Nest Learning Thermostat Operation Manual

The Nest Learning Thermostat (3rd Generation) is a smart, Wi-Fi enabled thermostat that learns your schedule and preferences to optimize comfort and energy savings. It supports multi-stage heating/cooling systems and integrates with the Google Home app for remote control. Below are the key specifications and operation instructions.

1. Key Specifications 2. Operation Instructions 2.1. Initial Setup 2.2. Setting the Clock and Day 2.3. Operating in Non-Programmable Mode 2.4. Operating in Programmable Mode 2.5. Advanced Features 2.6. Troubleshooting 3. Installation Instructions 3.1. Remove Old Thermostat 3.2. Installing New Thermostat 3.3. Battery Location 3.4. Wiring and Configuration

Key Specifications

Type: Smart learning thermostat for multi-stage heating and cooling systems
Compatibility:
- 95% of 24V HVAC systems: gas, electric, oil, forced air, heat pump, radiant
- Heating: 1-3 stages (W1, W2, W3)
- Cooling: 1-2 stages (Y1, Y2)
- Heat pump with aux/emergency heat (O/B, AUX, E)
- Humidifier/dehumidifier (HUM, DEHUM)
- Fan: 1-3 speeds (G, G1, G2, G3)
Power Source:
- Voltage: 20-30 VAC
- Battery: Built-in rechargeable lithium-ion
- Power consumption: Less than 1 kWh/month
Electrical Rating:
- Supports systems without C-wire (Nest Power Connector optional)
- * connector: One of W3, E, HUM, DEHUM, G3
Temperature Range: Setpoint: 40°F to 90°F (4° to 32°C); Operating: 32°F to 104°F (0° to 40°C)
Operating Conditions:
- Humidity: Up to 90% RH
- Altitude: Up to 10,000 ft
Dimensions: Display: 3.3 in diameter x 1.06 in H; Base: 3.3 in diameter x 0.42 in H; Assembled: 3.3 in diameter x 1.21 in H; Weight: 8.6 oz
Features:
- Auto-learning schedule
- Wi-Fi connectivity (802.11 a/b/g/n)
- 24-bit color LCD display (480x480 resolution)
- Sensors: Temperature, humidity, proximity, motion, ambient light
- Energy Star certified
Thermostat Configuration Options:
- Maximum stages Heat/Cool: 3/2
- App and voice control (Google Assistant, Alexa)

Operation Instructions

Initial Setup

1. Download App: Install Google Home app on iOS/Android, create account.
2. Power On: After installation, thermostat powers up automatically.
3. Configure System:

Follow app prompts: Scan QR code, connect Wi-Fi, answer home/system questions.
Set location, preferred temperatures.
Thermostat begins learning from day one.

Setting the Clock and Day

1. Syncs automatically via Wi-Fi.
2. Manual: Press ring to menu, turn to Settings > Clock, press to select.
3. Adjust time zone, format (12/24-hour), daylight savings.
4. Day of week auto-detected from schedule and location.

Operating in Non-Programmable Mode

1. Select Mode: Press ring toward wall to open menu, turn to Off, Heat, Cool, Eco.
2. Adjust Temperature: Turn outer ring clockwise to increase, counterclockwise to decrease.
3. Fan Control: Configure in app: Auto or On.
4. Manual Override: Turn ring for temporary hold; resumes after period.

Operating in Programmable Mode

1. Factory Schedule: Default energy-saving settings with Comfort, Eco, Sleep temps.
2. Custom Schedule:

Press ring to menu > Schedule, or use app: Devices > Thermostat > Schedule.
Set times/temps for periods; copy to days.
Enable Auto-Schedule for learning optimizations.

3. Temporary Override: Turn ring to adjust.
4. Permanent Hold: Select Hold in menu/app.
5. Disable Programming: Set manual mode in app.

Advanced Features

1. Early-On: Pre-heats/cools to reach setpoint on time.
2. Safety Temperatures: Prevents extremes (e.g., below 40°F).
3. Farsight: Shows time/weather when approached.
4. Energy Reports: Monthly Home Report in app.
5. Home/Away Assist: Auto-Eco when away via sensors/location.

Troubleshooting

Won't Turn On: Check power, wiring; charge battery if red light blinking.
Offline: Verify Wi-Fi, restart router; update firmware.
No Heat/Cool: Confirm mode, setpoint; check breakers, filters.
Help Codes: E.g., N260 (Wi-Fi issue) - restart; app has code lookup.

Installation Instructions

Warning: Turn off power at breaker. Professional install recommended for complex systems.

Remove Old Thermostat

Switch off HVAC power (multiple breakers).
Remove cover, take photo of wiring.
Remove jumper wires, label others with provided stickers.
Disconnect wires, remove base; patch wall if needed.

Installing New Thermostat

Start in App: Add device, get custom wiring diagram.
Mark/level base position, attach to wall (use trim plate optional).
Pull wires through base, connect per diagram.
Push excess wires into wall, snap display onto base.
Restore power, complete setup in app.

Battery Location

Built-in rechargeable lithium-ion in display.
Charges from 24V AC; no user replacement.
Red light indicates charging; wait if needed.

Wiring and Configuration

Follow app diagram; strip 1/4-3/8", no polarity. Do not connect high-voltage wires.

Terminal	Description
R/Rh/Rc	Power (24V hot)
W1/W2/W3	Heat stages
Y1/Y2	Cool stages
G	Fan
O/B	Heat pump changeover
AUX/E	Aux/emergency heat
C	Common (optional, use Power Connector if absent)
*	One of HUM, DEHUM, E, W3, G3

Caution: Configure system type, stages in app during setup.