Venstar EXPLORER RESIDENTIAL T3950-IAQ Operating instructions

&
HEAT
COOL
HEAT
PUMP
DIGITAL THERMOSTAT
Owner’s Manual and
Installation Instructions
Up to 4 Heat & 2 Cool Stages
With Air Patrol, Humidity Control,
& Dual Fuel Capable
RESIDENTIAL
T3950-IAQ

5.0
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 modifications not expressly approved by Daikin 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.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 off 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-- Connect the equipment into an outlet on a circuit different from that to which the receiver
is connected.
-- Consult the dealer or an experienced radio/TV technician for help
5.0

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.
LL’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

Table of Contents
GET TO KNOW YOUR THERMOSTAT ............................................................................
HOW TO USE YOUR THERMOSTAT...............................................................................
AIR PATROL .....................................................................................................................
SETUP STEPS - USER SETTINGS
Program Mode (non-programmable or 7 day programmable)....................................
Available Modes (heat only, cool only, heat/cool, auto) ..............................................
Backlight (on/o, intensity, nighttime dimming) ..........................................................
View equipment runtimes
(lter, heat, cool, aux heat, UV, humidier) .............................................................
Set / Reset Service Filter ..............................................................................................
Language (English, Spanish, French)...........................................................................
Setpoint limits ...............................................................................................................
Programmable fan (run fan on a schedule)..................................................................
Select Fahrenheit or Celsius.........................................................................................
Smart Recovery.............................................................................................................
Air Patrol (air quality range, fan runtime) .....................................................................
Show Clock ...................................................................................................................
Clear all messages........................................................................................................
SETUP STEPS - INSTALLER SETTINGS
*Equipment Timers and Heat/Cool spread..................................................................
*Set number of heating and cooling stages ................................................................
*Deadbands and interstage timers ..............................................................................
*Using a wired remote sensor ......................................................................................
*Which sensor to use for temperature control.............................................................
*Dry Contact Input ........................................................................................................
*Humidify / Dehumidify Outputs...................................................................................
*Automated Demand Response...................................................................................
*Humidity settings.........................................................................................................
*Lockout heatpump or electric heat on outdoor temp................................................
*Dualfuel ........................................................................................................................
*Fan O delay................................................................................................................
*Skyport (on, o) ...........................................................................................................
*Local API (on,o) .........................................................................................................
LOCKING THE KEYPAD ................................................................................................32
RESTORING FACTORY DEFAULT SETTINGS .............................................................33
TEST OUTPUTS AND CALIBRATE TEMPERATURE SENSOR ................................... 34
INSTALLATION INSTRUCTIONS...................................................................................35
GLOSSARY OF TERMS ................................................................................................. 42
TROUBLESHOOTING ....................................................................................................43
ADVANCED SETUP TABLE ...........................................................................................44
WARRANTY....................................................................................................................47

1
Backlit, Scrolling Display
Backlit Cooler & Warmer
Buttons
Backlit LCD Display
Mode Button
Heat or Cool
Demand Indicator
Red = Heat, Green = Cool
Setup Buttons Behind Door
SENSOR
Get To Know Your Thermostat

2
Setup Buttons
SENSOR
Get To Know Your Thermostat

3
Get To Know Your Thermostat
Display Features
HI
Lo
Program ONOFF
Outdoor
Fan On
COOL
AUXHEAT
Day Night
Morning
Evening
Setup Step
2nd3rd
Stage
Am
Pm
18:88
188
188
88
188
6
5
5
4
3
2
1
1Program icon—Indicates thatTime Period Programming is running
or is enabled to be set.
2Clock with Day of the Week—Indicates the current time and day.
This clock is also used to program the time period schedules.
3Outdoor icon—Indicates the temperature displayed is from the
optional outdoor sensor.
4Room Temperature Display—Indicates the current room
temperature and displays the outdoor temperature when selected.
5Mode 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.
6The scrolling display will be used to help you easily navigate
the setup screens in the thermostat.

