GLAS Installation Instructions
Support If at any point you need assistance, we’re here to help. Visit www.glas.johnsoncontrols.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.
Included in the box GLAS smart thermostat Air seal 2x 1-1/2" Pan-head Phillips screws 2x 1" Pan-head Phillips screws 2x 1" Flat-head Phillips screws Wall plate 4x Drywall anchors C-wire adapter Wiring stickers Quick start guide Tools required Screwdriver 2 Drill with 1/4" bit Level GLAS smart thermostat installation instructions - © 2018 Johnson Controls
Compatibility 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 www.glas.johnsoncontrols.com/compatibilitychecker.
Terminal descriptions Note: If you have only one R wire, connect to RC. Note: If you are removing an existing thermostat, remove any jumper wires between R and RH or RC and RH. You will not need these for GLAS.
Terminal descriptions O/B Heat pump reversing valve (supports both O type and B type) AUX Auxiliary - humidifier, dehumidifier, or ventilator Rc 24 VAC Cool Rh 24 VAC Heat C 24 VAC Common GLAS smart thermostat installation instructions - © 2018 Johnson Controls 5
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 24 VAC systems.
To begin installation, turn off system power 1. Turn off all power to your heating or cooling system at the HVAC unit’s electrical switch or the breaker box for the building to avoid electrocution or shock. Note: If you are not replacing an existing thermostat, skip to Step 6. 2. If you want to check your system power, adjust the temperature on your current thermostat and wait a few minutes to ensure that your heating or cooling does not power on. WARNING: Risk of Electric Shock.
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.
Removing your old thermostat 4. Before removing the wires from your thermostat terminals, use the included wiring stickers to label your wires. 5. 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.
Installing your GLAS 6. Remove the front plate by pulling the center of the silver cover toward you from the bottom. Note: Do not pull on the black sensor bar while removing the front plate as this could damage the device. 7. Use a level and the included wall plate to mark the wall where you plan to hang the thermostat. Then drill the holes using the 1/4” drill bit and push in the drywall anchors.
Installing your GLAS 8. Remove the liner over the air seal adhesive and align the seal with the drill holes on the back side of the GLAS device. Lightly press to secure. Note: If you are using the optional back plate, secure between the wall and the GLAS before screwing in the device. 9. Pull all of the wires through both the air seal and terminal opening in the GLAS smart thermostat. Press firmly on the wires to push them through the air seal.
Attaching your GLAS 10. Loosely attach your GLAS to the anchors installed in the wall using the included screws. 11. Use a level to straighten the thermostat and tighten the screws until snug. Do not overtighten.
Connect optional C-wire adapter Note: If you have a C-wire at your thermostat, skip to Step 16. If you do not have a C-wire to power your thermostat, use the included C-wire adapter to provide power. 12. Remove the cover of your furnace or air handling unit to access the control board and take a picture of the current wiring for reference. 13. In your HVAC equipment, disconnect the Y, W, R, or G thermostat wires that are currently connected to the control board. Do not disconnect any of the other wires.
Connect the C-wire adapter 14. Remove the adapter cover and connect the now disconnected Y, W, R, or G wires to the corresponding terminal on the C-wire adapter. 15. Connect the five labeled wires on the adapter to the corresponding terminals on the control board. Y (1) W(2) R (3) G (4) Note: See pages 20-22 for wiring configurations. Note: Connections for the G, Y, and R wires are required to support the adapter.
Wiring your GLAS 16. Use the picture you took of your old wiring and the wiring stickers as a reference and connect the wires to the corresponding terminals on your new GLAS. See pages 23-43 for wiring examples. Note: Depending on the features of your furnace or air handler, you may not have a connection for every terminal.
Attach the front plate 17. Before replacing the cover, remove the red tab to the right of the wiring terminals by pulling straight out. This will enable the backup battery in your device. 18. Make sure any excess wire is flush against the device and press the front plate until you hear a click.
Powering on your heating and cooling system 19. Return to your heating and cooling system switch or breaker box to turn the power back on. 20. Once power has been switched on, wait for the welcome screen with the GLAS logo and select Tap to continue. After continuing, you will be prompted to accept the End User License Agreement and then the Privacy Notice and Terms of Service to access Internet-enabled features. 21. You will be prompted to confirm your wiring.
