Instruction Manual

Benchmark 750/1000 Boiler Installation, Operation & Maintenance Manual
CHAPTER 2 – INSTALLATION
Page 34 of 192 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0082_0J
05/21/2014 Ph.: 800-526-0288 GF-130
Figure2-14: Schematic – System Pump Start using a Separate Contact Relay
Figure 2-15: Identifying the Presence of BMK Pump Relay Option 69102
2.15 SEQUENCING ISOLATION VALVE INSTALLATION
All Benchmark units are shipped with a connection for an optional motorized external
sequencing isolation valve (p/n 92084-TAB) included in the shipping container. This valve is an
integral component of the AERCO’s on-board Boiler Sequencing Technology (BST) solution.
BST allows sites with multiple boilers to have one boiler, acting as a “master” to manage the
other boilers at the site in such a way that the efficiency of the entire boiler array is maximized.
When operated with the BST system, the Master controls its own isolation valve and sends
signals to the slave units to open or close their isolation valves. After the boiler load is satisfied,