Benchmark 750-6000 with Edge [i]: Install-Startup Manual
SECTION 2
– INSTALLATION
OMM-
144_B • GF-217 • 5/25/2020 Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST Page
45
of
62
If pump/valve load exceeds the above contact ratings, use a separate contact relay, as shown in
Figure 2-14.
Figure 2-14: Schematic
– System Pump Start using a Separate Contact Relay
2.15 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 in the
Main Menu
→
Advanced Setup
→
BST Cascade
→
Operating Controls
→
Sequencing Controls
menu (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
cascade. Refer to section 2.11.12.2 for wiring information and Section 7:
Boiler Sequencing
Technology
in the
Benchmark 750-6000 with Edge [i] Operation-Maintenance Manual
(OMM-
0145, GF-218)
for configuration instructions.
Sequencing Isolation Valve Installation Instructions
1. Install the sequencing isolation valve in the
boiler’s hot water outlet pipe.
Heating Pump
Pump Relay Terminals
(Orange)
–
N/O
(Yellow) -
COM
Contact Relay
(Supplied by Others)
N
H
POWER PUMP(S) FROM
INDEPENDENT FUSED
CIRCUITS
