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Ductwork Requirements; Electrical Requirements; Gas Supply Requirements; Venting Requirements - Whirlpool WFAU Installation Instructions Manual

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Install all conditioned air plenums, ducts and air filters (if not
provided on the furnace) in accordance with NFPA 90B
Standard for the Installation of Warm Air Heating and Air-
Conditioning Systems (latest edition).
The furnace is provided with flanges for the connection of the
plenum and ducts.
Electrical Shock Hazard
Electrically ground furnace.
Connect ground wire to green ground screw.
Failure to do so can result in death or electrical shock.
The furnace must be grounded and wired in accordance with
local codes or, in the absence of local codes, with the
National Electrical Code ANSI/NFPA No. 70 (latest edition).
This furnace is equipped for use with Natural gas. A conversion
kit is required for use with propane. To order the correct
conversion kit, see "Accessories."
Gas supply piping should be installed in accordance with
local, state and national codes and the regulations of the
utility. Piping must be of adequate size to avoid undue
pressure drop. Consult the local utility or gas supplier for
complete details on special requirements for sizing gas
Adequate provisions for combustion air and ventilation of furnace
must be made. Refer to Section 5.3, "Air for Combustion and
Ventilation," of the National Fuel Gas Code, ANSI Z223.1/NFPA54
(latest edition), or applicable provisions of the local building
codes. For Category 1 furnaces, vent installations shall be in
accordance with parts 7 and 11 of the National Fuel Gas Code,
ANSI Z223.1/NFPA 54, the local building codes, and the furnace
and vent manufacturer's instructions.

Ductwork Requirements

All air filters must be listed as Class 2 furnace air filters.
All ductwork must be made of materials and insulated to
meet local, state and national codes. Ductwork installed
outdoors must be sealed, weatherproofed and protected
against physical damage. Caulking, flashing or other means
of adequately providing a permanent weather seal should be
used where duct penetrates a building or structure opening.

Electrical Requirements

In all instances, other than wiring for the thermostat, the
wiring to be done and any replacement of wire shall conform
with the temperature limitation for Type T wire (63°F [17ºC]
The line voltage supply should be routed through a readily
accessible disconnect located within sight of the furnace. A
junction box on the furnace side panel is provided for line
voltage connections. See the Wiring Connection Diagram in
the "Troubleshooting" section for specific connection
Proper polarity of the supply connections ("HOT" and
"NEUTRAL") must be observed to be sure that the control
system provides the protection intended.

Gas Supply Requirements

If local codes allow the use of a flexible gas appliance
connector, use a CSA design-certified outdoor flexible
stainless steel appliance connector or rigid gas supply line as
needed. Do not use a connector which has previously
serviced another gas appliance.

Venting Requirements

Existing Venting Systems
When an existing furnace is removed or replaced, the original
venting system may no longer be sized to properly vent the
attached appliances. An improperly sized venting system can
result in the spilling of flue products into the living space, the
formation of condensate, leakage, etc. See the "Carbon
Monoxide Poisoning Hazard" for proper test procedure.

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