I have a Nest Thermostat and a Boiler with a Hydrostat 3200.
With an R&W connection it works fine, but doesn’t have enough battery power and can run through batteries.
I tried adding the power connector, it had enough power, but wasn’t controlling the boiler at all, even though it confirmed it was connected to the R&W wire. The heat wouldn’t turn on. Tried resets etc. Restored it back to original, but wondered if anyone had a similar issue and was able to resolve it.
I have only seen this when the power connector was not connected properly. Here’s what you need to understand about those type gas boilers in the gas valves and control control systems. Some boiler control systems are not 24V AC power based. In fact they just have a control circuitry that goes through a thermostat and when that 500mV gets back to the gas valve, it starts the boiler. if your boiler has a 24V AC control system you will find a transformer and that would work. The 24V AC is needed to properly power the Nest Power Connector.
Ken, AC Cooling Wizard
Thank's for your response Ken. I can can definitely see there is a 24v connection, but unsure where I should connect a C-Wire to. The C wire is already run, I tried running it from the Z screw inside the hydrostat, but unfortunately it appears that is the low wattage you mentioned. (I didn't do any of the wiring or installation here, I am just hoping not to have to pay someone to come out for a few minutes of work.)
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