Whirlpool WGFBLT, Installation Instructions Manual

7

INSTALLATION INSTRUCTIONS

Inspect Shipment

This furnace is shipped in one package, completely assembled 
and wired. The thermostat is shipped in a separate carton when 
ordered.

■

Check the unit rating plate to confirm specifications are as 
ordered.

■

Upon receipt of equipment, carefully inspect it for possible 
shipping damage. Take special care to examine the unit 
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 unit as your claim may be denied.

Plan Vent System

Confined Space Installation—Direct Venting

■

If the furnace is installed in a confined space and all the air 
necessary for combustion is supplied to the furnace through 
an air intake pipe vented directly outside, the pipe size and 
materials used must conform to the specification listed in 
“Materials—Air Intake Pipe Only” later in this section.

Typical Installation—Vertical Vent with Outdoor Fresh Air

NOTE: One 90º elbow or two 45º elbows are the equivalent of 5 ft 
of pipe.

WARNING

Explosion Hazard

Furnace must be installed and serviced by a 
qualified person.

Examples of a qualified person include:

licensed heating personnel, 
authorized gas company personnel.

Read and follow all instructions provided for 
installation, adjustment, service, alteration, or 
maintenance.

Failure to follow these instructions can result in death, 
explosion, fire, or carbon monoxide poisoning.

Excessive Weight Hazard

Use two or more people to move and install furnace.

WARNING

Failure to do so can result in back or other injury.

A. Chimney or gas vent
B. Furnace

C. Air intake pipe

Inlet Pipe Specifications

Input—KBtu/h

Inlet Pipe Size

Inlet Pipe 
Total Length*

50

2"

65 ft

75 & 100

2"

30 ft

75, 100, 125 & 150

3"

65 ft

*The inlet air lengths listed are maximum “equivalent pipe 

lengths.”

A

C

6" Min.

12" Min.

PVC Inlet

Pipe

See Chart

Approved Vent

System

B

Keep inlet

away from

obstructions 

and maximum

snow level.

Max. 65 ft

Max. 65 ft*

6" Minimum

12" Minimum

Keep inlet
away from
obstructions
and maximum
snow level.

PVC Inlet
Pipe
See Chart

Approved Vent

System