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8 Internal Burner Firing Rate Controller
Fig. 8-1 Control by atmospheric conditions
8.11 Setpoint Changeover
You can switch the setpoint with the input "setpoint switchover". If you use a version with fixed
setpoint value it is possible to select one of the two values, which are entered in the parame-
ters 796 and 798 with this contact.
If you have activated the control by atmospheric conditions additionally, you can select be-
tween two pairs of limit values (see control by atmospheric conditions and limit ranges). The
parameters for setpoint 1 (for setpoint switching) and setpoint min. 1 (for control by atmos-
pheric conditions) are equal. Likewise the parameters setpoint 2 and setpoint min. 2. The cor-
responding content is assigned according to the configuration.
When activating the "control by atmospheric conditions” option and setting the adjustable pa-
rameters, you may realise an external setpoint default. In other words, the setpoint can be ad-
justed manually or automatically via a potentiometer (or switched through resistors). By
connecting a change-over switch, you can implement a night-time reduction instead of control
by atmospheric conditions. A control by atmospheric conditions and a night-time reduction can
be realised simultaneously, if you combine the control by atmospheric conditions with the set-
point switching.
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