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LF25
User Manual
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Lennox LF25 User Manual

agency or the gas supplier.
WARNING
Improper installation, adjustment, alteration, service or maintenance can cause property damage, personal injury or loss of life. Installation and service must be performed by a licensed professional installer (or equivalent), service agency or the gas supplier.
CAUTION
As with any mechanical equipment, personal injury can result from contact with sharp sheet metal edges. Be careful when you handle this equipment.
Table Of Contents
LF25-030/105 Compact Unit Dimensions.......................2
Compact Unit Parts Arrangement ...................................3
LF25-125/200 Standard Unit Dimensions ......................4
LF25-250/400 Standard Unit Dimensions ......................5
Standard Unit Parts Arrangement...................................6
Shipping..........................................................................7
Optional Accessory ......................................................... 7
Requirements in USA .....................................................7
Requirements in Canada ................................................ 7
Additional Requirements ................................................8
Unit Heater Installation ...................................................8
Combustion and Ventilation Air.......................................8
Rotation of Combustion Air Inducer - 125/150................9
Venting............................................................................9
INSTALLATION INSTRUCTIONS
LF25
30,000 to 400,000 Btuh Series
UNIT HEATERS
507930-01 8/2019 Supersedes 3/2019
Failure to ly could result in serious injury, death, or property damage.
Be sure to read and understand the
structions in this manual.
ation, service or maintenance can cause serious injury, death or property damage.
Do not store or use gasoline or other
cinity of this or any other appliance.
formed by a qualified installer, service
RETAIN THESE INSTRUCTIONS
FOR FUTURE REFERENCE
WARNING
FIRE OR EXPLOSION HAZARD.
WHAT TO DO IF YOU SMELL GAS:
Do not try to light any appliance. Do not touch any electrical switch; do not use
any phone in your building. Leave the building immediately. Immediately call your gas supplier from a neighbor's structions.
If you cannot reach your gas supplier, call the fire department.
Page 1
1/2 [13]
HANGING
BRACKETS (2)
8-3/4 (222)
2-3/4 (70)
AIR
FLOW
HEAT EXCHANGER
TOP VIEW
MOUNTING SLOTS (Typical) 5/16 x 3 Inches (8 x 76 mm)
10-1/2
(267)
ELECTRICAL
INLET
4-1/4 (108)
21
(533)
(25)
(25)
1
1
DIRECT
DRIVE FAN
Model
No.
LF25-030A LF25-045A
LF25-060A LF25-075A
LF25-090A LF25-105A
29
(737)
FLUE
OUTLET
BACK VIEW
3-5/8
(92)
1
(25)
A
C
GAS
INLET
B 21
SERVICE
ACCESS
PANEL
(533)
SIDE VIEW
HANGING BRACKETS (2)
ADJUSTABLE
LOUVERS
A B C
in. mm in. mm in. mm
12-3/8 314 6-1/2 165 3-7/8 98
17-1/2 445 6-1/4 159 6-1/8 156
23 584 7-7/8 200 9-1/8 232
Page 2
LF25 COMPACT UNIT HEATER PARTS ARRANGEMENT
030 / 105K BTUH
Page 3
LF25-125 / 200 DIMENSIONS - Inches (mm)
16 (406)
10-1/2
1/2 (13)
B
(267)
5-3/8 (137)
D
C
A
FRONT VIEW
35-1/4 (895)
ADJUSTABLE
LOUVERS
(4) 3/8-16 MOUNTING NUTS
FOR UNIT SUSPENSION
HEAT
EXCHANGER
AIR
FLOW
1/2 (13)
TOP VIEW
31-7/8 (810)
SIDE VIEW
3-1/8 (79)
2-1/2 (64)
ELECTRICAL INLETS
10-5/8
(270)
FLUE OUTLET
COMBUSTION AIR
INDUCER
DIRECT DRIVE FAN
GAS VALVE
Model
No.
LF25-125 LF25-150
LF25-175 LF25-200
A B C D
in. mm in. mm in. mm in. mm
19-1/2 495 18-1/2 470 12-1/4 311 4-3/4 121
25 635 23-3/4 603 9-1/2 241 3 76
Page 4
LF25-250 / 400 DIMENSIONS - Inches (mm)
16 (406)
10-1/2
(267)
1/2 (13)
B
5-3/8 (137)
(76)
3
C
FLUE OUTLET
Model
No.
