Gas Piping; Electrical Wiring - American Water Heater 300 Series Instruction Manual

GAS PIPING

Make sure gas supplied is same type listed on model rating plate. The
inlet gas pressure must not exceed 14 inch water column (3.5 kPa)
for natural and propane gas (L.P.). The minimum inlet gas pressure
shown on rating plate is that which will permit firing at rated input.
Schedule 40 Steel or Wrought Iron Pipe is the preferred material
for the gas line of this water heater. It is imperative to follow the
sizing recommendations in the latest version of the National Fuel
Gas Code if Corrugated Stainless Steel Tubing (CSST) is used as
the gas line for this water heater.
SEDIMENT TRAPS
A sediment trap shall be installed as close to the gas inlet of the
water heater as practical at the time of water heater installation.
The sediment trap shall be either a tee fitting with a capped nipple
in the bottom outlet or other device recognized as an effective
sediment trap.
Contaminants in the gas lines may cause improper operation of
the gas control valve that may result in fire or explosion. Before
attaching the gas line be sure that all gas pipe is clean on the
inside. To trap any dirt or foreign material in the gas supply line,
a sediment trap must be incorporated in the piping. The sediment
trap must be readily accessible. Install in accordance with the
Gas Piping section. Refer to the current edition of the National
Fuel Gas Code (ANSI Z223.1/NFPA 54) or the Natural Gas and
Propane Installation Code (CAN/CSA B149.1)
Use pipe joint compound or teflon tape marked as being resistant
to the action of petroleum [Propane (L.P.)] gases.
The water heater and its gas connection must be leak tested
before placing the water heater in operation.
The water heater and its individual Shut-off valve shall be
disconnected from the gas supply piping system during any
pressure testing of that system at test pressures in excess of 1/2
pound per square inch (3.5 kPa). It shall 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
at test pressures equal to or less than 1/2 pound per square inch
(3.5 kPa).

ELECTRICAL WIRING

All electrical work must be installed in accordance with the National
Electrical Code, ANSI/NFPA 70 or the Canadian Electrical Code,
CSA C22.1 and local requirements.
When installed, the water heater must be electrically grounded
in accordance with local codes or, in the absence of local codes,
with the National Electrical Code, ANSI/NFPA 70 or the Canadian
Electrical Code, CSA C22.1.
If any of the original wire as supplied with the water heater must
be replaced, it must be replaced with 105°C rated wiring or its
equivalent, except in the burner housing. In this case 200°C rated
wire must be used.
DEDICATED POWER WIRING AND BREAKERS
Dedicated power supply wires, neutral wires, ground wiring, and
dedicated circuit breakers often prevent electrical line noise and are
required when installing the water heater.
Note: This water heater should not be connected to an electrical
supply with a Ground Fault Circuit Interrupter (GFCI) or Arc Fault
Circuit Interrupter (AFCI) with Integral GFCI protection as defined in
NFPA 70, CSA C22.1 and UL 943.
POWER SUPPLY CONNECTIONS
Read the requirements for the Power Supply on page 18 before
connecting power.
The 120-VAC hot wire from the power supply must connect to the
black jumper wire or the "L1" terminal block location in the junction box
and the 120-VAC neutral wire must connect to the white jumper wire
or the "Neutral" terminal block location in the junction box for correct
polarity. See Figure 38 on page 39.
Power supply connections must be made as follows:
1. Turn off power at the water heater's enable/disable switch and
the breaker that supplies power to the water heater.
2. Remove the junction box cover. See Figure 1B (page 10) and
Figure 1C (page 11) for junction box location.
3. Connect the 120-VAC hot wire from the power supply to the
black jumper wire or the terminal block location marked "L1"
inside of the junction box located on top of the water heater. If
the black jumper wire is used, make the connection inside of the
junction box with a properly-sized wire nut. Wrap electrical tape
around the wire nut and wire end. See junction box Figure 38 on
page 39 and the wiring diagram Figure 47 on page 62.
4. NOTE: If electrical connection is made directly to terminal block
remove black jumper wire before making connection.
5. Connect the 120-VAC neutral wire from the power supply to the
white jumper wire or the terminal block location marked "Neutral"
inside of the junction box located on top of the water heater. If
the white jumper wire is used, make the connection inside of the
junction box with a properly sized wire nut and wrap electrical
tape around the wire nut and wire end. See junction box Figure
38 on page 39 and the wiring diagram Figure 47 on page 62.
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