Benchmark 750-3000 Boiler Installation & Startup Manual
SECTION 2 – INSTALLATION
OMM-0121_D • GF-205 • 5/9/2019 Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST Page 43 of 122
NOTE:
When the Sequencing Isolation Valve is used, the AUX START ON DLY in the Configuration
menu must be set to 120 seconds (see Section 2.6: CONFIGURATION Menu, item 16, in the
Benchmark 750 – 3000 Operation and Maintenance Guide, OMM-0122 (GF-206)). The
Sequencing Isolation Valve control is only available when BST is enabled. Refer to section
2.11.12.2 (wiring) and Section 6: Boiler Sequencing Technology in this guide, and Section 2.6:
CONFIGURATION Menu in the Benchmark 750 – 3000 Operation and Maintenance Guide,
OMM-0122 (GF-206).
Sequencing Isolation Valve Installation Instructions
1. Install the sequencing isolation valve in the boiler’s hot water outlet pipe (Figure 2-15).
Figure 2-15: Sequencing Isolation Valve Installed
2. Find the unused black cable, coiled inside the unit’s enclosure. One end is connected to
the DELAYED INTERLOCK IN terminals in the I/O board, while the other end contains a
Molex connector with a cap containing a jumper wire inserted in it (this jumper wire allows
units that do not have a sequencing isolation valve to operate normally).
3. Remove the cap (with jumper wire attached) from the Molex connector and dispose of it.
Figure 2-16: Sequencing Isolation Valve Molex Connector and Jumper Wire
4. Plug the Molex connector into the sequencing isolation valve’s connector.
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