Residential Control Systems TXB16 User manual

Model TXB16
X10PowerlineCommunicatingThermostat
INSTALLATIONANDOPERATIONMANUAL
Rev PControl Unit
DCN: 141-00940 Rev 09
11/02/07
Applies to the following product revisions or later:
Product Part No
TXB16 Thermostat Kit 001-00940-17
TS16 Wall Display Unit 001-00910-13
HFRU HVAC Control Unit (Rev P)001-01432-01
*** IMPORTANT NOTICE ***
DO NOT USE THIS PRODUCT FOR BUILDING FREEZE PROTECTION! YOU ARE ADVISED TO
INSTALL A MECHANICAL FREEZE PROTECTION DEVICE FOR THIS PURPOSE.
RCS ResidentialControlSystemsInc.

DCN: 141-00940-09 11/02/072
TXB16OPERATION
The TXB16 thermostat provides the latest technology in a full-featured universal thermostat with X10
Power Line communications. The TXB16 has many new features including:
•Separate Heating and Cooling Setpoints
•Multistage HVAC Systems Support
•Setup Mode from the Wall Display Unit
•Automatic Remote Sensor Detection
•Status LED X10 Signal Indication
•Selectable X10 Decode Table
•Bi-directional X10 Standard
•Enhanced X10 Protocol
The TXB16 thermostat consists of two parts, a TS16 Wall Display Unit (WDU) and a HVAC Control Unit.
The Wall Display Unit provides users functions like a traditional thermostat and connects to the Control Unit
by a 4 wire cable. The Control Unit connects at the HVAC system using the standard thermostat
connections and provides the thermostatic temperature control of the system. The Control Unit also has
the X10 Power Line Interface connection.
The TXB16 now maintains separate heating and cooling setpoints and you can select single or dual
setpoint operation. The display shows the setpoint of the current system mode (Heat or Cool). In the Off or
Auto mode, the system keeps track of the current operating mode of the last call, either heating or cooling.
Single setpoint commands are still used to send and request setpoint information. When a new
setpoint is sent to the TXB16, it will automatically convert that setpoint into a heating or cooling setpoint
based on the current operating mode of the stat. This allows compatibility with single setpoint systems.
When Autosend in enabled, it will report a setpoint change as either a heating or a cooling setpoint with
new X10 Bi-directional messages.
In addition to the universal Standard or Heat Pump HVAC system type support, the TXB16 supports
multistage heating/cooling system outputs. The control unit can support 2 stages of heating and cooling for
Standard systems, or 3 stages of heating and 2 stages of cooling for Heat Pump systems.
The TXB16 has a convenient setup mode from the Wall Display Unit. You can set the X10 House code
address, the F or C temperature mode and easily calibrate the internal and remote sensors.
The TXB16 has automatic detection and setup of remote temperature sensors. Remotes sensors have 3
address settings that, when detected by the TXB16, will be used for specific functions such as in lieu of the
internal sensor, averaging with other sensors or an outdoor sensor.
The Status LED shows X10 signal traffic, which can be helpful in trouble shooting system installation
problems. The Status LED flashes slowly to indicate system OK. When an X10 command is received,
normally the Status LED will blink fast 2 times. If the command is addressed for this thermostat, the LED
will flash fast 4 times. X10 transmissions will also flash the LED.
The TXB16 supports all of the RCS X10 Unit Code and Bi-directional protocols.
The TXB16 supports the RCS Unit Code “B”, “P” and “L” decode tables as well as the bi-directional ”Preset
Dim” table. The default X10 Unit Code decode table, B or P, can be set to allow compatibility with existing
TX15/TX15-B thermostats and control software. Changes in decode table selection by using “All lights On”
or “All Units Off” commands or Preset Dim Commands are now stored in permanent memory.
Remote control of the TXB16 via the robust X10 Bi-directional communications protocol allows for the
thermostat’s temperature, heating and cooling setpoints, operating mode and fan functions to be monitored
or changed.
Many new commands have been added to support the TXB16’s new features. Refer to the X10 protocol
document, DCN 150-00200.

DCN: 141-00940-09 11/02/073
TS16 WallDisplayUnit
The TS16 Wall Display Unit has a LCD display and control buttons for changing the setpoint, system
operating mode and manual fan mode. The WDU also has an internal temperature sensor. The display
serves as a common display for many functions. It normally shows the current room temperature but
switches to show setpoint, mode or other functions when buttons are pushed. Two on-screen indicators
show the state of the manual fan and setback mode.
Any changes, such as the temperature or control button operations at the WDU are sent to the HVAC
Control Unit. In turn, the Control unit can send changes in setpoint or modes up to the WDU. When
updates are received, they are displayed on the LCD for 3 seconds and then the display returns to the
current room temperature.
LCD Display
The LCD display is a two digit multifunction display that normally shows the current room temperature. It
has a continuous backlight for easy viewing anytime. Whenever any of the control buttons are pushed, the
LCD display will change to show that function’s current status. The LCD display will stay in the new display
mode as long as buttons are being pushed. After 3 seconds of no activity, the display will change back to
show current temperature.
The right decimal point on the LCD display will turn on whenever manual fan is ON. The left decimal point
will flash whenever the setback mode is ON.
Remote changes in setpoint or modes that are received from the Control Unit will cause the LCD display to
switch and display the updated data for 3 seconds and then return to current temperature.
Control Buttons
The UP and DOWN buttons control the setpoint temperature. Pushing the UP or DOWN button once will
cause the LCD display to change to show the current setpoint temperature (but won’t change it). Pushing
the button again, before the display switches back to current room temperature, will decrement or
increment the setpoint value by one degree. Pushing and holding a button down will cause the setpoint to
continuously ramp up/down until the button is released. After 3 seconds of no activity, the LCD display will
change back to show the current room temperature and the new setpoint value will be sent to the Control
Unit.
The max cooling setpoint is 110 deg F (43 deg C). The max heating setpoint is 106 (41 deg C).
Min setpoint is 40 deg F (5 deg C) for heating and 44 deg F (7deg C) for cooling.
.7.5
MODE
FAN
Manual Fan On Indicator
LCD DISPLAY
Shows current temp normally.
Shows setpoint or mode
when buttons pushed.
Setback Mode On Indicator
TS16 WDU
Setpoint Increase Button
Setpoint Decrease Button
System Mode Button
Manual Fan Button
UP –DOWN Buttons

