Use and Care Manual

37
7 Connecting the Gas Supply
Follow the instructions from the gas supplier.
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.
WARNING
Gas Type
The gas type indicated on the Water Heater’s rating
plate (NG or LP) must match the type of gas being
supplied to the Water Heater.
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.
Pressure Test
The appliance and its gas connections must be leak
tested before placing the appliance in operation.
• Test at test pressures equal to or less than ½ psi
(3.5 kPa).
• The appliance must be isolated from the gas
supply piping system by closing its individual
manual shut off valve during any pressure testing
of the gas supply piping system.
• If test pressures are in excess of 1/2 psi (3.5 kPa),
the appliance and its individual shut off valve
must be completely disconnected from the gas
supply piping system during the test process.
Gas Conversions
• If the supplied gas does not match the gas type
on the rating plate, contact your water heater
supplier for a replacement Water Heater with the
proper gas type.
• If a gas conversion is needed, 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 Noritz
America Limited Warranty.
Conversion kits will only be shipped directly to the
Distributor or Agency performing the conversion.
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.
Measuring Gas Pressure
In order to check the gas supply pressure to the
Water Heater, a tap is provided on the gas inlet.
1. Remove the 9/32 in. hex head
/Philips screw from the tap.
2. Connect a manometer using a silicon tube.
3. Open up at least two fixtures with hot water
side fully.
4. Hold in the “Maximum
Burner Set Button”
on the circuit board.
Maximum
Burner Set
Button
Circuit Board
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.
WARNING
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.
WARNING
Connecting the Gas Supply