Benchmark 1500 - 2000 Boilers
CHAPTER 2 – INSTALLATION
OMM-0097_0E AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 23 of 182
GF-142 Ph.: 800-526-0288 10/01/2015
2.8 GAS SUPPLY PIPING
The AERCO Benchmark Gas Components and Supply Design Guide, 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.
Benchmark 1500 and 2000 units contain a 2 inch (5.08 cm) NATURAL GAS inlet connection on
the top of the unit, as shown in Figure 2-2 and 2-3.
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. The gas pressure applied to the unit must never exceed 14” W.C. (3487 Pa). 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.
2.8.1 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 14” W.C. (3487 Pa)
• Supply piping and pressure to the unit must be sufficient to provide 2000 CFH (56.6
m
3
/hr) volume of gas while maintaining a gas pressure of 4” W.C. (996 Pa) while
operating at maximum capacity. However, the BMK 2000 may derate by up to 150,000
BTU’s when operated below 5” W.C. (1245 Pa) at full fire.
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 2-7. Maximum allowable gas pressure to the boiler is 14” W.C. (3487 Pa).
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