Control Logic - Robertshaw Smart Sense Series Installation Manual

Control Logic

Single Setpoint Mode
Cool Stage 2 ON
Cool Stage 1 ON
Heat Stage 1 ON
Heat Stage 2 ON
Figure 14 provides a general insight into the control logic of the thermostat.
Please review the action of the DB = XX, the SP = XX and SD = XX Advanced
Installer control capabilities in both the two setpoint and single setpoint modes.
By adjusting these three values to suit the needs of the user or equipment, it is
possible to achieve extremely tight temperature control.
In single setpoint mode (Sw8 = OFF) the individual heating and cooling setpoints are
replaced by a "Deadband" where the heating and cooling differential is controlled
by an installer set value. This is the simplest method of temperature control.
It is also possible to adjust how quickly the thermostat responds to room
temperature changes by adjusting the RS = XX value in the Advanced Installer Menu.
The lower this setting, the faster the thermostat will respond to room temperature
fluctuations. The larger the setting, the slower the thermostat will respond to
changes in room temperature.
Stage Delay
Cool OFF
Dead Band
Setpoint
Dead Band
Heat OFF
Stage Delay
Two Setpoint Mode
Cool Stage 2 ON
Cool Stage 1 ON
Span
Cool Setpoint / Cool OFF
Heat Setpoint / Heat OFF
Span
Heat Stage 1 ON
Heat Stage 2 ON
Figure 14
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