© 2013 Agrowtek Inc.
www.agrowtek.com
| 83 Ambrogio Dr Suite H Gurnee, IL 60031 | [email protected]
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Temperature Controls
Temperature controls consist of heating and cooling thermostats, and high and low temperature limits (shut-offs.)
Heating & Cooling Thermostats
Cooling Thermostats turn an output on or open VSC’s when the temperature is too hot. Cooling thermostats are used to
operate ventilation fans, curtains, windows, chillers, evaporative coolers and more.
Heating Thermostats turn an output on or close VSC’s when the temperature is too cool. Use heating thermostats to
operate heating systems including hvac air handlers, water heaters, floor heating and more.
Limit Thermostats
Lo-Temp Limits turn an output off or close VSC’s when the temperature is too cool. Low temperature limits can be used to
close down vents and curtains or stop ventilation fan outputs from operating if the outdoor temperature is too low.
Hi-Temp Limits turn an output off or close VSC’s when the temperature is too hot. High temperature limits can turn off CO2
combustion generators, light banks, and other equipment if a room is too hot, or to disable heating systems if the outdoor
temperature is above a minimum.
Limit thermostats take precedence over other commands to an output # or VSC channel.
Staging Thermostats
Thermostats can be staged for multiple levels of heating and cooling.
In the example above:
Heat 1 will operate any time the temperature drops below 58 and will continue to heat until 60.
Heat 2 will operate any time the temperature drops below 50 and will continue to heat until 55.
Cool 1 will operate any time the temperature rises above 75 and will continue to cool until 72.
Cool 2 will operate any time the temperature rises above 85 and will continue to cool until 80.
Cool 3 will operate any time the temperature rises above 90 and will continue to cool until 85.
Cooling T-stat #1
Set Point 75°F
Dead Band 3°F
4 5 5 0 5 5 6 0 6 5 7 0 7 5 8 0 8 5 9 0 9 5
Cooling T-stat #2
Set Point 85°F
Dead Band 5°F
Cooling T-stat #3
Set Point 90°F
Dead Band 5°F
Heating T-stat #1
Set Point 60°F
Dead Band 2°F
Heating T-stat #2
Set Point 55°F
Dead Band 5°F
Temperature
Reading
Limit
Control
If sensor reading exceeds
set-points
Turn OFF output
If output # is not 0
Set VSC Position on Channel #
Both close the VSC
If channel # is not 0
Temperature
Reading
Thermostat
Control
If sensor reading exceeds
set-points
Turn ON output
If output # is not 0
Set VSC Position on Channel #
Cooling Opens, Heating Closes
If channel # is not 0
