Instructions / Assembly

12
Pressure Testing the Gas Supply System
The water heater and its manual gas
shut-off 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 psi (3.5 kPa).
The water heater must be isolated from
the gas piping system by closing the
manual gas shut-off valve during any
pressure testing of the gas supply piping
system at test pressures equal to or less
than 1/2 psi (3.5 kPa).
Gas Supply
Check the markings on the water heater’s
rating plate to be certain the type of gas
being furnished corresponds to that for
which the water heater is built. The water
heater can be converted from natural gas
to LP or vice versa. See the Conversion
Instructions section of this manual.
The branch gas supply line to the water
heater should be clean 1/2 in. black steel
pipe or other approved gas piping material.
A union or ANSI design certified semi-
rigid or flexible gas appliance connector
should be installed in the gas line close to
the water heater. The HUD code should be
followed for installation and location of a
manual shutoff valve.
If flexible connectors are used, the
maximum length shall not exceed
36 in.(91.4 cm) and must meet the
requirements in ANSI Z21.24 - Connectors
for Gas Appliances.
Compound used on the threaded joints of
the gas piping must be of the type resistant
to the action of LP gas. Use compound
sparingly on male threads only.
Where a sediment trap is not incorporated
as part of the appliance, a sediment trap
shall be installed downstream of the
equipment shutoff valve as close to the
inlet of the appliance as practical at the
time of the appliance 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.
DO NOT use excessive force (over 31.5 ft
lbs.) in tightening the pipe joint at the gas
control (thermostat) inlet, particularly if
teflon pipe compound is used, as the valve
body may be damaged.
The inlet gas pressure to the water heater
must not exceed 14 in. w.c. for natural gas,
or 14 in. w.c. for LP gas. For purposes of
input adjustment, the minimum inlet gas
pressure (with main burner on) is shown
on the water heater rating plate. If high or
low gas pressures are present, contact your
gas supplier for correction.
Leak Testing
The water heater and its gas connections
must be leak tested at normal operating
pressures before it is placed in operation.
Turn on the manual gas shut-off valve
near the water heater.
Use a soapy water solution to test for
leaks at all connections and fittings.
Bubbles indicate a gas leak that must
be corrected.
The factory connections to the gas
control (thermostat) should also be leak
tested after the water heater is placed in
operation.
WARNING:
Never use an open
flame to test for
gas leaks, as
property damage,
personal injury, or
death could result.
Installing the water heater
For increased energy efficiency, some
water heaters have been supplied with two
24 in. sections of pipe insulation.
Please install the insulation, according to
the illustrations above, that best meets your
requirements.
Typical vertical piping arrangement
Typical horizontal piping arrangement
Hot and Cold Pipe Insulation Installation