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UNIT HEATERS
" " ray ' LF25-125-400
LE • CIS CC;/i Unit Heaters
. BUILDING DIVISION 60 Hz
COMMERCIAL Bulletin No.210900
July 2021
PRODUCT SPECIFICATIONS Supersedes August 2020
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LF25-125-200 LF25-250-400
Single-Stage Heating Two-Stage Heating
Steady-State Efficiency - up to 83%
Input - 125,000 to 400,000 Btuh
MODEL NUMBER IDENTIFICATION a 4 r .>: x `
LF 25 - 200 A- 1
Unit Type 7 Minor Design Sequence
LF=Lennox Unit Heater 1 =1st Generation
2=2nd Generation
Series
Liti
Nominal Gas Heat Input Heat Exchanger Type
125=125,000 Btuh 1250=250,000 Btuh, A=Aluminized Steel
150=150,000 Btuh 1300=300,000 Btuh x S=Stainless Steel
175=175,000 Btuh 1350=350,000 Btuh
200=200,000 Btuh 1400=400,000 Btuh
CONTENTS WARRANTY AND APPROVALS
Dimensions-Accessories 9 WARRANTY
Dimensions-Unit 7 • Heat Exchanger-Stainless steel-fifteen year limited
Electrical Data 4 • Heat Exchanger-Aluminized steel-ten year limited
Features And Benefits 2 • All other covered components- Limited one year
Installation Clearances 6 APPROVALS
Model Number Identification 1 . CSA International certified
Optional Accessories Gas Heat 5 • Certified for natural or LPG/Propane gas.
Optional Accessories Order Separately 5 • ISO 9001 Registered Manufacturing Quality System
Specifications 4
Vent Kits And Accessories 10
SPECIFICATIONS LF25-250 to LF25-400
General Data Model No. -Stainless Steel LF25-2505 LF25-300S LF25-3505 LF25-400S
Model No.-Aluminized Steel LF25-250A LF25-300A LF25-350A LF25-400A
Heat Input Type 2 Stage 2 Stage 2 Stage 2 Stage
Heating Input Btuh High Heat 250,000 300,000 350,000 400,000
Performance Low Heat 162,500 195,000 225,000 254,000
Output Btuh-Natural 2nd Stage 207,500 246,000 290,500 328,000
Steady State Efficiency-Natural 83% 82% 83% 82%
Temperature Rise-°F 51 57 58 65
Connections Flue size-in. (round) 1 5 ' 5 2 6 2 6
Gas Piping Size-in. 3/4 3/4 3/4 3/4
Fan Data Number of fans 2 2 2 2
Fan Diameter-in. 16 16 18 18
Number of blades 4 4 5 5
Motor Output-hp (2) 1/5 (2) 1/5 (2) 1/3 (2) 1/3
Amps(total) 3.0(6.0) 3.0(6.0) 3.9(7.8) 3.9(7.8)
rpm 1075 1075 1075 1075
Air Volume-cfm 4000 4000 5500 5550
Weight Data Net Weight-lbs. (kg) 290(132) 310(141) 320(145) 360(163)
Shipping Weight-lbs. (kg) 310(141) 330(197) 340(154) 380(172)
ELECTRICAL DATA
Voltage 115 volts-60 hertz- 1 phase
Fan motor full load amps 8.0 8.0 11.0 11.0
Maximum overcurrent protection(MOCP) 15 15 15 15
OPTIONAL ACCESSORIES - ORDER SEPARATELY
Remote Diagnostic LED Kit 22C99 22C99 22C99 22C99
Discharge 30° 18K68 18K68 18K70 18K70
Nozzle 45° 18K81 18K81 18K83 18K83
60° 18K89 18K89 18K91 18K91
90° 18K99 18K99 18L06 18L06
1 1-3/4 in.x 2-3/4 in.rectangular(unit)to 5 in.diameter(flue)adaptor is furnished with unit for flue connection.
2 1-3/4 in.x 2-3/4 in.rectangular(unit)to 6 in.diameter(flue)adaptor is furnished with unit for flue connection.
