RCS txb16 Installation And Operation Manual

RCS Residential Control Systems Inc.

Model TXB16

X10 Powerline

Communicating Thermostat

INSTALLATION AND OPERATION MANUAL

Applies to the following revisions or later:

Product Part No

TXB16 Thermostat Kit 001-00940-03
TS16 Wall Display Unit 001-00910-04
HCFX HVAC Control Unit 001-00860-03

*** IMPORTANT NOTICE ***

DCN: 141-00940

Rev 02

7/14/03

DO NOT USE THIS PRODUCT FOR BUILDING FREEZE PROTECTION! YOU ARE ADVISED TO

INSTALL A MECHANICAL FREEZE PROTECTION DEVICE FOR THIS PURPOSE.

TXB16 Operation

The TXB16 thermostat provides the latest technology in a full-featured universal thermostat with X10
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

• 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. The display shows the setpoint of the
current operating mode (in Auto mode, the system keeps track of the current operating mode of the last call,
either heating or cooling). New X10 bi-directional commands have been added for a heating setpoint and a
cooling setpoint. Note that the TXB16 maintains compatibility with single setpoint protocols by continuing to
support the current SP command for both inbound commands and status reports.

In addition to the universal Standard or Heat Pump systems 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 network address, F or
C 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 sens ors or an outdoor sensor.

The default X10 unit code decode table, B or P can be set to allow compatibility with existing TX15/TX15B
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 EE prom for permanent selection even with
power cycling.

For easy configuration as a replacement for older TX15 thermostats with the “B” decode table, dipswitch
SW1 position 4 can be set to ON to force “B” decode table use.

The Bi -directional protocol is now included as standard for the TXB16.

Remote control of the TXB16 via the X10 communications protocol allows for the thermostat’s temperature,
heating and cooling setpoints, operating mode and fan functions to be monitored or changed.

A robust X10 Bi-directional protocol allows full control of all the thermostat setup and operating parameters.
Many new commands have been added to support the TXB16’s new features. Refer to the X10 protocol

document, DCN 150-00200.

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TS16 Wall Display Unit

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

Shows current temp normally.

Shows setpoint or mode

when buttons pushed.

Setback Mode On Indicator

Setpoint Increase Button

Setpoint Decrease Button

TS16 WDU

.7.5

MODE

FAN

Manual Fan On Indicator

System Mode Button
Manual Fan Button

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.

UP – DOWN Buttons

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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.

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.

MODE Button

FAN Button

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°)

Outside Temperature Display

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If you attached a remote temperature sensor to the WDU that is set to remote sensor address “4”, you can

view the outside temperature by pressing the UP and DOWN buttons simultaneously.

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

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)

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 calibrat e as C2 and C4. Note that if remote sensor with

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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
C4 = calibrate remote sensor address 4 (only shows up in menu if attached)

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
Address 4: This remote sensor is used for an outside temperature sensor. (C4 in the calibration setup)

Table of Remote Sensor Functions and Sensor Addresses

Function Remote Addr 1 Remote Addr 2 Remote Addr 3 Remote Adrr 4

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 *
Outside temp display on WDU NA NA Yes

* optional outside temp sensor can be used with any other sensor address.

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

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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.

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TXB16 HVAC Control Unit

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 2 2 Single or split transformer
Electric 2 2 Selectable Fan with Heat
Heat Pump 3 2 Selectable Changeover with Heat or Cool
Radiant 2 2
Hydronic 2 2 Pump 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.

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.

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