Control Logic - Smart temp SMT?770 Installer Manual

Control logic
This simple diagram (right)
provides a general insight
into the control logic of the
SMT‐770 thermostat. It
attempts to describe the
action of the DB=XX, the
SP=XX and SD=XX advanced
installer control capabilities
in both two set point and single set point mode. By adjusting these three values to suit
the needs of the user or equipment extremely tight temperature control can be
achieved, or a more energy efficient temperature control profile can be set.
In single set point mode (sw8=off) the individual heating and cooling set points are
replaced by a "Dead Band" where the heating and cooling differential is controlled by a
installer set value. This is the simplest method of temperature control.
Further, you are able to adjust how quickly the SMT‐770 "Chameleon" thermostat
responds to room temperature changes by adjusting the RS=XX value in the installer
menu. The lower this setting the faster the thermostat will respond to room
temperature fluctuations, the larger this number the slower the thermostat will
respond to changes in room temperature.
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