DCN: 141-00940-09 11/02/074
Setpoint Display
The displayed setpoint shows the setpoint of the current operating mode (heating or cooling) of the
system. If you change modes, the setpoint displayed will change to the new operating mode setpoint.
If you set the mode to AUTO mode, the setpoint displayed will be the current operating mode of the
system, either heating or cooling. This will change if the operating mode changes automatically.
MODE
The MODE button controls the HVAC system mode. To see what mode the system is in, push the MODE
button once and the LCD display will change to show the current mode (but won’t change it). Pushing the
MODE button again while the mode is being displayed, will cause the mode and display to change to the
next mode. The system mode cycles from Off to Heat to Cool to Auto (and to EH or emergency heat for
Heat Pump systems) and back to Off again with each push of the MODE button. Any change in the
system mode will be sent to the HVAC Control Unit.
When Heat Pump HVAC system type is selected on the Control Unit, an additional system mode of “EH”,
or Emergency Heat, is included in the TS16 mode selections. EH is used when Heat Pump compressor
failure requires the use of Auxiliary Heat (heat strips) for primary heating. When EH mode is selected, the
display will alternate between current temperature and “EH” to remind you that the EH mode has been
selected. After the compressor repair is completed, return the mode to heating or cooling as needed.
FAN
The FAN button controls the HVAC system’s manual fan mode. Pushing the FAN button once will turn the
fan ON and pushing it again will turn the fan to the AUTO mode (which is OFF unless the fan is
automatically turned ON by the heating or cooling operation ). The decimal point in the middle of the two
digits on the LCD display will come on when the manual fan is ON. Changes in the fan mode will be sent to
the HVAC Control Unit.
The Control Buttons can be used for other functions and in combinations.
•Press and hold the UP/DOWN buttons simultaneously to view the Outside temperature. (If an
outdoor sensor is attached or network outside temperature data is available).
•Press the MODE button and simultaneously press the FAN button to enter the Setup Mode.
•Buttons are used for navigation in other modes.
Temperature Display
The WDU will normally display the current indoor temperature from the internal digital temperature sensor
or a remote sensor with address 1. The sensors have an accuracy of +/-1°F(+/-.5°C) and the range of -
67°F(-55°C) to 257°F(125°C).
The WDU will display temperatures from -9°F/C to 127°F/C. Temperatures less than 0°will be displayed
down to -9 °(temperatures lower than –9 will also be displayed, but without the –sign). Temperatures over
100°will be displayed without the leading 1 (ex: 102 will be displayed as 02°)
Setup Mode
The TXB16 has a new setup mode to allow the user to set the following functions from the WDU:
•X10 House Code Address
•F/C mode
•Sensor Calibration
MODE Button
FAN Button

DCN: 141-00940-09 11/02/075
Entering into the setup mode.
Enter the setup mode by the following procedure:
1. First press and hold the Mode button
2. Simultaneously press the Fan button.
3. The display will change to show “SU”.
4. Release all buttons.
5. The display will change to show the setup menu, starting with “Ad” (Address)
6. Select what setup function you want to change or view by pressing the Mode button to cycle
through the menu options:
“Ad” X10 Address
“FC” Fahrenheit or Celsius mode
“C1” Calibrate Internal Sensor (or Remote Sensor address 1 if attached)
“C2” (if Remote Sensor address 2 attached)
“C4” (if Remote Sensor address 4 attached)
Setting the Address
When you first enter the setup mode, the first menu selection displayed on the LCD display is “Ad”. To
view the current address setting, press the UP or DOWN button once. With the current address displayed,
you can either change the setting or exit by pressing the mode button or wait for the screen to time out. If
you want to change the address, while the current address is being displayed, use the UP/Down buttons to
select the address desired, 1 to 16, corresponding to X10 house codes A to P. (Default set to 1 for HC A)
Setting the Fahrenheit or Celsius mode
In the setup mode, press the mode button to select “FC” mode. Press the UP/DOWN buttons to select F
or C mode desired. To exit press mode again to move another setup mode or wait for the screen to time
out and return to thermostat mode.
Setting the Sensor Calibration
In the setup mode, press the mode button to display the sensor calibration address, “C1”, to be calibrated.
”C1” is the internal sensor and normally that is all that will be available to calibrate unless external remote
sensors are attached. These will show up as “C1”, “C2” and “C4” in the menu selection, if present. With
the desired sensor address displayed, press the UP/DOWN buttons to change the sensor calibration to the
desired temperature. See calibration explanation below.
Exit setup mode
When you are done making changes and no button is pressed for 3 seconds, the display will automatically
exit setup mode and return to the thermostat mode and current temperature display.
Temperature Display Calibration
The TS16 WDU has the capability for the user to adjust the temperature display calibration from the WDU
in the setup mode of the internal sensor as well as all attached remote sensors.
Normally the TS16, with no attached remote sensors, will only show the internal sensor as “C1” in the
calibration setup menu. The TS16 can have additional remote sensors attached. These are addressed as
remote sensors 1, 2 (3 is not used on theTS16) and 4. If they are detected by the TS16, they will show up
in the calibration menu as additional sensors to calibrate as C2 and C4. Note that if remote sensor with
address 1 is attached it replaces the internal sensor and is becomes the “C1” sensor. See the remote
sensor section for more details.
When the desired sensor is selected in the setup menu, you can adjust its displayed temperature
calibration up or down 7 degrees by pressing the UP/DOWN buttons.
The calibration menu selections are:
C1 = calibrate internal sensor or remote sensor address 1 if attached
C2 = calibrate remote sensor address 2 (only shows up in menu if attached)
C3 = N/A, not used on the TS16

