heat) and 6 (HW call for heat). Then ran a jumper from live to common for CH and HW (2 and 5).
Would that be right?

I'm also guessing that if I unwire the old Honeywell T40 thermostat from the 230v box - I could install the Nest there and reuse the cables to power T1/T2 between that and the heatlink?
Advice appreciated.