Modulation Control - Beckett CG15 Manual

Section: Start the Burner

Modulation Control

Figure 13A - Display Meaning
ACTUAL VALUE
(CURRENT OPERATION)
SET POINT VALUE
BURNER RELEASED
FOR OPERATION
DAMPER CLOSING
(MODULATE DOWN)
DECREASE VALUE
PROGRAM BUTTON
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
Putting in 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.
22
MANUAL OPERATION
WHEN LIT
DAMPER OPENING
(MODULATE UP)
INCREASE VALUE
EXIT BUTTON
Press and hold exit button for
10 seconds.
Manual operation light will
illuminate.
Figure 13C - Manual Operation
Operation in manual mode:
○
○
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.
Figure 13D - Operation Set Point
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.
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.
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.