Trane TZONE940AC52Z Troubleshooting guide

TZONE940AC52Z
Communicating
Sensor
with
Display
Indoor Temperature
Cooling Heating
Heat to:
Humidity
Home
Screen
Clean
Zone
Auto
Hold
Outdoor Fan
Auto
SleepAway
Following Schedule
PM
Table of Contents
Overview............. 2
Operation............ 3
Installation ........ 11
User &
Installation
Guide
Scan to see
installation and
help videos for
the 940 Sensor.

2
Section 1. General Information
1.1 Overview
This sensor is a wall mounted low voltage
control that allows a user to control the
temperature in the respective zone.
The sensor can be used in two different
ways:
• Stand-alone remote indoor temperature
and relative humidity sensor.
• Temperature and relative humidity*
sensor used to control individual zones
in zoning applications.
* For zoning applications, relative humidity control
is a system-level function. The 950 Control allows
the user to select the humidity-controlling zone.
*NOTE: For proper operation, some features of the
940 Sensor require software version 2.2 or later
on the 950 Control. Before proceeding, please be
sure the 950 Control is running software version
2.2 or later.

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Indoor Temperature
Cooling Heating
Heat to:
Humidity
Home
Screen
Clean
Zone
Auto
Hold
Outdoor Fan
Auto
SleepAway
Following Schedule
PM
2.1 Buttons and Indicators
Section 2. Operation
System Status
Notification
Icons
Displays Outdoor
Temperature or
Humidity if available.
Touch to alternate.
Maintains the
current setpoints
permanently or until
a chosen time.
When touched, the
unit ignores input for
30 seconds so the
screen can be wiped
with a damp cloth.
Selecting Cooling or
Heating shows the
setpoint and allows
manual temperature
adjustment.
The desired
temperature the system
is targeting. Set
manually or by preset.
Setpoints/Adjustments
Outdoor Sensor
Hold Clean Screen
Display Selection
Setpoints
Current
Time
(from 950 Control)
Room
Temperature
Indoor
Relative
Humidity
1
2
54
3
One-touch buttons
allow quick access to
preset values.
Presets
The fan mode can
be set to Auto or On.
Fan Mode
The mode can be
set to Auto, Cool,
Heat or Off.
Zone Mode

4
1 Icons
Alert Triangle – A critical alert has been detected. Contact servicing dealer.
Signal Icon – The communicating sensor has lost communication. Contact servicing dealer.
Lock Icon – Indicates the screen has been locked by the 950 Control. When this lock is
present, the sensor will not respond to any keypad presses.
IMPORTANT: Do not use household cleaners or spray cleaners, including water spray
to clean the 940 zone sensor screen or enclosure. Household cleaners and sprays may
cause permanent damage to the zone sensor.

5
2 Setpoints - The setpoint is the desired temperature for each mode
(Heating or Cooling).
Select the heating or cooling button to adjust the temperature for that mode. Using the red or blue
arrow, adjust the temperature up or down.
If scheduling is enabled on the 950 Control, changing the setpoint on the 940 Sensor overrides the
scheduled setpoint until the next scheduled period. See the Hold section for additional information.
3 Presets - Three presets allow one-touch control of conditions.
Note: buttons will not be present if disabled from the 950 Control. (See Section 2.2)
These preset buttons on the 940 Sensor are configured from the 950 Control and allow one-touch
convenience for the common situations of Home, Away or Sleep.
These preset values are temporary and will revert to the 950 Control’s scheduled settings at its next
scheduled period.

6
5 Hold - This sensor offers three variations of Hold functionality that override the scheduled
setpoints.
Temporary Hold
Permanent Hold
Hold Until
NOTE: The Hold button is only visible when a schedule is enabled on the 950 Control.
Press Cancel Hold to resume schedule.
4 Fan Mode - Fan Mode is a system-level function. Changing the fan mode at any sensor will
change the system fan mode to reflect the last fan setting.

7
Permanent Hold - This feature is used to permanently override
the scheduled setpoints. Settings will persist until hold is canceled at
either the 940 Sensor or the 950 Control.
1) Press Hold - Press Hold one time to enter Permanent Hold mode.
This zone’s schedule will be overridden and PERMANENT HOLD
appears on the display.
2) Adjust Setpoint - Adjust the setpoint to the desired setting. To
cancel, press Cancel Hold.
PM
Indoor Temperature Cooling Heating
Heat to:
Humidity
Home
Screen
Clean
Zone
Auto
Hold
Cancel
Outdoor
Hold
Fan
Auto
SleepAway
Permanent Hold
1
2
Temporary Hold - This feature temporarily overrides the
scheduled setpoints until the next scheduled period.
1) Adjust Setpoint - Adjust the setpoint to the desired setting by
pressing the up and down arrows. After approximately 5 seconds, the
screen will display Holding Until with the time of the next scheduled
period. To cancel, press Cancel Hold.
Indoor Temperature Cooling Heating
Heat to:
Humidity
Home
Screen
Clean
Zone
Hold
Cancel
Outdoor
Hold
Fan
Auto
SleepAway
PM
Holding Until:
Heat
1

