Venstar T4975-IAQ Operating instructions

DIGITAL THERMOSTAT
IAQ
Owner’s Manual and
Installation Instructions
Up to 2 Heat & 4 Cool Stages
With Air Patrol, Humidity Control,
& Light Activation
COMMERCIAL
T4975-IAQ

Follow the Installation Instructions before proceeding. Set the
thermostat mode to “OFF” prior to changing settings in setup
or restoring Factory Defaults.
CAUTIO
N
This Explorer thermostat has the ability to receive updates to its rmware.
Periodic rmware updates are released by the manufacturer to add features and/
or performance enhancements. This manual was produced reecting the most
current rmware/feature set at the time of publication, rmware rev. 5.00. Firmware
releases after rev. 5.00 may not be adequately depicted in this manual.
FCC Compliance Statement
This device complies with Part 15 of the FCC Rules. Operation is subject to the
following two conditions:
(1) this device may not cause harmful interference, and
(2) this device must accept any interference received, including interference that
may cause undesired operation.
Changes or modications not expressly approved by Venstar could void the user’s
authority to operate the equipment.
This equipment has been tested and found to comply with the limits for a Class
B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed
to provide reasonable protection against harmful interference in a residential
installation. This equipment generates, uses and can radiate radio frequency energy
and, if not installed and used in accordance with the instructions, may cause
harmful interference to radio communications. However, there is no guarantee that
interference will not occur in a particular installation. If this equipment does cause
harmful interference to radio or television reception, which can be determined
by turning the equipment o and on, the user is encouraged to try to correct the
interference by one or more of the following measures:
– Reorient or relocate the receiving antenna.
– Increase the separation between the equipment and receiver.
– Connect the equipment into an outlet on a circuit dierent from that to which the
receiver is connected.
– Consult the dealer or an experienced radio/TV technician for help

Innovation, Science and Economic Development Canada
ICES-003 Compliance Label: CAN ICES-3 (B)/NM8-3(B)
This device contains licence-exempt transmitter(s)/receiver(s) that comply with
Innovation, Science and Economic
Development Canada’s licence-exempt RSS(s). Operation is subject to the
following two conditions:
1. This device may not cause interference.
2. This device must accept any interference, including interference that may cause
undesired operation of the device.
L’émetteur/récepteur exempt de licence contenu dans le présent appareil est
conforme aux CNR d’Innovation, Sciences et Développement économique Canada
applicables aux appareils radio exempts de licence. L’exploitation est autorisée aux
deux conditions suivantes :
1. L’appareil ne doit pas produire de brouillage;
2. L’appareil doit accepter tout brouillage radioélectrique subi, même si le brouillage
est susceptible d’en compromettre le fonctionnement
FCC ID : MUH-SKYPORT14
IC: 12547A-SKYPORT14

Table of Contents
GLOSSARY OF TERMS ......................................................................................1
GET TO KNOW YOUR THERMOSTAT ...............................................................2
HOW TO USE YOUR THERMOSTAT..................................................................7
Selecting the Heat or Cool Mode ....................................................................7
Selecting your desired temperature ................................................................7
Using the Fan Button .......................................................................................7
Viewing Air Quality and Temperature Values...................................................8
Using the Override Button ...............................................................................9
Viewing only connected wi or VenNet sensor Values ...................................9
Viewing and adjusting humidity values ...........................................................9
Setting the Clock and Day .............................................................................10
Turning the schedule ON/OFF .......................................................................10
Programming a Schedule ..............................................................................10
AIR PATROL ......................................................................................................12
VENNET SENSORS...........................................................................................15
Pairing a sensor..............................................................................................15
Un-pairing a sensor........................................................................................16
Factory Defaulting a sensor...........................................................................16
SETUP STEPS
Program Mode (non-programmable or 7 day programmable) ....................17
Available Modes (heat only, cool only, heat/cool, auto) ..............................17
Backlight (on/o, intensity, nighttime dimming) ...........................................18
View equipment runtimes (lter, heat, cool, aux heat, UV, humidier) .........18
Set / Reset Service Filter ...............................................................................18
Heating and Cooling System Runtime ..........................................................19
Language (English, Spanish, French)............................................................20
Setpoint limits.................................................................................................21
*Equipment Timers and Heat/Cool spread ...................................................22
*Deadbands and Interstage Timers...............................................................23
*Minutes of Fan Purge....................................................................................24

