Benchmark 1500 - 2000 Boilers
CHAPTER 2 – INSTALLATION
OMM-0097_0E AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 33 of 182
GF-142 Ph.: 800-526-0288 10/01/2015
2.14 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,
the isolation valve opens for a programmed interval (default = 1 minute) before closing. When
the system load is satisfied, the BST system will open the isolation valves for all of the boilers.
The implementation of BST, and the installation and use of this valve is optional.
The boiler is pre-wired to accept the sequencing isolation valve. Installation consists of installing
the sequencing isolation valve in the hot water outlet pipe, and then connecting it into the shell
harness, as described below.
NOTE
When the Sequencing Isolation Valve is used, the AUX START ON DLY in
the Configuration menu must be set to at least 120 seconds. The
Sequencing Isolation Valve control is only available when BST is enabled.
Refer to section 2.10.12.2 and Table 3-4 in section 3-6 and Chapter 9.
Installing Sequencing Isolation Valve
1. Install the sequencing isolation valve in the boiler’s hot water outlet pipe.
Figure 2-13: Sequencing Isolation Valve Installed
OUTLET
ISOLATION VALVE
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