Modulating Burner, Analog Output; 2-Stage Burner, Floating Output - Siemens RWF40.000A97 User Manual

5.2.2 Modulating burner, analog output

5.2.3 2-stage burner, floating output

HVAC Products
In diagram area (1), the thermostat function is active.
In area (2), the controller maintains the adjusted setpoint.
HYS3
W
HYS1
100%
X1
0%
(1)
The positioning signal is delivered as a standard signal via the analog output.
F
The modulating controller must be available and configured in the unit (optional).
ð
Section 8.2 «C112 limit comparator, controller type, setpoint «SP1», locking»
In diagram area (1), the thermostat function is active.
In area (2), a 2-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».
HYS3
HYS2
W
HYS1
I
II
(1)
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).
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Section 5.6 «Response threshold Q»
CC1B7865en
5. Operating modes
q
A
(2)
B
q
A
(2)
05.12.2002
B
7865w05/1099
q
A
7865w06/1099
q
A
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