AERCO BMK 2.0 LN Natural Gas (SN G-11-1861 and above) - Manual (Page 21)

GF-123
Benchmark 2.0LN Low NOx Boiler
Chapter 2
OMM-0046_0E Installation, Operation and Maintenance Manual Installation
PR1 08/20/12 AERCO International Inc.● 100 Oritani Dr. ● Blauvelt, NY 10913. ● Ph: 800-526-0288 Page 21 of 170
2.7.1 Gas Supply Specifications.
The maximum static pressure to the unit must not exceed 14” W.C. The specifications for
natural gas and propane are as follows:
• Natural Gas: The gas supply pressure to the unit must be of sufficient capacity to provide
2000 cfh while maintaining the gas pressure at 4.0" W.C. for FM or 5.0" W.C. for IRI gas trains.
• Propane: The gas supply pressure to the unit must be of sufficient capacity to provide 800
cfh while maintaining the gas pressure at 4.0" W.C. for FM or 5.0" 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 boiler 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 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.
GAS
SUPPLY
DIRT
TRAP
2" MANUAL
SHUTOFF
VALVE
GAS PRESS.
REGULATOR
(REQUIRED FOR
MASSACHUSETTS
INSTALLATIONS)
Figure 2-6: Manual Gas Shut-Off Valve Location