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Check and Control the Temperature On-Site or Remotely!
X10 Bi-Directional HVAC System
X10 Bi-Directional HVAC System RCS TXB-16
RCS X10 Bi-Directional HVAC Thermostat
Item# 3045B
Free shipping on orders over $175 - See Details


  • Set temperatures between 4° & 99° F with X10 signals
  • Report temperatures between -60° & 131° F
  • Retain complete manual control from the thermostat
  • Works with standard and heatpump systems

Essential Info

Get complete local and remote control of virtually any thermostat function with this X10 Bi-Directional HVAC System that not only responds to X10 commands, but also has the ability to send reports via X10. When used with an intelligent home control system, you can have your system automatically respond with any action (i.e. turn on a ceiling fan, open or close dampers, etc.) when certain temperatures are reached. Yet with all its advanced, automated features, the system still offers the complete, manual control that you have with ordinary thermostats.

Responds to X10 Commands
With a simple X10 command, the system can set any temperature between 60° and 90°F, or a low temperature setting of 40°F. You can also use X10 to access other features, such as HEAT/COOL, AUTO, and OFF functions. These functions allow you to do things like:

  • Adjust the house temperature in the morning from an X10 controller that you can keep on your nightstand
  • Make sure your house is the perfect temperature when you get home with any X10 timer
  • Control the temperature with a phone call with an X10 telephone transponder

  • Manuals/Software

    More Info

    Responds to Status Requests
    If you have an intelligent X10 controller or home automation software that can send & receive advanced X10 codes, such as pre-set dim and request status, this system will respond to those commands. Systems that can directly control this bi-directional thermostat and understand its signals include:

  • Home Control Assistant
  • HomeSeer
  • Stargate/Stargate Lite
  • HomeVision
  • RCS CommStar network Controllers

    Depending on the controller, the X10 Bi-Directional HVAC System can provide it the current temperature. This information can be used to make decisions, run macros, or notify you that something is wrong.

    System Contents
  • Controller Unit (connects to your HVAC system)
  • Wall Display Unit/Thermostat (replaces your existing thermostat)
  • Plug-In TW-523 Module
  • RJ-11 Cable (connects the TW-523 to the Controller Unit)
  • 120VAC to 12VDC Power Supply

    Optional Expansion Accessories

    The X10 Bi-Directional HVAC System 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.

    Wall Mount Remote Temp. Sensor This optional Wall Mount Remote Temperature Sensor replaces the internal temperature sensor in the Wall Display Unit with an external sensor. This allows you to control and monitor temperatures in locations away from the display unit. Also, if the present location of your thermostat does not accurately sense the home's average temperature, you can place this unit in the optimum location. Manufacturer's part number: RS15.

    Pool/Spa Remote Temperature Sensor With the optional remote sensor you can even monitor temperatures in locations away from the RCS display unit. The sensor connects to the Wall Display Unit. Manufacturer's part number: RSP1/RSP2.

    The X10 Bi-Directional HVAC System 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.

    HVAC System Compatibility Chart

    System TypeHeating
    Gas22Single or Split Transformer
    Electric22Selectable Fan with Heat
    Heat Pump32Selectable Changeover with Heat or Cool
    Hydronic22Pump output

    X10 Command to Thermostat Function

    Unit CodeOn Command
    °F / °C
    Off Command
    °F / °C
    172° / 17°System Off
    273° / 18°Heat Mode
    374° / 19°Cool Mode
    475° / 20°Auto Mode
    576° / 21°40° / 5°
    677° / 22°60° / 6°
    778° / 23°62° / 7°
    879° / 24°63° / 8°
    980° / 25°64° / 9°
    1081° / 26°65° / 10°
    1182° / 27°66° / 11°
    1283° / 27°67° / 12°
    1384° / 29°68° / 13°
    1486° / 30°69° / 14°
    1588° / 31°70° / 15°
    1690° / 32°71° / 16°

    Decode Table B.  There are two other decode tables that can be used.  See manual for details.

  • Reviews

    5 Ratings
    5 star: 60%  (3)
    4 star: 0%  (0)
    3 star: 0%  (0)
    2 star: 20%  (1)
    1 star: 20%  (1)
    Average Customer Rating
    (5 customer ratings)
    Share your thoughts with other customers
    Matt Ruwe -- omaha, NE   2/24/2009
    I have the older model of this thermostat and can say that without a doubt it is of high quality and works perfectly. I even wrote and application to control it from a computer. Here's a link to an article describing my experience:
    ENZO -- vaughan, ON   10/17/2007
    I had trouble with installation but after spending over 1hr with Matt on the customer service we got it working. I was in California last week and picked up some Switchlinc. So far so good, everything is coming together
    BRIAN -- san jose, CA   7/19/2006
    worked as documented
    FRED -- midlothian, VA   6/20/2006
    Did everything it promised it would do
    WARREN -- shawnee mission, KS   4/22/2006
    I like the ease of programming the house code on this over the older units.
    BENJAMIN -- dallas, TX   2/10/2006
    Very nice once installed and communicating with your software, Works great with Indigo for the Mac, and works okay with Homeseer. You can write some really cool scripts with Indigo that make this Thermostat shine.
    THOMAS G -- oklahoma city, OK   11/14/2005
    ERIC -- irving, TX   7/10/2005
    This is my first product that I installed. It works... so far so good.
    ROBERT -- bedminster, NJ   6/22/2005
    Surprisingly simple to install.
    STEVEN -- sunnyvale, CA   3/23/2005
    Works well, no problems.
    CHRISTOPHER -- naperville, IL   1/24/2005
    Arrived on time and the product has worked great on a number of different installs
    MARK -- coppell, TX   1/8/2005
    Have 3 in the house now, each controlling a different AC/Heating unit. Works great.
    RYAN -- santa clara, CA   12/9/2004
    Works well. The power pull up resister lost its solder joint with the chip, but I could fix that with a little more solder.
    JAMES -- athens, GA   12/4/2004
    Absolutely fantastic device!! Easy to install and easy to use.
    R. DWAYNE -- farmersville, TX   11/29/2004
    Works great and exactly as expected. Installation was easy.
    James F. -- Franklin NC   10/25/2004
    I purchased two of these for use on a zoned system and they work fantastic using my HCA software. They were very easy to install and set-up. Definitely recommended!!
    SAMUEL -- fayetteville, NC   2/25/2004
    Seems to be a wonderful invention. You can't beat the ability to control home HVAC from a remote location!
    KURT -- stockton, CA   12/10/2003
    Great system. Works reliably. Even has the wife pleased!
    FREDRICK -- dearborn, MI   10/17/2003
    Worked pretty well. The manuals inside the box need to be updated because some of the default settings that were mentioned were incorrect. I had previously both a TX15 system a couple of years ago and am ( I think) pretty familiar with the product. - Fred

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