Google Nest Learning Thermostat (4th gen) Installation Guide
Installation Overview - Complex Systems
Humidifiers and dehumidifiers
The Nest Learning Thermostat supports whole-home humidifiers and dehumidifiers that connect to it with one or
two low voltage wires. There are multiple Pro Setup options for wires in the Star or AQ+ connectors to control a
humidifier or dehumidifier. If you have a humidifier and a dehumidifier, one can be connected to the Star(*)
terminal, and the other can be connected to the AQ+ terminal.
Compatible wires have one of the following labels:
●
●
H, Hum, Hum1, H2, Hum2
D, DH, Dhum, Dehum, D2, DH2, Dhoom2, Dehum2
Regardless of whether your customer’s humidifier or dehumidifier has one wire or two, you will need to figure out
if it can be activated on its own or if it requires heating or cooling to be running at the same time. You’ll also need
to determine other seꢀings, such as whether the fan is required during operation.
The Nest Learning Thermostat Star (*) and AQ+ terminals are powered terminals. If you’re connecting a 2-wire
humidifier/dehumidifier, connect the wires to AQ+ and AQ-. Consult humidifier/dehumidifier installation
manual for wiring requirements.
Important note: In dual transformer installations (installations with both Rc and Rh wires) it's important to note that
different wires aꢀached to the thermostat will use different power sources. The Rc wire will provide power to the
Y1, Y2, G, and O/B terminals and AQ+ if AC- is not connected. The Rc wire will also charge the thermostat using the
C terminal. The Rh wire will provide power to W1, W2/AUX, and Star connectors. Never connect wires from dual
transformer systems to connectors from the opposite transformer.
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| General | Details |
|---|---|
| Name | Google Nest Learning Thermostat (4th gen) Installation Guide |
| Make | Nest |
| Language | English |
| Filetype | PDF (Download) |
| File size | 17.85 MB |
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