Benchmark Platinum-Edge: Operation-Service Manual
SECTION 7 – BOILER SEQUENCING TECHNOLOGY
OMM-0137_D • GF-211 • 7/16/2019 Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST Page 81 of 146
SECTION 7: BOILER SEQUENCING TECHNOLOGY
7.1 INTRODUCTION
The Boiler Sequencing Technology system (BST) is an integrated 16 boiler control system. It is
built into the Edge Controller. It has its own sophisticated PID control system designed to
simultaneously control the light off and modulation of up to 16 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 when 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
unit the BST network is defined as the “Manager” and all other units on the network are defined
as “Client” units. The Manager monitors the system Header Temperature, and also monitors all
Client unit’s status information, efficiently controlling all units in order to achieve and maintain
the required BST Setpoint Temperature.
When there is a demand, the Manager will light off one of the boilers based on the BST
Sequencing selection in the BST Cascade Status screen. As system load increases and the
valve position of the ignited unit(s) reach the Next On VP (% valve position), the Manager will
light off the next available unit. A simplified block diagram of multiple Boilers connected to a
BST is shown in Figure 7-1 below.
Figure 7-1: Simplified BST Block Diagram
NOTE:
After the boiler load is satisfied, the isolation valve remains open for a programmed interval
(default = 2 minutes) before closing. When the system load is satisfied, the Edge Controller
will open the isolation valves for all of the boilers. The BST controls the valves via a 0-20 mA
signal (see Section 2.11.1: I/O Board Connections in the Benchmark Platinum-Edge:
INSTALLATION Manual (GF-210)).
NOTE: Use either FFWD Header Sensor
or Modbus Header Sensor
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