RCS X-10 TX15, X-10 TX15-B, X-10 TX15R, X-10 TX15R-B Installation And Operation Manual
X-10 Thermostat
Standard Model TX15
Bi-directional Model TX15-B
Remote Sensor Model TX15R
Remote Sensor Model TX15R-B
INSTALLATION AND OPERATION MANUAL
Applies to the following revisions or later:
TS15 WDU Rev 07
HCXB HVAC CU Rev 03
HCXP HVAC CU Rev 03
HCXE HVAC CU Rev 03
HCXL HVAC CU Rev 03
(PCB Rev E)
DCN: 141-00410 Rev 05
4/00
*** IMPORTANT NOTICE ***
DO NOT USE THIS PRODUCT FOR BUILDING FREEZE PROTECTION! YOU ARE ADVISED TO
INSTALL A MECHANICAL FREEZE PROTECTION DEVICE FOR THIS PURPOSE.
2
1. TX15 OPERATION
SYSTEM MODE BUTTON
MANUAL FAN BUTTON
The TX15 series thermostats provide typical thermostat functions as well as the capability to receive X-10
powerline carrier signals. The X-10 commands allow for the thermostat’s Setpoint, Mode and Fan
functions to be changed remotely. In addition, the TX15-B series has bi-directional capability and can also
transmit information by X-10 commands using an extended X-10 command set.
The TX15 thermostats consist of two parts, a
Wall Display Unit (WDU)
and a
Control Unit
. The Wall
Display Unit looks like a traditional thermostat and is the wall mounted user interface for the TX15 series.
It provides display, control pushbuttons and the temperature sensor. The WDU connects to the Control
Unit by a 4 wire cable. The Control Unit connects to the HVAC system in place of a standard thermostat
and provides the thermostatic temperature control of the system. The Control Unit also has the X-10
interface input and the 12 VDC power supply input.
TS15 Wall Display Unit
The WDU has a two digit back-lit LCD display, control buttons for changing the Setpoint (Up and Down),
Mode (Off, Heat, Cool, Auto) and manual Fan (On/Auto) functions and a digital temperature sensor. The
LCD display serves as a common display for current temperature, setpoint, mode and manual fan status.
The display normally shows current temperature and switches to show setpoint or mode when those
buttons are pushed. Remote sensor versions do not have an internal sensor and have a connection for a
remote sensor, such as the RS15 wall mounted temperature sensor.
Any changes in temperature, or control button operations, are transmitted to the Control Unit. Updates in
setpoint or mode can also be received by the WDU from the Control Unit. When updates are received,
they are displayed for 3 seconds and then the display returns to the current temperature.
TS15 WDU
LCD DISPLAY - SHOWS
CURRENT TEMP NORMALLY.
SETPOINT OR MODE WHEN
BUTTONS PUSHED.
.7.5
SETBACK MODE ON INDICATOR
SETPOINT INCREASE BUTTON
SETPOINT DECREASE BUTTON
MODE
FAN
MANUAL FAN ON INDICATOR
LCD Display
The LCD display normally shows the current temperature. 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 blink whenever the setback mode is active.
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
UP
The
cause the LCD display to change to show the
(before the display switches back to current temperature) will decrement or increment the setpoint value by
one degree. Pushing and holding a button down will cause the setpoint to continuously change until the
and
DOWN
buttons control the setpoint temperature. Pushing the
current setpoint temperature
UP
DOWN
or
button once will
. Pushing the button again
DCN: 141-00410-05 4/00
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button is released. After 3 seconds of no activity, the LCD display will change back to show the current
temperature and the new setpoint value will be transmitted to the Control Unit.
The setpoint can be set from 40F to 99F ( 5C to 37C).
There is only
setpoint shows the setpoint of the
will be used for the new mode, unless otherwise changed by local (buttons) or remote updates.
MODE
The MODE button controls the HVAC system mode. To see what mode the HVAC is in, push the MODE
button once and the LCD display will change to show the current mode. Pushing the
while the MODE is being displayed, will cause the mode and display to change to the next mode. The
system mode cycles from
button. Any change in the system mode is transmitted to the Control Unit.
