Johnson Controls GLAS User Manual

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 ques-
tions.

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.

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

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)

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.

Y First stage of cooling or rst stage heat pump

Y2 Second stage of cooling command or second stage heat pump

W 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 system

Terminal descriptions

G Fan

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

C 24 VAC Common

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.

ADVERTISSEMENT: Risque de décharge électrique.

Débrancher l’alimentation avant de réaliser tout branchement élec­trique. Tout contact avec des composants conducteurs de tensions
dangereuses risque d’entraîner une décharge électrique et de provo­quer des blessures graves, voire mortelles. (need translation)

Turn o system power

2. Turn o the power to your heating or

cooling system at your breaker box to

avoid electrocution or shock.

3. If you want to check your system’s 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

Check old wiring

4. Remove the front plate of your old ther­mostat and take a picture of the current
wiring that shows the wire colors and con-

nections. This picture will come in handy

when connecting your new thermostat.

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.

5. Remove the cover of your furnace or air
handling unit to access the control board.