*Using a wired remote sensor........................................................................25
*Which sensor to use for temperature control..............................................25
*Humidity settings ..........................................................................................26
*Fan O delay .................................................................................................26
Select Fahrenheit or Celsius..........................................................................27
Smart Recovery..............................................................................................27
*Dry Contact Input (polarity, use) ..................................................................28
*Humidify / Dehumidify Outputs ....................................................................29
*Light Activation .............................................................................................29
*Automated Demand Response ....................................................................30
Air Patrol (air quality range, fan runtime).......................................................32
*Skyport (on, o).............................................................................................32
*Local API (on,o)...........................................................................................32
Show Clock.....................................................................................................32
Show IAQ ........................................................................................................32
Clear all messages .........................................................................................32
LOCKING/UNLOCKING THE BUTTONS .........................................................33
HOLIDAY............................................................................................................34
CALIBRATION ...................................................................................................35
RESTORING FACTORY DEFAULT SETTINGS ................................................36
TEST OUTPUTS AND CALIBRATE TEMPERATURE SENSOR ......................37
INSTALLATION INSTRUCTIONS......................................................................38
TECHNICIAN SETUP ........................................................................................44
TROUBLESHOOTING .......................................................................................45
ADVANCED SETUP TABLE .............................................................................46
WARRANTY.......................................................................................................49
*Some of the settings are usually adjusted by the installer. It is acceptable to
have any of these steps be adjusted by the user as well. Contact Venstar if you
have further questions on the meaning of these settings

1
Glossary of Terms
Air Patrol: Feature that turns on the fan when measured air quality is below
what is desired.
Auto-Changeover: A mode in which the thermostat will turn on the heating or
cooling based on room temperature demand.
Cool Setpoint: The warmest temperature that the space should rise to before
cooling is turned on (without regard to deadband).
Deadband: The number of degrees the thermostat will wait, once a setpoint
has been reached, before energizing heating or cooling.
Dehumidify: To reduce the amount of moisture in the air.
Differential: The forced temperature dierence between the heat setpoint and
the cool setpoint.
Heat Setpoint: The coolest temperature that the space should drop to before
heating is turned on (without regard to deadband).
Humidify: To increase the amount of moisture in the air.
Icon: The word or symbol that appears on the thermostat display.
Mode: The current operating condition of the thermostat (i.e. O, Heat, Cool,
Auto).
Non-Programmable Thermostat: A thermostat that does not have the
capability of running Time Period Programming.
Override: During programmed unoccupied periods, pressing the Override
button will force the thermostat into occupied settings. During programmed
occupied periods, pressing the Override button will force the thermostat
into unoccupied settings.
Programmable Thermostat: A thermostat that has the capability of running
Time Period Programming.
Reheat: Running the cooling and 2nd stage strip heaters at the same time
in order to dehumidify the air without signicantly cooling down the room
temperature.
Temperature Swing: Same as Deadband.
Time Period Programming: A program that allows the thermostat to
automatically adjust the heat setpoint and/or the cool setpoint based on the
time of the day.

2
Backlit, Scrolling Display
Backlit Cooler & Warmer
Buttons
Backlit LCD Display
Override Button
Heat or Cool
Demand Indicator
Red = Heat, Green = Cool
Setup Buttons Behind Door
Get To Know Your Thermostat

3
Setup Buttons
Get To Know Your Thermostat

4
Get To Know Your Thermostat
Display Features
Note :You may see 2nd/3rd illuminated even though you don’t have actual
multistage equipment. This has NO EFFECT on your primary heating or
cooling - it will run whether or not you see 2nd/3rd on the display
1Clock with Day of the Week—Indicates the current time and day.
This clock is also used to program the time period schedules.
2Outdoor icon—Indicates the temperature displayed is from the
optional outdoor sensor or public weather from Skyport.
3Room Temperature Display—Indicates the current room
temperature and displays the outdoor temperature when selected.
4Mode Indicators
Selects the operational mode of the equipment.
HEAT - Indicates the heating mode.
COOL - Indicates the air conditioning mode.*
HEAT & COOL - Indicates the system will automatically
change-over between heat and cool modes as the
temperature varies.
OFF - Indicates heating and cooling are turned off.
5The scrolling display will be used to help you easily navigate
the setup screens in the thermostat.
* COOL will blink when cooling is running for dehumidifcation
HI
Lo
Program
Unoccupied123
ONOFF
Outdoor
Fan On
A UX H EAT
Override
Setup Step
2nd3rd
Stage
Am
Pm
18:88
188
188
88
188
1
2
3
4
5

