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9. 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 (Alumi-
num alloy tubing must not be used in exterior loca-
tions)
•
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
•
Protect connectors and semirigid tubing against
physical and thermal damage when installed. En-
sure aluminum-alloy tubing and connectors are
coated to protect against external corrosion when in
contact with masonry, plaster, or insulation, or sub-
jected to repeated wetting by liquids such as water
(except rain water), detergents, or sewage.
Inlet Piping
When the gas piping enters through the right side of the
furnace
, the installer must supply the following fittings
(starting from the gas valve):
• 90 degree elbows (2).
• Close nipple.
• Straight pipe to reach the exterior of the furnace.
A ground joint union, drip leg, and manual shutoff valve
must also be supplied by the installer. In some cases, the
installer may also need to supply a transition piece from
1/2" to another pipe size.
When the gas piping enters through the left side of the
furnace, the installer must supply the following fittings
(starting from the gas valve):
•
Straight pipe to reach the exterior of the furnace.
•
A ground joint union, drip leg, and manual shutoff valve
must also be supplied by the installer. In some cases,
the installer may also need to supply a transition piece
from 1/2 inch to another pipe size.
Gas Inlet Through Furnace Right Side
Gas Supply and Piping
Gas Inlet Through Furnace Left Side
Gas Inlet Through Furnace Bottom Side
Gas Inlet Through Furnace Top Side
