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Benchmark 5000-6000 Boiler Installation & Startup Manual
SECTION 2: INSTALLATION
2.15 SEQUENCING ISOLATION VALVE INSTALLATION
All Benchmark units are pre-wired with a connection for an optional motorized external
sequencing isolation valve (P/N 92084-TAB). This valve is an integral component of AERCO's
on-board Boiler Sequencing Technology (BST) solution. BST allows sites with multiple boilers to
have one boiler, acting as a "Manager" to manage the other boilers at the site, designated as
"Clients" in such a way that the efficiency of the entire boiler array is maximized.
When operated with the BST system, the Manager controls its own isolation valve and sends
signals to the Client units to open or close their isolation valves. After the boiler load is satisfied,
the isolation valve remains open for a programmed interval (default = 1 minute) then closes.
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. However,
when BST is implemented, use of this valve is strongly recommended.
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 to the pre-
wired connector on 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 120 seconds (see Section 2.6: CONFIGURATION Menu, item 16, in the
Benchmark 5000 – 6000 Operation and Maintenance Guide, OMM-0124 (GF-208). The
Sequencing Isolation Valve control is only available when BST is enabled. Refer to section
2.11.12.2 (wiring) and Section 6: Boiler Sequencing Technology in this guide, and Section
2.6: CONFIGURATION Menu in the Benchmark 5000 – 6000 Operation and Maintenance
Guide, OMM-0124 (GF-208).
OMM-0123_E • GF-207 • 12/17/2019
Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST
Page 34 of 95
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