Instruction manual

19
GROUND JOINT
PIPE UNION
MANUAL
SHUT OFF VALVE
(UPSTREAM FROM
GROUND JOINT
PIPE UNION)
H
EIGHT REQUIRED
BY LOCAL CODE
DRIP LEG
BURNERS
GAS VALVE
MANIFOLD
Figure 13 - General Furnace Layout
UPFLOW INSTALLATIONS
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
(Figures 14 & 16).
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 (Figures 15
& 17).
• 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.
Figure 14 - Gas Inlet Through Furnace Right Side
(Upflow)
Figure 15 - Gas Inlet Through Furnace Left Side
(Upflow)
Figure 16 - Gas Inlet Through Furnace Bottom Side
(Upflow)
Figure 17 - Gas Inlet Through Furnace Top Side
(Upflow)
COUNTERFLOW INSTALLATIONS
When the gas piping enters through the left side of the furnace, the
installer must supply a straight pipe to reach the exterior of the fur-
nace (Figure 18).
Figure 18 - Gas Inlet Through Left Side
(Counterflow)