DCN: 141-00940-09 11/02/076
Remote Sensors
The TS16 Wall Display Unit has a remote sensor terminal block, J2, on the base for connection of a
remote temperature sensor. Without any remote sensor attached, the WDU uses the internal sensor for
the current temperature information. When a remote sensor is attached, the WDU will detect it
automatically and will use the remote sensor(s) according to its address selection. Modes of operation are
as follows:
Address 1: Use the remote sensor instead of internal sensor. (becomes C1 in the calibration setup).
Address 2: Average remote sensor 2 with internal sensor or remote sensor 1. (C2 in the calibration setup)
Address 3: Not used with the TS16
Table of Remote Sensor Functions and Sensor Addresses
Function Remote Addr 1 Remote Addr 2 Remote Addr 3
Use internal sensor only No No Not used
Use remote sensor only Yes No with TS16
Average internal and one remote No Yes
Average two remotes (only 2) Yes Yes
When averaging sensors are used, the average temperature is displayed on the WDU and reported to the
HVAC control unit. You cannot view an individual remote averaging sensor temperatures as the main
thermostat display or report individual sensor temperatures on the communication port. However, you can
check the individual sensor temperatures by going to the calibration setup menu and selecting the sensor
address. You can view the outside temperature by pressing both the UP/DOWN buttons simultaneously.
WDU Error Displays
“CF” Error Display
If the WDU is not properly wired or if communications to the Control Unit is interrupted, the LCD display will
display “CF” to denote communications failure. Momentary display of “CF” caused by bad or lost data, will
clear automatically when data communications is restored.
If the “CF” display stays on, check wiring for problems. A continuous “CF” display may indicate a problem
with the Control Unit or the WDU itself.
“SF” Error Display
If the WDU detects that a sensor is not responding, it will display “SF”. In most cases this will clear itself
when communications is restored to the sensor. A continuous “SF” display may indicate a problem with the
wiring or the WDU itself. Check wiring and replace the WDU as needed.
“-- --“ Error Display
This denotes that the temperature is invalid. Can appear if you select outside temperature and no remote
sensor is attached or if an error in temperature is sensed momentarily by the WDU. Clears automatically
when a valid temperature is read.

DCN: 141-00940-09 11/02/077
TXB16HVACControlUnit
The TXB16 HVAC Control Unit works in conjunction with the Wall Display Unit to provide thermostatic
control of the HVAC system. In addition, the Control Unit can receive X10 commands for remote control of
the setpoints, temperatures and modes of the thermostat. The TXB16 X10 bi-directional protocol also
allows the unit to transmit information via the pre-set dim commands.
The TXB16 Control Unit connects to the HVAC system the same as, and in place of, a standard
thermostat. It is usually mounted near the HVAC system, although it can be mounted anywhere
convenient. It is connected to the WDU by a 4 wire cable, either standard thermostat wiring or typically Cat
3/5 in new construction.
Actual thermostatic control of the HVAC system is provided by the Control Unit. Changes in the current
temperature, setpoint, system or fan modes are sent to the Control Unit either from the WDU or via X10
commands. The Control Unit monitors this information and operates the HVAC system accordingly.
HVAC System Compatibility
The TXB16 works with almost all heating and cooling systems, including standard Gas/Electric, Heat
Pump, Radiant, or Hydronic systems and with single or multi-stage systems. Compatible with single or
separate transformer heating/cooling systems.
System Type Heating Stages Cooling Stages Notes
Gas 22Single or split transformer
Electric 22Selectable Fan with Heat
Heat Pump 32Selectable Changeover with Heat or Cool
Radiant 22
Hydronic 22Pump output
STANDARD GAS/ELECTRIC HVAC SYSTEMS OPERATION
The TXB16 has Standard HVAC system operating modes of Heating, Cooling and Auto changeover.
In the HEAT mode, the stage 1 heating will be turned on at one degree below the heating setpoint and will
turn off at the setpoint. In the COOL mode, the stage 1 cooling will be turned on at one degree above the
cooling setpoint and will turn off at the setpoint. This is referred to as the setpoint Delta T (temp) mode of
operation.
Second stage heating/cooling deltas are factory set at 3 degrees. This means that second stage will come
on when the delta from setpoint reaches 3 degrees. Second stage heating/cooling calls will stay on until
the first stage setpoint is satisfied.
In the AUTO mode, the system will maintain the heating or cooling setpoints and switch automatically from
heating mode to cooling mode as needed. There is a deadband between heating and cooling setpoints
that keeps the two setpoints from overlapping. This is set to 4 degrees.
Setpoint Push. If you adjust the heating setpoint to be less than 4 degrees from the cooling setpoint, the
cooling setpoint will be pushed to maintain the 4 degree deadband separation. Same for adjusting the
cooling setpoint, if you get within the deadband separation, the heating setpoint will be pushed.
Minimum run time (MRT). The HVAC Control Unit has a minimum run time set to 6 minutes. Whenever
a heating or cooling call turns on, the system will run a minimum of 6 minutes even if the call is satisfied
before then. If the system is set to Off mode, the MRT will be canceled and all operation stopped.
Minimum Off Time (MOT). The HVAC Control Unit has a short cycle protection (SCP) delay of 6 minutes
after any compressor operation. This delay prevents a subsequent compressor call until the delay times

