Preliminary - This is information may change GLAS Installation Instructions 1
Support Preliminary - This is information may change If at any point you need assistance, we’re here to help. Visit glas.johnsoncontrol.com/support for how-to videos and frequently asked questions. Can’t find what you’re looking for? Give us a call at 1-833-297-4527(GLAS) and our technical team can walk you through it. Before you start, download the GLAS app for easy installation. Google Play and the Google Play Logo are marks and/or registered marks of Google LLC.
Preliminary - This is information may change Included in box GLAS Thermostat 4 Screws Wall Plate 4 Drywall Anchors 4 to 5 Wire Adapter Quick Start Guide Tools required Screwdriver Drill Level 3 GLAS Smart Thermostat Installation Instructions © 2017 Johnson Controls
Compatibility Preliminary - This is information may change GLAS is compatible with most 24 VAC heating and cooling systems. Use the compatibility checker to ensure your system will work with GLAS by going to glas.johnsoncontrols.com/compatibilitychecker.
Preliminary - This is information may change Terminal descriptions Note: If you have only one R wire, connect to RC. Note: If you are replacing an existing thermostat, remove any jumper wires between R and RH or RC and RH.
Preliminary - This is information may change Terminal descriptions G Fan O/B Heat pump reversing valve (supports both O type and B type) AUX Auxiliary - humidifier, dehumidifier, or ventilator R 24 VAC Cool Rh 24 VAC Hot C 24 VAC Common GLAS Smart Thermostat Installation Instructions © 2017 Johnson Controls 6
Preliminary - This is information may change IMPORTANT: If your thermostat is built into the wall and connected to thick wires with wire nuts, or if it is labeled 110, 120, or 240 volts, you have a high voltage system that is not compatible with the GLAS Thermostat. Do not connect your thermostat to these high voltage wires. GLAS is only compatible with 24VAC systems. WARNING: Risk of Electric Shock. Disconnect the power supply before making electrical connections.
Preliminary - This is information may change Turn off system power 1. Turn off the power to your heating or cooling system at the HVAC unit electrical switch or the breaker box for the building to avoid electrocution or shock. 2. If you want to check your system power, adjust the temperature on your current thermostat enough that the system switches into heating or cooling mode. If the system does not power on in a few minutes, it is off. IMPORTANT: Never work with live voltage.
Preliminary - This is information may change Check old wiring 3. If you are replacing an existing thermostat, remove the front plate of your old thermostat and take a picture of the current wire colors and connections. This picture will come in handy when connecting your new thermostat.
Preliminary - This is information may change Connect optional 4 to 5 wire adapter Note: If you have a C-wire, skip to Step 8. If you do not have a C-wire to power your thermostat, use the included adapter to provide power. 4. Remove the cover of your furnace or air handling unit to access the control board. 5. In your HVAC equipment, disconnect any R,G,Y, or W wires that are currently connected to the control board.
Preliminary - This is information may change Connect the adapter 6. Connect the R,G,Y, or W wires to the corresponding terminal on the 4 to 5 wire adapter. Furnace Control Board 7. Connect the five included wires on the other side of the adapter to the open terminals on the control board. C Note: The adapter includes a magnet for easy mounting after installation.
Preliminary - This is information may change Removing your old thermostat 8. Before removing the wires from your thermostat terminals, use the included wiring stickers to label your wires. 9. Disconnect your old thermostat and remove the backplate Note: While disconnecting your old thermostat, use drywall-safe tape to secure the wires and keep them from falling back into the wall.
Preliminary - This is information may change Installing your GLAS 9. Remove the frontplate by pulling the top of the silver cover towards you. 10. Use a level to dry fit your GLAS and mark the wall where you plan to hang the thermostat. Then drill in the drywall anchors. 11. Pull all of the wires through the terminal opening in the GLAS thermostat.
Preliminary - This is information may change Attaching your GLAS 12. Loosely attach your GLAS to the wall using the included screws. 13. Use a level to straighten the thermostat and tighten the screws. Do not overtighten.
Preliminary - This is information may change Wiring your GLAS 14. Use the picture you took of your old wiring as a reference and connect the wires to the corresponding terminals on your new GLAS. See pages 20-39 for wiring examples. Note: You do not need to have a wire for every terminal.
Preliminary - This is information may change Attach the front plate 15. Make sure any access wire is flush against the wall and press the front plate until you hear a click.
