Air Conditioning Shut-off Switch
Energy Management Device


 
 
 
 

  • Description
  • Features
  • Licensing
  • PTAC
  • Central A/C
  • RF Option
  • Wiring
  • Comments
  • Purchase
  • Occupancy
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  •                               
    HVAC Smart Relay Switch
    Energy-saving device for heating & AC
     
     
     
    Automatically shut off air conditioning or heating when a
    monitored door or window remains open for a period of time!


    Free ground shipping

     HVAC Smart Relay Switch

    Reduce energy consumption in schools, hospitals, hotel rooms,
    apartments, condominiums, rental properties, and more!

    * Special offer!  For a limited time, get free UPS ground shipping.
            
    (U.S. only - except Alaska & Hawaii. Offer valid thru 5/31/14)



    Description

    In an era of high fuel costs, the HVAC Smart Relay Switch (HSRS) lowers energy bills by eliminating wasted power consumption.  The HSRS eliminates waste by monitoring open doors and windows.  Accepting wired and/or wireless sensor inputs, the HSRS automatically interrupts the HVAC system in the event of a violation such as a door or window that has remained open for a period of time or a room that has been vacant.  The HSRS is a fully configurable device that provides energy efficient control for heating and cooling systems.  In addition, the HSRS can be used as a general purpose controller for devices including dampers, fans, etc. The HSRS accepts one or more contact switch closures as control inputs.  Compatible with door/window reed switches, motion sensors, toggles, pushbuttons, etc., the HSRS can accept any switch or sensor device having normally open or normally closed contacts. The HSRS is fully configurable using onboard DIP switches, allowing you to establish specific operational parameters. For instance, configure the device to temporarily disable the air conditioning or heating system when any door or window has remained open for 10 minutes and then re-enable when the door has closed.  Onboard DIP switches allow you to configure operational mode and delay parameters. 

    The HSRS provides connections for as many as 4 wired inputs or zones.  Each input can accept a single switch sensor or multiple sensors if wired in a zone configuration (sensors are wired in series or parallel).  Typical switch sensors include reed switches, pushbuttons, toggle switches, or other devices.  (Note that the HSRS can be configured to accept either normally-open or normally-closed switches.) Wired inputs are also compatible with TTL signals.  (Note: Wired sensor cabling should be limited to 100 ft. max. at each input. Twisted-pair shielded cables recommended.)  

    And, with an optional RF receiver, the HSRS also accepts input from compatible wireless door/window sensors, motion detectors, and key fob transmitters.  The wireless option provides inputs for up to 8 additional devices.  Even deploy a combination of both wired and wireless sensors.

    The HSRS is the ideal energy management solution, reducing power consumption and energy costs.  Simply install door / window sensors and configure the controller with easy DIP switch settings. 




    HSRS
    is ideal for a number of venues including:

    • Hotels (also see hotel energy management solutions)
    • Hospitals
    • Condominiums
    • Office buildings
    • Industrial complexes
    • Apartments
    • Rental properties
    • Schools & Universities
    • and more!

     HVAC Smart Relay Switch
    HSRS Controller Board




    Features:


         
    Shuts off air conditioning or heating when a violation is detected
    Compatible with existing central air conditioning & heat pump systems
    Works with existing HVAC equipment; requires no thermostat modifications
    Can also be used with PTACs, window fans, dampers, etc. (see note below)
    Fully programmable via DIP switch settings
    Configurable parameters including trigger polarity, LED mode, buzzer enable, etc.
    Selectable time delay ranging from 0 to 10 hours
    Five status LEDs:  system status plus switch sensor indicators
    Onboard relay: 10A @ 250VAC,  5A @ 100VDC
    Accepts wired inputs for monitoring up to 4 wired zones
    Optional RF receiver add-on for 8 wireless zones
    Configurable re-activate (relay on) and de-activate (relay off) delay periods
    Optional wireless RF receiver for 8 wireless sensors, motion sensors, or fobs
    Available modes for occupancy / vacancy detection (requires motion sensors)
    DB9 interface for wireless RF receiver (for use with optional wireless sensors)
    DIP switches for mode selection & configuring operational parameters
    Selectable re-activate / de-activate time delays
    Terminal block connector for user wiring
    Powered by external 12VDC adapter (optional 24VAC adapter also available)
    Optional external power converter module accepts 24VAC for use with HVAC systems
    Can be customized to suit your specific requirements

     

    Note: PTACs, window units, and mini-split systems do not typically provide a means for external control by third party devices such as the HSRS. Please consult your HVAC contractor or technician to determine if external control is possible for your particular system. 



    Design Licensing

    This item is available for licensing to OEMs. This design is available for OEM licensing.  Licensing allows your company to manufacture this item and gives you royalty-free sales and distribution rights.  Click here for additional details.




    Application #1:  General Purpose (A/C, heater, damper, etc.)