DCN: 141-00940-09 11/02/078
out. This delay is to allow the compressor head pressure to bleed off before starting again. In addition, at
the end of every heating or cooling call the MOT is triggered to prevent rapid cycling of the system.
NOTE: The Status LED on the Control Unit circuit board will change to flash twice to indicate the
system is in a MRT or MOT delay period.
Standard HVAC System Setup
Standard System Mode Selection. To set the Control Unit for standard GAS/ELECTRIC operation, set
the dipswitch SW1 position 1 to the STD SYS position (SW1-1 = OFF).
Fan Mode Selection. Normally, GAS heating systems DO NOT require fan calls along with the heat call
due to automatic fan operation in the furnace. For Gas systems, dipswitch SW1 position 2 should be set to
the STD FAN position (SW1-2 = OFF).
Electric and hydronic heating systems generally DO require that a fan call be generated along with the heat
call. For these systems, dipswitch SW1 position 2 should be set to the FAN/HEAT position (SW1-2 = ON).
Be sure to check your HVAC system’s requirements.
Note: Dipswitch SW1 position 3, the CO selection is not required for standard systems. Leave in the Off
position (SW1-3 = OFF)
TXB16 Control Unit HVAC System Outputs for Standard Systems
Operating Mode Outputs (no Fan with Heat) Outputs ( Fan with Heat)
Manual Fan GG
Heating Stage 1 W1 W1, G
Heating Stage 2 W1, W2 W1, W2, G
Cooling Stage 1 Y1, G Y1, G
Cooling Stage 2 Y1, Y2, G Y1, Y2, G

DCN: 141-00940-09 11/02/079
HEAT PUMP HVAC SYSTEM OPERATION
The TXB16 has Heat Pump operating modes of Heating, Cooling, Auto changeover and Emergency Heat.
The Heat Pump HVAC system operation is the same as for Standard systems for normal first and second
stage operations. In addition, Heat Pumps may have a third stage of heating, which is for heat strips. The
third stage comes at 5 degrees from setpoint and stays on until the stage 1 setpoint is satisfied.
Emergency Heat Mode. When the Control Unit is selected as a Heat Pump system, there is an
Emergency Heat Mode that can be selected from the WDU mode menu. In the event of a compressor
failure, the “EH” mode can be selected. When in this mode, the heat strips (W1 output) will be used for
stage one heat calls. This mode is for temporary use until the compressor can be repaired.
Heat Pump systems have the same Minimum Run Time and Short Cycle Protection /Minimum Off Time
delays as Standard systems.
Heat Pump systems have a different HVAC system setup, which is described below.
Heat Pump HVAC System Setup
Heat Pump Mode Selection. For Heat Pump operation, set SW1-1 to the HP SYS position (ON).
Fan Mode Selection. Set the Fan selection, SW1-2, to the STD FAN position (OFF).
Change Over Selection. Heat pump systems change from heating to cooling by reversing the direction of
Freon flow in the system. This change over is controlled by the CHANGEOVER (CO) output from the
Control Unit (sometimes this is referred to as the reversing valve).
Most heat pump systems are designed to work normally in the heating mode and require a change over
output for cooling. Set dipswitch SW1 position 3 to the CO/CL position (SW1-3 = OFF) for this type
system. Check your HVAC system requirements for correct settings.
If your system requires changeover with heating, set SW1 position 3 to the CO/HT position (SW1-3 = ON).
Changeover Relay Operation: The changeover relay output stays ON after a heating/cooling call for the
duration of the minimum off delay period. If another call occurs before the delay period expires, the CO
relay will already be on and this avoids continuously cycling the CO valve on/off for each call.
TXB16 Control Unit HVAC System Outputs for Heat Pump Systems
Operating Mode Changeover with Cool Changeover with Heat
Manual Fan GG
Heating Stage 1 Y1, G Y1, G, O
Heating Stage 1 + 2 Y1, Y2, G Y1, Y2, G, O
Heating Stage 1 + 2 + 3 Y1, Y2, G, W1 Y1, Y2, G, O, W1
Cooling Stage 1 Y1, G, O Y1, G
Cooling Stage 1 + 2 Y1, Y2, G, O Y1, Y2, G
Emergency Heat W1, G W1, G

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ControlUnitStatusLEDs
The Control Unit has LEDs on the circuit board to show system status and relay output states. When
the relay output LED’s are on, the relay is on.
Relay Output LEDs
LED Function Control Unit Output
H1 Heat stage 1 output (Heat stage 3 for HP systems) W1
Fan Fan output G
C1 Compressor stage 1 output Y1
CO* Heat stage 2 output for Standard HVAC systems
Changeover valve output for Heat Pump HVAC systems W2 O
C2 Compressor stage 2 output Y2
* The CO output is set by the system type switch (SW1) setting. When set to Standard systems the output
becomes Heating Stage 2 (W2). When set to Heat Pump setting the output becomes the Changeover
(reversing) valve output (O).
System Status LED
The Control Unit has a Status LED on the circuit board that will normally flash on and off slowly as a
system heartbeat. The System Status LED can also show MRT/MOT states and X10 Communications.
Status LED MRT/MOT Indication
During the Minimum Run Time (MRT) period (default 6 minutes) after the beginning of a heating or cooling
call and during the Minimum Off Time (MOT) period after a call ends (also default 6 minutes), the system
status LED will flash twice slowly for each heartbeat. During the MOT period the compressor outputs are
locked out to provide short cycle protection.
Status LED X10 Signal Reception or Transmission Indication
When the TXB16 is first powered up, the status LED will come ON steady, indicating power and the unit is
running OK. When the X10 power line interface is connected and an X10 signal is detected, the LED will
start flashing slowly as the normal system heartbeat.
If the X10 signal is lost, the LED will stop flashing and be ON steady. If this occurs, check the following:
1. Check that the X10 Power Line Interface module is powered and its LED is on. If not check the
110VAC circuit to be sure it is not switched off.
2. Check that the modular cable is plugged in securely on the X10 PLI and the TX16B
3. Verify that the correct “reversing” type modular cable is installed if not the factory cable or it has
been changed before the problem occurred.
4. Replace module or cable as needed to restore X10 communications.
Any X10 Command Received. When the control unit receives any valid X10 Command, the Status LED
will flash twice rapidly. Note that the LED on the X10 PLI module will also flash when X10 commands are
detected.
X10 Command With Correct House Code Received. If the X10 command received is also addressed
with the same house code as theTXB16 control unit, the status LED will flash 4 times rapidly. This is a
command for the TXB16!
X10 Command Transmitted. When the TXB16 responds to a request for status or is set to AUTOSEND
mode, it will transmit X10 commands for temperatures, setpoints and modes. Whenever a X10 command
is transmitted by the control unit, the Status LED will flash 4 times rapidly.