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.
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Heating and Cooling without C-wire (Optional AUX) GLAS C Air Handler Control Board AUX RC G W1 Y1 W2 Y2 RH O C-wire adapter Y W Y WIRES IN WALL TO GLAS DEVICE Y1 W1 RC G W O R G R C AUX G C Y (1) W(2) R (3) G (4) To GLAS *Any additional wires should bypass the C-wire adapter AUX 20 GLAS smart thermostat installation instructions - © 2018 Johnson Controls
Cooling Only without a C-wire (Optional AUX) GLAS Air Handler Control Board C AUX RC G W1 Y1 W2 Y2 RH O C-wire adapter Y W Y Y1 WIRES IN WALL TO GLAS DEVICE O W R G R C AUX G C Y (1) W(2) RC G R (3) G (4) To GLAS *Any additional wires should bypass the C-wire adapter AUX GLAS smart thermostat installation instructions - © 2018 Johnson Controls 21
Heat Pump with Auxiliary Heat without C-wire (Optional AUX) GLAS Air Handler Control Board C AUX RC G W1 Y1 W2 Y2 RH O C-wire adapter Y W Y WIRES IN WALL TO GLAS DEVICE Y1 W1 RC G W O R G R C AUX G C Y (1) W(2) R (3) G (4) To GLAS *Any additional wires should bypass the C-wire adapter 22 O AUX GLAS smart thermostat installation instructions - © 2018 Johnson Controls
Traditional AC and Heat HVAC System Control Board red we e Povice n rnac De Ru Fu AUX R Furnace C Outdoor AC Unit C AUX RC G W1 Y1 W2 Y2 RH O GLAS smart thermostat installation instructions - © 2018 Johnson Controls C RC Heat Stage 1 Fan Cool Stage 1 C RC W1 G Y1 23
Heat Pump HVAC System Control Board red wee e Povic n rnac De Ru Fu AUX R C RC Fan C RC G Compressor Reversing Stage 1 Valve Furnace Y1 O C Heat Pump 24 C AUX RC G W1 Y1 W2 Y2 RH O GLAS smart thermostat installation instructions - © 2018 Johnson Controls
One Stage Heat Pump with One Stage Auxiliary Heat HVAC System Control Board C RC Aux Heat Stage 1 Fan C RC W1 G Compressor Command Reversing Stage 1 Valve Furnace red wee e Povic n rnac De Ru Fu AUX R Y1 O C Heat Pump C AUX RC G W1 Y1 W2 Y2 RH O GLAS smart thermostat installation instructions - © 2018 Johnson Controls 25
Traditional Heat red we e Povice n rnac De Ru Fu AUX R C Furnace 26 C AUX RC G W1 Y1 W2 Y2 RH O HVAC System Control Board C RC Heat Stage 1 C RC W1 NOTE: When there is only one transformer, the RC terminal is used. NOTE: Forced air heating systems often have a G wire to run the fan independently, but not all systems use a G wire.
Traditional AC HVAC System Control Board C RC Fan Cool Stage 1 C RC G Y1 Air Handler red we e Povice n rnac De Ru Fu AUX R C Outdoor AC Unit C AUX RC G W1 Y1 W2 Y2 RH O GLAS smart thermostat installation instructions - © 2018 Johnson Controls 27
Self-Powered Auxiliary Device HVAC System Control Board C C R Switch AUX Device AUX RC Relay 24 VAC AUX Device C AUX C AUX RC G W1 28 Coil RC Y1 W2 Y2 RH O GLAS smart thermostat installation instructions - © 2018 Johnson Controls
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.
Furnace-Powered Auxiliary Device HVAC System Control Board C RC Heat Stage 1 Fan Cool Stage 1 AUX C RC W1 G Y1 AUX AUX Device red wee e Povic n rnac De Ru Fu AUX R C Furnace 30 C AUX RC G W1 Y1 W2 Y2 RH O GLAS smart thermostat installation instructions - © 2018 Johnson Controls
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. Note: For information on how to obtain a relay pack, contact the nearest Johnson Controls® representative. 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.
