Listed vent cap
 Vent connector
 Establish a one foot rise before any elbows
[A] Gas vent
Gas piping & connections
Before connecting the gas supply, check the rating plate on the
right side of the heater to be sure that the heater is rated for the
same gas to which it will be connected.
In the United States: The installation must conform with local
codes or, in the absence of local codes, the National Fuel Gas
Code ANSI Z223.1/NFPA 54.
In Canada: The Installation should conform to CGA B149
INSTALLATION CODES and/or local installation codes.
Mount regulator to gas inlet pipe as shown in Fig. 12. The arrow
on the back of the regulator indicates the direction of gas flow
and should point toward the appliance.
Installation of Gas Pressure Regulator
Note: The 330 PN comes with a gas pressure regulator. Failure
to install or altering the gas pressure regulator will be a violation
of CSA certification of the unit. The regulator supplied with the
heater is preset for the gas shown on the rating plate to the
correct pressure. It is an appliance level regulator designed for
(low inlet) pressure (less than 1/2 Psig or 14" W.C.).
▶ DO NOT connect to an unregulated or
high pressure propane line or to a high
pressure commercial natural gas line.
▶ The heater must be isolated from the gas
supply piping system during any
pressure testing of that system at test
pressures equal to or more than 0.5
psig. If overpressure has occurred, such
as through improper testing of the gas
lines or malfunction of the supply
system, the gas valve must be checked
for safe operation.
▶ Install a manual gas shut off valve, on the gas supply line.
▶ Install a union when connecting gas supply.
▶ Attach the appliance regulator to the inlet gas pipe.
▶ The minimum diameter required for any appliance
connector used is ½ ".
▶ National Fuel Gas Code requires that a sediment trap (drip
leg) be installed on gas appliances not so equipped. The
drip leg must be accessible and not subject to freezing
conditions. Install in accordance with the
recommendations of the serving gas supplier.
Installation instructions | 15
6 720 644 951 (2014/11)