GC9C80 Installation Manual
20
•
piping. Where possible, use new pipe that is properly
chamfered, reamed, and free of burrs and chips. If old
pipe is used, be sure it is clean and free of rust, scale,
burrs, chips, and old pipe joint compound.
•
two threads.
•
• Install a drip leg to trap dirt and moisture before it can
enter the gas valve. The drip leg must be a minimum of
three inches long.
•
gage connection, immediately upstream of the gas
supply connection to the furnace.
• Always use a back-up wrench when making the
connection to the gas valve to keep it from turning. The
orientation of the gas valve on the manifold must be
maintained as shipped from the factory. Maximum torque
for the gas valve connection is 375 in-lbs; excessive
over-tightening may damage the gas valve.
•
unit within six feet of the unit. If a union is installed, the
• Tighten all joints securely.
•
following methods:
-
minum alloy tubing must not be used in exterior lo-
cations. In order to seal the grommet cabinet pene-
tration, rigid pipe must be used to reach the outside
of the cabinet. A semi-rigid connector to the gas pip-
ing may be used from there.
•
room as the furnace.
• Protect connectors and semirigid tubing against
physical and thermal damage when installed. Ensure
aluminum-alloy tubing and connectors are coated to
protect against external corrosion when in contact with
masonry, plaster, or insulation, or subjected to repeated
wetting by liquids such as water (except rain water),
detergents, or sewage.
The gas piping may enter the left or right side of the furnace
cabinet. The installer must supply rigid pipe long enough to
reach the outside of the cabinet to seal the grommet cabinet
penetration. A semi-rigid connector to the gas piping can be
used outside the cabinet per local codes. ½” NPT pipe and
-
shaped manifold, a 2” long nipple is required.
A semi-rigid connector to the gas piping can be used outside
-
cation of union and cabinet width. The union may be placed
inside or outside of the cabinet.
Alternate
Gas Line
Location
Gas Valve
Burners
Manual Shut Off Valve
(upstream from
ground joint
pipe union)
Drip Leg
Grommet
in Standard
Gas Line
Hole
*Ground
Joint
Pipe
Union
*Ground
Joint
Pipe
Union
*NOTE: Union may be inside furnace cabinet where allowed by local codes.
Manifold
Before placing unit in operation, leak test the unit and gas
connections.
water solution, an electronic combustible gas detector, or
other approved testing methods.
pressure may damage the gas valve and cause subsequent
piping system before pressure testing the supply piping sys-
tem with pressures in excess of ½ psig (3.48 kPa).
Isolate this unit from the gas supply piping system by closing
supply piping system with test pressures equal to or less
than ½ psig (3.48 kPA).