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Whirlpool WFM18 Installation Instructions Manual page 11

80% single-stage multispeed gas furnace


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11. Reconnect the induced draft blower power leads.
NOTE: If the wires are not long enough, pull extra wire from
the wire bundle in the blower compartment.
12. Reconnect the flue pipe and the pressure switch 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.
13. Reconnect electrical power to the furnace.
Counterflow units are shipped with the inducted 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
Never allow the products of combustion, including carbon
monoxide, to enter the return ductwork or circulation air
Goodman 68
Category I Furnaces Only—Exterior Masonry Chimneys
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
Goodman 69
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.
A. Crown
G. Second floor
B. Wash
H. First floor
C. Roof line
I. Water heater vent
D. Clay tile size: 8" x 8" x
12" (24.3 cm x 24.3 cm
J. Natural draft water
x 30.5 cm) (each x 24"
[61 cm] length)
K. Basement floor
E. Attic floor
L. Fan-assisted
F. ¹⁄₂ " to 1 " (1.3 cm to
forced air furnace
2.5 cm) air space
Checklist Summary
This checklist serves as a summary of the items to be checked
before venting an 80+ furnace into a masonry chimney. In
addition, we recommend that a qualified serviceman use this
checklist to perform a yearly inspection of the furnace venting
This checklist is only a summary. For detailed information on
each of the procedures mentioned, see the paragraph referenced
with each item.
This inspection is based upon a draft topical report, "Masonry
Chimney Inspection and Relining," issued by the Gas Research
Institute. While not yet finalized, we believe this report represents
the best information on this subject which is currently available.
M. Forced air furnace
vent connector
N. Clean out
O. Breech
P. Damper
Q. Throat
R. Clay tile size:
generally 12" x 12"
(30.5 cm x 30.5 cm)
(24" [61 cm] length)


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