2.13.1 DUCTED COMBUSTION AIR
For ducted combustion air installations, the air ductwork must be attached directly to the air inlet
connection on the sheet metal enclosure. Consult the Benchmark Venting and Combustion Air
Guide, TAG-0022 (GF-2050) when designing combustion air ducting.
In a ducted combustion air application, the combustion air ducting pressure losses must be
taken into account when calculating the total maximum allowable venting run. When using the
unit in a ducted combustion air configuration, the minimum diameter connection at the unit is:
2.14 BST 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, designated the “Manager,” 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 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, and is 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.
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