Nest A0001 Thermostat Operation Manual

The Nest A0001 (3rd Generation Learning Thermostat) 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 Nest 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)
- Fan: 1-3 speeds (G, G2, G3)
- Humidifier/dehumidifier (HUM, DEHUM)
Power Source:
- Voltage: 20 to 30 VAC
- Battery: Built-in rechargeable lithium-ion
- Power consumption: Less than 1 kWh/month
Electrical Rating:
- Supports systems without C-wire (Power Connector optional)
- * connector: One of W3, E, HUM, DEHUM
Temperature Range: Operating: 32°F to 104°F (0° to 40°C); Storage: -4°F to 113°F (-20° to 45°C)
Operating Conditions:
- Humidity: Up to 90% RH
- Altitude: Up to 10,000 ft
Dimensions: Display: 3.3" D x 1.06" H; Base: 3.3" D x 0.42" H; Assembled: 3.3" D x 1.21" H
Features:
- Auto-learning schedule
- Wi-Fi connectivity
- Energy reports
- Farsight display
- App and voice control
Thermostat Configuration Options:
- Multi-stage heat/cool: Up to 3/2
- Smart home integration
- Energy Star certified

Operation Instructions

Initial Setup

1. Install Hardware: Follow installation guide (see Section 3).
2. Download App: Install Google Nest app on iOS/Android.
3. Configure System:

Power on thermostat; it guides through setup.
Connect to Wi-Fi, create Nest account.
Answer questions about home and system.

Setting the Clock and Day

1. Thermostat syncs time automatically via Wi-Fi.
2. For manual: Press ring to menu, select Settings > Clock.
3. Adjust time zone, format, daylight savings.
4. Day auto-detected from schedule.

Operating in Non-Programmable Mode

1. Select Mode: Press ring to open menu, turn to Off, Heat, Cool, Eco.
2. Adjust Temperature: Turn outer ring to set desired temperature.
3. Fan Control: Via app or menu if configured.
4. Manual Override: Turn ring for temporary hold.

Operating in Programmable Mode

1. Factory Schedule: Default energy-saving settings.
2. Custom Schedule:

Press ring to menu, select Schedule, or use app.
Set times/temperatures for periods.
Save and enable Auto-Schedule learning.

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

Advanced Features

1. App Control: Remote adjust via Nest app.
2. Energy Saving: Eco mode, Home/Away Assist.
3. Voice Control: Compatible with Google Assistant, Alexa.

Troubleshooting

No Display: Check power, wiring, restart.
No Heat/Cool: Verify mode, setpoint, equipment.
Wi-Fi Issues: Restart router, check signal.

Installation Instructions

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

Remove Old Thermostat

Turn off power.
Remove cover, label wires.
Disconnect wires, remove base.

Installing New Thermostat

Mark mounting holes with level.
Drill holes, fasten base.
Connect wires.
Push excess wire into wall.
Snap display onto base.

Battery Location

Built-in rechargeable lithium-ion battery.
No user replacement needed.

Wiring and Configuration

Connect to matching terminals: R/Rh, W1/W2/W3, Y1/Y2, G, O/B, etc.

Terminal	Description
R/Rh	Power (24V)
W1	Heat Stage 1
Y1	Cool Stage 1
G	Fan
O/B	Changeover
C	Common

Caution: Use app to configure system type.