Nest T3030EX Thermostat Operation Manual

The Nest T3030EX (Learning Thermostat 3rd Gen, Extended EU/UK) is a smart, Wi-Fi enabled thermostat that learns your schedule and preferences to optimize comfort and energy savings. It supports advanced central heating, cooling, and hot water systems, including zoned and district heating. Requires Heat Link for 230V AC setups. Integrates with 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 extended heating, cooling, and hot water control
Compatibility:
- Extended EU/UK systems: Combi/system boilers, heat pumps, zoned S/Y-plan, district heating, underfloor
- On/Off and OpenTherm modulating control
- Heating: 1-3 stages; Cooling: 1-2 stages; Dual hot water zones
- Wi-Fi for app, updates, and remote access
Power Source:
- 230 V AC/50 Hz via Heat Link
- Battery: Built-in rechargeable lithium-ion
- Power consumption: Less than 1 kWh/month
Electrical Rating:
- Heat Link: 3 A resistive/1 A inductive per relay
- OpenTherm: 42 V DC max
- ErP Class IV (On/Off) / VI (OpenTherm)
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 non-condensing
- Wireless range: Up to 30 m line of sight
Dimensions: Display: 3.3" diameter x 1.06" H; Heat Link: 3.3" x 2.8" x 1.1"; Weight: 8.6 oz (display)
Features:
- Auto-learning and True Radiant scheduling
- Wi-Fi (802.11 a/b/g/n), Bluetooth Low Energy
- 24-bit color LCD (480x480 resolution)
- Sensors: Temperature, humidity, proximity, motion, ambient light
- Energy Star/ErP certified
Thermostat Configuration Options:
- Maximum stages Heat/Cool: 3/2
- Multi-zone hot water and zoning support
- App/voice control (Google Assistant, Alexa)

Operation Instructions

Initial Setup

1. Install Heat Link: Professional wiring near boiler (see Section 3).
2. Power On: Switch on mains; display powers via wireless link.
3. Configure System:

Download Nest app, scan QR, connect Wi-Fi.
Select extended system type (zoned, underfloor, etc.), run diagnostics.
Set preferences; thermostat auto-learns schedule.

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. Zoning/Hot Water: Control individual zones via app.
4. Manual Override: Turn ring for temporary hold; resumes after period.

Operating in Programmable Mode

1. Factory Schedule: Default with extended zoning; learns routines.
2. Custom Schedule:

Press ring to menu > Schedule, or app: Devices > Thermostat > Schedule.
Set times/temps for heat, zones, hot water; copy across days.
Enable Auto-Schedule for AI 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. True Radiant: Balances boiler efficiency for underfloor systems.
2. Multi-Zone: Schedule per room/zone via app.
3. Farsight: Displays time, weather, or schedule on approach.
4. Energy Insights: Detailed reports on usage and savings.
5. Home/Away: Geo-fencing and sensor-based auto-adjust.

Troubleshooting

No Power: Check mains, Heat Link LEDs; reset via app.
Connection Loss: Verify wireless link (30m max); reposition.
No Heating/Zones: Confirm mode, app test; check valves/boiler.
Error Codes: E.g., E1 (wiring); consult app support.

Installation Instructions

Warning: 230V AC high voltage; certified professional installation only. Isolate power before work.

Remove Old Thermostat

Turn off mains at fuse board.
Remove old thermostat, note/label all wires.
Disconnect from boiler/zone valves.

Installing New Thermostat

Heat Link: Mount near boiler; connect L/N mains, relays to heating/hot water zones (1-3/4-6), OT for modulating.
Wiring to Display: Run T1/T2 from Heat Link to wall base (low voltage, screened cable recommended).
Display Base: Mount 1.2-1.5m high; connect T1/T2 (no polarity).
Attach: Snap display onto base; optional stand.
Test: Power on, app setup and diagnostics.

Battery Location

Built-in rechargeable lithium-ion battery in display unit.
Auto-charges via Heat Link; no user serviceable parts.

Wiring and Configuration

Max 2 mm² cable; professional compliance with local codes.

Heat Link Terminal	Description
L/N	230V AC mains power
1 (NC)/2 (C)/3 (NO)	Heating zone 1 relay
4 (NC)/5 (C)/6 (NO)	Hot water/zone 2 relay
OT1/OT2	OpenTherm to boiler
T1/T2	Low voltage to display

Caution: Maintain 30 cm clearance around Heat Link; configure zones in app post-install.