4
Display Features
7 2nd and 3rd Stage icons
Indicates what stage of cooling or heating is currently energized.
8 Setup Step icon
Indicates the step number when the thermostat
9 Morning, Day, Evening & Night icons
Indicates the day part of the time period program.
is in the setup mode.
10 Desired SetTemperature
Indicates desired room temperature(s). Also displays
the highest and lowest temperatures for the day.
11 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.
12 icon
Press MODE, WARMER and COOLER buttons together to
toggle the keylock.
HI
Lo
Program ONOFF
Outdoor
Fan On
C OO L
A UX H EAT
Day Night
Morning
Evening
Setup Step
2nd3rd
Stage
Am
Pm
18:88
188
188
88
188
10
12
10
11
8
7
9
Get To Know Your Thermostat

5
Display Features
13 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. If Fan On is
blinking, the fan is running because Air Patrol is circulating
the air attempting to improve the quality
14 AuxHeat icon
Indicates 2nd stage electric strip heat is being used when the
thermostat is programmed for Heat Pump operation. Only the
Aux icon will appear during Cool to Dehumidify to indicate
Reheat operation.
15 Hi and Lo icons
Indicates the highest/lowest daily values for outdoor temp, wired/
wireless remote temp, indoor humidity.The high/low values reset
at midnight
HI
Lo
Program ONOFF
Outdoor
Fan On
C OO L
A UX H EAT
Day Night
Morning
Evening
Setup Step
2nd3rd
Stage
Am
Pm
18:88
188
188
88
188
16
15
14
13
15
15
14
Get To Know Your Thermostat

6
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. 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. If FAN ON is blinking,
the fan is running because of Air Patrol. The Fan button not have any effect when FAN
ON is blinking
FAN ON
AUTO

7
How to use your thermostat
Viewing Air Quality and Temperature Values
Press the SENSOR button to begin viewing the various sensors associated with this
thermostat. Note that it may take up to 30 minutes for valid sensor values after the
thermostat is first powered. Use the MODE button to cycle between sensors and
SENSOR button to return to normal operation. The values you may see (depending upon
sensors you have paired with the thermostat and whether connected to Skyweb) are :
• IAQ value and category
• VOCs
• CO2
• Indoor Relative Humidity
• Wired remote sensor
• Temperature Forecast
• Wifi remote temperature sensors with daily min/max
• VenNet remote sensors with daily min/max
Descriptions of the IAQ readings are discussed further in the Air Patrol section
on page xx. Any values that are invalid or unavailable with appear as dashes.
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.

8
Air Patrol

9
Setup Steps
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

10
Setup Steps
This thermostat features four programmable time periods per 24 hour day:
Morning, Day, Evening, and Night.The start time for each time period is
adjustable.The stop time for each time period is the start time for the next
period. Each time period, or day part may be individually disabled.
Select the Day to Program - Press the WARMER or COOLER to select
the desired Day or Week Part in the case of 5-2 (weekday – weekend)
programming.
Enable/Disable Morning Period - Press the WARMER or COOLER to select ON
or OFF. If the default ON is selected, then the Morning period will run complete
with the Mode and Set Points selected. If OFF is selected then the Morning
day part will be skipped and the thermostat will use the next day part that is
enabled.
Select Morning Mode - Press the WARMER or COOLER to select the desired
mode, which includes OFF. You may be limited by the available modes in
advanced Installer setup step#2. Press MODE to advance to the next step.
Select Morning StartTime - Press the WARMER or COOLER buttons to adjust
the time of day desired. Press MODE to advance to the next step.
Select Morning Cool Setpoint - Press the WARMER or COOLER buttons to
adjust the cool setpoint desired.This step will appear if Cool or Auto Mode
was selected in the step where the Morning mode is specified. Press MODE to
advance to the next step.
Select Morning Heat Setpoint - Press the WARMER or COOLER buttons to
adjust the heat setpoint desired.This step will appear if Heat or Auto Mode
was selected in the step where the Morning mode is specified. Press MODE to
advance to the next step.
Repeat Enable, Mode, Start Time and Setpoint programming for Day, Evening,
and Night.
“Copy Current Day to Next Day” is available - Press the UP button to Copy the
current day’s program to the next day. Press Mode again to continue copying
the following day.
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

