AM Series Boiler & Water Heater User Manual
CHAPTER 7: INSTALLATION
– NATURAL GAS
OMM-0100_E
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GF-146
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11/15/2019
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SECTION 7:
INSTALLATION – NATURAL GAS
7.1 Gas Supply Piping
Check that the type and the pressure of the gas supplied correspond with those required for the
heater as stated on the rating plate. Never use a gas different than that stated on the heater
rating plate.
A lockup style regulator is required on each unit any time the gas supply pressure may exceed
13” W.C. If gas supply pressure is between 3” and 13” individual regulators are recommended
on every unit but not required.
NOTE:
For installation in Massachusetts an individual gas regulator is required on every unit
regardless of incoming gas pressure.
7.2 Connection of Gas Supply Piping
Connect the gas supply to the unit as follows:
Connecting the Gas Supply to the Unit
1.
Refer to Figure 7-1 for connections necessary to pipe gas to the unit.
a) Install ground joint union for servicing, when required.
b) Install a manual shutoff valve in the gas supply piping.
c) Manual main shutoff valves must be identified as such by the installer.
2.
Install a sediment trap / drip leg. (see Figure 7-1).
3.
Support piping with hangers, and not from the unit or its accessories.
Figure 7-1: Gas Supply Piping Connections