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X10OPERATION
X10 Power Line Interface
The TXB16 Control Unit has an X10 powerline carrier interface that allows X10 commands to be received
and transmitted over the 110 VAC powerline. Commands from remote systems can change the setpoint
temperature and mode of the thermostat. The Control Unit connects to the power line by an external X10
Powerline Interface Module. X10 commands received by the Control Unit are decoded to a new setpoint or
a new mode and are sent to the WDU to update its display. When X10 commands are received, the WDU
will switch it’s display to show the updated information for three seconds and then return to the current
temp display.
The thermostat has an X10 address called a House Code. There are 16 X10 House Codes referred to as
the letters A to P.
X10 House Code Setting
New with the TXB16, the X10 House Code address, is now set from the Wall Display Unit. (If your unit
includes X10 address dipswitch SW1, with positions 5, 6, 7 and 8, ignore them as they are no longer
used for address selection. Set the desired house code by the following table. The unit comes with the
X10 address set to 1 for House Code A.
To set the X10 House Code, enter the Setup Mode on the WDU by pressing the Mode button and the Fan
button simultaneously. “SU” will be displayed on the WDU LCD display to indicate you are in the Setup
Mode. Press the Mode button again to select “Ad” for X10 Address setting. Use the Up/Down buttons to
select the desired X10 house code using the table below. When done wait for the setup screen to timeout
and return to the current temperature display.
X10 Command Decode Tables
The X10 communications protocol was originally designed to turn lights on and off or dim them. The
TXB16 thermostats responds to X10 commands by decoding them into commands to change thermostat
setpoints and modes. As such, there are two types of X10 commands that the TXB16 will respond to: the
more simple Unit Code commands (32 commands), such as “A1 ON” or “A1 OFF” which are receive
only commands; and the more robust Preset Dim commands (512 commands), such as “A4 Preset Level
6%” which are bi-directional (received and transmitted by the TXB16).
WDU Address X10 House Code
1A
2B
3C
4D
5E
6F
7G
8H
9I
10 J
11 K
12 L
13 M
14 N
15 O
16 P
X10 House Code Address Setting Table

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The specific X10 commands that the TXB16 Control Unit can receive and how they are decoded into
setpoints and modes is defined by a “Decode Table”. The TXB16 includes 3 Unit Code decode tables, B,
P, L and the Preset Dim Bi-Directional decode table. See the X10 Protocol manual #150-00200 for further
information.
Unit Code Decode Tables
Unit Code Decode tables us the simple direct X10 commands sent by devices like the X10 mini or maxi
controller, most all home automations systems and many security systems. They consist of messages with
a House Code and Unit Code command sequences of House Code/Unit Code/Command such as A 1 ON
(A= house code, 1 = unit code, On=command).
There are three Unit Code Command Decode Tables available in the TXB16, the P Decode table (default),
the B Decode Table and the L Decode Table. Each has slightly different decode schemas.
•The P decode table is the primary and default table and is the same as used by the TXB16
thermostat.
•Non bi-directional TX15s used the B decode table.
•The L table is a special limited ON/OFF/SETBACK decode table for use with security systems that
can have only one X10 House code and that must be shared with lighting and the thermostat.
Setting the Default Unit Code Decode Table.
The TXB16 is default set to the P decode table. You can set/change the decode table used by the TXB16
three ways.
1. Dipswitch SW1 position S4. Forced B Decode Table. Setting S4 to ON will force the B decode
table to be active. Use this for compatibility with older TX15 thermostats. When S4 is ON, no
other decode table selection is allowed and will be overridden. When set to OFF, ALO/AUO
and preset dim commands are allowed.
2. Use the Unit Code All Lights On (ALO) or All Units Off (AUO) commands. ALO will set the unit
code decode table to “B” and AUO will set the decode table to “P”. These changes are stored in
EEProm memory and will not be lost by a power cycle.
3. Use the Preset Dim commands to select the decode table.
a. Unit code 4, preset level 90% will set the decode table to “P”
b. Unit code 4, preset level 94% will set the decode table to “B”
c. Unit code 4, preset level 97% will set the decode table to “L”
These changes are also stored in EEProm memory and will not be lost by a power cycle.
Unit Code and Preset Dim Command Control
Unless otherwise turned off by preset dim commands, both Unit Code and Preset Dim commands can be
used simultaneously. Unit Code commands can be inhibited by a preset dim command (Unit 4 55%).
Preset Dim commands can also be inhibited by a Preset Dim command (Unit 4 61%). Note that the Preset
Dim Command “Preset ON” (Unit 4 58%) command is always enabled.
Other Preset Dim Control Commands
The Preset Dim command set contains many other control options. Refer to the X10 protocol manual for
details on these commands.
**** RESTORE DEFAULTS COMMAND ****
In the event that you have sent commands that cause the thermostat to no longer respond to X10
commands or locks up, you can restore default settings and operations by sending the following unit
code sequence:
P4 ON, L3 OFF, H2 ON, D1 OFF
NEW!

