IBC V-10, Manual, Page: 92 / 103

Term Definition
Opt out types
Load 1-4
The Opt Out Type for each load dictates how the load is handled by the multi-boiler
algorithm.
None : Only for boilers configured as a master. This load is serviced by the
entire multi-boiler network (the master will not opt out to service the load, but
will use all boilers to service it).
Single :
A subordinate boiler will opt out of the main multi-boiler network to service
a load.
Master boilers with a load configured as Single will opt out to service that
load, but will continue to control the subordinates and run the highest
priority multi-boiler load.
Group : The boiler will opt out of the main multi-boiler network to service this
load if commanded by the Group Opt Out Lead. Mainly for DHW purposes, it
allows a subset of the main multi-boiler network to be configured to opt out from
the main network load as needed to service the DHW load.
Note: The same load (1-4) must be configured as Group Opt Out on each boiler
in the group. For example, if Load 2 is configured as Group Opt Out on Boiler #1,
and you want #2 and #3 to also be part of the opt out group, then Load 2 must be
configured as Group Opt Out on boilers #2 and #3 as well.
One boiler must be chosen as the Group Opt Out Lead – this is the only boiler
that needs a physical call for heat (such as a thermostat) wired into the
controller on the Group load.
Only one opt out group is permitted per network. Once one load is configured as
Group, it must be set back to Single or None before a different load can be
configured as Group.
Outdoor °
From The Default setting is Outdoor. If an outdoor temperature sensor is being used the
sensor will normally be connected to the TB2 Outdoor Sensor terminals on the
controller board. Alternatively the TB2 2nd Loop Sensor or the DHW Sensor input
terminals can be wired to the outdoor temperature sensor. To support these alternate
wiring options the "Outdoor ° From" setting must be set to Sec. Loop or DHW to
correspond with the wiring.
Priority A load has a priority value between 20 and 90. Note: The Priority Value has to be
different for each load. A higher numerical value means a higher priority. Consider
these values as minutes. The difference between two load priority values is the
number of minutes the higher priority load will be allowed to operate before switching
back to the lower priority load. For example, if DHW has a priority of 80 and the Set
Point load has a priority of 50, the DHW load will operate for (80-50) 30 minutes while
the Set Point load is temporarily turned off.
Pump Post
Purge (sec) How long a load pump operates after the call for heat has ended. Each load pump can
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Section: Definition of terms