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.

3
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

9
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.

10
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.