7 Intelligent Boiler Sequencing - IBS
Mk8 MM Manual Page | 137
7 INTELLIGENT BOILER SEQUENCING
The objective of Intelligent Boiler Sequencing (IBS) is to ensure that the minimum number of boiler/ burner
units are in operation at any one time to satisfy the heat or steam requirement imposed upon the boiler plant,
in the case of multi-boiler installations.
The benefits from using IBS include an increased savings in electrical costs, a reduction in thermal stress on
the lag boilers, and an increase in overall plant efficiency. It is possible on the MMs to select steam
sequencing, low pressure steam sequencing and hot water sequencing.
There are variations of the IBS software that can be selected via the options/parameters procedure: hot
water boilers, and steam boilers.
A maximum of ten MM, EGA, universal I/O modules may be interconnected by a two wire screened data
cable. Any MM interconnected may be selected as the lead boiler for the sequencing. The lead boiler is
identified by:
1. Connecting a mains voltage onto Terminal 88 (only on the Mk8 MM)
2. Selecting Lead boiler in the IBS screen
3. Instructing the modules via the DTI module (Data Transfer Interface) or by PC CEMS Audit software.
The sequence order of the MMs in the loop can be changed by changing their ID numbers or by changing
the order on the DTI if shuffle sequencing is enabled through parameter 101.
Sequencing can be used with external load detector and multi-burner operation, but it cannot be used with
external modulation.
7.1 Sequencing Schematics
Please see sections 1.5 and 1.6 for the sequencing wiring diagrams.
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