5
Display Features
6 2nd and 3rd Stage icons
Indicates what stage of cooling or heating is currently energized.
Note: ‘3rd’ and ‘COOL’ will both blink when the 4th stage of
cooling is active.
7 Setup Step icon
Indicates the step number when in advanced setup.
8 Occupied & Unoccupied icons
Indicates the program number: Occupied 1, 2, 3 or Unoccupied
9 Desired SetTemperature
Indicates desired room temperature(s). Also displays
the highest and lowest temperatures for the day.
10 Wi-Fi icons
One dot will always be present and the full wifi icon will appear
when connected to the local access point. The dot will blink
when the thermostat is reaching the skyport server.
11 icon
Press MODE, WARMER and COOLER buttons together to
toggle the keylock.
Get To Know Your Thermostat
HI
Lo
Program
Unoccupied123
ONOFF
Outdoor
Fan On
A UX H EAT
Override
Setup Step
2nd3rd
Stage
Am
Pm
18:88
188
188
88
188
7
6 8
9
11
10

6
Display Features
Get To Know Your Thermostat
12 Lo icon
Indicates the lowest recorded outdoor temperature for the day.*
13 Hi icon
Indicates the highest recorded outdoor temperature
for the day.*
14 Fan On icon
Indicates constant, continuous fan operation.
When Fan On is not lit - indicates the fan will only
operate when necessary to heat or to cool.
* Hi and LoTemperatures for the day, reset at midnight.
HI
Lo
Program
Unoccupied123
ONOFF
Outdoor
Fan On
H EAT
Override
Setup Step
2nd3rd
Stage
Am
Pm
18:88
188
188
88
188
14
13
12

7
How to use your thermostat
During Setup and Programming
Press the WARMER or COOLER buttons to modify the selection.
Press the MODE button to advance and confirm through the setup steps.
Selecting the Heat or Cool Mode
Select mode by pressing the MODE button.
HEAT - Only the heating operation will
be controlled by the thermostat in this mode.
COOL - Only the cooling operation will be controlled by the thermostat in
this mode.
AUTO - Auto-Changeover will automatically select heat or cool based on
room temperature demand.
OFF - OFF indicates both heating and air conditioning systems are turned off.
Selecting your desired temperature
HEAT OR COOL MODE - Pressing the WARMER or COOLER buttons
in Heat or Cool mode will adjust only the heat or cool setpoints
individually displayed.
AUTO-CHANGEOVER MODE - Pressing the WARMER or COOLER buttons
in Auto mode will adjust both the heat and cool setpoints simultaneously.
To adjust heat and cool setpoints individually, choose HEAT mode to
adjust the heat setpoint and COOL mode to adjust the cool setpoint, then
return to AUTO mode.
Using the Fan Button
FAN ON indicates constant fan operation. FAN ON is not allowed when the
thermostat is in the OFF mode. Pressing the FAN button toggles this feature.
If you don’t see FAN ON, the fan is in auto mode and will only turn on during
a heat or cool demand. The fan is forced into auto mode when running the program and
the thermostat shows “unoccupied”. If FAN ON is blinking, the fan is running because
of Air Patrol. The FAN button does not have any effect when FAN ON is blinking.
FAN ON
AUTO

8
How to use your thermostat
%
%
Viewing Air Quality and Temperature Values
Press the SENSOR button to view the internal sensors and any optional remote sensors.
The screens may appear as follows. Press MODE to advance to the next sensor, press
SENSORS to exit this function.
Descriptions of the IAQ readings are discussed further in the Air Patrol section
on page 12. Any values that are invalid or unavailable with appear as dashes.
IAQ index
Calculated relative humidity Wired remote temp.
Highest reading
since midnight
Lowest reading
since midnight
Implied CO2 Current
air quality
Light Level
Battery strength
Signal strength
Current temp. or Humidity
Sensor ID
Will change
depending on
which sensor
type and will
show whether
viewing TEMP.
or HUMIDITY
Hi/Lo reading
since midnight
Current Outdoor Humidity
Current Outdoor Temp.
Forecast daily
HI/LO temp.

