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Modulex Light Commericial Series
CHAPTER 4: Installation Instructions
The boiler and its individual shutoff valve must be disconnected from the gas supply piping
system during any pressure testing of that system at test pressures in excess of 1/2 PSI
(3.5kPa).
The boiler must be isolated from the gas supply piping system by closing its individual manual
shutoff valve during any pressure testing of the gas supply piping system at test pressures
equal to or less than 1/2 PSI (3.5 kPa).
WARNING!
•
THE GAS CONNECTION MUST BE INSTALLED BY A REGISTERED ENGINEER WHO
MUST
COMPLY
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.
4.10 NATURAL GAS CONNECTIONS
Contact your local gas supplier for natural gas pipe sizes and meter types.
4.10.1.1 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.
4.10.1.2 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.
4.11 PROPANE GAS CONNECTIONS
4.11.1.1 Propane Gas Piping Sizes
Contact your local gas supplier for Propane gas pipe sizes, tanks, and 100% lockup gas
pressure regulator.
4.11.1.2 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.
OMM-0087_J • GF-143 • 11/17/2020
WITH
THE
REGULATIONS
Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST
IN
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