Johnson Controls GLAS User manual

Preliminary - This is information may change
1
GLAS
Installation Instructions

GLAS Smart Thermostat Installation Instructions
© 2017 Johnson Controls 2
Preliminary - This is information may change
Support
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 nd what you’re looking for? Give us a call at 1-833-297-4527(GLAS) and our techni-
cal 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. Apple, the Apple Logo and App Store are
marks and/or registered marks of Apple Inc.

GLAS Smart Thermostat Installation Instructions
© 2017 Johnson Controls
Preliminary - This is information may change
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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

GLAS Smart Thermostat Installation Instructions
© 2017 Johnson Controls 4
Preliminary - This is information may change
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
glas.johnsoncontrols.com/compatibilitychecker.
Heating One or two stages
Cooling One or two stages
Heat Pump One or two stages with one-or-two stage auxiliary heat
Fan Single-speed fan
Auxiliary Humidier, dehumidier, or ventilator (including HRV or ERV)

GLAS Smart Thermostat Installation Instructions
© 2017 Johnson Controls
Preliminary - This is information may change
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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.
YFirst stage of cooling or rst stage heat pump
Y2 Second stage of cooling command or second stage heat pump
WFirst 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 system

GLAS Smart Thermostat Installation Instructions
© 2017 Johnson Controls 6
Preliminary - This is information may change
Terminal descriptions
GFan
O/B Heat pump reversing valve (supports both O type and B type)
AUX Auxiliary - humidier, dehumidier, or ventilator
R 24 VAC Cool
Rh 24 VAC Hot
C24 VAC Common

GLAS Smart Thermostat Installation Instructions
© 2017 Johnson Controls
Preliminary - This is information may change
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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 24VAC systems.
WARNING: Risk of Electric Shock.
Disconnect 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.

GLAS Smart Thermostat Installation Instructions
© 2017 Johnson Controls 8
Preliminary - This is information may change
Turn o system power
1. Turn o 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 o.
IMPORTANT: Never work with live voltage.

GLAS Smart Thermostat Installation Instructions
© 2017 Johnson Controls
Preliminary - This is information may change
9
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.

GLAS Smart Thermostat Installation Instructions
© 2017 Johnson Controls 10
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 Wwires that are currently
connected to the control board.