11
Selecting Your Time Period Schedule (Setup Step 1)
This thermostat may be configured to be programmable or non programmable.
7 Day Program - Allows all seven days to be programmed independently.
Non Program - No advanced time period programming available.
Selecting Your Available Modes (Setup Step 2)
Auto-Changeover - Allows the thermostat to turn on heating or cooling based
on room temperature demand. Also allows the manual selection of HEAT only
or COOL only and OFF.
Heat and Cool - Allows the thermostat to turn on heating or cooling depending
on which one has been manually selected. Auto-Changeover is not available
when this is selected.
Heat Only - Allows the thermostat to only turn on HEAT or OFF modes.
Cool Only - Allows the thermostat to only turn on COOL or OFF modes.
Setup Steps
WARMER
COOLER
MODE
Setu
p
How to Change Settings in the Setup Screens
To enter Advanced Setup, press the SETUP button, then press MODE. Use the
WARMER or COOLER buttons to adjust the value of your selection. Press MODE to
advance to the next setup step. Press SETUP again to leave the setup screens.
*Some of the following 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

12
Setup Steps
Backlight (Setup Steps 3-8)
Backlight (Setup Step 3)
Off - Backlight turns on with any button press and turns off after 8 seconds.
On - Backlight is on continuously.
Backlight Intensity Level (Setup Step 4)
The backlight can be adjusted between Off and seven levels of brightness.
Night Dimmer (Setup Step 5)
Selecting On allows for automatic dimming of the display at night.
Press the SETUP button, then press MODE repeatedly until the
desired setup step appears. Use the WARMER or COOLER buttons
to make selection. Press MODE to advance to the next step.
Press/hold MODE to go backwards to prior steps. Press SETUP to
leave the setup screens.
WARMER
COOLER
MODE
SETU
P
Night Dimmer Brightness (Setup Step 6)
Off through seven levels of brightness
Night Dimmer Start Time (Setup Step 7)
12:00 am to 12:00 am
Night Dimmer Stop Time (Setup Step 8)
12:00 am to 12:00 am

13
Setup Steps
Resetting Service Filter (Setup Steps 9, 10)
These will show how long your fan has been running in hours and days. View both of
these steps and press FAN while viewing to reset the counter to 0. This should clear the
SERVICE FILTER message.
Current Service Filter Runtime Hours (Setup Step 9)
This counter keeps track of the number of hours of fan runtime in the Heating mode,
Cooling mode, and in stand alone Fan operation. Press FAN to reset.
Current Service Filter Calendar Days (Setup Step 10)
This counter displays the total number of calendar days that have elapsed since the
counter was reset to help the user track Fan runtime. Press FAN to reset.
Press the SETUP button, then press MODE repeatedly until the
desired setup step appears. Use the WARMER or COOLER buttons
to make selection. Press MODE to advance to the next step.
Press/hold MODE to go backwards to prior steps. Press SETUP to
leave the setup screens.
WARMER
COOLER
MODE
SETU
P

14
Setup Steps
Vacation & Away Settings
The Vacation feature allows the thermostat to use temporary,
energy saving setpoints without having to change regular programming.
The HOME/AWAY feature allows for a one button press to bring
in your stored unoccupied vacation settings. A subsequent press
of the HOME/AWAY button restores the last used comfort settings.
Press the VACATION button to enter Vacation/Away programming.
Use the WARMER and COOLER buttons to choose the number of days desired to run the in
Vacation/Away settings.
To confirm your settings and advance to the next step, press the MODE button again. Choose the
desired Vacation/Away Mode. Press the MODE again to adjust the ‘unoccupied’ setpoint. If you
selected auto changeover mode for unoccupied/vacation settings, then pressing MODE again will
allow the adjusting of the 2nd setpoint. Otherwise press MODE to confirm and return to normal
operation.
Press the VACATION button again to return to the main screen. Both VACATION and AWAY
use these same settings. VACATION button use specifies a duration of days for these settings,
whereas Away maintains these settings until the HOME/AWAY button is pressed again.
When the VACATION button is pressed and the thermostat detects that a Wi-Fi module is
installed:
During Non-Vacation Periods: the scrolling display will read:
“Use Skyport to View/Edit Settings”.
During Vacation Period: the scrolling display will read:
“To cancel VACATION press MODE button”.
NOTE: If the HOME/AWAY button is pressed during an active VACATION period, the scrolling
display will read: “To cancel VACATION press MODE button.
The thermostat must be running in Program On for VACATION to have any effect. After you alter
any settings, they will take effect until midnight on that day. The thermostat does not need to be
running in Program On for the HOME/AWAY button to have effect.
VACATION
HOME/
AWAY
Press the SETUP button, then press MODE repeatedly until the
desired setup step appears. Use the WARMER or COOLER buttons
to make selection. Press MODE to advance to the next step.
Press/hold MODE to go backwards to prior steps. Press SETUP to
leave the setup screens.
WARMER
COOLER
MODE
SETU
P