DCN: 141-00940-09 11/02/0713
TXB16 Installation
Before proceeding with removing an existing thermostat and installing the TXB16,
Read the following important steps.
1. Record existing wiring information on the enclosed wiring form.
2. Perform the TXB16 bench test
3. Check WDU wiring BEFORE applying power to control unit.
4. Be sure to install a freeze protection device as required.
Installation Overview
Standard thermostat wiring vs TXB16 in retrofit applications.
Heating &
Cooling
System
4, 5 or 6 wires
18Ga thermostat wiring
4 Wires
TXB16
Control
Unit
Heating &
Cooling
System
TS16
Wall Display Unit
Thermostat
Replace
Thermostat with
Wall Display Unit
Insert Control Unit into
the thermostat wiring
4,5 or 6 wires
as original
installation
OLD
NEW
STOP
Freeze Protection.
In cold climates that require the heating system to be used for building freeze protection, a mechanical
backup freeze protection device MUST be installed on the heating system. This can be a simple
mechanical heating thermostat or a preset thermoswitch installed in the heated area.
Heating
System
Red Wire 24VAC R
White Wire Heat W
40-45°R
W
Thermostat connections
Wire across Heater R/W terminals.
Mechanical
Thermostat or
Thermoswitch

DCN: 141-00940-09 11/02/0714
TXB16WallDisplayUnitInstallation
WDU Location Choose a location that best represents the temperature of the area to be controlled. Avoid
locations that are subject to drafts, from doors and windows, or areas with direct sunlight exposure.
WDU Mounting Route the wires to the WDU through the access hole in the back of the case. Mount the
WDU to the wall with the screws and anchors provided. Be sure to plug any large access hole in the wall
with sealer or insulation to prevent wall drafts from affecting WDU operation.
WDU Pre-wiring The recommended wiring to the WDU from the Control Unit should be a two twisted pair
cable, 24 GA minimum. Cat 3 or 5, 4 pair cabling is acceptable. In retrofit applications the existing
thermostat wiring (a least 4 wires) may be adequate. However, such non-twisted wiring may be subject to
interference due to noise from adjacent wiring or other sources.
Wiring to the Wall Display Unit
Remote Sensor Wiring
The TS16 WDU has an addition connector, J2, on the WDU base for connection of an external remote
temperature sensor. Follow the wiring diagram with the remote sensor to connect to the WDU.
G
+12
C
D
1 POWER GND
2 POWER +
3 COM CLOCK
4 COM DATA
WIRING
ACCESS
HOLE
J1
WDU WIRING DIAGRAM
TS16 WDU
BASE
Hook TOP here
and rotate into
base. Be sure
pins engage in
connector ok.
TO CLOSE
OPENING AND CLOSING THE WDU CASE
TO OPEN
PULL FROM LOWER CORNERS
OPEN
CLOSE
BASE
For Remote Sensor
G
+5
C
D
J2
TXB16 CONTROL UNIT
GND G
+12VDC +V
CLOCK C
DATA D
TWISTED PAIR 22 GA WIRE RECOMMENDED
TXB16 WALL DISPLAY UNIT
WDU
+12V
GND
DATA
CLK
J1
** CAUTION **
DO NOT MISWIRE
WDU
CONNECTIONS OR
DAMAGE MAY
RESULT

DCN: 141-00940-09 11/02/0715
TXB16ControlUnitInstallation
Location and Mounting
Install the TXB16 Control Unit in a protected, convenient, INDOOR location near the HVAC system or in a
service accessible area such as an equipment closet or garage.
Mount the Control Unit in a vertical position on a wall or sturdy structural member. The unit may be
mounted on the HVAC system but care should be taken to avoid the hot burner section or high vibration
areas.
Control unit wiring
The TXB16 HVAC Control Unit is connected to the HVAC system and to the Wall Display Unit as well as
the X10 communication interface and power connections.
Control Unit to WDU wiring
ControlUnittoHVACSystemwiring
Electrically, the Control Unit looks like a standard thermostat to your HVAC system. All connections to the
HVAC system are made at the normal thermostat connections on the HVAC unit.
Control Unit Setup. You are advised to refer to your HVAC system’s documentation for specific
information on its thermostat connections and setup requirements. You must know the following:
1. HVAC system type: Gas, Electric or Heat Pump
2. Fan requirement:
a. No fan with Heat (Gas heat)
b. Fan with Heat (Electric heat)
3. For Heat Pump systems: Changeover valve type:
a. Change over with cool (O thermostat connection)
b. Changeover with heat. (B thermostat connection)
Note on retrofit wiring. You may note (and be sure to note on the wiring form) that you have additional
wires when you disconnect your old thermostat. Usually these wires are for auxiliary functions such as filter
or trouble indicators. For Heat Pump systems there may be emergency heat (EH) wiring or both O and B
changeover connections. These wires are not used in the TXB16 installation and in most cases these
extra wires are not required for normal HVAC system operation.
Refer to the following HVAC wiring diagrams for the type of HVAC system that you have, Standard
Gas/Electric or Heat Pump.
WDU
+12V
GND
DATA
CLK
J1
4 wire connection to Wall Display Unit
Use Thermostat wiring or 22 Ga Twisted pair
(Cat 3/5 wiring OK)
GND G
+12VDC +V
CLOCK C
DATA D
TS16
Control Unit