8
Normal
Operation
When a 940
Sensor is fol-
lowing a sched-
ule, the screen
will appear in
this manner.
Indoor Temperature Cooling Heating
Heat to:
Humidity
Home
Screen
Clean
Zone
Heat
Hold
Outdoor Fan
Auto
SleepAway
Following Schedule
PM
Hold Until - This feature overrides the scheduled setpoint until a user selected time is reached.
1) Press Hold Two Times - Press Hold two times to enter Hold Until
mode.
2) Adjust Setpoint - Adjust the setpoint to the desired setting.
3) Set End Time - Set the time to return to the scheduled setpoints.
The screen will show Holding Until with the selected time. To cancel,
press Cancel Hold.
Indoor Temperature Cooling Heating
Heat to:
Humidity
Home
Screen
Clean
Zone
Hold
Cancel
Outdoor
Hold
Fan
Auto
SleepAway
PM
Holding Until:
Heat
1
3
2

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2.2 940 Sensor’s Screen Layout
The screen layout of the 940 Sensor can be
customized through the 950 Control.
MENU > SETTINGS >
SCREEN SETTINGS > ZONE SENSOR
Select the desired display settings. These
settings will update on the 940 Communicating
Sensor after selecting APPLY.

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NOTE: If a zone without a 940 Communicating
Sensor is currently displayed, the following screen
will appear. Please note the zone in the top left.
Press either of the green arrows to switch to the
appropriate zone.

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Section 3. Installation
3.1 Contents and Specifications
The following parts are included in product
model TZONE940AC52Z:
1 - Communicating Sensor
1 - Base
2 - Mounting screws/anchors
1 - Installation/User’s Guide
Specification Description
Product Model: ZONE940AC52Z
Product: ComfortLink II™ Communicating Sensor
Size: 5.5” width x 3.4” height x 1.1” depth
Storage Temperature: -40°F to 170°F, 0% - 95% RH
Operating Temperature: 32°F - 120°F, 5% - 90% RH non-condensing
Power: 24 VAC from HVAC System (Range: 18-32 VAC)
Power Consumption: 2 VA
Wire usage: Minimum 18 gauge NEC approved control wiring
Scan to see a
video on installing
and setting up the
940 Zone Sensor.

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3.2 Zone Sensor Location Considerations
The 940 Communicating
Sensor is designed for instal-
lation in climate controlled
living spaces.
It is recommended to place
the sensor in central loca-
tions with good circulation.
Avoid exterior walls and
areas too near windows,
doors, vents or concealed
pipes or chimneys.
Important: If an air source
is directed at or above the
sensor, heat from the screen
can be trapped within the
sensor body and can cause
the indoor temperature to be
biased.
5 FEET
Optimum
Zone
2 FEET

13
Be sure wires are routed through the center
of the base plate and are long enough to
connect to terminals.
For convenience multiple hole patterns are
provided. Select and mark two opposing
holes. A level may be used to ensure ac-
curacy.
3.3 Physical Mounting
Remove cover by grasping at edges and
gently pulling the cover straight towards
you. It should release without much effort.
D
R
B

14
Attach base to wall using 2 screws
provided. Do not overtighten.
Mounting to studs:
Drill 1/8” pilot holes in the 2 locations
marked above.
OR
Mounting to drywall:
Drill 3/16” pilot holes for anchors (included
with the control) in the 2 locations marked
above.
Gently tap anchors into the holes.
1/8” for screws
into studs
3/16” for drywall
anchors
DRILL HOLES
D
R
B

