AERCO BMK 1.5 LN October 2012 - Manual (Page 19)

CHAPTER 2
INSTALLATION
PR1: 10/18//12 AERCO International Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 • Ph: 800-526-0288 Page 19 of 166
GF-120
OMM-0041 0E
Benchmark 1.5LN Low NOx Boiler
Installation, Operation and Maintenance Manual
2.7.1 Gas Supply Specifications.
The gas supply input specifications to the unit for Natural Gas are as follows:
• The maximum static pressure to the unit must not exceed 14” W.C.
• The gas supply pressure to the unit must be of sufficient capacity to provide 1500 cfh
while maintaining the gas pressure at 4.0 inches W.C. for FM, or 4.2 inches W.C. for IRI
gas trains.
2.7.2 Manual Gas Shutoff Valve
A manual shut-off valve must be installed in the gas supply line upstream of the Boiler as shown
in Figure 2-6. Maximum allowable gas pressure to the Boiler is 14” W.C.
NOTE
Paragraph 2.7.3 applies only to bolier installations within the
Commonwealth of Massachusetts.
2.7.3 External Gas Supply Regulator
For Massachusetts installations, a mandatory external gas supply regulator must be positioned
as shown in Figure 2-6. The gas supply regulator must be properly vented to outdoors. Consult
the local gas utility for detailed requirements concerning venting of the the supply gas regulator.
NOTE
The external regulator must be capable of regulating 1,500,000
BTU/HR of natural gas while maintaining a gas pressure of 4.0”
W.C. to the boiler.
CAUTION
A lock-up style regulator MUST be used when gas supply
pressure will exceed 14” W.C.