Two Wire Auxiliary Device without C Terminal AUX Device HUM 1 HUM 2 HVAC System Control Board C Relay Humidifier 32 Switch RC 24 VAC C AUX RC G W1 Y1 W2 Y2 RH O C Coil RC AUX GLAS smart thermostat installation instructions - © 2018 Johnson Controls
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.
Two Wire Auxiliary Device with C Terminal HVAC System Control Board C 2-Wire AUX Device AUX Device C RC C C AUX RC G W1 34 RC AUX AUX C Y1 W2 Y2 RH O GLAS smart thermostat installation instructions - © 2018 Johnson Controls
Dual-Stage Heat HVAC System Control Board C R Heat Stage 1 Heat Stage 2 C R W1 W2 red wee ic e Po ev n rnac D Ru Fu AUX R C Furnace C AUX RC G W1 Y1 W2 Y2 RH O GLAS smart thermostat installation instructions - © 2018 Johnson Controls 35
Dual-Stage AC HVAC System Control Board Air Handler red wee e Povic n rnac De Ru Fu AUX R C RC Fan C RC G Cool Stage 1 Y1 Cool Stage 2 Y2 C AC Unit 36 C AUX RC G W1 Y1 W2 Y2 RH O GLAS smart thermostat installation instructions - © 2018 Johnson Controls
Dual-Stage Heat and Traditional AC HVAC System Control Board red wee e Povic n rnac De Ru Fu AUX R Furnace C RC C RC Heat Heat Stage 1 Stage 2 W1 W2 Fan Cool Stage 1 G Y1 C AC Unit C AUX RC G W1 Y1 W2 Y2 RH O GLAS smart thermostat installation instructions - © 2018 Johnson Controls 37
Dual-Stage Heat and Dual-Stage AC HVAC System Control Board red wee e Povic n rnac De Ru Fu AUX R Furnace C RC Heat Stage 1 Heat Stage 2 Fan C RC W1 W2 G Cool Stage 1 Y1 Cool Stage 2 Y2 C AC Unit 38 C AUX RC G W1 Y1 W2 Y2 RH O GLAS smart thermostat installation instructions - © 2018 Johnson Controls
Dual-Stage Heat Pump HVAC System Control Board C RC G C RC G Compressor Commands Heat/Cool Reversing Stage 1 Stage 2 Valve Furnace red wee e Povic n rnac De Ru Fu AUX R C Heat Pump C AUX RC G W1 Y1 W2 Y2 RH O GLAS smart thermostat installation instructions - © 2018 Johnson Controls Y1 Y2 O 39
Dual-Stage Heat Pump with Auxiliary Heat HVAC System Control Board Furnace Aux Heat Commands Compressor Commands Heat/Cool Reversing Heat Valve Stage 1 Fan Stage 1 Stage 2 C RC C RC W1 G Y1 Y2 O red wee ic e Po ev n rnac D Ru Fu AUX R C Heat Pump 40 C AUX RC G W1 Y1 W2 Y2 RH O GLAS smart thermostat installation instructions - © 2018 Johnson Controls
Heat Pump with Dual-Stage Auxiliary Heat HVAC System Control Board Heat Pump C AUX RC G W1 Y1 W2 Y2 RH O GLAS smart thermostat installation instructions - © 2018 Johnson Controls C Aux Heating Commands Compressor Commands Heat Heat Cool Reversing RC Stage 1 Stage 2 Fan Stage 1 Valve C RC W1 W2 G Y1 O 41
Traditional Heat/AC with Dual Transformers Boiler/Heat Control Board C R W1 42 R C AUX RC G W1 Boiler Air Handler/Cooling Control Board C Y1 G Air Handler red wee e Povic n rnac De Ru Fu AUX R C Y1 W2 Y2 RH O Outdoor AC Unit GLAS smart thermostat installation instructions - © 2018 Johnson Controls
Regulatory information to user FCC Part 15C/Industry Canada Radio Equipment Standards 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.
44 GLAS smart thermostat installation instructions - © 2018 Johnson Controls
Part No. 24-11158-00016, Rev.
