Specifications

GF-2030 Benchmark Series Boilers
TAG-0047_0G Gas Supply Design Guide
PR1 10/04/13 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, New York 10913 • Phone: [phone] Page 4 of 10
An external isolation valve must be installed at each Benchmark Low NOx boiler, as shown in Diagram 1. This isolation
valve is supplied with the boiler. For installations that have greater than 14.0” W.C. supply pressure, an external lock-
up type regulator must be installed downstream of the isolation valve. The lock-up type regulator(s) must be sized as
follows
Boiler Size (MBH)
Required CFH
750
750 – 850
1000
1000 – 1200
1500
1500 – 1750
2000
2000 – 2300
2500
2500 – 2850
3000
3000 – 3400
6000
6000 – 6500
External gas regulators are self-contained with tapped diaphragm vent ports allowing the diaphragm to change its
position as required. These vents typically require piping to the outside. For details, refer to the paragraph titled
“Venting of Gas Supply Regulators” on page 9 of this guide. The SSOV/Regulator in the gas train is factory piped
and does not require any vent piping.
AERCO BOILERS MUST BE ISOLATED FROM THE
SYSTEM WHEN LEAK TESTING.
Drip legs are typically required at the gas supply of each boiler to prevent any dirt, weld slag, or debris from entering the
boiler gas train inlet pipe. When multiple boilers are installed, some utilities and local codes require a full size drip leg
on the main gas supply line in addition to the drip leg at each unit. The bottom of the gas drip leg(s) should be
removable without disassembling any gas piping. The weight of the gas pipe should not be supported from the bottom
of the drip leg. The drip leg(s) should not be used to support any or part of the gas piping.
CAUTION