•
Install a 1/8” NPT pipe plug fitting, accessible for
test 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.
•
Install a manual shutoff valve between the gas meter
and unit within six feet of the unit. If a union is
installed, the union must be downstream of the
manual shutoff valve, between the shutoff valve and
the furnace.
•
Tighten all joints securely.
•
Connect the furnace to the building piping by one of
the following methods:
–
Rigid metallic pipe and fittings.
–
Semi-rigid metallic tubing and metallic fittings.
Aluminum alloy tubing must not be used in
exterior locations. In order to seal the grommet
cabinet penetration, rigid pipe must be used to
reach the outside of the cabinet. A semi-rigid
connector to the gas piping may be used from
there.
•
Use listed gas appliance connectors in accordance
with their instructions. Connectors must be fully in
the same 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. 1/2” NPT pipe and
fittings are required. For models with an “L” shaped man-
ifold, a 4 1/2” long nipple is required. For models with a
hook shaped manifold, a 2” long nipple is required.
A semi-rigid connector to the gas piping can be used outside
the cabinet per local codes. From the elbow, the length of
pipe and the fittings required will vary by the side chosen,
location of union and cabinet width. The union may be
placed inside or outside of the cabinet.