American Water Heater DCG - Manual (Page 14)

14
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 per-
formed in accordance with CAN/CSA-B149.1.
Note: If using a flexible gas connector, make sure its
rating tag matches or exceeds the input of the water
heater.
Tables 2, 3A, and 3B on page 15 provide a sizing
reference for commonly used gas pipe materials.
Consult the “National Fuel Gas Code” or “Natural Gas
and Propane Installation Code” for the recommended
gas pipe size of other materials. Follow the instructions
below and reference Figure 10 for gas piping installa-
tion.
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.
2. Install a drip leg as shown. The drip leg must be no
less than 3 inches (76mm) long for the accumula-
tion 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.
Figure 10: Gas Piping
Drip leg
Check with
local utility
for min. height
Ground
Joint
Union
Manual Gas
Shut-off Valve
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 a L.P. gas water heater to
a natural gas supply.
Failure to follow these instructions can
result in death, explosion, or carbon
monoxide poisoning.
Index