Benchmark 6000 Boiler Installation, Operation & Maintenance Manual
CHAPTER 2 – INSTALLATION
Page
24
of
210
AERCO International, Inc.
•
100 Oritani Dr.
•
Blauvelt, NY 10913
OMM-0086_0D
03/20/14
Ph.: 800-526-0288
GF-133
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.
Benchmark 6000 MBH units contain a 2 inch NPT gas inlet connection on the back of the unit as
shown in Figure 2-4.
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 56” W.C. (2 psig). Leak
test all external piping thoroughly using a soap and water solution or suitable equivalent. The gas
piping used must meet all applicable codes.
2.8.1 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 56 inches W.C. (2 psi).
•
The gas supply piping and pressure to the unit must be sufficient to provide 6000 cfh while
maintaining a gas pressure of 14 inches W.C. for FM gas trains
while in operation
.
2.8.2 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 2-8. Maximum allowable gas pressure to the boiler is 56” W.C. (2 psi).
2.8.3 External Gas Supply Regulator
An external gas pressure regulator is required on the gas inlet piping under most conditions (see
sections 2.8.3.1 and 2.8.3.2, below). Regulators must conform to the following specifications:
•
The external natural gas regulator must be capable of regulating 300,000 – 6,000,000
BTU/HR of natural gas while maintaining a gas pressure of 14” W.C. minimum to the unit.
•
A lock-up style regulator MUST be used when gas supply pressure will exceed 2 PSI.
2.8.3.1
Massachusetts Installations Only
For Massachusetts installations, a mandatory external gas supply regulator must be positioned
as shown in Figure 2-8. 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.
2.8.3.2
All Installations (Except Massachusetts)
For multi-unit installations (other than Massachusetts) that EXCEED 1 PSI gas pressure, a
separate external gas supply regulator, as shown in Figure 2-8, is highly recommended. No
regulator is required for gas pressures
below
1 PSI of pressure, but above 2 PSI it is
mandatory
. Consult the local gas utility for detailed requirements concerning venting of the
supply gas regulator.
