6
8. The unit must be connected to the building piping
by one of the following methods:
• Rigid metallic pipe and fittings
• Semirigid metallic tubing and metallic fittings (Alu-
minum alloy tubing must not be used in exterior
locations)
• Listed gas appliance connectors used in accor-
dance with the terms of their listing that are com-
pletely in the same room as the equipment
• In the prior two methods above the connector or
tubing must be protected from physical and ther-
mal damage. Aluminum alloy tubing and connec-
tors must be coated to protect against external
corrosion when in contact with masonry, plaster
or insulation or are subject to repeated wettings
by liquids (water - not rain water, detergents or
sewage)
Manual
Shut-Off
Valve
Gas
Valve
Drip Leg
Ground Joint Union
(Installed Ahead Of Gas Valve)
Reduce coupling 1/2" x 1/8",
with 1/8" pipe plug to measure
line gas pressure.
Figure 2
Proper Piping Practice
Note: To route the gas line from the gas valve to the
gas access hole in the side of the unit, a field supplied
3-3/4 inch long pipe and elbow is required.
Checking The Gas Piping
CAUTION
To prevent personal injury or property
damage due to fire, the following instruc-
tions must be performed regarding gas
connections and pressure testing:
• The unit and its gas connections must
be leak tested before placing in opera-
tion. Because of the danger of explo-
sion or fire, never use a match or open
flame to test for leaks. Never exceed
specified pressures for testing. Higher
pressure may damage gas valve and
cause overfiring which may result in
heat failure.
• This unit and its shut-off valve must be
disconnected from the gas supply dur-
ing any pressure testing of that system
at test pressures in excess of 1/2 PSIG
(3.48 kPa).
• This unit must be isolated from the gas
supply system by closing its manual
shut-off valve during any pressure test-
ing of the gas supply piping system at
test pressures equal to or less than 1/2
PSIG (3.48kPa).
WARNING
To avoid personal injury or property dam-
age, be sure there is no open flame in the
vicinity during air bleeding procedure.
There will be air in the gas supply line after testing for
leaks on a new installation. Therefore, the air must be
bled from the line by cracking open the ground joint
union until pure gas is expelled. Tighten union and wait
for five minutes until all gas has been dissipated in the
air. Be certain there is no open flame in the vicinity
during air bleeding procedure. The unit is placed in
operation by closing the main electrical disconnect switch
for the unit.
Tanks And Piping for Propane Gas
Installations
WARNING
To prevent death, personal injury or prop-
erty damage due to fire or explosion
caused by a propane gas leak, install a
gas detecting warning device. Since rust
can reduce the level of odorant in pro-
pane gas, a gas detecting warning de-
vice is the only reliable way to detect a
propane gas leak. Contact a local pro-
pane gas supplier about installing a gas
detecting warning device.
IMPORTANT NOTE: Propane gas conversion
kits must be installed to convert units to pro-
pane gas. See Specification Sheet for kit part
number for this model.
All propane gas equipment must conform to the safety
standards of the National Board of Fire Underwriters
(See NBFU Manual 58).