AERCO BMK 1.5 LN July 2011 - Manual (Page 18)

CHAPTER 2: INSTALLATION
Page 18 of 152 PR2: 05/09/12
Benchmark 1.5LN Low NOx Boiler
Operation and Maintenance Manual
OMM-0041_0D
GF-120
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 • Ph: 800-526-0288
NOTE
All gas piping must be arranged so that it does not interfere with
removal of any covers, inhibit service/maintenance, or restrict
access between the unit and walls, or another unit.
A 1-1/2 inch gas inlet connection is located on the rear of the unit as shown in Figure 2-3.
Prior to installation, all pipes should be de-burred and internally cleared of any scale, metal
chips or other foreign particles. Do Not install any flexible connectors or unapproved gas
fittings. Piping must be supported from the floor, ceiling or walls only and must not be supported
by the unit.
A suitable piping compound, approved for use with natural gas, should be used. Any excess
must be wiped off to prevent clogging of components.
To avoid unit damage when pressure testing gas piping, isolate the unit from the gas supply
piping. At no time should the gas pressure applied to the unit exceed 14” W.C. Leak test all
external piping thoroughly using a soap and water solution or suitable equivalent. The gas
piping used must meet all applicable codes.
Gas Supply Specifications. 2.7.1
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.
Manual Gas Shutoff Valve 2.7.2
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.
External Gas Supply Regulator 2.7.3
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.