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Nest, external transformer. Nest only has R terminal, no Rh or Rc

Moe Rubenzahl
2 months ago

Hi, HVAC wizards! I have a Nest (not Learning, not E) thermostat and my house has no c-wire (details below *). I want to power it using a transformer plugged in near the thermostat. I see diagrams to do this (attached) but they all show thermostats with a separate Rc and Rh terminal. My Nest only has one R terminal.

How do I hook this up? TIA...

* It's a heat-only boiler system, 12 years old, two-wire 24V, three zones and three thermostats, but I am only installing one Nest; the other two are dumb thermostats.

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