Example
Let’s assume the following configuration:
• Thermostat is configured for cooling operation
• Comfort setpoint is set to 25ºC
• Standby setpoint is set to 27ºC
If the thermostat is in initially in Comfort mode, and a value of 28ºC is written to the
“Setpoint” communication object, it will automatically switch to Standby mode.
A configuration parameter controls if and when temperature setpoint changes are stored per-
manently:
•
Never
: Temperature setpoint changes are never stored permanently.
•
Manually
: A “Save setpoint” communication object is enabled. By writing to this object,
the current setpoint value will be stored as the default setpoint for the currently active
operating mode, overwriting the initial value that was set in ETS.
•
Upon mode changes
: The current setpoint value will be automatically stored as the
default setpoint for the currently active operating mode whenever there is an explicit
change of operating mode, or when the thermostat switches from heating to cooling or
vice-versa
Setpoints can be restored to their original values (as defined via ETS parameters) at any time
via the “Reset setpoints” communication object.
The above discussion applies to the Comfort, Standby, and Economy operating modes. It is not
possible to manually adjust the setpoint for Building protection mode.
2.4.3.3
Relative Setpoints
In the “Relative Setpoints” method, the effective setpoints for the Comfort, Standby, and
Economy operating modes are defined relative to a common base value (the
base setpoint
),
according to the following equation:
Effective setpoint = Base se Mode User offset
2
Additional considerations apply if the thermostat is configured for automatic switching between heating and
cooling. See
Additional considerations if Absolute Setpoints are used
on page 34.
2.4
Thermostats
30
