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Duct Work Requirements; Electrical Requirements; Gas Supply Requirements; Venting Requirements - Whirlpool WFCU Installation Instructions Manual

90+ gas furnace
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Combustible Floor Installation (Counterflow Models only)
1. Furnace
2. Woven glass tape (between
flanges of outlet duct and
base assembly)
3. Base assembly

Duct Work Requirements

Install the conditioned air plenum, 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.
All air filters must be listed as Class 2 furnace air filters.

Electrical Requirements

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).
4. Combustible flooring
5. Leg
6. Supply plenum or coil cabinet
(not provided - accessory)
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 (35°C)
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 furnace wiring diagram for
specific connection information.
Proper polarity of the supply connections ("HOT" and
"NEUTRAL") must be observed to ensure that safety controls
provide the protection intended.

Gas Supply Requirements

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 codes and the regulations of the utility. Piping must be
of adequate size to prevent undue pressure drop. Consult the
local utility or gas supplier for complete details on special
requirements for sizing gas piping.
If local codes allow the use of a flexible gas appliance
connector, always use a new listed connector. Do not use a
connector which has previously serviced another gas

Venting Requirements

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
Unconfined Space
An unconfined space is defined as "a space whose volume is
more than 50 cubic feet per 1000 BTU per hour of the combined
input rating of all appliances installed in that space."
When a furnace is installed in an unconfined space in a building,
it can be assumed that the infiltration will be sufficient to supply
the required air.
If the furnace is installed in a ventilated attic or crawl space, it is
assumed that the air infiltration is sufficient to supply the required
combustion air. However, in a building of unusually tight
construction, additional outdoor air should be provided.
Confined Space
A confined space is defined as "a space whose volume is less
than 50 cubic feet per 1000 BTU per hour of the combined input
rating of all appliances installed in that space." Use Direct Vent
method. See "Plan Ventilation System."


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