Nest Thermostat E Pro Installation & Configuration Guide Last updated: December 2017 Version: 1.
Table of Contents General Information 2 Nest Thermostat Installation Features 2 HVAC System Compatibility 3 Technical Specifications 3 How to use Pro Setup 4 Installation Overview 5 Supported Wiring 7 Nest Thermostat Connectors 7 Wiring Diagrams 8 Configuring Nest Thermostat with Pro Setup 13 How to use Pro Setup 13 How to Configure Complex Systems 14 Troubleshooting Handling Unusual Thermostat Wiring Reference Materials 15 15 18 How To Quick Reference Guide 18 Wiring Error Qui
General Information Nest Thermostat E Installation Features No jumper wires needed The Nest Thermostat does not use jumper wires, it will automatically jump terminals for you. Do not connect jumper wires to the Nest Thermostat. Before removing any wires from the old thermostat, including jumper wires, take a picture of the existing wiring configuration in case you or the homeowner need to reinstall it.
HVAC System Compatibility System Compatibility: ● ● Works with most 24V systems: gas, electric, oil, forced air, heat pump, radiant, oil, boiler, solar, and geothermal Heating and Cooling: 1 stage of heating (W1) and cooling (Y1) and a second stage of e ither heating (W2) or cooling (Y2) Y1 G R Technical Power (R, Rh, or Rc) Fan (single-speed) (G) Heat pump: with auxiliary and emergency heat (O/B, AUX) Networking requirements: Connectors: ● ● ● ● ● ● ● ● ● W1 C */OB ● ● ● Wi-Fi is required fo
How to use Pro Setup When going through setup on the Nest Thermostat, the first question in the Equipment section asks if you’re a Homeowner or Pro. Selecting Pro will take you through Pro Setup, which has additional options to help professional installers setup more complex systems. In Pro Setup, you can configure advanced settings such as alternate and primary heating sources, lockout temperatures, fan activation and more.
Installation Overview 1. Confirm system compatibility Before opening the Nest Thermostat package, check all of the wires connected to the current thermostat against the list of available connectors on the Nest Thermostat box, or use the Compatibility Checker at http://nest.com/works to show you exactly where to connect each wire. 2.
. Walk through the Setup Interview with your customer Most of the Pro Setup questions are easy for a professional to answer, but your customer should answer some of the questions like preferred temperatures and Wi-Fi passwords. 8. Allow the Nest Thermostat to update If there’s a necessary software update, the Nest Thermostat will start downloading it as soon as it connects to the internet.
Supported Wiring Nest Thermostat E Connectors Conventional connectors: Y1 Stage 1 compressor relay Y1 Stage 1 compressor relay G Fan relay G Fan relay R 24VAC power from heating/cooling transformer* R 24VAC power from heating/cooling transformer* W1 C Heat pump connectors: */ O B Stage 1 heat relay 24VAC common wire Stage 2 heat (W2), Stage 2 cool (Y2) W1 C */O B Stage 1 heat relay, Aux heat, Emergency heat 24VAC common wire Changeover valve relay (Stage 1) * No jumper wires require
Wiring Diagrams: Conventional Heating/Cooling Systems Conventional 1 Stage Heating Label: Function: Y1 Compressor Relay (Stage 1) G Fan Relay R 24VAC power from heating/cooling transformer W1 C */OB Heat Relay (Stage 1), Aux heat, Emergency heat 24VAC Common Wire † Compressor Relay (Stage 2), Heat Relay (Stage 2), Changeover Valve Relay (Stage 1) Conventional 2 Stage Heating Label: Function: Y1 Compressor Relay (Stage 1) G Fan Relay R 24VAC power from heating/cooling transformer W1 C */O
Conventional 1 Stage Cooling Label: Function: Y1 Compressor Relay (Stage 1) G Fan Relay R 24VAC power from heating/cooling transformer W1 C */OB Heat Relay (Stage 1), Aux heat, Emergency heat 24VAC Common Wire † Compressor Relay (Stage 2), Heat Relay (Stage 2), Changeover Valve Relay (Stage 1) Conventional 2 Cooling Label: Function: Y1 Compressor Relay (Stage 1) G Fan Relay R 24VAC power from heating/cooling transformer W1 C */OB Heat Relay (Stage 1), Aux heat, Emergency heat 24VAC Common
Conventional 1 Stage Heating, 1 Stage Cooling Label: Function: Y1 Compressor Relay (Stage 1) G Fan Relay R 24VAC power from heating/cooling transformer W1 C */OB Heat Relay (Stage 1), Aux heat, Emergency heat 24VAC Common Wire † Compressor Relay (Stage 2), Heat Relay (Stage 2), Changeover Valve Relay (Stage 1) Conventional 2 Stage Heating, 1 Stage Cooling Label: Function: Y1 Compressor Relay (Stage 1) G Fan Relay R 24VAC power from heating/cooling transformer W1 C */OB Heat Relay (Stage
Conventional 1 Stage Heating, 2 Stage Cooling Label: Function: Y1 Compressor Relay (Stage 1) G Fan Relay R 24VAC power from heating/cooling transformer W1 C */OB Heat Relay (Stage 1), Aux heat, Emergency heat 24VAC Common Wire † Compressor Relay (Stage 2), Heat Relay (Stage 2), Changeover Valve Relay (Stage 1) 1 Stage Heat Pump Label: Function: Y1 Compressor Relay (Stage 1) G Fan Relay R 24VAC power from heating/cooling transformer W1 C */OB Heat Relay (Stage 1), Aux heat, Emergency h
1 Stage Heat Pump with Aux Heat and Emergency Heat Label: Function: Y1 Compressor Relay (Stage 1) G Fan Relay R 24VAC power from heating/cooling transformer W1 Heat Relay (Stage 1), Aux heat, Emergency heat In this configuration both Aux and E heat are supplied using the W1 wire.
