Lennox F8AUH User Manual
F8AUH
Gas Furnaces – Up-Flow / Horizontal
45,000 to 120,000 Btuh (13.2 to 35.2 kW) Heating Capacity
1 through 5 Tons (3.5 to 17.6 kW) Add-On Cooling
User’s Information Manual
503,995M
RETAIN THESE INSTRUCTIONS
FOR FUTURE REFERENCE
Table of Contents
Important Directions 2. . . . . . . . . . . . . . . . . . . . . . . . . . . Venting System Inspection 5. . . . . . . . . . . . . . . . . . . . .
Lighting Information and Operation 3. . . . . . . . . . . . . . Flame Rollout Safety Switches 5. . . . . . . . . . . . . . . . . .
Filters 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Safety Reminder 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Blower 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Safety Precautions 5. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Burner Flame 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Planned Service 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Model Number Identification
06/99
Supersedes 05/99
Furnace
AFUE
8 - 80%
9 - 90%
Generation
Configuration
UF - Up-Flow
DF - Down-Flow
HZ - Horizontal
MP- Multi-Position
DH- Downflow/Horizontal
UH- Up-Flow/Horizontal
Cabinet Color
L - Beige
G - Gray
B - Brown
R - Green
S - Silver
FBR 113270
Do not store or use gasoline or othĆ
er flammable vapors and liquids in
the vicinity of this or any other apĆ
pliance.
Installation and service must be
performed by a qualified installer,
service agency or the gas supplier.
V–24*F A8 *UH X–045 2
Gas Valve
2 - Two Stage Valve
Blank Ć Single Stage Valve
Btuh Input (kW)
045 - 45,000 (13.2)
060 - 60,000 (17.6)
075 - 75,000 (22.0)
100 - 100,000 (29.3)
120 - 120,000 (35.1)
Door Color
L - Beige
G - Gray
B - Brown
R - Green
S - Silver
NOTE - Shaded area denotes part of
model no. referenced in publication.
Blower Motor
V - Variable Speed Motor
Blank - MultiĆSpeed Motor
Options
X - Low NO
P - LPG/Propane Gas
S - Stainless Steel Heat Exchanger
Z - Stainless Steel Heat Exchanger/Low NO
Blank - No options
x
Additive Cooling (Nominal)
18 - 1.5 Ton ( kW)
24 - 2 Ton ( kW)
30 - 2.5 Ton ( kW)
36 - 3 Ton ( kW)
42 - 3.5 Ton ( kW)
48 - 4 Ton ( kW)
60 - 5 Ton ( kW)
WARNING
If the information in this manual is not
followed exactly, a fire or explosion
may result causing property damage,
personal injury or death.
WHAT TO DO IF YOU SMELL GAS:
Do not try to light any appliance.
Extinguish any open flames.
Do not touch any electrical switch; do not
use any phone in your building.
Immediately call your gas supplier from a
neighbor's phone. Follow the gas suppliĆ
er's instructions.
If you cannot reach your gas supplier, call
the fire department.
x
1
1999
PARTS IDENTIFICATION
4
1
2
3
WARNING
Product contains fiberglass wool.Disturbing the
insulation in this product during installation,
maintenance, or repair will expose you to fiberĆ
glass wool. Breathing this may cause lung canĆ
cer. (Fiberglass wool is known to the State of
California to cause cancer.)Fiberglass wool may
also cause respiratory, skin, and eye irritation.To
reduce exposure to this substance or for further
information, consult material safety data sheets
available from address shown below, or contact
your supervisor
P.O. Box 799900
Dallas, TX 75379-9900
1 - COMBUSTION AIR
BLOWER
5
6
7
2 - PRESSURE SWITCH
3 - BURNERS
4 - HEAT EXCHANGER
5 - GAS VALVE
6 - CONTROL BOARD
7 - BLOWER
CAUTION
Before attempting to perform any service or mainteĆ
nance, turn the electrical power to unit OFF at disĆ
connect switch.
IMPORTANT
Any additions, changes, or conversions required in
order for the appliance to satisfactorily meet the apĆ
plication needs must be made by a qualified service
technician using factory specified and approved
parts.
Important Directions
WARNING
If overheating occurs or if gas supply fails to shut
off, shut off the manual gas valve to the appliance
before shutting off electrical supply.
WARNING
Do not use this furnace if any part has been underĆ
water. Immediately call a qualified service techniĆ
cian to inspect the furnace and to replace any part
of the control system and any gas control which
has been under water.
1 - Keep the furnace area clear and free of combustible
material, gasoline, and other flammable vapors and liqĆ
uids. If installed in an insulated area, furnace must be
kept free of insulating material. Insulating material may
be combustible. Inspect furnace venting system to
make sure it is in place, physically sound, and without
holes, corrosion, or blockage. Inspect furnace return
air duct connection to ensure duct is sealed to the furĆ
nace and terminates outside the space containing the
furnace. Inspect the physical support of the furnace to
guarantee that it is sound without sagging, cracks or
gaps around base and it maintains seal between base
and support.
2
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