IBC V-10, Manual, Page: 26 / 103

When setting a load in external control mode, there are some key settings:
Set the boiler's maximum boiler supply and on/off differential temperatures. The boiler treats
these as high limit switches.
Burner On From - Use a thermostat or external control to control the supply of heat.
For guidance on wiring, see External control on page 42 . For setup instructions, see Setting up an
external control load on page 53 .
2.5 Zone Of
Boiler zone control enables you to set different spaces in a building with particular temperatures. If
you want different rooms or zones in a building to have the same temperature use the "Zone Of"
mode. This mode syncs the temperature, so that the temperature load settings in one area match
the "zone of" another area. These temperature load settings include matching load priority, target
and differential temperatures. If two rooms or zones in a building have different temperatures, use
the "load combining" strategy (see
Combining loads on page 26 ).
Note
"Zone Of" is not available until one or more active loads have been set up in the system.
Zoned loads can operate independently or simultaneously.
You can use this method of zone control to maximize energy costs. For example, you can zone
bedrooms that need lower room temperatures to match another area in the house that is set at a low
temperature. For instructions on setting "Zone Of", see
Syncing zones with "Zone Of" on page 51 .
2.6 Setting load priority
Boiler load is the total "work" performed by a boiler. IBC's controller uses a priority algorithm to
coordinate or schedule the delivery of heat in multiple load systems. This type of planning strategy
temporarily turns off one or more loads based on given conditions in the system. As an example,
an intermittent heating load (e.g., space heating) is suspended until a call for a DHW load has
been satisfied. Loads declared as DHW receive significant, but not absolute priority.
Multiple heating loads of varying temperature targets run in sequence with the use of a mixing
valve. Each load is serviced at the minimum possible temperature, as opposed to running hot then
mixing down (with hardware). Consider
Combining loads on page 26 .
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Section: Operating concepts