LF25-250 LF25-300
LF25-350 LF25-400
A
FRONT VIEW
in. mm in. mm in. mm
37-5/8 956 36-1/2 927 15-7/8 403
47 1194 45-3/4 1162 20-1/2 521
(4) 3/8-16 MOUNTING NUTS
FOR UNIT SUSPENSION
1/2 (13)
3-1/8 (79)
2-5/8 (67)
ELECTRICAL INLETS
TOP VIEW
10-5/8
(270)
35-1/4 (895)
ADJUSTABLE
LOUVERS
EXCHANGER
31-7/8 (810)
AIR
FLOW
HEAT
SIDE VIEW
A B C
COMBUSTION AIR
INDUCER
DIRECT DRIVE FAN
GAS VALVE
Page 5
LF25 STANDARD UNIT HEATER PARTS ARRANGEMENT
125 / 400K BTUH
Page 6
Shipping
Shipping contents includes heater, installation in­structions, warranty certificate, 3D brand badge, two mounting brackets (shipped loose in LF25-30/105 units), and a flue transition (included in LF25­175/400 units only). The heater is shipped complete­ly assembled. Check the unit for shipping damage. The receiving party should contact the last carrier immediately if any shipping damage is found.
Optional Accessory
Units require a changeover kit when the unit is to be used with LP/propane gas. The kit is ordered separately. See Engineering Handbook.
Requirements in USA
Installation of gas unit heaters must conform with local building codes or, in the absence of local codes, with the current edition of ANSI Z223.1, National Fuel Gas Code. Installation in aircraft hangers must be in accordance with the current edition of ANSI/NFPA No. 409, Standard for Aircraft Hangers.
Installation in parking structures must be in accordance with the current edition of ANSI/NFPA No. 88A, Standard for Parking Structures.
Installation in repair garages must be in accordance with the current edition of ANSI/NFPA No. 88B, Standard for Repair Garages.
These units are approved for residential garage or
non-conned living space applications. For installation in a residential garage or non-conned living space, unit
must be installed so that burners and ignition source are
located no less than 18” (457mm) above oor. Heater
must be located or protected to avoid physical damage by vehicles. Refer to the current edition of ANSI Z223.1, National Fuel Gas Code.
Authorities having jurisdiction should be consulted before installation. Air for combustion and ventilation must con-
form to the methods outlined in the current edition of ANSI Z223.1, Section 5.3, Air for Combustion and Ventilation, or applicable provisions of local building codes.
The National Fuel Gas Code (ANSI Z223.1) is available from:
American National Standard Institute Inc. 11 West 42nd Street New York, NY 10036
These unit heaters are CSA International design-certied. These unit heaters are certied for installation to combus-
tible material as listed in Table 1 and on unit rating plate. Accessibility and service clearances must be observed in
addition to re protection clearances.
All electrical wiring and grounding for unit must be in ac­cordance with the regulations of the current edition of ANSI/NFPA No. 70, National Electric Code.
The National Electric Code is available from: National Fire Protection Association
1 Batterymarch Park PO Box 9101 Quincy, MA 02269-9101
Page 7
Requirements in Canada
These instructions are intended only as a general guide and do not supersede local codes in any way. Authorities having jurisdiction should be consulted before installation. The installation must conform with local building codes or, in the absence of local codes, with the current edition of CSA-B149 installation compliance codes. All electrical wir­ing and grounding for the unit must also comply with the current edition of CSA C22.1, Canadian Electrical Code.
These unit heaters are CSA-certied for the installation
clearances listed on the rating plate and in table 1. Adequate clearance must be provided around the appli-
ance and around air openings into the combustion cham­ber. Provision shall be made for service accessibility.
NOTE - Fire protection clearances may be exceeded to provide additional space for service and accessibility.
GARAGE / WAREHOUSE INSTALLATIONS
1 - In a storage area, clearance from heaters to
combustible materials must be such that the combustible material must not attain a temperature above 160°F (71°C) by continuous operation of the unit.
WARNING
Combustible materials that are a󰀨ected by exposure to
temperatures LESS than 160°F (plastics, plastic wrap, styrofoam, cardboard, etc.) must be stored well away from this heater. Discharge air temperatures for these units can approach 200°F.
2 - Maintain an 8-foot (2m) minimum clearance from the
oor to the bottom of the heater. Refer to the current
edition of CSA-B149 for installation compliance codes.
AIRCRAFT HANGER
1 - In an area where aircraft are housed or serviced, a
10-foot (3m) minimum clearance from the highest surface of the aircraft to bottom of the heater must be maintained.
2 - In other areas, an 8-foot (2m) minimum clearance
from the oor to bottom of heater must be maintained.
3 - Heaters should be located so that they are protected
from damage from aircraft or other appliances needed for servicing of aircraft. Refer to requirements of the enforcing authorities.
RESIDENTIAL
These units are approved for residential garage or
non-conned living space applications. For installation in a residential garage or non-conned living space, unit
must be installed so that burners and ignition source are
located no less than 18” (457mm) above oor. Heater
must be located or protected to avoid physical damage by vehicles. Refer to the current edition of CSA-B149 for in­stallation compliance codes. In a conned area, the heat­er must be installed in accordance with the current edition of CSA-B149 installation compliance codes. Be sure to check with local codes and ordinances for additional re­quirements.
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