AERCO BMK 1500-2000 - Manual (Page 22)

Benchmark 1500 - 2000 Boilers
CHAPTER 2 – INSTALLATION
Page 22 of 188 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0097_0D
Ph.: 800-526-0288
GF-142
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.
NEVER USE MATCHES, CANDLES, FLAMES OR OTHER
SOURCES OF IGNITION TO CHECK FOR GAS LEAKS
.
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 MBH and 2000 MBH units contain a 2 inch NPT 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. At no time should the gas pressure applied to the unit exceed 14” W.C. 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.
• The gas supply piping and pressure to the unit must be of sufficient capacity to provide
2000 cfh while maintaining the gas pressure at 6 inches W.C. for FM gas trains
operating at maximum capacity.
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.
WARNING
CAUTION