Johnson Controls GLAS User manual

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 nd 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.
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GLAS smart thermostat 2x 1-1
/2"Pan-head Phillips screws
2x 1"Pan-head Phillips screws
2x 1"Flat-head Phillips screws
Air seal
4x Drywall anchors
Wiring stickers
Wall plate
C-wire adapter
Quick start guide
Screwdriver Drill with 1/4" bit Level
Included in the box
Tools required
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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.
Heating One or two stages
Cooling One or two stages
Heat Pump One or two stages with one or two stages auxiliary heat
Fan Single-speed fan
Auxiliary Humidier, dehumidier, or ventilator (including HRV or ERV)

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.
Y1 First stage of cooling or rst stage heat pump
Y2 Second stage of cooling or second stage heat pump
W1 First stage of conventional heating or rst stage auxiliary heat for heat pump systems
W2 Second stage of conventional heating or second stage of auxiliary heat for heat
pump systems
GFan
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Terminal descriptions
O/B Heat pump reversing valve (supports both O type and B type)
AUX Auxiliary - humidier, dehumidier, or ventilator
Rc 24 VAC Cool
Rh 24 VAC Heat
C24 VAC Common
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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.
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To begin installation, turn o system power
1. Turn o 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.
Turn o the power supply before making electrical connections. Contact
with components carrying hazardous voltage can cause electric shock and
may result in severe personal injury or death. If you have any doubts about
properly installing the device, please contact a professional installer.

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.
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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.
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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.

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GLAS smart thermostat installation instructions - ©2018 Johnson Controls
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 rmly on the
wires to push them through the air seal.

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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.
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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 Gthermostat wires that are currently
connected to the control board. Do not
disconnect any of the other wires.

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Y (1)
W(2)
R (3)
G (4)
GLAS smart thermostat installation instructions - ©2018 Johnson Controls
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 ve labeled wires on the
adapter to the corresponding terminals on
the control board.
Note: See pages 20-22 for wiring congurations.
Note: Connections for the G, Y,and R wires
are required to support the adapter.

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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.
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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 ush
against the device and press the front
plate until you hear a click.
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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 conrm your wiring. If any wires were incorrectly detected, tap to
correct them.
22. Follow the instructions on the device screen to complete the setup for your heating and
cooling system.

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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