AERCO BMK 6000 - Manual (Page 34)

Benchmark 6000 Boiler Installation, Operation & Maintenance Manual
CHAPTER 2 – INSTALLATION
Page 34 of 210 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0086_0D
03/20/14
Ph.: 800-526-0288
GF-133
2.13 DUCTED COMBUSTION AIR
For ducted combustion air installations, the air ductwork must then be attached directly to the air
inlet connection on the sheet metal enclosure.
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. See the AERCO
Benchmark Venting and Combustion Air Guide, GF-2050. When using the unit in a ducted
combustion air configuration, each unit must have a minimum 8 inch diameter connection at the
unit.
2.14 SEQUENCING VALVE INSTALLATION
All Benchmark units are shipped with a connection for an optional motorized external sequencing
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.
The implementation of BST, and the installation and use of this valve is optional.
The boiler IS pre-wired to accept the sequencing valve. Installation consists of installing the
sequencing valve in the hot water outlet pipe, and then connecting it into the shell harness, as
described below.
1. Install the sequencing valve in the boiler’s hot water outlet pipe.
Figure 2-13: Sequencing Valve Installed
2. The boiler’s shell harness has one unused cable. One end of this cable is connected to the
DELAYED INTERLOCK IN terminals in the I/O board (see Figure 2-14) while the other end
contains a Molex connector with a jumper wire inserted in it (this jumper wire allows units
that do not have a sequencing valve to operate normally). Find the free end of this cable
inside the unit’s enclosure.
HOT WATER
OUTLET
SEQUENCING
VALVE