9
Using the Override Button
UNOCCUPIED OPERATION -
During programmed, unoccupied
periods, pressing the OVERRIDE button will force the thermostat into Occupied
1 settings for 30 minutes. Each press of the OVERRIDE button will add another
30 minutes of time for up to 4 hours. If the maximum time has been set,
the next press of the OVERRIDE button will reset the timer and return the
thermostat to the correct time period program for the day
OCCUPIED OPERATION - During programmed, occupied periods, pressing the
OVERRIDE button will force the thermostat into an unoccupied period for the
rest of the day. During this forced unoccupied period the OVERRIDE button will
operate as described above.
Viewing only connected wifi or VenNet Sensor Values
You may also view connected wifi and VenNet sensor values after pressing
ACCESSORY STATUS followed by COOLER button. Use MODE button to cycle
between readings. Note that battery strength of the battery powered sensors
can be viewed on these screens. Press ACCESSORY STATUS again to return to
normal operation.
Viewing and adjusting Humidity Values
Press the HUMIDITY button. The current indoor relative humidity and daily
min/max values are shown. If you wish to alter either the humidification
or dehumidification setpoints, press MODE to cycle between screens and
WARMER/COOLER to adjust the settings. Press HUMIDITY again to return to
normal operation.
How to use your thermostat
OUTDOOR
ACCSRY
HUMIDITY
OVERRIDE
NOTE: Override may only be
used when the thermostat is
set to PROGRAM ON.

10
How to use your thermostat
Turning the schedule ON/OFF
Press/release OFF | RUN HOLD TO SET to change between
PROGRAM ON and PROG OFF.
If you are unable to select PROGRAM ON, setup step #1 is most likely set for
NON-PROGRAM (non-programmable).
Programming a Schedule
Press/hold OFF | RUN HOLD TO SET until you see SET PROGRAM, followed
by some brief instructions.
Press the MODE button to start entering a schedule.
Press the WARMER or COOLER buttons to make changes.
Press the MODE button to advance to the next step.
OFF
RUN
HOLD TO SET
OFF |RUN
HOLD TO SET
Setting the Clock and Day
Not available when connected to the Skyport server
Press the SET CLOCK button. Adjust the clock using the WARMER or
COOLER buttons. Press MODE to advance to the day setting. Adjust the
day using the WARMER or COOLER buttons. Press the SET CLOCK button
to confirm settings.
TIP:To adjust the time by hours press and hold the FAN button while
pressing the WARMER or COOLER buttons.
WARMER
COOLERMODE
Set
Clock

11
How to use your thermostat
Press the OFF | RUN HOLDTO SET button to exit
Time Period Programming at any time.
OFF
RUN
HOLD TO SET
OFF |RUN
HOLD TO SET
Programming a Daily Schedule
Once the Set Program prompt appears the Mode button will step you through
the settings.When selecting a Mode for Unoccupied/Occupied, options are
OFF, HEAT, COOL, HEAT and COOL. These may be limited by the selection in
setup step #2, AVAILABLE MODES.
Set the Unoccupied Mode – Press the Warmer or Cooler buttons to choose the
mode for the Unoccupied period. The thermostat is in Unoccupied when the
Time Period Schedule is running and there is not an active Occupied period.
Adjust the Unoccupied Cool Setpoint – Press the Warmer or Cooler buttons to
adjust the Cooling setpoint for times when the thermostat is in Unoccupied.
Adjust the Unoccupied Heat Setpoint – Press the Warmer or Cooler buttons to
adjust the Heating setpoint for times when the thermostat is in Unoccupied.
Select the number of Occupied time periods – Press the Warmer or Cooler
buttons to choose the maximum number (up to 3 maximum) of Occupied time
periods in a day.
Select the Mode for the Occupied period – Press the Warmer or Cooler buttons
to choose the mode for the occupied period.
Adjust the Occupied Cool Setpoint – Press the Warmer or Cooler buttons to
adjust the Cooling setpoint for comfort.
Adjust the Occupied Heat Setpoint – Press the Warmer or Cooler buttons to
adjust the Heating setpoint for comfort.
The following steps determine when the Occupied period(s) will be active.
Enable Occupied 1 – Press the Warmer or Cooler buttons to enable (On) or to
disable (Off) Occupied 1 on Monday.
Adjust the Start Time for Occupied 1 – Press the Warmer or Cooler buttons to
adjust the start time for Occupied 1 on Monday.
Adjust the Stop Time for Occupied 1 – Press the Warmer or Cooler buttons to
adjust the stop time for Occupied 1 on Monday.
Upon pressing Mode after the above step; you will be prompted to Save and
Exit or Copy this Occupied schedule to another day.
To save and exit – Press the Program button.
To Copy Monday’s settings/schedule to Tuesday – Press Up and then Mode.
Press Mode again to copy the Monday Settings/schedule to subsequent days.
To Program Another Day – Press Down and then press the Mode button to
select the day to program. Repeat the above steps for each day you would like
to program.

