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. The HSRS is a fully configurable device that provides energy efficient control for heating and cooling systems. The HSRS is fully configurable using onboard DIP switches, allowing you to establish specific operational parameters. For instance, configure the device to disable air conditioning or heating when any door or window has remained open for 10 minutes. Onboard DIP switches allow you to configure operational mode and delay parameters.  

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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). The wireless option accepts up to 8 compatible sensors. Even deploy a combination of both wired switches and wireless sensors.

The 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!
  

 
HSRS for wired-sensor applications

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	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 Fully programmable via DIP switch settings Optional shutoff delay Five status LEDs: one (1) system status plus four (4) switch sensor indicators Onboard relay: 10A @ 250VAC,  5A @ 100VDC Accepts wired inputs for monitoring up to 4 wired zones Wireless model accepts up to 8 wireless door sensors Configurable re-activate (relay on) and de-activate (relay off) delay periods Available modes for occupancy / vacancy detection (requires motion sensors) Selectable re-activate / de-activate time delays Terminal block connector for user wiring Powered by 24vac-to-12vdc converter  - included (optional 120VAC adapter also available)

The HSRS is ideally suited for use with split (central, ducted) systems. We recommend installing the HSRS controller near the air handler and routing a length of low-voltage wire into the unit for direct access to the HVAC's 24vac power. (Most any low voltage wire will suffice such as thermostat, telephone, intercom, or alarm wire.) The diagram below demonstrates a typical wiring installation.

Caution: Although HSRS wiring is not complicated, only a qualified HVAC contractor, technician or electrician should attempt the procedure. Wiring diagrams and instructions are provided for the purpose of demonstrating a typical installation. We accept no liability or responsibility for possible errors, omissions, or ambiguities. The installer assumes full responsibility for a proper install and to verify all wiring modifications. Should you encounter any issues during or after the install, contact us for free  support by phone or e-mail.

• Shut off power to the HVAC system.
• Remove front cover from the HVAC air handler unit.
  
• Detach HSRS enclosure lid by removing the retaining screws.
  
• Locate the low voltage 24v wire that powers the thermostat (typically red).
• Also locate the 24v common wire (typically blue or black).
  
• Perform necessary wiring as illustrated in the diagram above.
• Verify and double-check your completed modifications.
  
• Replace air handler front cover.
• Replace HSRS enclosure lid.
• Restore HVAC system power.

A convenient terminal block is provided for wiring purposes. The table below lists the terminal connections: