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Figure 13A - Display Meaning
Modulation Control
Modulation of the burner’s fi ring rate is accomplished
by driving the damper motor in small increments to
either increase or decrease rate in response to boiler
demand. A pressure transducer (for steam boilers) or
temperature sensor (for water boilers) senses boiler
demand and communicates it to the controller. Display
and programming functions for the Siemens RWF40
controller are shown in Figure 13A with the controller in
the basic display mode.
Figure 13B - Manual Mode
The damper motor can be manually operated for set-
up and service of the burner by placing the controller in
the manual mode, as shown in Figure 13B. Press and
hold the EXIT button for 10 seconds to enter the manual
mode. The manual operation light will illuminate.
Putting in manual mode:
Press and hold exit button for
10 seconds.
Manual operation light will
illuminate.
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Figure 13C - Manual Operation
The damper motor can be driven from low to high or high
to low by pressing the up and down arrows as shown in
Figure 13C. Pressing EXIT for 10 seconds returns the
controller to the automatic mode.
Operation in manual mode:
Once in Manual Mode, the
damper motor can be driven
from high to low using the
up/down arrows.
To return to the automatic
mode, press and hold exit
button for ten seconds.
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Figure 13D - Operation Set Point
The operating set point can be changed as shown in
Figure 13D. Pressing the PGM button accesses the
User Level of the software, where this change is made.
The up and down arrow buttons raise and lower the
operating set point. Pressing EXIT returns the control to
the Basic Display level and saves your changes.
Programming functions within the software are used
to match its settings to the connected hardware, and
to adjust the control’s response to unusual job site
requirements if necessary. A manual for the controller
is provided with the burner to allow programming at that
level.
Setting operation set point:
From the original display, press
program button once. (User
level)
Set point 1 is displayed.
Use up/down arrows to change
setting.
When fi nished, press exit.
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ACTUAL VALUE
(CURRENT OPERATION)
SET POINT VALUE
BURNER RELEASED
FOR OPERATION
DAMPER CLOSING
(MODULATE DOWN)
DECREASE VALUE
PROGRAM BUTTON
MANUAL OPERATION
WHEN LIT
DAMPER OPENING
(MODULATE UP)
INCREASE VALUE
EXIT BUTTON
Section: Start the Burner