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Make sure the gas supplied is the same type listed on
the model rating plate. The inlet gas pressure must not
exceed 14 inch w.c. for natural gas and propane gas. The
minimum inlet gas pressure shown on the rating plate is
that which will permit firing at rated input.
All gas piping must comply with local codes and ordinances
or with the current edition of the "National Fuel Gas
Code", ANSI Z223.1/NFPA 54. Copper or brass tubing
and fittings must be certified for gas service.
If the gas control valve/thermostat is subjected to
pressures exceeding 1/2 psi, the damage to the gas
control valve/thermostat could result in a fire or explosion
from leaking gas.
If the main gas line shut-off serving all gas appliances is
used, also turn "OFF" the gas at each appliance. Leave
all gas appliances shut "OFF" until the water heater
installation is complete.
A gas line of sufficient size must be run to the water
heater. Consult the current edition of the "National Fuel
Gas Code", ANSI Z223.1/NFPA 54 and your gas supplier
concerning pipe size.
There must be:
•
A readily accessible manual shut-off valve in the gas
supply line serving the water heater, and
•
A sediment trap ahead of gas control valve/thermostat
to help prevent dirt and foreign materials from entering
the gas control valve/thermostat.
•
A flexible gas connector or ground joint union between
the shut-off valve and gas control valve/thermostat to
permit servicing of the unit.
Be sure to check all the gas piping for leaks before lighting
the water heater. Use a soapy water solution, not a match
or open flame. Repair and retest as required. When
finished, rinse off soapy solution and wipe dry.
WARNING
Fire and Explosion Hazard
• Use joint compound or tape
compatible with propane.
• Leak test before operating
heater.
• Disconnect gas piping and
shut-off valve before pressure
testing system.
Use pipe joint compound or Teflon 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
100221773_2000189439_Rev. 01
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 26 & Figure 27.
GROUND
JOINT
UNION
(OPTIONAL)
3" MIN.
3" MIN.
SEDIMENT TRAPS
Contaminants in the gas lines may cause improper
operation of the gas control valve/thermostat 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
should be either a tee fitting with a capped nipple in the
bottom outlet or other device recognized as an effective
sediment trap. If a tee fitting is used, it should be installed in
conformance with one of the methods of installation shown
in Figure 26 & Figure 27. Refer to the current edition of
the "National Fuel Gas Code", ANSI Z223.1/NFPA 54.
www. lochinvar .com
FLEX PIPE
(PROPERLY SIZED
FOR THE HEATER
INPUT RATE)
SEDIMENT
TRAP
CAP
Figure 26.
BLACK PIPE
SEDIMENT
TRAP
GROUND
JOINT
UNION
(OPTIONAL)
CAP
Figure 27.
WARNING
Fire and Explosion Hazard
• Contaminants in gas lines can
cause fire or explosion.
• Clean all gas piping before
installation.
• Install sediment trap in accor-
dance with NFPA 54.
GAS
CONTROL
VALVE
GAS
CONTROL
VALVE
25
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