Gas Supply - Rheem Residential Indoor Gas Tankless Water Heater Use And Care Manual

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.
WARNING: Never use
an open flame to test for
gas leaks, as property
damage, personal injury, or
death could result.
WARNING: Install a
gas pressure regulator, in
the gas supply line, which
does not exceed the
maximum supply pressure.
DO NOT use an industrial
type gas regulator.
11

Gas Supply

The supplied Manual Gas Appliance
Shutoff Valve must be installed at the gas
connection of the water heater at the time
of installation (see diagram to the left).
The branch gas supply line to the water
heater should be clean 3/4
pipe or other approved gas piping
material.
A ground joint 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 .
If lever type gas shut offs are used, they
shall be T-Handle type.
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 gas shut-off valve(s) to
the water heater.
Pressure Testing the Gas Supply System
The water heater and its manual gas shutoff
valve must be disconnected
gas supply piping system during any
pressure testing of the system at
pressures in excess of 1/2 psi (14 w.c.).
High Altitude
Ratings of gas appliances are based on
sea level operation and need not be
changed for installations at elevations up
to 3,000 feet.
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.
A sediment trap should be installed at the
black steel
bottom of the gas line.
Do not use excessive force (over 31.5 ft
lbs.) in tightening the pipe, particularly if
teflon pipe compound is used, as the unit
may be damaged.
The inlet gas pressure to the water heater
must not exceed 10.5 w.c. for natural or
14 wc 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.
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 should also
be leak tested after the water heater
is placed in operation.
The water heater must be
from the the gas piping system by closing the
manual gas shut-off valve during any
pressure testing of the gas supply
piping at pressures equal to or less than
1/2 psi (14 w.c.) .
NOTICE: For installations above 3,280
feet, the connector on the PC board
must be replaced for High Altitude
installations. Please contact your local
distributor, dealer, or Rheem for
replacement connector.
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