Daikin DT4273C Troubleshooting guide

High Resolution
TouchScreen Digital Thermostat
for
Commercial Use
Now with
Wi-Fi
On Board
Owner’s
Manual &
Installation
Guide
model DT4273C COMMERCIAL with Humidity Control

i
FCC Compliance Statement
This equipment has been tested and found to comply with the limits for an
intentional radiator, pursuant to Part 15, subpart C 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 in radio communications.
However, there is no guarantee that the 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 different from that of the
receiver.
• Consult the dealer or an experienced radio orTV technician for help.
Notice: Only peripherals complying with FCC limits may be attached to this
equipment. Operation with noncompliant peripherals or peripherals not
recommended by Daikin, is likely to result in interference to radio and TV
reception. Changes or modifications to the product, not expressly approved by
Daikin could void the user’s authority to operate the equipment.
FCC - INDOOR Mobile Radio Information:
To comply with FCC/IC RF exposure limits for general population / uncontrolled
exposure, the antenna(s) used for this transmitter must be installed to provide a
separation distance of at least 20 cm from all persons and must not be co-located
or operating in conjunction with any other antenna or transmitter.
This Device complies with Industry Canada License-exempt RSS standard(s).
Operation is subject to the following two conditions: 1) this device may not
cause interference, and 2) this device must accept any interference, including
interference that may cause undesired operation of the device.
Follow the Installation Instructions before proceeding. Set the
thermostat mode to “OFF” prior to changing settings in setup
or restoring Factory Defaults.
CAUTION

This color touchscreen has the ability to receive updates to its firmware.
Periodically firmware updates are released by the manufacturer to add features
and/or performance enhancements.This manual was produced reflecting the
most current firmware/feature set at the time of publication, firmware rev. 4.04.
Firmware releases after rev. 4.04 may not be adequately depicted in this manual.
Please refer to the appropriate website or contact your place of purchase to learn
about changes to the thermostat after firmware release 4.04.
Under Industry Canada regulations, this radio transmitter may only operate using
an antenna of a type and maximum (or lesser) gain approved for the transmitter
by Industry Canada.To reduce potential radio interference to other users, the
antenna type and its gain should be so chosen that the equivalent isotropically
radiated power (e.i.r.p.) is not more than that necessary for successful
communication.
Cet appareil est conforme avec Industrie Canada, exempts de licence standard
RSS(s). Son fonctionnement est soumis aux deux conditions suivantes: 1) ce
dispositif ne doit pas causer d’interférences, et 2) ce dispositif doit accepter
toute interférence, y compris les interférences qui peuvent causer un mauvais
fonctionnement de l’appareil.
En vertu des règlements d’Industrie Canada, cet émetteur de radio ne peut
fonctionner en utilisant une antenne d’un type et maximale (ou moins) Gain
approuvé pour l’émetteur par Industrie Canada. Pour réduire les interférences
radio potentielles aux autres utilisateurs , le type d’antenne et son gain doivent
être choisis afin que la puissance isotrope rayonnée équivalente (PIRE) ne est pas
plus de ce qui est nécessaire pour une communication réussie.
We, Daikin, declare under our sole responsibility that the device to which
this declaration relates: 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.
ii
MUH-SKYPORT2

iii
Glossary of Terms
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.
Differential:The forced temperature difference between the heat
setpoint and the cool setpoint in Auto Mode.
Heat Setpoint:The coolest temperature that the space should drop
to before heating is turned on (without regard to deadband).
Icon: The word or symbol that appears on the thermostat display.
Mode: The current operating condition of the thermostat
(i.e. Off, Heat, Cool, Auto).
Non-Programmable Thermostat: A thermostat that does not have
the capability of running Time Period Programming.
Override: Changing the state from occupied to unoccupied, or
from unoccupied to occupied settings.
Programmable Thermostat: A thermostat that has the capability of
running Time Period Programming.
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. Same as Schedule.

