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connected to the managing boiler.
d. The domestic hot water (DHW) circulating pump should
be connected to the managing boiler.
e. The central heating (CH) circulating pump(s) should be
connected to the managing boiler if they are intended
to be controlled by the boiler system.
2. Multiple Boiler Address & Menu Options: In order to
operate multiple boilers in cascade, a unique address must
be assigned to each of the dependent boilers.
a. To access the cascade menu:
i. Press the "MENU" button and select the following:
Settings g
Boiler Settings g
ii. Use the "h" and "i" buttons to select the proper
number for the flashing place in the PIN. Pressing
"ENTER" or "g" will advance to the next digit. If an
incorrect number is selected, press "f" to reselect.
iii. Once the 4-digit passcode has been entered, press
"ENTER" or "g" once to display the Installer
access only menus.
iv. Use the "h" and "i" buttons to select the scroll
through the parameter list. Descriptions and default
parameters for Cascade System operation can be
seen in Table 8.J.2.2.
v. Press "ENTER" or "g" to select the parameter to
change. The parameter value will then be highlighted
and flash.
vi. Use the "h" and "i" buttons to select the proper
parameter option. Pressing "ENTER" to finalize
selection.
vii. Once all parameters are set, press "BACK" or "f"
to return to the main display screen.
b. The default address for each boiler is "Stand-Alone".
c. Selecting a boiler address of "Managing" assigns the
boiler as the manager. Be sure that this is the boiler that
is connected to the system pumps and external sensors.
i. Once a boiler is configured as the managing
boiler, continue on to the remaining cascade
parameter options listed in Table 8.J.2.2. The
remaining options are intended to operate well
with most boiler systems using the default
parameters. However, the descriptions shown allow
the experienced installer or service person to modify
the operation of the cascade system if improvements
are warranted.
ii. The main screen with display
upper left hand corner to let the user know this is the
managing boiler.
Figure 8.8: Dependent Setpoint
BOILER CONTROL: INTERNAL WIRING & OPERATION
MODULE CASCADE SETTINGS
in the
iii. Number of Units (147) must match the total number
of boilers in the cascade system, including the
managing boiler. If any of the expected number of
dependent boilers is not present, the control will
generate a "Comm. Lost with module" (200)
warning error.
d. Once a boiler is configured as a dependent boiler, the
control switch, shown in Figure 8.7, must be in the
OFF position to operate.
i. The cascade depending boiler address must be set in
logical numbered order starting from 1.
ii. The main screen will display
upper left hand corner as well as "Dependent" in the
center of the screen to let the user know this is a
dependent boiler. Dep. #1 will show a "2" as shown
in the example.
f. Figure 8.8 illustrates the range defined by the Max
Offset Down and Max Offset Up parameter.
OFF
ON
Figure 8.7: Dependent Cascade Boiler Control
Switch Position
NOTICE
ALL DEPENDING boilers in the cascade system must
have the control switch, shown in Figure 8.6, to the
OFF position to operate.
NOTICE
(147) Number of Units must match the total number of
units in cascade including the Managing boiler for the
cascading system to operate correctly.
in the
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