Use And Care Manual

11
Pressure Testing the Gas Supply System
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
psi (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 psi (3.5 kPa).
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.
The branch gas supply line to the water
heater should be clean 1/2 in. black steel
pipe no more than 40 equivalent feet long
or other approved gas piping material.
An 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 National Fuel Gas
Code (NFGC) mandates a manual gas
shut-off valve: See (NFGC) for complete
instructions.
If flexible connectors are used, the
maximum length shall not exceed 36 in.
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 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 10.5 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.
WARNING: DO NOT attempt to convert this water heater for use with a different type of gas other than the
type shown on the rating plate. Such conversion could result in hazardous operating conditions.
Gas Supply