My ancient Honeywell thermostat died on me, and I decided I would get with the times and replace it with a Google Nest Thermostat. I have a York commercial rooftop unit with a single cooling option and three wires, so I installed it according to the configurator in the Nest app:
While it took a while for the battery to hit 3.84 volts through "power stealing", the LIN reading is 20 mA, which probably explains why certain features do not work. There is no common wire, and I decided I would not mess with running wires, considering I won't be here for much longer. So I went and got myself a 24V 2-wire adaptor, which suggested the following configuration:
- Yellow to Y1
- Green to G
- Red to RH
While it took a while for the battery to hit 3.84 volts through "power stealing", the LIN reading is 20 mA, which probably explains why certain features do not work. There is no common wire, and I decided I would not mess with running wires, considering I won't be here for much longer. So I went and got myself a 24V 2-wire adaptor, which suggested the following configuration:
- 1 wire to C
- 1 wire to RC
- Disconnect, cap and substitute the Red wire with one of the White 24V adaptor wires
- Wire in one of the 24V White wires with the Red wire to RH