User Guide

23
• Use joint compound or tape
compatible with natural gas
and propane.
• Leak test before operating
heater.
• Disconnect gas piping and
shut-off valve before pressure
testing system.
Fire and Explosion Hazard
WARNING
Use pipe joint compound or Tefl on
®
tape marked as being
resistant to the action of gases.
The appliance and its gas connection must be leak tested
before placing the appliance in operation.
The appliance and its individual shut-off valve should be
disconnected from the gas supply piping system during
any pressure testing of that system at test pressures in
excess of 1/2 psi. It should 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 psi.
Connecting gas piping to the gas control valve/thermostat
of water heater can be accomplished by either of two
methods shown in Figure 17 & Figure 18.
FLEX PIPE
(PROPERLY SIZED
FOR THE HEATER
INPUT RATE)
SEDIMENT
TRAP
GAS
CONTROL
VALVE
GROUND
JOINT
UNION
(OPTIONAL)
CAP
3”
MIN.
Figure 17
BLACK PIPE
SEDIMENT
TRAP
GAS
CONTROL
VALVE
GROUND
JOINT
UNION
(OPTIONAL)
CAP
3 in. MIN.
Figure 18
SEDIMENT TRAPS
• Contaminants in gas lines can
cause fire or explosion.
• Clean all gas piping before
installation.
• Install sediment trap in accor-
dance with NFPA 54.
Fire and Explosion Hazard
WARNING
Contaminants in the gas lines may cause improper
operation of the gas control valve/thermostat that may
result in fi re 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 (sometimes called a dirt leg) must be incorporated in
the piping. The sediment trap should be either a tee fi tting
with a capped nipple in the bottom outlet or other device
recognized as an effective sediment trap. If a tee fi tting is
used, it should be installed in conformance with one of the
methods of installation shown in Figure 17 & Figure 18.
Refer to the current edition of the “National Fuel Gas
Code”, ANSI Z223.1/NFPA 54.
HOT-WATER
OUTLET
COLD-
WATER
INLET
UNION
TEMPERATURE-
PRESSURE
RELIEF VALVE
DISCHARGE PIPE
(DO NOT CAP
OR PLUG)
6 in. MAX. AIR
GAP BELOW
DISCHARGE PIPE
METAL
DRAIN
PAN
FLOOR
DRAIN
DRAIN
VALVE
SHUT-OFF VALVE
SOME
COMPONENTS
NOT SHOWN
FOR CLARITY.
SIDE TAP
(OUTLET)
SIDE TAP
(INLET)
Figure 19