15
Emergency Heat
The Emergency Heat function is only available if your
thermostat is set to control a Heat Pump.
To initiate the Emergency Heat feature, Press the EMERGCY button. During Emergency
Heat operation the thermostat will turn on the fan and auxiliary stages of heat when
there is a demand for heat. The compressor used for heating and all stages of cooling
will be unavailable.To exit Emergency Heat, press the EMERGCY button.
EMERGCY
Setup Steps
Heating and Cooling System Runtime -
Energy Watch (Setup Steps 11-15)
Current Heat Runtime Hours (Setup Step 11)
This counter keeps track of the number of hours the system has run in
Heating. Press FAN to reset.
Current Aux Strip Heat Runtime Hours (Setup Step 12)
This counter keeps track of the number of hours the system has run in
Auxiliary Heating.This setup step is only available when the thermostat
jumpers are configured for Heat Pump and Electric Heat. Press FAN to reset.
Current Cool Runtime Hours (Setup Step 13)
This counter displays the number of hours the system has run in Cooling.
Press FAN to reset.
Current UV Lamp Calendar Days (Setup Step 14)
This counter displays the total number of calendar days that have elapsed
to help the user track UV lamp runtime. Press FAN to reset.
Current Humidifier Calendar Days (Setup Step 15)
This counter displays the total number of calendar days that have elapsed
to help the user track the Humidifier run- time. Press FAN to reset.
Press the SETUP button, then press MODE repeatedly until the
desired setup step appears. Use the WARMER or COOLER buttons
to make selection. Press MODE to advance to the next step.
Press/hold MODE to go backwards to prior steps. Press SETUP to
leave the setup screens.
WARMER
COOLER
MODE
SETU
P

16
Setup Steps
SETUP
MODE
Setup Step
30
OUTDOOR˚
These setup steps allow the user to monitor equipment runtimes and program
service alerts. Service alerts are displayed in the scrolling marquee.
Runtime hours
or days appear in
the clock display.
Press and hold FAN
to clear service alert
messages from the
scrolling marquee.
Service Filter Runtime (Setup Steps 16-17)
Set Service Filter Runtime Hours (Setup Step 16) -
This timer allows the user to specify the number of hours the fan will run
before the “Replace Filter” alert will be displayed. Press COOLER continuously
until OFF is displayed to disable this alert.
Set Service Filter Calendar Days (Setup Step 17) -
This timer allows the user to specify the number of calendar days that will
elapse before the “Replace Filter” alert will be displayed. Press COOLER
continuously until OFF is displayed to disable this feature.
UV Lamp Runtime (Setup Step 18)
Set UV Lamp Calendar Days (Setup Step 18) - This timer allows the user to
specify the number of calendar days the UV Lamp will operate before the
“Replace UV Lamp”alert will be displayed. Press COOLER continuously until
OFF appears to disable this alert.
Humidifier Runtime (Setup Step 19)
Set Humidifier Calendar Days (Setup Step 19) - This timer allows the user
to specify the number of calendar days the Humidifier will run before the
“Service Humidifier” alert will be displayed. Press COOLER continuously until
OFF appears to disable this alert.
Language (Setup Step 20)
Setup step instructions on the scrolling display can be set for English, Spanish, or
French.
FAN ON
AUTO
Press the SETUP button, then press MODE repeatedly until the
desired setup step appears. Use the WARMER or COOLER buttons
to make selection. Press MODE to advance to the next step.
Press/hold MODE to go backwards to prior steps. Press SETUP to
leave the setup screens.
WARMER
COOLER
MODE
SETU
P