IBC SL 20-160 G3 Installation And Operating Instructions Manual page 35

NOTE
Load Combining is now available
to operate 2 compatible water
temperature loads at the same
time.
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.
INSTALLATION
SL 10-85 G3, SL 14-115 G3, SL 20-160 G3, SL 30-199 G3 MODULATING GAS BOILERS SL 10-85 G3, SL 14-115 G3, SL 20-160 G3, SL 30-199 G3 MODULATING GAS BOILERS
Figure 34: Typical two-temperature space heating piping concept
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