When HP system type is selected on the Control Unit, an additional system mode of “
Heat, is included in the TS15 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
FAN
The
On and pushing it again will turn the fan to the Auto mode (OFF unless turned on by the furnace or AC).
The right decimal point of the LCD display will come on when the manual fan is ON. Changes in the fan
mode will be transmitted to the Control Unit.
Temperature Display
The WDU will normally display the current temperature from the internal digital temperature sensor or a
remote sensor. The sensors have an accuracy of +/- 1F(+/- .5C) for the range of -67F(-55C) to
257F(125C). The WDU will display temperatures from 0F/C to 127F/C. Temperatures less than 0 will
be displayed as 00, temperatures over 100 will be displayed without the leading 1 (example: 102 as 02.)
ONE
setpoint for the WDU, and it is used for both heating and cooling. The displayed
Off
current mode
Heat
to
to
Cool
of the system. If you change modes, this same setpoint
to
Auto
and back to
Off
button controls the HVAC system’s manual fan. Pushing the
MODE
again with each push of the
EH”
FAN
button once will turn the fan
button again
, or Emergency
MODE
Temperature Display Calibration
The TS15 and TS15R Wall Display Units have the capability for the user to adjust the calibration of the
unit from the front panel. If you desire to change the displayed temperature calibration, you may do so by
adjusting the Calibration Offset.
What you are adjusting.
measured by the WDU to be added or subtracted by an offset of 0 to + or - 7 degrees.
When in the Calibration Mode, the LCD screen will be displaying a number from 0 to +/- 7. This is the
current calibration offset. The factory default is usually ”0” but may be set to a factory offset also.
For instance, if the display shows 70 degrees and the desired temperature display is 72 degrees, you
would change the calibration offset by increasing it 2 degrees. If the offset was 0 degrees, then the new
offset would be 2 degrees and this is what is displayed on the calibration offset display.
If the displays shows 70 degrees and the desired temperature display is 68 degrees, you would change
the calibration offset by decreasing it 2 degrees. If the offset was 0 degrees, then the new offset would be
–2 degrees.
Remember: what you are changing is a number from 0 to +/- 7.
You are adjusting a calibration
OFFSET
. This allows for the temperature
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How to enter the Calibration Mode and view the Calibration Offset.
To enter into the calibration mode, FIRST press and HOLD the “MODE” button and then simultaneously
press the “FAN” button until “CO” appears on the LCD display.
Release the buttons and the current calibration offset number will appear on the LCD display. This is
usually “0” but may be any number from 7 to –7.
When viewing the calibration offset only and you do not change it, the display will automatically revert back
to current temperature display after 20 seconds of no activity.
How to change the Calibration Offset.
Enter into the calibration mode as described above. This will display the current Calibration Offset.
Determine how many degrees you want to change the temperature calibration, a maximum of + or – 7
degrees.
Adjust the Calibration Offset by pressing the UP or DOWN buttons. Each button press increments the
offset by 1 degree. You will see the offset displayed on the LCD screen.
When you are done with adjusting the calibration offset, the WDU will automatically store the new offset
and return to the current temperature screen after 3 seconds of no activity.
The new temperature offset will be calculated and displayed on the next temperature update cycle.
It may be several seconds before you see the temperature change.
WDU “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 communication failure. Momentary display of “CF” caused by bad or lost data,
will clear automatically when data communication 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.
To verify WDU operation, replace the unit with another known good unit.
TX15 CONTROL UNIT
The TX15 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 X-10 commands for remote control of the
setpoints, temperatures and modes of the thermostat. The bi-directional TX15-B unit also transmits
information via X-10 commands.
The TX15 Control Unit connects to the HVAC system the same as, and in place of, a standard thermostat.
The Control Unit works with either standard Gas/Electric or Heat Pump HVAC units.
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 X-10
commands. The Control Unit monitors this information and operates the HVAC system accordingly.
