Nest G4CVZ Thermostat Operation Manual

The Nest G4CVZ (Google Nest Thermostat) is a smart, affordable Wi-Fi thermostat that works with the Google Home app for easy control of your home's heating and cooling. It supports most 24V systems and offers scheduling, energy-saving features, and remote access. Below are the key specifications and operation instructions.

Key Specifications

• Type: Smart Wi-Fi thermostat for heating and cooling control
• Compatibility:
  • Most 24V HVAC systems: gas, electric, oil, heat pump
  • Heating: 1-2 stages (W1, W2)
  • Cooling: 1-2 stages (Y1, Y2)
  • Heat pump with aux (O/B, AUX)
  • Fan control (G)
  • Not compatible with line-voltage systems
• Power Source:
  • 2 x AAA 1.5V alkaline batteries
  • C-wire (24V common) or Nest Power Connector
  • Power consumption: Low, battery lasts ~1 year
• Electrical Rating:
  • 20-30 VAC input
  • Class III protection against electric shock
  • Installation Class 2 surge immunity
• Temperature Range: Operating: 32°F to 104°F (0° to 40°C); Setpoint: 40°F to 90°F (4° to 32°C)
• Operating Conditions:
  • Humidity: 20% to 90% RH non-condensing
  • Wireless: 802.11b/g/n (2.4 GHz Wi-Fi)
• Dimensions: 3.3" W x 3.3" H x 1.21" D; Weight: 4.4 oz
• Features:
  • Google Home app integration
  • Touch interface
  • Energy history and insights
  • Safety temperature alerts
  • Remote control via app
• Thermostat Configuration Options:
  • Single/multi-stage heat/cool: Up to 2/2
  • App-based scheduling
  • Compatible with Google Assistant

Operation Instructions

Initial Setup

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

• Tap + in app to add device, scan QR code.
• Connect to Wi-Fi, select heating/cooling type.
• Follow app prompts to complete setup.

Setting the Clock and Day

1. Syncs automatically via Wi-Fi.
2. Manual via app: Settings > Device > Clock.
3. Adjust time zone, format (12/24-hour).
4. Day auto-set from location services.

Operating in Non-Programmable Mode

1. Select Mode: Press thermostat to open menu, swipe to Heat, Cool, Off, Eco.
2. Adjust Temperature: Swipe up/down on screen.
3. Fan Control: Set in app: Auto or On.
4. Manual Override: Swipe for temporary change; auto-resumes schedule.

Operating in Programmable Mode

1. Factory Schedule: Default routines in app.
2. Custom Schedule:

• Open Google Home app > Thermostat > Schedule.
• Add times and temps for daily/weekly.
• Save and enable.

3. Temporary Override: Swipe on thermostat.
4. Permanent Hold: Use app to pause schedule.
5. Disable Programming: Set to manual in app.

Advanced Features

1. Energy Saving: Eco mode auto-adjusts when away.
2. Remote Control: Via Google Home app.
3. Voice Control: "Hey Google, set thermostat to 72."
4. Safety Alerts: Extreme temp notifications.

Troubleshooting

• No Display: Replace batteries, check C-wire.
  
• No Heat/Cool: Verify mode, wiring, app settings.
  
• Wi-Fi Issues: Restart device, check network.

Installation Instructions

Warning: Turn off power at breaker. Use qualified installer if unsure.

Remove Old Thermostat

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

Installing New Thermostat

1. Attach base to wall with screws.
2. Connect wires to terminals.
3. Push excess wire into wall.
4. Snap thermostat onto base.
5. Restore power, follow app setup.

Battery Location

• 2 x AAA batteries in rear compartment.
• Replace when low battery icon appears.

Wiring and Configuration

Strip wires 1/4". No polarity.

Terminal	Description
R	Power (Rh/Rc)
W1	Heat Stage 1
W2	Heat Stage 2
Y1	Cool Stage 1
Y2	Cool Stage 2
G	Fan
O/B	Changeover
C	Common

Caution: If no C-wire, use Nest Power Connector. Configure in app.