Modulex Light Commercial Series
CHAPTER 4: Installation Instructions
OMM-0158_A
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Figure 4-14:
Caps and Plugs Used for Closing Up
Vacated Gas and Hydraulic Connection Openings
4.9 Gas Connection General Information
For natural gas connections, see section 4.10.1. For propane gas, refer to section 4.10.2.
The gas supply connection must comply with local regulations or, if such regulations do not exist,
with the National Fuel Gas Code,
ANSI Z223.1/NFPA 54
.
An external gas pressure regulator is mandatory for the State of Massachusetts, regardless of
supply pressure; for all other jurisdictions, a lock-up style regulator is required when supply
pressure is
greater than 10.5” W.C. (see Fig. 1). The regulator must be installed with at least 2
feet of pipe between the regulator and the unit gas inlet. The regulator discharge range must able
to maintain 3.5” W.C. Gas regulators are self-contained with tapped diaphragm vent ports allowing
the diaphragm to change its position. These vents typically require piping to the outside.
For Canada, the gas connection must comply with local regulations or, if such regulations do not
exist, with the
CAN/CSA-B149.1
- Natural Gas and Propane Installation Code.
Before installing the boiler, it is recommended that all the supply piping be thoroughly cleaned to
remove any residual grime which could compromise the boilers correct functioning.
As a safety measure against gas leaks, AERCO recommends installing a surveillance and
protective system made up of a gas leakage detector combined with an on-off solenoid valve on
the gas supply line.
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).