Standard HVAC Systems Operation
HEAT
In the
at
the setpoint. In the
and will turn off at the setpoint. In the
operate as usual with the one degree setpoint control. In order for the system to change operating mode
from heating to cooling, the temperature must rise two degrees above the setpoint. On subsequent calls
after a change over has occurred, the system will operate normally with the one degree setpoint control.
mode, the heating system will be turned on at one degree below the setpoint and will turn off
COOL
mode, the cooling system will be turned on at one degree above the setpoint
AUTO
mode, the current heating or cooling operating mode will
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This changeover difference of two degrees on the first call helps to prevent the system from
overshooting and oscillating between heating and cooling. Changes from cooling to heating works
similarly, with the two degree changeover difference being two degrees below the setpoint.
Standard System Mode Selection
leave the dipswitch SW1-1 set to the STD SYS position (OFF-default).
Fan Mode Selection
due to thermoswitch fan operation in the furnace. For Gas systems, dipswitch SW1-2 should be set to the
STD FAN position (OFF). Electric and hydronic heating systems generally DO require that a fan call be
generated along with the heat call. For these systems, dipswitch SW1-2 should be set to the FAN/HEAT
position (ON). Be sure to check your HVAC system’s requirements.
Minimum Run Time.
The system will continue to operate
the system mode is changed to off, the minimum run time is canceled and the system will go off
immediately.
Short Cycle Protection (SCP) Delay
minutes after any compressor operation. This delay prevents a subsequent compressor call until the delay
times out. This delay is to allow the compressor head pressure to bleed off before starting again. The
SCP is active in either STD or HP modes. In the Heat Pump mode, it effects both heating and cooling
cycles.
The Status LED on the Control Unit circuit board will blink twice during SCP delay periods.
. Normally, GAS heating systems DO NOT require fan calls along with the heat call
The Control Unit has a minimum runtime in either heating or cooling of 4 minutes.
. To set the Control Unit for standard GAS/ELECTRIC operation,
even if the setpoint is satisfied or changed
. The Control Unit has a short cycle protection (SCP) delay of 5
until MRT time-out. If
Heat Pump HVAC System Operations
The heat pump system mode works similarly to the standard systems. Normal heating/cooling calls and
auto-changeover function the same as standard systems. In addition, Heat Pumps have a second stage
of heating. Heat pump systems use the compressor for the primary heating/cooling source. During
periods of high heating requirements, additional heat stages, usually electric strip heaters, may be used.
These second stages of heating will be turned on when the current temperature falls four degrees below
the current setpoint and will turn off when the difference is reduced to two degrees below the current
setpoint.
Heat Pump Mode Selection.
Fan Mode Selection.
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 change over (sometimes referred to as
reversing valve) output from the Control Unit. Most heat pump systems are designed to work normally in
the heating mode and require a change over output for cooling. Set dipswitch SW1-3 to the CO/CL
position (OFF-default) for this type system. Check your HVAC system requirements for correct settings. If
your system requires change over with heating, set SW1-3 to the CO/HT position (ON). After the change
over relay output is first activated, it will stay on continuously even when there is no call until it is turned off
by changing to the opposite mode. This prevents continuously cycling of the reversing valve with each call
as a system is generally in heating or cooling mode for extended periods.
Emergency Heat Mode.
Emergency Heat Mode that can be enabled from the WDU mode selection. In the event of a compressor
failure, the “EH” mode can be selected. When in this mode, the second stage heating (heat strips) will be
used for stage one heat calls. This mode is for temporary use until the compressor can be repaired.
Set the Fan selection, SW1-2, to the STD FAN position (OFF).
For Heat Pump operation, set SW1-1 to the HP SYS position (ON).
When the Control Unit is selected for a Heat Pump system, there is an
Fahrenheit or Centigrade Selection
Fahrenheit or Centigrade mode is selected by dipswitch SW1-4. In the OFF position, Fahrenheit mode is
selected. Set SW1-4 ON to select Centigrade mode. This sets the mode for both Control Unit and WDU.
DCN: 141-00410-05 4/00
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