Preliminary - This is information may change Powering on your HVAC system 16. Return to your system switch or breaker box to turn the power back on. 17. Once power has been switched on, a screen will appear on the device that shows the detected wiring. Confirm that the wiring is correct and tap on any terminals that may have been incorrectly identified. 18. Follow the instructions on the device screen to complete the setup for your HVAC equipment.
Preliminary - This is information may change GLAS Smart Thermostat Installation Instructions © 2017 Johnson Controls 18
Preliminary - This is information may change WIRING DIAGRAMS NOTE: Wire colors are for reference only. Not every installation will have wires of the same color. If you are unsure of how to properly install the unit, please contact a licensed electrician or a professional HVAC installer before attempting the installation.
Preliminary - This is information may change Traditional AC and Heat GLAS Smart Thermostat Installation Instructions © 2017 Johnson Controls 20
Preliminary - This is information may change Heat Pump 21 GLAS Smart Thermostat Installation Instructions © 2017 Johnson Controls
Preliminary - This is information may change One Stage Heat Pump with One Stage Auxiliary Heat GLAS Smart Thermostat Installation Instructions © 2017 Johnson Controls 22
Preliminary - This is information may change Traditional Heat 23 GLAS Smart Thermostat Installation Instructions © 2017 Johnson Controls
Preliminary - This is information may change Traditional AC GLAS Smart Thermostat Installation Instructions © 2017 Johnson Controls 24
Preliminary - This is information may change Self-Powered Auxiliary Device 25 GLAS Smart Thermostat Installation Instructions © 2017 Johnson Controls
Preliminary - This is information may change Furnace-Powered Auxiliary Device An integrated auxiliary system is built into a furnace or air handler that shares the same power supply as the rest of the system and only requires a single control wire.
Preliminary - This is information may change Furnace-Powered Auxiliary Device 27 GLAS Smart Thermostat Installation Instructions © 2017 Johnson Controls
Preliminary - This is information may change Two Wire Auxiliary Device without C Terminal An auxiliary device that has two terminals with the same label (HUM, DEHUM, or AUX) and no C terminal requires a relay pack for operation. 1. Connect the relay pack coil between the auxiliary device and C terminal on your GLAS device. 2. Connect the switch side of the relay pack to the two terminals on the AUX device.
Preliminary - This is information may change Two Wire Auxiliary Device without C Terminal 29 GLAS Smart Thermostat Installation Instructions © 2017 Johnson Controls
Preliminary - This is information may change Two Wire Auxiliary Device with C Terminal An auxiliary device with one C terminal that does not require a relay pack for operation. 1. Connect the C terminal of the device to the C terminal on the furnace or air handler. 2. Connect the AUX terminal of your GLAS device to the control terminal on the auxiliary device.
Preliminary - This is information may change Two Wire Auxiliary Device with C Terminal 31 GLAS Smart Thermostat Installation Instructions © 2017 Johnson Controls
Preliminary - This is information may change Dual-Stage Heat GLAS Smart Thermostat Installation Instructions © 2017 Johnson Controls 32
Preliminary - This is information may change Dual-Stage AC 33 GLAS Smart Thermostat Installation Instructions © 2017 Johnson Controls
Preliminary - This is information may change Dual-Stage Heat and Traditional AC GLAS Smart Thermostat Installation Instructions © 2017 Johnson Controls 34
Preliminary - This is information may change Dual-Stage Heat and Dual-Stage AC 35 GLAS Smart Thermostat Installation Instructions © 2017 Johnson Controls
Preliminary - This is information may change Dual-Stage Heat Pump GLAS Smart Thermostat Installation Instructions © 2017 Johnson Controls 36
Preliminary - This is information may change Dual-Stage Heat Pump with Auxiliary Heat 37 GLAS Smart Thermostat Installation Instructions © 2017 Johnson Controls
Preliminary - This is information may change Heat Pump with Dual-Stage Auxiliary Heat GLAS Smart Thermostat Installation Instructions © 2017 Johnson Controls 38
Preliminary - This is information may change Heat Pump with Auxiliary Heat 39 GLAS Smart Thermostat Installation Instructions © 2017 Johnson Controls
Preliminary - This is information may change Regulatory information to user FCC Part 15C 1. This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation. 2. This device complies with Industry Canada’s license-exempt RSSs.
Preliminary - This is information may change 41 GLAS Smart Thermostat Installation Instructions © 2017 Johnson Controls
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