Whirlpool WGFBLT, Installation Instructions Manual

5

Electrical Requirements

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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).

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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 rise).

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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 
information.

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Proper polarity of the supply connections (“HOT” and 
“NEUTRAL”) must be observed to be sure 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.”

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Gas supply piping should be installed in accordance with 
local 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 piping.

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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 
appliance.

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/NFPA 54 (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.

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 spillage of flue products into the living space, the 
formation of condensate, leakage, etc. See the “Carbon 
Monoxide Poisoning Hazard” for proper test procedure.

WARNING

Electrical Shock Hazard

Electrically ground furnace.

Connect ground wire to green ground screw.

Failure to do so can result in death or electrical shock.

WARNING:

CARBON MONOXIDE POISONING HAZARD

Failure to follow the steps outlined below for each 
appliance connected to the venting system being 
placed into operation could result in carbon monoxide 
poisoning or death.

The following steps shall be followed for each appliance 
connected to the venting system being placed into operation, 
while all other appliances connected to the venting system are 
not in operation:

1. Seal any unused openings in the venting system.

2. Inspect the venting system for proper size and horizontal 

pitch, as required in the National Fuel Gas Code, 
ANSI Z223.1/NFPA 54 or the CSA B149.1, Natural Gas and 
Propane Installation Codes and these instructions. 
Determine that there is no blockage or restriction, leakage, 
corrosion and other deficiencies which could cause an 
unsafe condition.

3. As far as practical, close all building doors and windows 

and all doors between the space in which the appliance(s) 
connected to the venting system are located and other 
spaces of the building.

4. Close fireplace dampers.

5. Turn on clothes dryers and any appliance not connected to 

the venting system. Turn on any exhaust fans, such as 
range hoods and bathroom exhausts, so they are operating 
at maximum speed. Do not operate a summer exhaust fan.

6. Follow the lighting instructions. Place the appliance being 

inspected into operation. Adjust the thermostat so 
appliance is operating continuously.

7. Test for spillage from draft hood equipped appliances at the 

draft hood relief opening after 5 minutes of main burner 
operation. Use the flame of a match or candle.

8. If improper venting is observed during any of the above 

tests, the venting system must be corrected in accordance 
with the National Fuel Gas Code, ANSI Z223.1/NFPA 54 
and/or CSA B149.1, Natural Gas and Propane Installation 
Codes.

9. After it has been determined that each appliance connected 

to the venting system properly vents when tested as 
outlined above, return doors, windows, exhaust fans, 
fireplace dampers and any other gas-fired burning 
appliances to their previous conditions of use.