With the GSI-2
and Simple-Therm as your thermostat, you can control the AC via remote
control, with schedules, and more!
/ Slave Operation. This master unit is mounted close to the air handler
(furnace) unit. The wires coming out of the bottom are the standard thermostat
connections (24 volts) and the power and temp probes. The master unit
contains a relay board (GSI2-RLY) for connections to the HVAC system.
unit can be mounted in the living area and normally displays current inside/outside
temperature. Turning the knob changes the set-point. Pressing the knob
brings up the GSI-2 menu to turn the system to auto/heat/cool or fan.
PLEASE NOTE: The GSI-2 Controller has been discontinued. If your project calls for a similar controller, please
contact Gunn Systems for more information.
While many thermostats
are available, few can match the capabilities of a GSI-2 unit
running the Simple-Therm software.
Like Simple-Rulez, Simple-Therm files
and source code are freely available.
Some rather unique features allow the
GSI-2 unit to save energy beyond a simple
set-back type thermostat.
This application is in continuing development and testing. Please
contact us for more information.
- One knob setting. Simply turn
the knob to set the temperature. It doesn't get easier! 0.2
degree temp resolution to get it exactly where
you want it.
- IR Remote control. Uses
a Standard TV remote (Set for Sony TV commands) to set temp and
turn system on or off. You can change the thermostat from anywhere in
- Master-Slave operation. Remote-mounted
units communicate through RS-232 Serial communications. Master is located
near the HVAC unit, while the Slave can be mounted
anywhere. Wireless operation is
possible with optional RF modems.
- Ambient (room lighting) Light
Sensor compensates for day / nighttime
(set back and save energy using a larger On-to-Off span).
- Can drive Heat Pumps / Electric
Heat / AC / Gas. Has emergency heat
for heat pumps and has output for heat strip on heat pumps for large
- Security code access option.
With security code enabled, the user must first enter a combination
(very similar to the way an old combination lock works) to gain access
and set temperature or system on/off.
- Handles degrees in Celsius or
- Handles minimum compressor delay
- Handles minimum run time delay
- Programmable temperature calibration.
- Programmable span (allowable
temp span). Span may be programmed by time of day. Span may also be
programmed via lighting and outside temperature.
- Relays (two) on both master and slave
can drive Damper Controls.
- X10 interface
emulates RCS (Residential Control Systems) Thermostat operation,
allowing set-points and current temperatures to be sent over the house
wiring to home automation system.
- Zone level
HVAC control in future version.
Simple-Therm requires the GSI-2 with
the relay expansion board.
A Note about Applications for the
These are just suggested applications.
These are NOT complete products manufactured by Gunn Systems. All technology
is offered with no warranty or assumed liability. USE AT YOUR OWN RISK.
| GSI-2 Controller
| Electronic Product Development
| Application Software Development