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Gas Piping
Chapter 4. – Installation
4-3. Gas Piping
In order to choose the proper size for the gas line, consult local codes
or the National Fuel Gas Code ANSI Z223.1, CAN/CGA B149.1.
The guidelines and examples provided in this manual section are for reference only.
The sizing and installation of the gas system for this water heater, as with any gas appliance, is the sole responsibility of the
installer. The installer must be professionally trained to do such work and must always follow all local and national codes
and regulations. Gas line sizing calculations must be performed for every installation. Please contact Noritz America at
866-766-7489 if you have any questions or concerns.
Regulators
Ensure that all gas regulators used are operating properly and providing gas pressures within the specified range of the
water heater being installed. Excess gas inlet pressure may cause serious accidents.
Pressure
Check the gas supply pressure immediately upstream at a location provided by the gas company. Supplied gas pressure
must be within the limits shown in the specifications section with all gas appliances operating. The inlet gas pressure must
be within the range specified. This is for the purposes of input adjustment. Low gas pressure may cause a loss of flame or
ignition failure at other appliances in the home, which may result in unburned gas in the home. Serious accidents such as
fire or explosion may result.
Measuring Gas Pressure
In order to check the gas supply pressure to the unit, a tap is provided on the
gas inlet. Remove the round head philips screw from the tap, and connect a
manometer using a silicone tube.
In order to check the gas manifold pressure, a tap is provided on the gas valve
inside the unit. The pressure can be checked either by removing the screw and
connecting the appropriate pressure gauge.
Gas Type
The gas type indicated on the water heater rating plate (NG or LP) must match the type of gas being supplied to the water
heater.
Gas Conversions
If the gas type supplied does not match the gas type on the rating plate, contact your water heater supplier for a replacement
unit with the proper gas type. If a gas type conversion must be made, there are conversion kits available for these models.
[The conversion kit shall be installed by a qualified service agency in accordance with the manufacturer’s instructions and
all applicable codes and requirements of the authority having jurisdiction. The qualified service agency is responsible for
the proper installation of this kit. Improper installation of this kit will void the warranty. Conversion kits will only be shipped
directly to the Distributor or Agency performing the conversion.]
Meter
The gas meter must be sized properly for the water heater and other gas appliances to operate properly.
Select a gas meter capable of supplying the entire Btu/h demand of all gas appliances in the building.
CAUTION
CAUTION
CAUTION
