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All installations must be vented in accordance with National Fuel
Gas Code NFPA 54/ANSI Z223.1—latest edition. In Canada, the
furnaces must be vented in accordance with the National
Standard of Canada, CAN/CSA B149.1 and CAN/CSA B149.2—
latest editions and amendments.
NOTE: The vertical height of the Category I venting system must
be at least as great as the horizontal length of the venting system.
WARNING
To prevent possible personal injury or death, due to
asphyxiation, common venting with other manufacturer's
Goodman 67
induced draft appliances is not allowed.
The minimum vent diameter for the Category I venting system is
as shown in the Minimum Vent chart.
Minimum Vent
Model
Upflow
70
4" (10.2 cm)
90
4" (10.2 cm)
115
5" (12.7 cm)
Under some conditions, larger vents than those shown in the
Minimum Vent chart may be required or allowed. When an
existing furnace is removed from a venting system serving other
appliances, the venting system may be too large to properly vent
the remaining attached appliances.
Upflow or horizontal units are shipped with the induced draft
blower discharging from the top of the furnace. ("Top" is as
viewed for an upflow installation.) The induced draft blower can
be rotated 90 degrees with the Chimney Transition Bottom kit
(0270F01119) for Category I venting. For horizontal installations,
a 4" (10.2 cm) single-wall pipe can be used to extend the induced
draft blower outlet ¹⁄₂" (1.3 cm) beyond the furnace cabinet.
NOTE: This product is not designed for counterclockwise
induced draft blower rotation.
Vent the furnace in accordance with the National Fuel Gas Code
NFPA 54/ANSI Z223.1—latest edition. In Canada, vent the
furnace in accordance with the National Standard of Canada,
CAN/CSA B149.1 and CAN/CSA B149.2—latest editions and
amendments.
Venting—Furnace Installed in Horizontal Position
NOTE: This furnace is not design certified to be horizontally
vented through an exterior side wall.
The following describes an optional venting procedure when the
furance is installed in the horizontal left discharge position.
To rotate the induced draft blower clockwise, you will need to
purchase one chimney transition bottom kit (Part Number
0270F01119).
1. Disconnect electrical power from the furnace.
2. Disconnect the induced draft blower power leads, flue pipe
and pressure switch tubing.
3. Remove the round cutout from the right side of the wrapper.
4. Remove and save the 4 screws that fasten the induced draft
blower to the flue collector box.
5. Remove and save the 3 screws that hold the chimney
assembly to the induced draft blower.
6. Remove and save the 4 screws that fasten the chimney top to
7. Remove the chimney transition bottom from the transition
8. Install the chimney top with the 4 screws retained from Step
9. Remove the induced draft blower and install the new chimney
10. Rotate the induced draft blower 90 degrees to the right,
11. Secure the pipe to the chimney top from the front, top and
Counterflow
12. Reattach the induced draft blower using the 4 screws
4" (10.2 cm)
4" (10.2 cm)
4" (10.2 cm)
13. Reconnect the induced draft blower power leads.
14. Reconnect the remaining flue pipe and the pressure switch
15. Reconnect electrical power to the furnace.
NOTE: In a horizontal installation, the air conditioning coil must
be adequately supported by the proper brackets and supports.
Inadequate coil support can result in furnace cabinet distortion
and air leakage.
An exterior masonry chimney is defined as a "Masonry chimney
exposed to the outdoors on one or more sides below the roof
line." The ability to use a clay-lined masonry chimney depends on
a parameter not associated with interior chimneys. This variable
is the geographic location of the installation. Researchers have
discovered that the winter design temperatures have a direct
impact on the suitability of this type of venting. In most situations,
the existing masonry chimneys will require a properly-sized
metallic liner.
Counterflow units are shipped with the induced draft blower
discharging from the top (as viewed for a counterflow installation)
of the furnace.
Vent the furnace in accordance with the National Fuel Gas Code
NFPA 54/ANSI Z223.1—latest edition. In Canada, vent the
furnace in accordance with the National Standard of Canada,
CAN/CSA B149.1 AND CAN/CSA B149.2—latest editions and
amendments.
Never allow the products of combustion, including carbon
monoxide, to enter the return ductwork or circulation air
supply.
the chimney bottom.
bottom kit.
6 onto the new chimney transition bottom from the transition
bottom kit.
assembly to it using the 3 screws retained in Step 5.
feeding the flue pipe through the round cutout from the
outside of the wrapper, and fitting the blower onto the
chimney top assembly.
bottom using 3 screws. Rotate the induced draft blower to
properly orient the assembly.
NOTE: If the pipe section is less than 18" (45.7 cm), then
attach it directly to the chimney top on 3 sides, and feed it
through the round cutout from the inside of the wrapper.
retained in Step 4. Ensure that the gasket located between
the induced draft blower and collector box is rotated
accordingly.
NOTE: If the wires are not long enough, pull extra wire from
the wire bundle in the blower compartment.
tubing. Ensure that all wires and the pressure switch tubing
are at least 1" (2.5 cm) from the flue pipe, or any other hot
surface.
Category I Furnaces Only—Exterior Masonry
Chimneys
WARNING
Goodman 68
9
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