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E N G I N E E R I N G D A T A
Front View
MODEL NUMBER IDENTIFICATION
LF − Lennox Unit Heater
100 = 100,000 Btuh
115 = 115,000 Btuh
145 = 145,000 Btuh
175 = 175,000 Btuh
200 = 200,000 Btuh
FEATURES
CONTENTS
Dimensions
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Features
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Guide Specifications
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High Altitude Information
Installation Clearances
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Model Number Identification
Mounting Height
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Optional Accessories
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Specifications
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Throw Data
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Maximum Horizontal Vent Lengths
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
LF
Unit Type
Series
Nominal Gas Heat Input
230 = 230,000 Btuh
250 = 250,000 Btuh
300 = 300,000 Btuh
345 = 345,000 Btuh
400 = 390,000 Btuh
Pages 4−5
Pages 1−2
Pages 8−11
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Page 5
Page 5
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Page 1
Page 5
Page 3−4
Page 3−4
Page 5
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Page 5
Tubular Heat Exchanger
Steady State Efficiency − up to 80.5%
Input − 100,000 to 400,000 Btuh
24
−
200
A
Heat Exchanger Type
A = Aluminized Steel Heat Exchanger
S = Stainless Steel Heat Exchanger
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.
LF24
UNIT HEATERS
Horizontal − 60 HZ
Bulletin No. 210000
July 2007
Supersedes June 2007
Back View
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Table of Contents
Related Manuals for Lennox LF24
Summary of Contents for Lennox LF24
- Page 1 ....Pages 8−11 Refer to Lennox Equipment Limited Warranty certificate High Altitude Information ....
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Page 2: Heating System
Units may be vented horizontally or vertically. Installer has only to locate unit, make unit gas supply, flue, LF24 units are approved for installation with single wall electrical connections and mount thermostat to complete and type B−1 double wall vent pipe. -
Page 3: Electrical Data
2−1/8 x 4 in. diameter adaptor is furnished with unit for flue connection. 2−1/4 x 2−3/4 in. rectangular to 5 in. round adaptor is furnished with unit for flue connection. Required for proper unit operation at altitudes over 5501 feet above sea level. LF24 − 100,000 to 400,000 Btuh / Page 3... - Page 4 2−1/4 x 2−3/4 in. rectangular to 5 in. round adaptor is furnished with unit for flue connection. 2−1/4 x 2−3/4 in. rectangular to 6 in. round adaptor is furnished with unit for flue connection. LF24 − 100,000 to 400,000 Btuh / Page 4...
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Page 5: Installation Clearances
LF24−200 LF24−250 LF24−345 adjustment adjustment adjustment LF24−400 LF24−175 Combustion air inducer pressure switch must be replaced at altitudes from 2500−7500 ft. Order 10K73 pressure switch. LPG/Propane Manifold Pressure − in. w.c. Model 0−2000 ft. 2000−2500 ft. 2500−3500 ft. 3500−4500 ft. -
Page 6: Top View
DIMENSIONS − INCHES (MM) *7−5/8 NOTE − Single fan model shown, LF24−100−115−145−175 and −200. 3/8−16 RIVETNUTS (194) LF24−230−250−300−345 and −400 models have two fans. FOR UNIT SUSPENSION (13) NOTE − Two rivetnuts are furnished on Furnished on LF24−230, LF24−100−115 −145,−175 and −200 models. - Page 7 90_ Discharge Nozzle 23−1/2 30−7/8 (597) (784) 60 deg 28−3/4 31−3/4( (730) 25−3/16 806) 25−3/16 (640) (640) Model Usage LF24−100 18−1/4 LF24−115 LF24−145 LF24−175 21−1/4 LF24−200 LF24−230 LF24−250 LF24−300 39−1/4 LF24−345 LF24−400 LF24 − 100,000 to 400,000 Btuh / Page 7...
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Page 8: Guide Specifications
GUIDE SPECIFICATIONS This specification specifies [Lennox Industries LF24] gas−fired unit heaters. Revise specification section number and title below to suit project requirements, specification practices and section content. Refer to CSI MasterFormat for other section numbers and titles. This specification utilizes the Construction Specifications Institute (CSI) Manual of Practice, including MasterFormatt, SectionFormatt and PageFormatt. -
Page 9: Quality Assurance
Contract Documents. Specifier Note: Coordinate paragraph below with manufacturer’s warranty requirements. Warranty: Commencing on Date of Installation. Specifier Note: Refer to Lennox Equipment Limited Warranty certificate included with equipment for details. Heat Exchanger: a. Aluminized Steel: 10 years, limited (non−residential applications) b. - Page 10 Specifier Note: Wiring Junction box located inside the cabinet on LF24 models 030, 045, 060 and 075. Wiring Junction box mounted on the exterior of the cabinet on LF24 models 100, 115, 145, 175, 200, 230, 250, 300, 345, and 400.
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Page 11: Installation
Propeller type fan blade [Optional Accessories]: a. [Thermostat] Specifier Note: Air Flow Nozzles are only available on the LF24 models 100, 115, 145, 175, 200, 230, 250, 300, 345, and 400. b. [Airflow Nozzles:] [30° from horizontal] [45° from horizontal] [60°... - Page 12 Contact us at 1−800−4−LENNOX NOTE − Due to Lennox’ ongoing committment to quality, Specifications, Ratings and Dimensions subject to change without notice and without incurring liability. Improper installation, adjustment, alteration, service or maintenance can cause property damage or personal injury.
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