E N G I N E E R I N G D A T A
G A S U N I T H E A T E R S / D U C T F U R N A C E S
LF24
UNIT HEATERS
Horizontal − 60 HZ
Bulletin No. 210000
July 2007
Supersedes June 2007
Steady State Efficiency − up to 80.5%
Input − 100,000 to 400,000 Btuh
Front View Back View
Tubular Heat Exchanger
MODEL NUMBER IDENTIFICATION
Nominal Gas Heat Input
100 = 100,000 Btuh
115 = 115,000 Btuh
145 = 145,000 Btuh
175 = 175,000 Btuh
200 = 200,000 Btuh
230 = 230,000 Btuh
250 = 250,000 Btuh
300 = 300,000 Btuh
345 = 345,000 Btuh
400 = 390,000 Btuh
A24
Series
LF
Unit Type
LF − Lennox Unit Heater
Heat Exchanger Type
A = Aluminized Steel Heat Exchanger
S = Stainless Steel Heat Exchanger
200−
FEATURES
CONTENTS
Dimensions Pages 4−5. . . . . . . . . . . . . . . . . . . . . . . . . . .
Features Pages 1−2. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Guide Specifications Pages 8−11. . . . . . . . . . . . . . . . . .
High Altitude Information Page 5. . . . . . . . . . . . . . . . . .
Installation Clearances Page 5. . . . . . . . . . . . . . . . . . . .
Model Number Identification Page 1. . . . . . . . . . . . . . .
Mounting Height Page 5. . . . . . . . . . . . . . . . . . . . . . . . . .
Optional Accessories Page 3−4. . . . . . . . . . . . . . . . . . .
Specifications Page 3−4. . . . . . . . . . . . . . . . . . . . . . . . . .
Throw Data Page 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maximum Horizontal Vent Lengths Page 5. . . . . . . . . .
EQUIPMENT Warranty
Heat exchanger − stainless steel − fifteen year limited
warranty, aluminized steel − ten year limited warranty.
All other covered components − one year limited warranty.
Refer to Lennox Equipment Limited Warranty certificate
included with equipment for details.
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