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19
GAS SUPPLY AND PIPING
Gas Requirements
Read the data plate to be sure the water heater is made
for the type of gas being used. This information will be
found on the data plate located on the front of the water
heater. If the information does not agree with the type of
gas available, do not install or operate the water heater.
Call your dealer.
Note: An odorant may be added by the gas supplier to
the gas used by this water heater. This odorant may fade
over an extended period of time. Do not depend upon this
odorant as an indication of leaking gas.
Gas Piping
The gas piping must be installed according to all local and
state codes or in absence of local and state codes with
the “National Fuel Gas Code”, ANSI Z223.1 (NFPA 54)-
latest edition. Canadian installations must be performed in
accordance with CAN/CGA-B149. Note: If using a fl exible
gas connector, make sure its rating tag matches or exceeds
the input of the water heater.
Tables 2, 3A, and 3B on page 20 are provided as a sizing
reference for commonly used gas pipe materials. Consult
the “National Fuel Gas Code” for the recommended gas
pipe size of other materials. Follow the instructions below
and reference fi gure 19 for gas piping installation.
1. Install a readily accessible manual shut-off valve in the
gas supply line as recommended by the local utility.
Know the location of this valve and how to turn off the
gas to this unit. Note: DO NOT pipe across clean-out
port (100 gal. only.)
2. Install a drip leg as shown. The drip leg must be no
less than 3 inches long for the accumulation of dirt,
foreign material and water droplets.
3. Install a ground joint union between the water heater
and the manual shut-off valve. This is to allow easy
servicing.
4. Turn the gas supply on and check for leaks. Use a
chloride-free soap and water solution (bubbles forming
indicate a leak) or other approved method.
Note: Units with BTU/Hr inputs of 175,000 and above must
have a minimum of 3/4” NPT gas pipe supplied to the water
heater.
Figure 19: Gas Piping Installation
Gas Pressure
Important: The gas supply pressure must not exceed the
maximum supply pressure as stated on the water heater’s
data plate. Minimum supply pressure should also be
maintained per the data plate.
Explosion Hazard
Use a new AGA or CSA approved gas
supply line.
Install a shut-off valve.
Do not connect a natural gas water
heater to a L.P. Gas Supply.
Do not connect an L.P. gas water heater
to a Natural Gas Supply.
Failure to follow these instructions can
result in death, explosion, or carbon
monoxide poisoning.