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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 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. 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
NOTE: This furnace is not design certified to be horizontally
vented.
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
the chimney bottom.
7. Remove the chimney transition bottom from the transition
bottom kit.
8. Install the chimney top with the 4 screws retained from Step
6 onto the new chimney transition bottom from the transition
bottom kit.
9. Install the chimney assembly with the 3 screws retained from
Step 5 onto the induced draft blower.
10. Reinstall the induced draft blower rotating it 90 degrees
clockwise from the original upflow configuration using the
4 screws retained in Step 3. Ensure that the gasket located
between the induced draft blower and the collector box is
rotated accordingly.
11. Reconnect the induced draft blower power leads.
12. Reconnect the flue pipe and the pressure switch tubing.
Counterflow
4" (10.2 cm)
13. Reconnect electrical power to the furnace.
Counterflow units are shipped with the inducted draft blower
4" (10.2 cm)
discharging from the top (as viewed for a counterflow installation)
of the furnace.
4" (10.2 cm)
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.
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.
Possiblility of property damage, personal injury or death.
Damaging condensation can occur inside masonry
chimneys when a single fan-assisted Category I appliance
(80% AFUE furnace) is vented without adequate dilution
air. Do not connect an 80% furnace to a masonry chimney
unless the furnace is common vented with a draft hood
equipped appliance or the chimney is lined with a metal
liner or Type B metal vent. All installations using masonry
chimneys must be sized in accordance with the
appropriate venting tables. If an 80% furnace is common
vented with a draft hood equipped appliance, the potential
for condensation damage may still exist with extremely
cold conditons, long vent connectors, exterior chimneys
or any combination of these conditions. The risk of
condensation damage is best avoided by using the
masonry chimney as a pathway for properly-sized metal
liner or Type B metal vent.
NOTE: If the wires are not long enough, pull extra wire from
the wire bundle in the blower compartment.
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.
WARNING
Category I Furnaces Only—Exterior Masonry
Chimneys
WARNING
Goodman 69
9
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