iv
Table of Contents
GET TO KNOW YOUR THERMOSTAT
Home Screen ........................................................................................ 1
Menu Screens....................................................................................... 1
Dropdown Dashboard ........................................................................... 2
Care and Use of Your Thermostat ......................................................... 3
QUICK START
Selecting Your Desired Temperature and Mode.................................... 4
Time Period Schedule........................................................................... 4
Using the Fan Button ............................................................................ 4
Using the Override Button..................................................................... 5
Setting the Time & Date........................................................................ 6
Setting the Time.............................................................................. 7
Setting the Date .............................................................................. 8
Daylight Savings Setup................................................................... 8
Connecting to Wi-Fi......................................................................... 9
WiFi Set up - Create a Skyport Account......................................... 10
MAIN MENU BUTTONS
SCHEDULE............................................................................................ 12
View My Schedule......................................................................... 13
Edit My Schedule .......................................................................... 13
FAN SETTINGS...................................................................................... 15
Fan On/Off Auto ............................................................................ 16
Occupied Fan State ...................................................................... 16
Fan Purge ..................................................................................... 16
Fan Purge Timer............................................................................ 16
SCREENSAVER ..................................................................................... 17
Screensaver On/Off ....................................................................... 18
ScreensaverSetup ......................................................................... 18
Screensaver Preview..................................................................... 18
ALERTS ................................................................................................ 19
View Current Alerts........................................................................ 20
Reset Alerts ................................................................................... 20
Set/Edit Reminders........................................................................ 20
Service Information (Who To Call For Service) .............................. 20

v
Table of Contents
DISPLAY ............................................................................................ 21
Active Brightness ...................................................................... 22
Idle Brightness .......................................................................... 22
Night Dimmer ............................................................................ 22
Maintenance.............................................................................. 23
PREFERENCES .................................................................................. 24
User Interface Themes .............................................................. 25
Custom Wallpaper ..................................................................... 25
Heat/Cool Indicator.................................................................... 25
Sound Options ........................................................................... 25
HUMIDITY.......................................................................................... 26
Humidification Settings ............................................................. 27
Dehumidification Settings ......................................................... 27
HOLIDAYS.......................................................................................... 28
Holiday Schedule On/Off............................................................ 29
Edit Holidays.............................................................................. 29
Preset Holidays.......................................................................... 31
SECURITY.......................................................................................... 32
Auto Screenlock ........................................................................ 33
Setpoint Limits .......................................................................... 33
INFORMATION ................................................................................... 34
My Thermostat .......................................................................... 35
View Runtime Graphs................................................................ 35
Who to Call for Service.............................................................. 35
SETTINGS.......................................................................................... 36
Thermostat Name...................................................................... 40
Available Modes ........................................................................ 40
SD Card (Import and Export)...................................................... 40

vi
Table of Contents
GENERAL SETUP ................................................................................40
Units (F or C)..................................................................................40
Language ......................................................................................41
Smart Recovery On/Off..................................................................41
AUTOMATED DEMAND RESPONSE .....................................................42
INSTALLATION SETTINGS ...................................................................56
Heat & Cool Stages........................................................................56
Heat & Cool Stages....................................................................56
Compressor Stages...................................................................56
Aux Heat Stages ........................................................................56
Timers & Deadbands .....................................................................56
Heat Pump Settings.......................................................................58
Heat Pump Lockout - Enabled/Disabled ...................................58
Heat Pump Lockout Outdoor Temp ...........................................58
Aux Heat Lockout Enabled/Disabled.........................................58
Aux Heat Lockout Temp ............................................................58
AUX Output Settings......................................................................59
Fan Off Delay.................................................................................60
Sensor Settings.............................................................................60
Control Sensor .........................................................................60
Wired Sensor ...........................................................................60
Calibrate Sensors.....................................................................60
Test Outputs ..................................................................................60
Dealer Information ........................................................................61
Upgrade Firmware ........................................................................61
Delete Custom Images ..................................................................61
Calibrate Clock ..............................................................................61
Reset to Factory Default Settings..................................................61
Restart Thermostat........................................................................61

vii
Table of Contents
WI-FI ..................................................................................................62
Status..............................................................................................63
Setup ..............................................................................................63
Local API .........................................................................................63
Secure API.......................................................................................64
SKYPORT.............................................................................................67
Account..........................................................................................67
EMERGENCY HEAT ..............................................................................68
TOUCHSCREEN ASSISTANT................................................................69
Installing the TouchScreen Assistant Software ..................................69
Uploading Photos ...............................................................................70
INSTALLATION INSTRUCTIONS..........................................................71
Remove & Replace the Old Thermostat ..............................................71
Wire Connections................................................................................72
Determining Your Existing Wiring and Equipment ..............................73
Making 4 Wires Work When 5 Wires Are Required..............................75
Making 5 Wires Work When 6 Wires Are Required..............................76
The TouchScreen Thermostat Backplate ............................................77
Explanation Of the Thermostat Dip Switches......................................78
Sample Wiring Diagrams ....................................................................79
TROUBLESHOOTING.............................................................................81
INDEX .....................................................................................................82
WARRANTY ............................................................................................86