12
Air Patrol
Air Patrol continually samples the Indoor Air Quality (IAQ) at the thermostat.
When Air Patrol is enabled and the Indoor Air Quality drops into the selected
category:
• The fan will turn on to circulate the air through the HVAC’s filtration
system with a 5 minute minimum runtime
• The fan will continue to operate until:
- The Indoor Air Quality improves, OR
- The fan runtime reaches its selected maximum runtime per hour,
the Air Patrol Duration
• Additionally, the thermostat’s AUX output can be asserted to control
3rd party devices such as ionizers or extra filtration*
The values for Indoor Air Quality categories are:
IAQ Index Air Quality Suggested Action
0 - 50 Excellent
51 - 100 Good
101 - 250 Moderate Ventilation suggested
> 250 Poor Increase ventilation with clean air

13
1
T4975-IAQ
2
T4975-IAQ
Air Patrol
1Select the “3 vertical dots”
in the top right corner.
1
2Select “Settings” at the bottom
of the drop-down menu.
3Select “Indoor Air
Quality” in the
shaded area of
Settings.
Setup & Configuration
Air Patrol is configured from Skyweb, Venstar’s Skyport web application.
Select an Explorer-IAQ thermostat to configure the Air Patrol settings.
3

14
Air Patrol
4Enable Air Patrol. When enabled
the Air Patrol.Threshold and
Duration settings will appear.
5Set the Air PatrolThreshold at
which Air Patrol will turn on the
HVAC fan/filtration and assert
an auxiliary output.
6Set the Air Patrol Duration.
This is the maximum the fan
is allowed to run per hour. If
the Air Quality does not reach
the next better IAQ level in this
allotted time, it will stop the fan
and resume next hour. If it is
set to 60 minutes per hour, the
fan will continue to run until the
IAQ level reaches the next level
above the selected threshold.
7Send this Air Patrol
configuration to the thermostat.
4
5
6
7

15
VenNet Sensors
Pairing a Sensor
1. Press and hold the PAIR button on the sensor for 1 second.
a. Upon release of the PAIR button, the LED
will flash twice.
b. The sensor will remain in its pairing state
for 1 minute.
2. Move the sensor to within 3 inches of the thermostat.
3. The thermostat will recognize the sensor and display
NEW SENSOR IS DETECTED.
Press WARMER to pair the sensor to the thermostat.
a. The thermostat will display PAIRING.
b. Pressing COOLER will remove the
message from the display and stop the
pairing procedure on the thermostat.
4. Once pairing is completed, you must select
the type of sensor, Remote or Outdoor.
a. At this point, the thermostat will display REMOTE SENSORTYPE,
press WARMER or COOLER to change, press MODE to accept.
I. Pressing WARMER or COOLER will allow you to choose REMOTE
SENSOR or OUTDOOR SENSOR.
II. Press FAN to accept the type of sensor chosen.
III.The thermostat will display SENSOR # IS PAIRED twice and return to
the Home Screen.
5. If set as REMOTE and you wish to use the sensor for temperature control,
alter setup steps 40 and 41 as necessary.
6.You may use Skyport to assign a logical name to the sensor.
NEW SENSOR