Johnson Controls S1-THXU280 User manual

Letter: ST-002-2017
Date: April 6, 2017
To: All Unitary Products Branch Service, Sales, and Training Managers
All Unitary Products Distribution Service, Sales, and Training Managers
Subject: S1-THXU280 (B, W) Thermostat software update for
Variable Capacity air conditioner or heat pump
Product: S1-THXU280, S1-THXU280B, S1-THXU280W HxTM Touch-screen
Thermostat
This is an update to service tips letter ST-012-16 released on October 31, 2016.
The S1-THXU280 HxTM Touch-screen Thermostat released in May of 2016 previously
required a software update to work with communicating equipment. The software update
had to be manually pushed to the thermostat by the technical services group.
With the introduction of the Variable Capacity air conditioner and heat pump models the
thermostats must have a software update to control these new models. The update will
be done automatically if the thermostat has a WiFi internet connection.
To use this thermostat in communicating mode install it at the customers location and
wire the thermostat using A+, R, C, B- connections from the thermostat to communicating
equipment. If using this thermostat with communicating equipment other than the new
Variable Capacity air conditioner or heat pump, you must set all indoor and outdoor
equipment jumpers. If using the thermostat with Variable Capacity outdoor equipment,
the outdoor equipment will control airflow during heat pump heating or cooling. You must
set the HEAT jumper on the indoor equipment regardless if you are using a TM*V gas
furnace or an air handler with field installed electric heat. Once all equipment jumpers
are properly set, apply power to the system and perform thermostat setup. The S1-
THXU280 thermostat does not contain communicating software therefore it will not
recognize the indoor equipment automatically. Set the thermostat up for conventional
equipment operation even though it is not wired for conventional control. The next step
will require connecting the thermostat to the WiFi internet connection at the installed
location. Instructions on connecting the thermostat to WiFi are located in the
homeowner’s quick reference guide shipped with each thermostat. If the thermostat is
connected to the internet the WiFi status indicator will be green in color. See the image
below for an example.
Unitary Products
Technical Services
Service Tips Letter

Once the thermostat is connected to the internet through WiFi and after a 5 minute period,
it will automatically download the most up to date communicating software available. See
the image below of a thermostat software update.
This software update should take approximately 1 minute. Once the software update is
completely installed, restore factory defaults. To restore the thermostat factory defaults
enter the installer service menu by pressing the gear icon on the home screen then press
and hold the service van icon as shown below.

Once service mode is entered scroll down to the bottom of listed setup options and
choose “restore defaults” as shown below.
Once “restore defaults” is selected, you will enter the “restore defaults” screen. This
screen is shown on the following page. Press and hold the 5 icon as shown below for 5
seconds and defaults will be restored.

After factory defaults have been restored, the thermostat will find the previously wired
communicating equipment and it will enter the auto setup mode.
This latest software update applies to all HxTM Touch-screen Thermostat models that
have already been shipped from Source #1 and may be in your inventory. The S1-
THXU280 model does not contain ANY software for communicating equipment and must
be updated to use it as a communicating thermostat.
The S1-THXU280B and S1-THXU280W already contain a version of software that will
allow them to communicate with communicating capable equipment with the exception of
the Variable Capacity air conditioner or heat pump. ALL three thermostats WILL require
a software update if applied with the Variable Capacity air conditioner or heat pump.
The HxTM Touch-screen Thermostat is NOT compatible if using our communicating
zoning panel with communicating equipment. For communicating zoning applications
continue to use the S1-TTSCC0* thermostat models with 3.06z firmware. The Variable
Capacity air conditioner or heat pump is NOT compatible in a zoning application at this
time and will NOT communicate with the communicating zone panel.
All Source #1 inventory of HxTM Touch-screen Thermostats shipped on or after April 3rd,
2016 contain communicating software that will operate with ALL communicating capable
equipment including the Variable Capacity air conditioner and heat pump.
If you have any questions on this feel free to call Unitary Products Group Technical
Services at 1-877-UPG-SERV and speak with a technical support representative.
Casey McConnaughy
Field Service Supervisor
UPG Technical Services
Johnson Controls Unitary Products