Application Guide

ManualsBrandsJohnson Controls ManualsHeating, Venting & CoolingGLAS 7-Day Wi-Fi Smart Programmable Clear Thermostat

Table Of Contents

Installation/General

How do I know if my system is compatible with GLAS?

GLAS works with most 24-volt heating and cooling systems, including: gas, electric, oil, radiant and

forced air. Click here to check compatibility of your system.

What is a C-wire?

A C-wire is a wire in your HVAC system that provides power to your thermostat.

If you do not have a C-wire, don’t worry. Use the included adapter and the installation instructions to

convert your heating or cooling systems to power your GLAS thermostat.

Note: Double-check your current wiring for a C-wire as wires can sometimes be hidden in the wall.

Do I need the included adapter?

If you do not have a C-wire, you will need the adapter to power your GLAS thermostat.

Note: Double-check your current wiring for a C-wire as wires can sometimes be hidden in the wall.

It doesn’t look like my wires will fit through the Air seal, can I increase the size of the wire hole?

No, the Air seal is not designed for modifications and increasing the size of the opening will reduce its

effectiveness. The air seal is made from a pliable material that is designed to stretch and accommodate

a bundle of up to ten 18-gauge copper thermostat wires, while still blocking airflow. After installing the

Air seal on the back of your GLAS device, it should be possible to push the wire bundle through without

modification.

Can I mount my GLAS device in any orientation?

No, GLAS must be installed horizontally with the display at the top of the device.

The current temperature of my home does not appear correct, why is that?

Numerous factors impact the temperature that is sensed by your thermostat. Depending on installation

location, how the device is mounted, the type of wall material, and many other factors, GLAS may sense

a temperature slightly different than the actual temperature in your space.

If you did not install the Air seal on the back of your GLAS when installing your device, we strongly

recommend doing so to prevent airflow in or out of your wall that could impact the sensed temperature.

GLAS also requires the front cover to be installed on the device to accurately sense temperature in your

home.

After double checking the installation, sometimes external factors will continue to impact the device,

and an adjustment is needed. You can apply an offset to the sensed temperature by navigating to

Summary of content (8 pages)

PAGE 1
Installation/General How do I know if my system is compatible with GLAS? GLAS works with most 24-volt heating and cooling systems, including: gas, electric, oil, radiant and forced air. Click here to check compatibility of your system. What is a C-wire? A C-wire is a wire in your HVAC system that provides power to your thermostat. If you do not have a C-wire, don’t worry. Use the included adapter and the installation instructions to convert your heating or cooling systems to power your GLAS thermostat.
PAGE 2
Settings -> Comfort -> Temp Display and adjusting the Temperature offset to match the displayed temperature on your GLAS to another external thermostat that you rely on to calibrate the temperature. We strongly recommend waiting for a few hours after installation before adjusting the offset to ensure that the sensors have fully adjusted to the environment.
PAGE 3
comfort, GLAS bypasses those minimum timers in response to user changes (such as changing setpoint or turning the control on/off) when safe to do so without harming equipment. However, when cooling or heating with a heat pump, the minimum off time is always enforced to protect the heating and cooling equipment.
PAGE 4
If you would like to make any updates to your Wi-Fi connection, go to Settings -> General -> Wi-Fi. Use the list provided to select the new network you wish to connect to and enter the password. If the network you would like to use is not shown in the list, scroll to the bottom of the screen and select Other. Type in the name and password of the network you wish to connect to. The new network will be added to the network list.
PAGE 5
GLAS will accept commands through Alexa that begin with the wake word, “Alexa,” and one of the following commands: – Set the thermostat to X degrees – Increase thermostat by X degrees – Decrease thermostat by X degrees – Set thermostat to – What’s thermostat temperature? What commands can I use for Google Assistant? GLAS will accept commands through Google Assistant with the wake words, “Ok, Goog
PAGE 6
What are home, away, and sleep temperature preferences and how do you set them? To set your temperature preferences for home, away, and sleep, go to Settings -> Comfort -> Temperature Preferences. From there you can select your desired heating and cooling temperature for each of the three modes. Sleep mode is the temperature settings you select for your waking and sleeping hours. Your regular hours can be added to your GLAS thermostat so it will automatically adjust to your schedule and repeat daily.
PAGE 7
The compressor system on your heat pump can either heat or cool your home by switching the direction that the refrigerant flows in your system. The reversing valve controls whether the system operates in a heating or cooling mode. Depending on the model of your heat pump, some switch into cooling mode when the reversing valve is powered, and others switch into heating mode when the reversing valve is powered.
PAGE 8
continuously run your fan. After selecting On, you can optionally select a specific amount of time to run the fan for before going back to Auto mode. Can GLAS continuously run my fan when I’m home or sleeping? Yes, GLAS supports a feature called Continuous fan when home. When enabled, it will cause GLAS to operate the fan continuously when your device is in a Home or Sleep state.