Connecting to main board / X11
Cascade
Controllers
(slaves)
Cascade
Controllers
(slaves)
Cascade
Controllers
(slaves)
Main board
Main board
Main board
Fig. 26. Principles of Cascade
Fig. 27. Cascading Module
alt
er
na
tiv
e
Common
Common
I-58
Z-038791_EN • Rev A
A
dditionAl
i
nformAtion
for
the
i
nstAller
Boilers in a Cascade System
In a heating system comprised of several boilers, it
is important that the power generated by the boilers
adapts at any moment to the demand of the instal-
lation, always optimising the generators’ efficiency.
Up to 4 boilers can be connected in a cascade to
one chimney, and 4 such groups of boilers with
their chimneys can be controlled using the control
unit of one boiler.
The boiler with device address 1 assumes the role
of the cascade master, and the others are slaves.
The master boiler activates the required functions
and shows the additional menus with the parame-
ters for use with the cascaded system.
This boiler has all the logic control of the cascaded
system and also regulates the stop/start sequence
of each boiler according to the demand of the in-
stallation.
The boilers are connected with each other using
the cascade module (see Fig. 27
)
. Each boiler has
its own module, which is connected directly to the
board.
When several boilers are cascaded through their
chimney system, make sure to install a non-return
valve (flue damper) between the boiler flue outlet
and the chimney connection. This will prevent any
back flow of the flue gases into a boiler that is not
in operation. Please refer to the manual provided
with the accessory for installation and maintenance
recommendations.