OPTIONAL ACCESSORIES - GAS HEAT
NATURAL GAS TO LPG/PROPANE CONVERSION KITS
US CANADA
Model No. LF25-125-to-200 LF25-250 to-400 Model No. LF25-125-to-200 LF25-250 to-400
0-3000 ft. 18L12 19K27 0-4500 ft. 18L12 19K27
3001-5000 ft. 18L12 19K28 4501-7500 ft. 18L12 19K28
5001-7000 ft. 19A51 19K30 7501-9500 ft. 19A51 19K30
7001-9000 ft. 19A51 19K31
9001-10,000 ft. 19A52 19K32
HIGH ALTITUDE CONVERSION KITS-NATURAL GAS ONLY
US CANADA
Model No. LF25-125-to-200 LF25-250 to-400 Model No. LF25-125-to-200 LF25-250 to-400
4001-5000 ft. 19A53 Factory 6501-7500 ft. 19A53 Factory
5001-8000 ft. 19A53 19K36 7501-9500 ft. 19A53 19K36
8001-10,000 ft. 19A54 19K44
HIGH ALTITUDE PRESSURE SWITCH KITS
Model No. LF25-125 LF25-150 LF25-175 LF25-200 LF25-250 LF25-300 LF25-350 LF25-400
0-3000 ft. Factory Factory Factory Factory Factory Factory Factory Factory
3001-4000 ft. Factory 20J44 Factory Factory Factory Factory Factory Factory
4001-5000 ft. 20J43 20J44 Factory 20J45 Factory Factory Factory Factory
5001-7000 ft. 20J43 20X67 Factory 20J45 20J44 20X67 Factory 20X65
7001-8000 ft. 20J42 20X67 20J43 20X66 20J44 20X67 20J42 20X65
8001-9000 ft. 20J42 20X65 20X67 20X66 20X66 20X65 20J42 20X63
9001-10,000 ft. 20X64 20X65 20X67 20X66 20X66 20X65 20J42 20X63
LF25-125-400 Unit Heaters/Page 5
HORIZONTAL VENT KITS AND ELBOW
Vent Upslope 45° Elbow 90° Elbow ' Minimum
Unit Heater Diameter Vent Kit Catalog Downslope Catalog Catalog Vent
Model No. Catalog No.
(in.) No. No. No. Length(ft.)
LF25-125 4 75W63 75W67 87W80 75W71 5
LF25-150 (Optional) (Optional)
LF25-175
LF25-200 87W81 75W72
LF25 250 5 75W64 75W68 (Optional) (Optional) 5
LF25-300
LF25-350 6 75W65 75W69 87W82 75W73 5
LF25-400 (Optional) (Optional)
'Length does not include termination(or elbow where applicable).NOTE-Elbow is required where shown to facilitate connection of horizontal vent kit to flue outlet.
STRAIGHT VENT PIPE - FOR HORIZONTAL VENTING
Unit Heater Vent Diameter(in.) Length(in.) Catalog No.
LF25-125 4 6 75W77
LF25-150 4 12 75W78
4 36 75W79
LF25-175 5 6 75W80
LF25-200 5 12 75W81
LF25-250
LF25-300 5 36 75W82
LF25-350 6 12 75W83
LF25-400 6 36 75W84
THROW DATA ' RECOMMENDED MOUNTING HEIGHT
Model No. ' Effective Throw Model No. Feet
feet LF25-125, LF25-150 8-16
LF25-125, LF25-150 50 LF25-175, LF25-200 8-20
LF25-175, LF25-200 60 LF25-250, LF25-300 12-26
LF25-250, LF25-300 70 LF25-350, LF25-400 12-28
LF25-350, LF25-400 80 I Recommended maximum mounting height from floor to bottom of unit.At
NOTE-Adjustable horizontal louvers on unit allow a variation in throw and spread. heights greater than shown air throw distance and air temperature at floor level
is affected.
'Throw terminates where velocity reaches 50 ft.per minute.
INSTALLATION CLEARANCES PPP MAXIMUM HORIZONTAL VENT LENGTHS
Top 6 inches 152 mm LF25-125, LF25-150,
Sides 18 inches 457 mm No.of LF25-175, LF25-200, LF25-250, LF25-300
Elbows LF25-350, LF25-400
Rear 18 inches 457 mm Feet Feet
Bottom 1 inch 25 mm 1 25 35
Flue 6 inches 152 mm 2 20 30
NOTE-Allow 24 in.(610 mm)for servicing and control box access on the control 3 15 25
box side of the unit.
4 10 20
See Installation Instructions for further installation considerations 5 5 15
6 --- 10
7 --- 5
LF25-125-400 Unit Heaters/Page 6
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DIMENSIONS UNIT LF25-250-300-350-400 (DUAL FANS)
+-16(406) 10-1/2 3
(267) (76)
5-3/8
—.(137)'.—
1/2(13)
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FLUE OUTLET
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Milso•- 1/2(13) ° m yI 3-1/8(79)
(4)3/8-16 MOUNTING NUTS f
FOR UNIT SUSPENSION ••-2 5/8(67)
ELECTRICAL AND THERMOSTAT
TOP VIEW WIRING INLETS
A
ADJUSTABLE 31-7/8(810)— 1 10-5/8
(270) COMBUSTION AIR
INDUCER
• 1 £ LOUVERS • . •
f F
f
DIRECT DRIVE FAN
F F .
f F 35-1/4 . ,- III
f F ` (895) AIR • 'II
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f f 'FLOW III
f F II.
f F . 1 ;4
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F f
'• I.* • GAS VALVE
• HEAT ` of
FRONT FRONT VIEW SIDE VIEW
Model A B C
No. in. mm in. mm in. mm
LF25-250 37-5/8 956 36-1/2 927 15-7/8 403
LF25-300
LF25-350 47 1194 45-3/4 1162 20-1/2 521
LF25-400