1
1
Get To Know Your Thermostat
Home Screen
Sub Menu Screen
Home Button
Sub Menu
Buttons
Scrolling
Buttons
Main Menu Screen
Scrolling
Buttons
Back
Button
Menu
Buttons
Indicates Options
Available
Backlit ColorTouch Display
Date &Time
Fan Button
Override Button
OutdoorTe mperature
Cooler
Button
Warmer
Button
SD Card
Slot
Menu
Button
Mode Buttons
(If optional accessory is used
or connected to Skyport)
Indoor Humidity Reading
Connectivity Symbol
Drop Down
Sensor Button
Not connected
to Wi-Fi
Connected to local
access point w/IP
address without
Skyport enabled
Connected to local
access point w/IP
address, but not yet
connected to Skyport
Connected to Skyport
Connectivity Symbol Table

2
Get To Know Your Thermostat
Drop Down
Dashboard Button
Weather
Display
Outdoor
Temp
Room
Temp
Wi-Fi
Connection
Icon
Dropdown Dashboard
(The contents of your Dashboard may vary)
Press the HOME button to
return to the Home Screen
Not connected
to Wi-Fi
Connected to local
access point w/IP
address without
Skyport enabled
Connected to local
access point w/IP
address, but not yet
connected to Skyport
Connected to Skyport
Connectivity Symbol Table
Dropdown Dashboard
The Dropdown Dashboard displays temperature, humidity, and other
readings. It will also show the high and low readings of the day.

3
Get To Know Your Thermostat
Care and Use of Your Thermostat
Pencils, pens and other sharp objects should never be used on your
thermostat; these may damage your touchscreen. Only use your
finger tip to press the touchscreen buttons.
Use a soft, damp cloth to clean the screen.
DO NOT USE ABRASIVE CLEANERS OR CLEANERSTHAT CONTAIN
SOLVENTS. DO NOT SPRAY ANYTHING DIRECTLY ONTO THE
THERMOSTAT.

4
Quick Start - Temperature, Modes & Fan
Cool
Setpoint Warmer
Button
Fan
Cooler
Button
Heat
Setpoint
Selecting Your Desired Temperature and Mode
The Heat or Cool Setpoint is the
temperature the room has to
reach before heating or cooling
will turn on.
(Without regard to deadband)
Press or to adjust temperature
Press or the MODE Icon
To turn on the preprogrammed time period schedule, select RUN.
To turn off the preprogrammed time period schedule, select STOP.
Using the Fan Button
Press the FAN Icon
FAN ON fan runs constantly even in OFF Mode.
FAN AUTO fan only runs with a heating or cooling demand.
HEAT will allow only heat operation.
COOL will allow only cool operation.
AUTO will allow both Heat and Cool operation.
OFF - heating and cooling systems are turned off.
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.
HEAT OR COOL MODE - Pressing the WARMER or COOLER buttons in Heat or Cool mode
will adjust only the heat or cool setpoints.
Press or the MODE Icon
Time Period Schedule

5
Using the Override Button
Unoccupied Operation - During programmed, unoccupied periods, pressing
the OVERRIDE button will force the thermostat into Occupied 1 settings. When
the OVERRIDE button is pressed, a timer screen will appear and allow the user
to choose from 30 minutes to up to 4 hours of override time.
To turn off the override timer, press the OVERRIDE button and when the timer
screen appears, press CANCEL OVERRIDE.
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.
Holiday Operation - During Holiday Mode, pressing the OVERRIDE button will
force the thermostat into Occupied 1 settings. When the OVERRIDE button
is pressed, a timer screen will appear and allow the user to choose from 30
minutes to up to 4 hours of override time. To turn off the override timer, press
the OVERRIDE button and when the timer screen appears, press CANCEL
OVERRIDE.
NOTE: Override may only be
used when the thermostat
is set to Program RUN or
Holiday ON modes.
OVERRIDE
Override
Quick Start - Override

6
Quick Start - Set Time & Date
Set Current Time
Use AM/PM - ON
Set Time & Date
Set Current Date
Daylight Savings Setup
Daylight Savings Time - OFF
Start Schedule
Starts On
Day
Month
Stop Schedule
Ends On
Day
Month
(2nd)
(Sun)
(March)
(1st)
(Sun)
(November)
NOTE: When the thermostat is connected to a Skyport account,
theTime & Date are automatically synchronized to the Skyport
Cloud, including automatic Daylight Savings adjustments.
Your time zone is selected in the Skyport web application.

