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Benchmark 2500DF-3000DF Installation, Operation & Maintenance Manual
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 the 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 and Propane Gas are as follows:
The maximum static pressure to the unit must not exceed 14" W.C. For both the BMK 3000DF and
2500DF, the gas supply piping and pressure to the unit must be of sufficient capacity to provide 3000 cfh
while maintaining the gas pressure at 8" W.C. minimum for Natural Gas, and 4" W.C. minimum for
Propane Gas.
2.8.2 Manual Gas Shutoff Valve
A manual shut-off valve must be installed on both natural gas and propane gas supply lines upstream of
the boiler as shown in Figure 2-7. Maximum allowable gas pressure to the boiler is 14" W.C.
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:
•
NATURAL GAS: The external natural gas regulator must be capable of regulating 150,000 –
3,180,000 BTU/HR of natural gas while maintaining a gas pressure of 8.0" W.C. minimum to the
unit.
•
PROPANE GAS: The external propane gas regulator must be capable of regulating 150,000 –
3,180,000 BTU/HR of natural gas while maintaining a gas pressure of 4.0" W.C. minimum to the
unit
•
A lock-up style regulator is recommended if the gas supply pressure will exceed 7" W.C. and is
REQUIRED if the gas supply pressure will exceed 14" W.C.
Massachusetts Installations Only
2.8.3.1
For Massachusetts installations, a mandatory external gas supply regulator must be positioned as shown
in Figure 2-7. 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.
All Installations (Except Massachusetts)
2.8.3.2
For multi-unit installations (other than Massachusetts) that EXCEED 7" W.C. gas pressure, a separate
external gas supply regulator, as shown in Figure 2-7, is highly recommended. No regulator is required
for gas pressures below 7" W.C. of pressure. Consult the local gas utility for detailed requirements
concerning venting of the supply gas regulator.
Page 22 of 234
05/21/2014
CHAPTER 2 – INSTALLATION
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913
Phone: 800-526-0288
OMM-0099_0A
GF-145
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