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Benchmark 5000-6000 Boiler Installation & Startup Manual
SECTION 2: INSTALLATION
2.9 GAS SUPPLY PIPING
AERCO's Benchmark Gas Components and Supply Design Guide, TAG-0047 (GF-2030) must
be consulted prior to designing or installing any gas supply piping.
WARNING!
NEVER USE MATCHES, CANDLES, FLAMES OR OTHER SOURCES OF IGNITION TO
CHECK FOR GAS LEAKS.
CAUTION!
Many of the soaps used for gas pipe leak testing are corrosive to metals. Therefore, piping
must be rinsed thoroughly with clean water after leak checks have been completed.
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.
Natural Gas Piping
2" (5.08 cm) in back of unit
3" (7.62 cm) LGP units, in back of unit
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. A thorough leak test of all external piping must be performed using a soap and water
solution or suitable equivalent. The gas piping used must meet all applicable codes.
2.9.1 Gas Supply Specifications
AERCO Benchmark Low NOx series boilers require a stable natural gas and propane input pressure. It
must comply with the allowable gas inlet pressure range specified in the Benchmark Pre-Installation Gas
Supply Guide (TAG-0047, GF-2030).
2.9.2 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 2-10.
2.9.3 External Gas Supply Regulator
An external gas pressure regulator is required on the gas inlet piping under most conditions (see sections
2.9.3.1 and 2.9.3.2, below). Regulators must conform to the following specifications:
An external gas pressure regulator is required on the gas inlet piping under most conditions.
Regulators must conform to the following specifications:
OMM-0123_E • GF-207 • 12/17/2019
Propane Piping
1-1/2" (3.81 cm) on top of unit
Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST
Page 22 of 95
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