Modulex EXT Series Piping Application Guide
TAG-0096
AERCO International, Inc.
•
100 Oritani Dr.
•
Blauvelt, NY 10913
Page
3
of
7
Phone: 800-526-0288
10/06/2021
CAUTION!
The AERCO Modulex EXT boilers must be isolated from the system when leak testing.
Drip legs are typically required at the gas supply of each unit to prevent any dirt, weld slag, or debris
from entering the boiler gas train inlet pipe. When multiple units 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.
Figure 1: Single Boiler Gas Pipe Connections
GAS PRESSURE
REGULATOR
ISOLATION
SERVICE VALVE
NATURAL GAS SUPPLY LINE
DRIP LEG
MAINTAIN AT LEAST 3.5
”
W.C. NATURAL GAS
PRESSURE AT MAXIMUM
BTU/HR INPUT
