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Benchmark 2500DF-3000DF
CHAPTER 10. BOILER SEQUENCING TECHNOLOGY
CHAPTER 10. BOILER SEQUENCING TECHNOLOGY
10.1 INTRODUCTION
The C-More on-board Boiler Sequencing Technology system (BST) is an integrated 8 boiler control
system designed into the C-More controller. The BST has its own sophisticated PID control system
designed to simultaneously control the light off and modulation of up to 8 boilers while achieving
maximum operational efficiency.
BST is designed to ensure that all Boilers in the system operate at maximum efficiency. This is
accomplished by lighting off boilers only if all ignited boilers reach or exceed a defined Valve Position
(Fire Rate). Operating all boilers below the defined Fire Rate "Next on VP" (for Next Turn on Valve
Position) insures that they are firing at their most efficient Fire Rate. One C-More unit is defined as the
MASTER unit and all other C-More units on the BST Modbus Network are defined as SLAVE units. The
Master unit will monitor the system Header Temperature, monitor all Slave units' status information and
efficiently control all units in order to achieve and maintain the required BST Setpoint Temperature.
When there is a demand, the Master unit will light off one of the boilers based on the BST Sequencing
selection in the BST menu. As system load increases and the valve position of the ignited units reach the
Next On VP (% valve position), the BST master will light off the next available unit. A simplified block
diagram of multiple Boilers connected to a BST is shown in Figure 9-1 below.
Figure 10-1. Simplified BST Block Diagram
OMM-0099_0A
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913
Page 125 of 234
GF-145
Ph.: 800-526-0288
PR1: 05/21/2014
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