Configuring Nest with Pro Setup How to use Pro Setup When you set up the Nest Thermostat for the first time, you'll be asked if you're a professional installer. If you answer "PRO," you'll receive Pro Setup options. Pro Setup can also be accessed at any time after the Nest Thermostat is installed through the SETTINGS menu. To enter Pro Setup on the Nest Thermostat after the initial setup go to SETTINGS > PRO SETUP.
How to Configure Complex Systems Dual Fuel Systems If there’s an O/B wire and one or more W wires connected to the Nest thermostat (which indicates that the system uses a heat pump with an additional heating source), Pro Setup will first ask if the heating system is dual fuel or single fuel. For single fuel, any wires inserted into the W1 connector will be treated as auxiliary heat that will be used simultaneously with the heat pump when needed.
Troubleshooting Handling Unusual Thermostat Wiring When a B or X wire is a common wire Most thermostat manufacturers use C t o designate the connector for the common wire. However there are some Trane, American Standard, and York thermostats use B for the common wire. The NEMA standard designated the B wire as one of the change-over wires for some heat pump manufacturers. This is a simple issue to address: 1.
If the Nest thermostat isn't getting enough power from W or Y and there is no Common (“C”) wire While we find that in the vast majority of homes the Nest Thermostat can charge its built in battery by power sharing from the regular heating and cooling wires. But in some rare cases a common wire is needed to deliver consistent power to the Nest Thermostat while allowing normal operation of the heating and cooling system. If there is a common (C) wire installed the Nest Thermostat will not power share.
In a heat-only system, you need to bridge from common C to W. In a HVAC system with a Y wire, you must bridge from common C to Y. (Nest can only charge from W when Y is not connected.) Heat only systems Heating and cooling systems The heat call is detected by the controller board when the W wire is shorted to the R wire, which causes the 24V AC voltage to be detected.
Reference Materials “How To” Quick Reference Guide Action: Configuring Nest Thermostat for the installation location and HVAC system Steps: Just after installation, the Nest Thermostat will guide you through a set up interview, where you will configure it for the heating and cooling system it’s controlling and for the home or business where it’s installed. To help with HVAC configuration, the Nest Thermostat mechanically and electrically detects the wires inserted into its press connectors.
Switch between Heating, C ooling, and Range modes To switch to and from heating and cooling modes, follow these steps: Heat Pump: Setting compressor and auxiliary lockout temperatures Both auxiliary and compressor lockout temperatures can be changed in the Heat Pump section of the Equipment Settings menu. By default, the Nest Thermostat will lock out the auxiliary heater when the outdoor temperature is above 50°F but will not lockout the compressor at any temperature. 1. 2. 3.
an account and pairing the Nest Thermostat 1. 2. 3. 4. 5. 6.
Wiring error quick reference guide If the Nest Thermostat senses a problem with the wiring, you’ll receive an “E” error. These errors must be fixed before setup can continue. “N” errors are not as critical and setup will continue but certain features may not work. “W” errors indicate there is an issue with the Wi-Fi connection. “E” errors related to wires not being detected can be the result of a wire not being fully inserted into the connector or terminal.
N153 No power to W1 wire detected The Nest thermostat isn't electrically detecting the W1 wire, but one is connected to the Nest thermostat base. N154 No power to Y1 wire detected The Nest thermostat isn't electrically detecting the Y1 wire, but one is connected to the Nest thermostat base. N156 No power to G wire detected The Nest thermostat isn't electrically detecting a G wire, but one is connected to the Nest thermostat base.
Troubleshooting Quick Reference Guide Symptom: What’s going on: Nest doesn’t turn on after installation The internal battery is low and needs to charge. Red LED blinking on front Nest doesn’t turn on after installation If you leave it where it is, it will slowly charge and eventually turn on. This can take an hour or two. If you have a micro-USB cable and wall charger you can charge it more quickly over USB. The power was never turned back on.
Your customer is seeing a question mark on their Nest Thermostat when they use one of the Nest apps The Nest app will show a question mark over the thermostat when the Nest servers can’t communicate with the device. This may happen if: 1. 2. 3.
