1-27
INSTALLATION
SL 26-260 G3, SL 40-399 G3 MODULATING GAS BOILERS
Figure 34: Multiple boiler inter-wiring
NOTE
When using the sequential
load feature of the IBC boiler,
attention must be paid to the
operation of system components
in order to ensure they are
compatible.
Many air handlers (fan coils)
for instance have a thermostat
connection that will energize an
internal relay to operate the air
handler circulator and its fan on
a call for heat. This may result in
operation of these components
when other loads are running at
a higher priority, resulting in cold
air blowing, or robbing heat from
another load.
Some wiring alteration may
be required to divorce both of
these functions from thermostat
control in favour of more
effective control from the IBC
boiler.
NOTE
For further information and
details regarding Multiple
Boiler application, consult our
Technical Notes - Multiple Boiler
Systems.
These notes provide
necessary detail on specific
single and multiple boiler
applications “Piping”, “Wiring”
and “Settings”. (available at
www.ibcboiler.com or from your
IBC Representative).
Figure 32: Multiple boiler piping
Figure 33: Jumper