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Connect power leads to the D, R and B
terminals.
• Wire data to D.
• Wire 24 VAC hot to R.
• Wire common to B.
NOTE: All wall penetrations MUST be
sealed to prevent temperature biasing.
CAUTION: EQUIPMENT DAMAGE HAZARD - Improper wiring
can lead to equipment damage. Follow the terminal connection
information carefully to ensure the control is wired properly. Af-
ter wires are secure, bare wires MUST NOT touch each other.
See the Field Wiring Diagrams for specific system applications.
▲
CAUTION
!
▲
WARNING
!
This information is intended for use by individuals possessing
adequate backgrounds of electrical and mechanical experi-
ence. Any attempt to repair a central air conditioning product
may result in personal injury and/or property damage. The
manufacture or seller cannot be responsible for the interpre-
tation of this information, nor can it assume any liability in
connection with its use.
▲
WARNING
!
LIVE ELECTRICAL COMPONENTS! - During installation,
testing, servicing, and troubleshooting of this product, it may
be necessary to work with live electrical components. Failure
to follow all electrical safety precautions when exposed to live
electrical components could result in death or serious injury.
3.4 Wiring
D
R
B
Seal
Hole

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Indoor Temperature
Screen
Clean
Done
Cancel
Hold
Setup Number
System Zone
Setting
1
2
3
3.5 Setting Zone Address
Setting up the 940 Sensor is a two-step process.
BOTH steps MUST be performed.
STEP 1 – Setting the 940 Sensor’s address:
1. Verify that the Setup Number is “1” and if not
adjust it using red/blue arrows.
2. Select SYSTEM ZONE address by adjusting
with black arrows. SETTING display will not
adjust until setting is accepted below.
3. Pressing DONE saves changes and exits the
setup screen.
At initial power-up, the 940 Sensor Setup
Screen (shown above) will automatically
appear.
To re-enter the setup screen, press and hold
INDOOR TEMPERATURE for approximately
five seconds.

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STEP 2 – Assigning the 940 Sensor to the
corresponding damper in the 950 Control.
1. From the 950 Control verify that is run-
ning software version 2.2 or later. If not,
a software upgrade is required before the
950 will recognize 940 Sensors.
2. Navigate to:
MENU > SERVICE > TECHNICIAN ACCESS >
PROCEED > ZONE SENSORS.
3. Select the corresponding damper on the
left side of the screen.
4. Select the appropriate sensor on the right
side of the screen
5. Press ASSIGN.
Repeat these steps for all communicating
sensors. See the Zone Panel literature for more
information.
1 2
3
Scan to see a
video on how to
set up zoning with
the 940 Sensor.

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3.6 Changing the Zone Assignment
Important: Once the 940 Sensor’s address has been selected and the sensor has been associated
to a zone in the 950 Control, changing the address at the 940 Sensor will have no effect on the zone
assignment. To change zone assignment, see below.
If the 940 Sensor’s address has been set and assigned to a zone in the 950 Control, use the following
steps to change the 940 Sensor’s assignment.
1. Change the 940 Sensor’s address.
2. On the 950 Control, navigate to:
MENU > SERVICE > TECHNICIAN ACCESS >
PROCEED > ZONE SENSORS
3. Select the appropriate zone.
4. Select the UNASSIGN button.
5. Select the new zone.
6. Select the sensor.
7. Press the ASSIGN button.
NOTE: If you need to re-enter this setup screen, press and
hold INDOOR TEMPERATURE for approximately 5 seconds.

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940 Sensor Setup Table
Data Setup
Number
Setting
Range
Default
Setting
ONLY for Installers Zone Address 1 1-8 1
User Settings
Active Brightness 2 0-10 10
Standby Brightness 3 0-10 0
Backlight Timeout 4 5-60 (sec) 10
Clean Screen Timeout 5 5-60 (sec) 30
3.7 Optional User Display Settings
The setup screen allows changing of display settings. These features can be adjusted by changing the
SETUP NUMBER and changing the SETTING range in the same manner as the Zone Address was set
in the previous section. Please see the matrix below.
NOTE: To enter this setup screen, press and hold INDOOR TEMPERATURE for approximately 5
seconds.

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3.8 Troubleshooting
Troubleshooting Issues
Icon Condition 950 Control Displays Solution
Alert
Icon
Indoor temperature sensor
has failed/stopped reporting
An associated SOP.004.00 will
be displayed on the 950 control
Use the 950 Diagnostic
screen to troubleshoot alert
Indoor humidity sensor has
failed/stopped reporting
An associated SOP.004.03 will
be displayed on the 950 control
Use the 950 Diagnostic
screen to troubleshoot alert
One of the keypad segments
is stuck NA Replace the sensor
Signal
Icon
Hidden NA Normal Operation
Solid NA Sensor has not been
discovered by 950 control
Flashing After 2 minutes, SOP.004.00 will
be displayed on the 950 control
Indicates a loss of
communications
Lock
Icon Indicates the screen has been locked by the 950 control. When this lock is present, the sensor will
not respond to any keypad presses.
NA No display After 2 minutes, SOP.004.00 will
be displayed on the 950 control
24VAC Power is lost on the
940 Sensor