DCN: 141-00940-09 11/02/0716
HVACSystemWiring-StandardGas/Electric
Diagram 1 -Standard Gas or Electric System Wiring
Standard HVAC System Setup Notes:
Single Stage Systems use W1 for heating stage 1, and Y1 for cooling stage 1.
Two Stage Heating systems use W1 for stage 1 and W2 for stage 2 heating.
Two Stage Cooling systems use Y1 for stage 1 and Y2 for stage 2 cooling.
HVAC System 24VAC Transformer
If you have an integrated heating and cooling system with a single transformer, do NOT cut jumper JP1.
Wire the 24V Return (red) wire to either RH or RC. This is typical of most central systems.
If you have separate heating and cooling systems with separate transformers, cut jumper JP1. Wire the
heating 24V R (red) wire to the control unit’s RH terminal and run the cooling systems 24V R (red) wire to
control unit’s RC terminal. Also wire the cooling systems 24VAC Com to the control units 24VAC Com
terminal.
Standard HVAC System
G Fan
W1 Heat Stage 1
Y1 Comp Stage 1
R 24VAC Return
C 24VAC Common
Red (or RH for split systems)
Green
White
Yellow
24V RC
W1 Heat 1
G Fan
Y1 Comp 1
W2 Heat 2
HVAC SYSTEM
THERMOSTAT CONNECTION
TXB16 HVAC Control Unit
Typical thermostat wiring color codes
Y2 Comp Stage 2
24V RH
IMPORTANT! For typical central heating/cooling systems,
leave jumper JP1 installed. If you have separate Heating
and Cooling system transformers, CUT JUMPER JP1.
Wire RC to the Cooling system transformer and RH to the
Heating system transformer.
J4
Y2 Comp 2
W2 Heat Stage 2
Orange
Black
S2
STD
SW1
1
2
OFF ON
HP
Red(or RC for split systems) Wire R to either RH or RC for common
transformer HVAC systems
24V COM
HFRU REV P
JP1
RC&RH
FUSE
Set SW1-S1 to STD
Set SW1
-
S2 to OFF
Dipswitch SW1 Setup for Standard HVAC Systems
1. Set SW1-1 (position 1) to the STD position. (Off -to the left) (default setting)
2. Set SW1-2 (position 2) to the correct setting for your HVAC system.
a. Gas furnaces do not require fan outputs for heating calls. Set SW1-2 to the Off -to the left. (default)
b. Electric furnaces do require fan outputs for heating calls. Set SW1-2 to the On -to the right.

DCN: 141-00940-09 11/02/0717
HVACSystemWiring-HeatPumpSystems
Diagram 2 -Heat Pump System Wiring
Heat Pump HVAC System Setup Notes:
Single Stage Compressor Systems use Y1 for stage 1 heating/cooling, and W1 for stage 2 heating (heat
strips).
Two Stage Compressor Systems use Y1 for stage 1, Y2 for stage 2 heating/cooling, and W1 for stage 3
heating (heat strips).
NOTE: You must configure the Changeover valve setting to work correctly with your HVAC system.
Set Dipswitch SW1 as below for correct changeover operation. Changeover with cool is typical for
most systems. Check your system information to be sure. If you get cooling when you expect
heating, change SW1-S2 to the other position.
IMPORTANT! Do not cut JP1 for Heat Pump Systems.
RC and RH are common for Heat Pumps.
Heat Pump HVAC System
G Fan
W1 Heat Strips (Heat Stage 3 )
Y1 Comp Stage 1
R 24VAC Return
C 24VAC Common
Red
Green
White
Yellow
24V RH
W1 Heat 1
G Fan
Y1 Comp 1
W2/O CO
HVAC SYSTEM
THERMOSTAT CONNECTION
TXB16 Control Unit
Typical thermostat wiring color codes
Y2 Comp Stage 2
24V RC
J4
Y2 Comp 2
O Changeover Valve
Orange
Black
S2
Dipswitch SW1 Setup for Heat Pump HVAC Systems.
1. Set SW1-1 (position 1) to the Heat Pump position. (On -to the right)
2. Set SW1-2 (position 2) to the correct changeover (reversing valve) setting for your Heat Pump system.
a. For systems with changeover with cooling, Set SW1-2 to Off -to the left (default setting)
b. For systems with changeover with heating, Set SW1-2 to On -to the right
STD
SW1
1
2
OFF ON
HP
Wire R to either RH or RC
24C COM
HFRU REV P
JP1
RC&RH
FUSE
Blue
Note: Set SW1-S1 to HP
And S2 to correct Changeover valve
setting

