AERCO Modulex EXT 321 - 1123 - Manual (Page 37)

MODULEX EXT 321, 481, 641, 802, 962, 1123 BOILERS
Installation, Operation & Maintenance Manual
WARNING!
• THE GAS CONNECTION MUST BE INSTALLED BY A
REGISTERED ENGINEER WHO MUST COMPLY WITH THE
REGULATIONS IN FORCE AND TO THE REQUIREMENTS
INDICATED BY THE LOCAL GAS SUPPLIER. AN
INCORRECT INSTALLATION CAN CAUSE INJURY OR
DEATH TO PERSONS, ANIMALS OR DAMAGE TO
PROPERTY. THE MANUFACTURER SHALL NOT BE HELD
LIABLE FOR ANY INJURY AND/OR DAMAGE DUE TO
INAPPROPRIATE INSTALLATION.
• Do not use the boiler for another type of gas than indicated on
the identification plate of the boiler. This will cause improper
functioning and can damage the boiler.
• Always check the safety of the gas pipe system by means of a
soap bubble test using a leak-search spray.
Natural Gas Connections 3.9.1
3.9.1.1 Natural Gas Piping Sizes
Contact your local gas supplier for natural gas pipe sizes and meter types.
3.9.1.2 Natural Gas Piping Connections
The boiler gas pipe is equipped with external 2” M-NPT thread, onto which the tail piece of
the gas shut off valve can be connected. Use appropriate sealing.
The connection to the boiler must include a suitable method of disconnection and a gas
control valve must be installed adjacent to the boiler for isolation purposes.
3.9.1.3 Natural Gas Supply Pressure Requirements
The nominal inlet working gas pressure measured at the boiler should be 7” W.C. (18 mbar)
for Natural Gas (Gas A). Maximum pressure with no flow (lockup) or with the boiler running is
10.5 inches W.C. Minimum pressure with the gas flowing (verify during boiler startup) is 4.0
inches W.C.
Propane Gas Connections 3.9.2
3.9.2.1 Propane Gas Piping Sizes
Contact your local gas supplier for Propane gas pipe sizes, tanks, and 100% lockup gas
pressure regulator.
3.9.2.2 Propane Gas Piping Connections
• Use a gas shut off valve compatible with propane gases.
• A sediment trap must be installed upstream of the gas controls.
The boiler pipe is provided with an external 2” MNPT thread, onto which the tail piece of the
gas shut off valve can be screwed. Use appropriate sealing.
The connection to the boiler must include a suitable method of disconnection.
The nominal inlet working gas pressure measured at the boiler should be 11” W.C. (27 mbar)
for Propane gas (Gas E).
OMM-0087_0E AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 37 of 148
GF-143 Phone: 800-526-0288 12/01/14