Gas Supply Piping; Gas Supply Specifications; External Gas Supply Regulator - Watts AERCO Benchmark BMK750 Installation And Start-Up Manual

Benchmark Platinum-Edge [ii]: Installation Manual
SECTION 2 – INSTALLATION

2.9 GAS SUPPLY PIPING

AERCO's Benchmark Gas 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.
BMK Model Natural Gas Piping
750 and 1000 1 inch (2.54 cm) in back of unit
1500 – 3000
2 inch (5.08 cm) on top of unit
4000 and 5000N 3 inch (7.62 cm) on top of unit
2 inch (5.08 cm) in back of unit
5000 and 6000
3-inch (7.62 cm) LGP 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, the unit must be isolated 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
Gas Supply Design Guide (TAG-0047, GF-2030).

2.9.2 External Gas Supply Regulator

An external gas pressure regulator is required on the gas inlet piping under most conditions
(see, below). Regulators must conform to the specifications in the Benchmark Gas Supply
Design Guide (TAG-0047, GF-2030).
• GF-210 •
OMM-136_G
Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST
8/20/2020
Propane Piping
1 inch (2.54 cm) in back of unit
1 inch (2.54 cm) on top of unit
1-1/2 inch (3.81 cm) on top of unit
1-1/2 inch (3.81 cm) on top of unit
.
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