DCN: 141-00940-09 11/02/0718
TXB16PowerConnection
Power from the HVAC System
The TXB16 Control Unit connects to the HVAC system’s thermostat connections and receives 24VAC
power from it.
All most all HVAC systems have standard thermostat connections. This may be a thermostat terminal strip
on the system control board or color coded wires. Typically, these connections are marked as follows:
Terminal Marking Wire Color Use
CBlue 24VAC Common power
RRed 24VAC Return power
GGreen Fan signal
WWhite Heat signal
YYellow Cool signal (Compressor)
There may be others like orange, brown and black for other functions, refer to the HVAC wiring diagrams.
You must connect both 24VAC power connections to the TXB16 control unit:
the 24VAC common, marked as C on the thermostat connections or the BLUE wire,
and
the 24VAC return, marked R on the thermostat connection or the RED wire.
Note: If the HVAC system power is off, then power to the thermostat will be off as well.
HVAC System Transformer Types
Most Common Type: By far the most common HVAC system is the Standard Gas central heating/cooling
forced air system with a single 24VAC power transformer. (Electric heating also falls into this category)
Separate Heating and Cooling systems: These are essentially two systems with a common air handler
or blower. In this case there is a separate heating 24VAC transformer and a cooling 24VAC transformer.
This type of a system requires that the Control Unit be connected using a separate heating system power
input R terminal (RH) and a separate cooling system power input R terminal (RC). When connecting to
these systems you must “split” the RH/RC power connections on the HVAC control unit HVAC terminal
connections (J4). See wiring diagram for instructions on cutting this jumper, JP1.
Heat Pump Systems: These systems have a common transformer like standard central heat/cool
systems. Wire the HVAC system R to either of the Control Unit’s RH or RC terminals.
Connecting the HVAC system power to the HVAC Control Unit
For all systems:
Connect the HVAC system 24VAC Common C (or Blue wire) to J4 24Com connection.
For Standard and Heat Pump systems:
Connect the HVAC system 24VAC Return R (red wire) to either the control units J4 RH or RC terminals
(they are jumpered together by JP1)
For “split” or separate heating /cooling transformers systems:
First CUT the jumper wire at JP1 (this separates the RH and RC terminals)
Connect the heating system’s R terminal (or red wire) to the control units J4 RH terminal.
Connect the cooling system’s R terminal (or red wire) to the control units J4 RC terminal.

DCN: 141-00940-09 11/02/0719
WiringtotheX10PowerlineInterfaceModule
The X10 interface on the Control Unit is the RJ11 jack, J4. It is connected to an X10 power line interface
module, Model PSC05 or TW523, by the four (4) wire modular phone cable provided.
IMPORTANT NOTE: Use the Modular Cable Provided. If you do not, be sure the cable is the correct
type. The Cable must be 4 wire (NOT 2), and reversing.
If you are having X10 communication problems or in doubt about the cable, check the cable with the simple
inspection shown below.
RJ11
JACK
X10 PLI
X10 PLI
MODULE
4 WIRE MODULAR CABLE
Place the ends of the cable
side by side and verify the
color codes of the
conductors are in reverse
order as shown here. B R G Y B R G Y
INCORRECT CABLE WIRING
DO NOT USE THIS CABLE
TXB16 CONTROL UNIT
J4
120V OUTLET
B R G Y
Y G R B
CORRECT CABLE WIRING

DCN: 141-00940-09 11/02/0720
SYSTEM CHECKOUT
It is strongly recommended that you hook-up and run a simple bench test before installing the TXB16. Not
only will this save you time in system checkout but will also familiarize you with the thermostat’s operation.
THERMOSTAT BENCH TEST
1. Connect the Wall Display Unit to the Control Unit with a short (12-24 inch) 4 wire cable.
2. Before power up, set the Control Unit dipswitch, SW1, to ALL OFF
3. Connect power to the Control Unit. You will need a separate 24VAC transformer if you are not
connected to the HVAC system thermostat connections for power.
4. Verify Control Unit Status LED is blinking.
5. Verify the WDU display comes on and shows the current temperature.
a. If no display and backlights are not on, check wiring and power at the Control Unit.
b. If a “CF” display is shown on the WDU, double check your wiring to the Control Unit.
d. Do not proceed until the current temperature is displayed on the WDU.
6. With the current temperature displayed on the WDU, we have verified communication between it and the
Control Unit is OK. Any communication problems will result in a “CF” (Communications Failure) display on
the WDU and must be fixed before proceeding. If all is OK with the WDU proceed to the next step.
7. Press the Fan button on the WDU. The Control Unit’s Fan LED and relay should turn on.
8. Press the Fan button again. The Fan LED and relay should turn off.
9. Press the Mode button until the WDU is showing “H” for Heat Mode.
10. Press the Setpoint Up button until the setpoint is above the current temperature. The Heat LED and
relay should come on. (If they don’t, make sure the Status LED is not flashing twice indicating minimum off
delay…wait until LED stops flashing twice before proceeding).
11. Press the Mode button until the WDU is showing “O” for OFF. The Heat LED and relay will turn OFF.
12. Wait 6 minutes for the minimum off delay to expire. The Status LED will stop flashing twice.
13. Press the Mode button until the WDU is showing “C” for Cool Mode.
14. Press the Setpoint Down button until the setpoint is below the current temperature.
15. The Compressor and Fan LEDs and relays should turn on.
16. Press the mode button until the WDU is showing “O” for OFF Mode.
17. All LEDs and relays should turn off.
18. When you have successfully completed all these tests, you have verified that the TXB16 is working
correctly.
X10 QUICK TEST
Requires an X10 Mini-Controller or Maxi-Controller or a known good source of X10 signals.
1. With the TXB16 connected as above, proceed with connecting the X10 Interface Module.
2. Connect a four wire modular phone cable to the Control Unit.
3. Connect the other end of the cable to the X10 Interface Module.
4. Plug the X10 Interface Module into a 110VAC outlet. The module’s LED should be ON.
5. Plug an X10 Controller in the outlet.
6. Set the House Code on the X10 controller to match the TXB16 Control Unit (Example: House Code A or
1 on the WDU).
7. Send Unit code ON and OFF commands from the X10 controller and verify that the WDU display shows
the correct response to each command sent per the X10 Decode Tables
8. Verify the TXB16 Status LED is showing X10 commands being received. You should see 4 rapid flashes
if the address is correct, only 2 if the command is not address correctly.
9. The LED on the X10 Interface Module should blink with each command sent from the X10 controller.
10. If you have difficulty receiving X10 commands, double check the modular cable, the X10 Interface
Module and the House Code settings. .
11. If the TXB16 responds properly to the X10 commands, proceed with installation.
It is recommended that you install the TXB16 and then rerun these quick tests BEFORE you connect the
controller to the HVAC system. You will be confident that the TXB16 is working correctly before you
attempt to interface to the HVAC system.