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9.
Gas Piping
The guidelines and examples we have 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.
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, obtain a replacement unit with
the proper gas type. If a gas type conversion must be made, there are conversion kits available for
some 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.]
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 btuh demand of all gas appliances in the building.
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. Sup-
plied gas pressure must be within the limits shown in the specifications section with all gas appliances operat-
ing. The inlet gas pressure must be within the range specified. This is for the purposes of input adjust-
ment. 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 9/32" hex head/Philips screw from the tap, and connect
a manometer using a silicon tube. Open up at least 2 fixtures and hold in the
maximum manifold pressure button on the circuit board. Please call Noritz for
details.
20
Follow the instructions from the gas supplier.
CAUTION
CAUTION
WARNING
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