    PTAC application



    Application #2:  A/C System - Complete Shutoff
    Central A/C



    Application #3:  A/C System - Condenser Unit Shutoff

    Central A/C



    Wireless RF Option

    For installations where traditional wire runs are not possible or may be inconvenient, we offer a wireless option that consists of sensor devices and RF receiver.
    Other compatible peripherals include motion detectors, key fob remote transmitters, etc. Door/window sensors are shown below: 
    Wireless door/window sensor
     
         
    Wireless door/window sensor
    Wireless door/window sensors

    The RF receiver includes antenna and compatible connector interface for direct connection to the HSRS controller. There are two available receiver models, shown below:  

    RF Receiver
    Type-A
    receiver






    Type-B
    receiver
    Antenna w/           
    coax cable            

    Type-A receiver is the first generation model. Type-B is an upgrade that features LED indicator and enhanced reception. Both models receive signals from compatible door/window sensors. The image below shows the items included in the wireless combo package.

    1. HSRS controller
    2. Receiver power cable
    3. Wireless receiver
    4. Door/window transmitter
    5. 110 VAC converter
    6. Whip antenna
    7. Receiver interface cable
    8. 24 VAC converter
    9. Antenna cable
    HSRS controller Notes:
    1. The power converter provides proper voltage to the HSRS controller. Only one of the two converters shown in the picture above will be needed in any given application.
    2. There are two possible receiver models as previously described. Type-B is shown in the picture.
    3. The receiver interface cable connects the wireless receiver to the HSRS controller. This cable is required for the type-B receiver but is optional for type-A. (The type-A receiver can be plugged directly into the HSRS controller.)


    Wiring

    Convenient screw terminals are provided for wire attachment. The table below lists the terminal connections:


    Terminal Description
    1 Input power (+12VDC)
    2 Ground
    3
    No connection
    4 Wired sensor #1
    5 Wired sensor #2
    6 Wired sensor #3
    7 Wired sensor #4
    8 Sensor return
    9 Sensor return
    10 Sensor return
    11 Sensor return
    12 Relay - COM
    13 Relay - N/C
    14 Relay - N/O



    The following instructions demonstrate wiring installation for a typical split system central air conditioning unit.
    The following items will be needed: screwdriver, wire cutter / stripper, splicing connectors, several feet or more of low-voltage wiring.

    Caution: Although HSRS wiring is not complicated, only a qualified HVAC contractor, technician, or electrician should attempt the procedure. These instructions are provided for demonstration purposes. Your technician assumes full responsibility for a proper install. While these instructions are believed to be accurate, we accept no liability for possible errors or omissions.

    • Remove HSRS cover.
    • Shut off power to the a/c system.
    • Remove front cover from the air handler unit.
    • Locate low voltage (24v) wires from transformer.
    • Cut and strip two wire segments of desired length.
    • Using splicing connectors, join each segment in parallel with existing 24v output wires from the transformer.
    • Connect remaining ends of the spliced wire segments into HSRS power converter terminals (white terminal block).
    • Cut one of the existing 24v transformer wires, creating two loose wire ends.  (Note: Be sure to cut the wire downstream of (past) the spliced connection you made in the previous step.  Cutting the wire upstream of the connection will inadvertently shut off the HSRS controller along with the a/c system when a door/window violation occurs.)
    • Strip the two loose wire ends.  (If desired extend the loose ends using additional wire segments and splicing connectors.)
    • Connect one wire end to HSRS terminal 12.
    • Connect the remaining wire end to terminal 13.
    • Replace air handler front cover.
    • Replace HSRS cover.
    • Restore a/c system power.


    Comments / Feedback

    As property manager of ocean-front vacation condominiums, we have had ongoing problems with guests who leave patio doors open so they can enjoy the view.  This has resulted in enormous electric bills, especially in summer months when the air conditioning has run continually.  We purchased and installed the HSRS in June, 2011 and were pleased to discover an immediate savings in our electric bills.  The system has been extremely reliable with no false detections.  In fact, one day a guest called to report that his air conditioning had stopped working.  When asked if any exterior doors were currently open, he replied, "yes".  After closing the door, the HSRS re-activated the a/c and resumed normal operation.  I'd recommend the system to anyone looking to save money on their heating and cooling costs.
     
    Sam M., Hatteras, North Carolina

    For more comments, click here.

    Purchase


    The HSRS is our flagship HVAC shutoff system and is available in both wired and wireless varieties. A less expensive alternative is our general purpose Quad Relay Delay Switch (QRDS-1000). The QRDS-1000 is a general-purpose relay device that can be used in any number of applications. Though less robust than the HSRS, the QRDS-1000 is easily suited for HVAC shutoff control. (We offer a free download tutorial in PDF format describing how to use the device as an HVAC shutoff.) Product pricing for both HSRS and QRDS-1000 products is listed below:

    Pricing

     
    System
     
     
    Wired
     
     
    Wireless
     
    Contact
    HSRS
    $219
    $399 E-Mail or
    Web-Form
     
    QRDS
     
    low as
     $149 
    $199 *
    Click Here





    * - The QRDS wireless system includes a third-party receiver system (sold separately). A custom-prepared interface cable must be solder-attached to the receiver's internal printed circuit board. In addition, a hole is to be drilled into the plastic enclosure for cable routing. (These customizations are not authorized by the receiver manufacturer & will immediately void the device warranty.) As a result, the QRDS wireless solution is considered a home DIY project and is not recommended for commercial use, product resale, or distribution.

     


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