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
GLAS smart thermostat installation instructions - ©2018 Johnson Controls

3GLAS 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.
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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7GLAS smart thermostat installation instructions - ©2018 Johnson Controls
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.
GLAS smart thermostat installation instructions - ©2018 Johnson Controls