7
Quick Start - Set Time & Date
Setting the Time
Set Current Time (12:00 AM)
hr +
hr -
min +
min -
Press and
to set the current time.
Press when finished.
Press then to scroll down.
Press
Use AM/PM - ON
Use AM/PM - OFF
For 12 hour AM/PM clock
For 24 hour clock
Choose
Press
when finished.
Set Time & Date
Press
BACK
MENU
BACK

8
Quick Start - Set Time & Date
Setting the Date
Set Current Date
Daylight Savings Setup
6/1/2013
Press
or
to set the current month and year.
when finished.
Press the day on the calendar
27 28 29 30 123
Su Mo Tu We Th Fr Sa
45678910
17161514
13
1211
18 19 20 21 22 23 24
31302928272625
1234567
Press
Press
Daylight Savings Time - OFF
Daylight Savings Time - ON
Start Schedule
Starts On
Day
Month
Stop Schedule
(2nd)
(Sun)
(March)
Ends On
Day
Month
(1st)
(Sun)
(November)
Tu rn Daylight Savings
Time on or off.
Adjust when Daylight
Savings Time begins.
Adjust when Daylight
Savings Time ends.
after making a change
to a selection.
Press
or the Home button
when finished.
Press
BACK
BACK
BACK

9
Connect to Wi-Fi (from initial start up)
When power is connected to the thermostat and it has not been
configured to connect to a Wi-Fi Access point, the following
message appears:
Wi-Fi Set Up
No Wi-Fi access points are
configured for your thermostat.
Would you like to set up one now?
YES NO
YES Press YES
Quick Start - Connect to Wi-Fi
Select the access point you wish to connect to from the list.
Enter the password for the Wi-Fi Access Point and press NEXT.
Select automatic setup and press NEXT.
When finished, a dialog box will appear confirming the successful
connection to the local Wi-Fi Access Point.
Select OK, then the Wi-Fi status page will appear. Upon closing
of the Wi-Fi status page, you will be asked to join the thermostat
to a Skyport account.
Select YES and follow the onscreen instructions to create a new
Skyport account or to add the thermostat to an existing account.

10
Quick Start - Connect to Wi-Fi (from menus)
72
MENU
72
Press MENU
Press DOWN
Press Wi-Fi Setup
Select the access point from the list that you want to
connect to.
Enter the password for the Wi-Fi Access Point and press NEXT.
Select automatic setup and press NEXT.
When finished, a dialog box will appear confirming the successful
connection to the local Wi-Fi Access Point.
Select OK, then the Wi-Fi status page will appear. Upon closing
of the Wi-Fi status page, you will be asked to join the thermostat
to a Skyport account.
Select YES and follow the onscreen instructions to create a new
Skyport account or to add the thermostat to an existing account.
• Wi Fi Setup
Press Wi-Fi

11
• Skyport Account
Quick Start - Connect to Wi-Fi (from menus)
Create Account Now
4
Although there is more than one way to create a Skyport account, the
steps below illustrate creation from a browser.
If the thermostat is connected to the local Wi-Fi Access Point, but not
yet joined to a Skyport account, you may join the thermostat to an
account by doing the following:
Select MENU from the thermostat’s home screen.
Scroll down
Select Skyport
Select Skyport Account and follow the onscreen instructions.
1. Open your browser to: https://Daikin.skyportcloud.com
2. Select “Create account now”
3. Follow on screen instructions to create an account and add a
thermostat to the Skyport account.

12
Main Menu Buttons - Schedule
Schedule
Unoccupied Settings
View My Schedule
Edit My Schedule
Mode
Off
Auto
Heat
(Auto)
Cool
Heat Setpoint (55˚)
Cool Setpoint (85˚)