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.

HSRS is ideal for a number of venues including:

• Hotels
• Hospitals
• Condominiums
• Office buildings
• Industrial complexes
  
• Apartments
• Rental properties
  
• Schools & Universities
  
• and more!
  

HSRS Enclosure

Shuts off air conditioning or heating when a violation is detected Compatible with existing central air conditioning systems, heat pumps, and PTACs Works with existing HVAC equipment; requires no thermostat modifications Can also be used with PTACs, window fans, dampers, etc. 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

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Design Licensing

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.

Customer wiring is performed using convenient screw terminals.   The table below lists the terminal connections: