In an era of high fuel costs, the HVAC
Smart Relay Switch (HSRS)
lowers energy bills by eliminating wasted power
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
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
mode and delay parameters.
The HSRS was recently
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The HSRS provides
connections for as many as 4 wired inputs or zones. Each input
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
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.
created several informative videos about the HSRS. Choose from the list to view
the desired topic.
Shuts off air conditioning or
heating when a violation is
with existing central air
conditioning & heat pump systems
with existing HVAC equipment;
requires no thermostat modifications
Can also be
used with PTACs, window
fans, dampers, etc. (see note below)
programmable via DIP switch settings
trigger polarity, LED mode, buzzer enable, etc.
shutoff delay ranging from 1 sec.
to 10 hours
status LEDs: system
status plus switch sensor indicators
relay: 10A @ 250VAC, 5A @ 100VDC
wired inputs for monitoring up to 4 wired zones
RF receiver add-on for 8
wireless door sensors, motions sensors, or fobs
re-activate (relay on)
and de-activate (relay off) delay
modes for occupancy / vacancy detection (requires motion sensors)
switches for mode selection & configuring operational
re-activate / de-activate
block connector for user wiring
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
you own or manage guest lodging such as a hotel or vacation rental?
Need to remind patrons to conserve energy? Measuring approximately 3" x
4", these adhesive-backed gems make great reminders.
(click to enlarge)
General Purpose HVAC
Control (A/C, heater, damper,
For installations where traditional wire runs are not possible or may
be inconvenient, we offer a wireless option that consists of
specialized controller, integrated RF receiver, door transmitters, whip
antenna, coax cabling, and mounting bracket.
The HSRS is
ideally suited for use with split (central, ducted) systems. We
recommend installing the HSRS controller near the air handler and
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
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
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
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
Replace air handler front
Replace HSRS enclosure
Restore HVAC system power.
convenient terminal block is provided for wiring purposes. The table below lists the
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
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
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
operation. I'd recommend the system to anyone looking to save
on their heating and cooling costs.