AERCO BMK 6000 Dual Fuel - Manual (Page 24)

Benchmark 6000 DF Installation, Operation & Maintenance Manual
CHAPTER 2 – INSTALLATION
Page 24 of 219 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0096_0B
03/21/2014
Ph.: 800-526-0288
GF-141
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 DF units contain a 2 inch natural gas inlet and a 2 inch propane gas inlet 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 and propane, 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 both NATURAL GAS and PROPANE gas are
as follows:
• The maximum static pressure to the unit must not exceed 56 inches W.C. (2 psi).
• The gas supply 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 lines 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 on all Benchmark 6000 DF units.
NOTE
The external regulator must be capable of regulating 300,000 – 6,360,000
BTU/HR of natural gas while maintaining a gas pressure of 14” W.C. to the
unit while in operation.
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.