When operated with the BST system, the BST Manager controls its own isolation valve and
sends signals to BST Clients to open or close their isolation valves. After boiler load is satisfied,
its isolation valve remains opens for a time interval defined in the SH Valve Close Delay
parameter (see Main Menu → Advanced Setup → BST Cascade → Operating Controls →
Sequencing Controls; default = 1 minute), then closes.
Once system load is satisfied and all Client units have stopped firing, the BST Manager opens
the isolation valves of all Client units.
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.
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:
The Sequencing Isolation Valve control is a pre-programmed valve, available only from
AERCO. It is installed only on boilers that are part of a Boiler Sequencing Technology group.
Refer to Section 7: Boiler Sequencing Technology in the Benchmark Platinum-Edge:
OPERATION-SERVICE Manual (OMM-0137, GF-211) for configuration instructions.
1. Install the sequencing isolation valve in the boiler’s hot water outlet pipe.
Figure 2-14: Sequencing Isolation Valve Installed
2. Find the grey cable inside the unit’s enclosure with the unused Molex connector with a cap
containing a jumper wire inserted in it (the jumper wire allows units that do not have a
sequencing isolation valve to operate normally). The other end is connected to the I/O
board and to a power supply.
Figure 2-15: Sequencing Isolation Valve Molex Connector and Jumper Wire
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