Lennox F8AUH series Service Manual page 3

Model No.
Input Btuh (kW)
Output Btuh (kW)

AFUE
California Seasonal Efficiency
Flue size connection dia. − in. (mm) round
Temperature rise range − _F (_C)
High static AGA/CGA cert. − in wg. (Pa)
Gas Piping Size IPS Nat. or LPG/propane
Blower wheel nominal Blower wheel nominal
diameter x width
Blower motor output − hp (W)
Nominal cooling Nominal cooling
that can be added
Shipping weight − lbs. (kg) 1 package
Electrical characteristics
OPTIONAL ACCESSORIES − Must Be Ordered Extra
Hanging Bracket Kit
High Altitude Pressure Switch Kits
LPG/propane kit
Sidewall Power Venting Kit
Twinning Kit
Up−Flow/Horizontal Filter and Filter Rack Kits
No. & size of filters − in. (mm)
*Variable Field.

Annual Fuel Utilization Efficiency based on US DOE test procedures and according to FTC labeling regulations. Isolated combustion system rating
for non−weatherized furnaces.
For proper operation at altitudes over 4500 ft. (1370 m).
Required for horizontal venting applications.
Polyurethane frame type filter is furnished with kit.
SPECIFICATIONS
F8AUH**−48−075 F8AUH**−48−100
F8AUH**−48−075X F8AUH**−48−100X
75,000 (22.0) 100,000 (29.3)
61,700 (18.1) 82,000 (24.0)
80.0%
76.3%
4 (102)
45 − 75 (25 − 42) 45 − 75 (25 − 42) 35 − 65 (19 − 36) 45 − 75 (25 − 42) 45 − 75 (25 − 42)
.50 (125)
1/2 (13)
in. 11 x 8
mm 279 x 203
1/2 (373)
Tons 2 thru 4
kW 7.0 thru 14.1 7.0 thru 14.1
140 (64)
120 volts − 60 hertz − 1 phase (less than 12 amps) All models
46J66
88J80
38K84
79J15
15L38
32J02 (single) 46J14 (single)
66K64 (ten)
(1) 16 x 20 x 1 (1) 20 x 20 x 1
(406 x 508 x 25) (508 x 508 x 25)
Page 3
F8AUH**−60−100
F8AUH**−60−100X
100,000 (29.3)
82,000 (24.0)
80.1% 80.0%
76.5% 77.0%
4 (102) 4 (102)
.50 (125) .65 (162)
1/2 (13) 1/2 (13)
12 x 8 12 x 9
305 x 203 305 x 229
1/2 (373) 3/4 (560)
2 thru 4 3.5 thru 6
12.3 thru 21.1
175 (79) 175 (79)
46J66 46J66
18L24 18L24
81J14 81J14
79J15 79J15
15L38 15L38
46J14 (single)
66K65 (ten) 66K65 (ten)
(1) 20 x 20 x 1
(508 x 508 x 25)
F8AUH**−60−120
F8AUH**−48−120
F8AUH**−60−120X
120,000 (35.2) 120,000 (35.2)
98,400 (28.8) 98,400 (28.8)
80.0% 80.1%
Not available 75.5%
4 (102) 4 (102)
.50 (125) .50 (125)
1/2 (13) 1/2 (13)
10 x 10 12 x 9
254 x 254 305 x 229
1/2 (373) 3/4 (560)
2 thru 4 3.5 thru 6
7.0 thru 14.1 12.3 thru 21.1
175 (79) 175 (79)
46J66 46J66
18L24 18L24
81J14 81J14
79J15 79J15
15L38 15L38
46J14 (single) 46J14 (single)
66K65 (ten) 66K65 (ten)
(1) 20 x 20 x 1 (1) 20 x 20 x 1
(508 x 508 x 25) (508 x 508 x 25)