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VIII Gas Piping
Gas piping to the boiler must be sized to deliver adequate gas for the boiler to fi re at the nameplate input at
an inlet pressure between the minimum and maximum values shown on the rating plate. For more information
on gas line sizing, consult the utility or the National Fuel Gas Code
The gas line is connected to the boiler using the 3/4” NPT female connection in the tailpiece shown in Figure
8.1. This tailpiece is supplied in the boiler’s fi tting package, along with the fi ber gasket shown.
Figure 8.2 shows the fi nished gas piping connection to the MWC boiler. A sediment trap must be installed
upstream of all gas controls. Install the factory provided manual shut-off valve outside the jacket with a ground
joint union as shown.
The boiler and its gas connection must be leak tested before placing the boiler in operation. When doing this,
the boiler and its individual shut-off must be disconnected from the rest of the system during any pressure
testing of that system at pressures in excess of 1/2 psi. When pressure testing the gas system at pressures of
1/2 psi or less, isolate the boiler from the gas supply system by closing its individual manual shut-off valve.
Figure 8.1: Gas Tailpiece Installation
ANSI Z223.1
Natural Gas and Propane Installation Code.
/NFPA 54 and/or CAN/CSA B 149.1