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,
