Will Nest work with my heating system?

sparkymark75 · 12 Jul 2017 at 20:40

I have the following components in my heating system;

Ideal Logic Combi ESP1 35 Condensing Boiler
Honeywell Frost Protection L641B1004
Honeywell Outdoor Temperature Sensor SO10076
2 x Danfoss TP5000 Thermostat

It's a dual zone system, with no hot water tank. I'm assuming the Nest Heatlink would replace the white Danfoss box at the bottom? And the two Nest thermostats will replace the two Danfoss units?

Adam_151 · 13 Jul 2017 at 07:04

You would need two nests, each with a heatlink. You wouldn't replace the wiring centre with the heatlinks but rather connect them to it, schematically they replace the two thermostats (but are normally placed out the way near the wiring centre and the cable to the stat re-purposed for the SELV supply

sparkymark75 · 13 Jul 2017 at 08:06

Adam_151 said:
You would need two nests, each with a heatlink. You wouldn't replace the wiring centre with the heatlinks but rather connect them to it, schematically they replace the two thermostats (but are normally placed out the way near the wiring centre and the cable to the stat re-purposed for the SELV supply

So that white Danfoss box contains all the wiring and I would connect the Nest Heatlinks to that rather than opening the boiler? Both my thermostats/programmers are hard wired in, so I'm assuming/hoping swapping them out with the Nest thermostats would be fairly straightforward? I believe my boiler supports OpenTherm, are the connections for that likely to be in the Danfoss wiring box?

Telecaster · 13 Jul 2017 at 19:52

sparkymark75 said:
So that white Danfoss box contains all the wiring and I would connect the Nest Heatlinks to that rather than opening the boiler? Both my thermostats/programmers are hard wired in, so I'm assuming/hoping swapping them out with the Nest thermostats would be fairly straightforward? I believe my boiler supports OpenTherm, are the connections for that likely to be in the Danfoss wiring box?

You shouldn't be opening the boiler for anything, gas safe only for doing things like that. I've not read up too much about Nests but I seem to recall they replace/link into the motorized valve, but you have two of those so I'm not sure how it ties in.