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.

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.

1GLAS smart thermostat installation instructions - ©2018 Johnson Controls

2

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

4GLAS smart thermostat installation instructions - ©2018 Johnson Controls

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

5GLAS smart thermostat installation instructions - ©2018 Johnson Controls

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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.

GLAS smart thermostat installation instructions - ©2018 Johnson Controls

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.

8GLAS smart thermostat installation instructions - ©2018 Johnson Controls

9

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

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