44
45
Gas connection
Do not use piping with a diameter smaller than
the inlet diameter of the water heater.
After connecting the piping, check for gas leak-
age at the inlet.
Install a gas shutoff valve on the supply line.
Use approved gas piping materials.
Use removable connections or hex pipe.
Gas meter
Select a gas meter capable of supplying gas for the
water heater while also supplying gas to other gas
equipment.
Follow the instructions from the utility.
Gas valve
If gas is not available in the area where the
equipment is to be installed, or if the line is not
sized correctly, the gas line will need to be re-
worked for this water heater.
Gas pressure
Select gas piping with the appropriate diam-
eter and a proper gas meter in order to achieve
sufficient gas pressure at the inlet of the water
heater during maximum burning.
Natural Gas Pressure inlet
Min. 3.5" WC
Max. 10.5" WC
LP Gas Pressure inlet
Min. 8" WC
Max. 14" WC
7.
Gas piping
The appliance 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
psig (3.5 kPa).
The Appliance 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
psig (3.5 kPa).
The appliance and its gas connections must be leak tested before placing the appliance in operation.
1. Turn on gas supply.
2. Spray a 10:1 dishwater soap and water solution around all gas connections, and look for bubbles. If
bubble is present, disassemble and apply a liberal amount of sealant.
The inlet gas pressure must be within the range specified. This is for the purposes of input adjustment.
In order to choose the proper size for the gas line, consult local codes or the National Fuel Gas Code
ANSI Z223.1.
Size the air inlet according to the National Fuel
Gas Code, ANSI Z223.1.
On the left side it says : Area of Air Inlet and
100 square inches or more.
Be sure to provide an air inlet.
The air inlet needs to open to the outside air
from the room in which the water heater is used.
To install the water heater in a kitchen or a
room with a duct, a volume of air intake equiva-
lent to the volume of air going out through the
duct is needed, so as not to reduce the air
pressure in the room.
(When air pressure in the room is reduced,
the safety device on the water heater activates
and stops the heater operating.)
Observe the commercial gas equipment installation criteria and operation criteria.
Air inlet
19"
24"
10"
19"
10"
Summary of Contents for N-063
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