Sequencing Isolation Valve Installation - Watts Aerco BENCHMARK 750 User Manual

Benchmark 750 – 1000 Boiler User Manual - INTERNATIONAL

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 Heating Boilers to have one Heating Boiler, acting as a "master"
to manage the other Heating Boilers at the site in such a way that the efficiency of the entire
Heating 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 Heating 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 Heating 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 Heating 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.
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.
1. Install the sequencing isolation valve in the Heating Boiler's hot water outlet pipe.
SEQUENCING
ISOLATION VALVE
HOT WATER
OUTLET
Figure 2-13: Sequencing Isolation Valve Installed
OMM-0119_0A
GF-130-I
CHAPTER 2 – INSTALLATION
NOTE
Installing Sequencing Isolation Valve
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913
Ph.: 800-526-0288
Page 31 of 170
11/03/2016