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Installation Instructions; Inspect Shipment; Plan Vent System - Whirlpool WFM18 Installation Instructions Manual

80% single-stage multispeed gas furnace
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Inspect Shipment

This furnace is shipped in one package, completely assembled
and wired. The indoor thermostat and accessories are shipped in
a separate carton when ordered.
Check the furnace rating plate to confirm specifications are
as ordered.
Upon receipt of the furnace, inspect it for possible shipping
damage. Examine the furnace inside the carton if the carton
is damaged.
If damage is found, it should be noted on the carrier's freight
bill. Damage claims should be filed with the carrier
immediately. Claims of shortages should be filed with the
seller within 5 days.
NOTE: If any damages are discovered and reported to the carrier,
do not install the furnace, because your claim may be denied.

Plan Vent System

Category I Venting—Vertical Venting
WARNING
Goodman 66
To prevent possible personal injury or death due to
asphyxiation, this furnace must be Category I vented.
Do not vent using Category III venting.
Provisions must be made for venting combustion
products outdoors through a proper venting system.
The length of flue pipe could be a limiting factor in
locating the furnace.
Category I Venting is venting at a non-positive pressure. A
furnace vented as Category I is considered a fan-assisted
appliance. The vent system does not have to be "gas tight."
NOTE: Single-stage gas furnaces with induced draft blowers
draw products of combustion through a heat exchanger allowing,
in some instances, common venting with natural draft appliances
(for example, water heaters).
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.
10

INSTALLATION INSTRUCTIONS

The minimum vent diameter for the Category I venting system is
as shown in the Minimum Vent chart.
Minimum Vent
Model
Upflow
45
4" (10.2 cm)
70
4" (10.2 cm)
90
4" (10.2 cm)
115
5" (12.7 cm)
140
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.
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-hand 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 the gasket located
between the induced draft blower and the collector box is
rotated accordingly.
Counterflow
4" (10.2 cm)
4" (10.2 cm)
4" (10.2 cm)
5" (12.7 cm)
N/A

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