Instruction Manual

Benchmark 750/1000 Boiler Installation, Operation & Maintenance Manual
CHAPTER 2 – INSTALLATION
OMM-0082_0J AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 35 of 192
GF-130 Ph.: 800-526-0288 05/21/2014
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 boilers.
The implementation of BST, and the installation and use of this valve is optional.
The 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.
NOTE
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 10.
Installing Sequencing Isolation Valve
1. Install the sequencing isolation valve in the boiler’s hot water outlet pipe.
Figure 2-13: Sequencing Isolation Valve Installed
HOT WATER
OUTLET
SEQUENCING
ISOLATION VALVE