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Landis & Staefa Division CC1B7865E February 10, 2000 19/56
5. Operating modes
In diagram area (1), the thermostat function is active.
In area (2), the controller is controlling to the adjusted setpoint.
A
B
q
A
q
(2)
(1)
W
HYS1
HYS3
X1
0%
100%
7865w05/1099
The positioning signal is delivered as a standard signal via the modulating output.
)
The modulating controller must be available and configured in the unit (optional).
Ö
Section 8.2 «C112 Limit comparator, controller type, setpoint «SP1», locking»
In diagram area (1), the thermostat function is active.
In area (2), a
two-position controller
acts on the second stage, via relay 2 (open) and
relay 3 (close) by switching it into the circuit at the switch-on threshold «HYS1» / and
out of circuit at the switch-off threshold «HYS2».
q
A
B
q
A
I
II
(2)(1)
W
HYS2
HYS1
HYS3
7865w06/1099
In area (3), the actual value exceeds the upper switch-off threshold «HYS3» and the
controller shuts down the burner (B). The controller only starts low-fire operation when
the level falls below the switch-on level «HYS1» again. If «Q» is exceeded, the
controller switches to high-fire operation (A).
Ö
Section 5.6 «Response threshold Q»
5.2.2 Modulating burner, modulating output
5.2.3 Two-stage burner, 3-position output
19


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