Lennox LF24-115, LF24-200, LF24-145, LF24-175, LF24-230 Installation Instructions Manual
...
506682−01
*P506682-01*
E 2011 Lennox Industries Inc.
Dallas, Texas, USA
Litho U.S.A.
INSTALLATION
INSTRUCTIONS
LF24
100,000 to 400,000 Btuh Series
UNIT HEATERS
506682−01
5/2011
Supersedes 503,523M
Table Of Contents
LF24 Unit Dimensions 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Shipping 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Optional Accessories 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CSA Requirements in USA 3. . . . . . . . . . . . . . . . . . . . . . . . .
CSA Requirements in Canada 3. . . . . . . . . . . . . . . . . . . . . .
Additional Requirements 3. . . . . . . . . . . . . . . . . . . . . . . . . . .
Unit Heater Installation 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Combustion and Ventilation Air 4. . . . . . . . . . . . . . . . . . . . .
Rotation of Combustion Air Inducer 5. . . . . . . . . . . . . . . . . .
Venting 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrical Connections 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Typical LF24 Wiring Diagram 10. . . . . . . . . . . . . . . . . . . . . . .
Gas Connection 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Leak Check 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
RETAIN THESE INSTRUCTIONS
FOR FUTURE REFERENCE
Unit Start−Up 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
To Turn Off Gas to Unit 13. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Heating Sequence of Operation 13. . . . . . . . . . . . . . . . . . . . .
Ignition Control LED 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
High Altitude Adjustment 13. . . . . . . . . . . . . . . . . . . . . . . . . . .
Gas Flow 15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Gas Pressure Adjustment 15. . . . . . . . . . . . . . . . . . . . . . . . . .
Limit Control Switch 15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Louver Vane Adjustments 15. . . . . . . . . . . . . . . . . . . . . . . . . .
Combustion Air Pressure Switch 15. . . . . . . . . . . . . . . . . . . . .
Service 15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Start−Up and Performance Checklist 16. . . . . . . . . . . . . . . . .
Template 17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
WHAT TO DO IF YOU SMELL GAS:
Do not store or use gasoline or other
flammable vapors and liquids in the vicinity of this or any other appliance.
Installation and service must be performed by a qualified installer, service
agency or the gas supplier.
S Do not try to light any appliance.
S Leave the building immediately.
S Do not touch any electrical switch; do not use
any phone in your building.
S Immediately call your gas supplier from a
neighbor’s phone. Follow the gas supplier’s instructions.
S If you cannot reach your gas supplier, call the
fire department.
FIRE OR EXPLOSION HAZARD.
Failure to follow safety warnings exactly could result in serious injury, death,
or property damage.
WARNING
Be sure to read and understand the
installation, operation and service instructions in this manual.
Improper installation, adjustment, alteration, service or maintenance can cause
serious injury, death or property damage.
Page 1
LF24 Unit Dimensions
1/2
(13)
TOP VIEW
SIDE VIEW
ADJUSTABLE
LOUVERS
GAS
VALVE
HEAT
EXCHANGER
DIRECT
DRIVE FAN
FLUE
OUTLET
ELECTRICAL INLETS
3/8" x 16 MOUNTING NUTS
FOR UNIT SUSPENSION
AIR
FLOW
COMBUSTION AIR
INDUCER
END VIEW
A
B
C
E
F
G
NOTE LF24 models 100, 115, 145, 175 and
200 have a single fan. LF24 models 230, 250, 300,
345 and 400 have two fans.
D
*7-5/8
(194)
1/2
(13)
Additional
mounting nuts
furnished on
LF−230,
LF24−250,
LF24−300,
LF24−345 and
LF24−400 models
only.
H
NOTE Two mounting nuts are furnished on
LF24 models 100, 115, 145, 175 and 200. Four
mounting nuts are furnished on LF24 models
230, 250, 300, 345 and 400 models.
Unit
A B C D E F G H
in. mm in. mm in. mm in. mm in. mm in. mm in. mm in. mm
LF24-100
LF24-115
LF24−145
31-5/16 795 32-3/16 817 20-3/16 512 11-1/2 292 19-1/16 484 11-3/4 298 3-1/4 83 7-7/8 200
LF24−175
LF24−200
31-5/16 795 32-3/16 817 23-1/8 588 11-1/2 292 22-1/16 560 8−1/2 216 3-1/4 83 8−11/16 220
LF24-230*
LF24−250*
LF24−300*
31-5/16 795 32-3/16 817 41-1/8 1045 3-11/16 97 40 1016 17-3/4 451 3-1/2 89 8-11/16 220
LF24-345*
LF24−400*
31-5/16 795 32-3/16 817 41-1/8 1045 3-11/16 97 40 1016 17-1/2 445 3-1/2 89 9-13/16 248
*Unit contains dual fans.
Shipping
The heater is completely assembled and is shipped with installation and operating instructions, warranty certificate and
flue transition. Check the unit for shipping damage. The receiving party should contact the last carrier immediately if any
shipping damage is found.
Page 2
Optional Accessories
TABLE 1
LF24−100 to LF24−230
Gas
Heating
Performance
Model No. − Stainless Steel LF24−100S LF24−115S LF24−145S LF24−175S LF24−200S
Model No. − Aluminized Steel LF24−100A LF24−115A LF24−145A LF24−175A LF24−200A
Optional Accessories − Must Be Ordered Extra
Discharge
Nozzle
30_ − 94K94 S S S
30_ − 94K95 S S
45_ − 95K98 S S S
45_ − 95K99 S S
60_ − 16L28 S S S
60_ − 16L29 S S
90_ − 15L96 S S S
90_ − 15L97 S S
Hanging Bracket
Kit
87277 S S S S S
High Altitude
Pressure Switch
Kit
10K73 S
1
S
1
S
1
S
2
− − −
LPG/Propane Kit
45L85 S
63J56 S S S
20L07 S
63J57
1
LF24−100 through −145 require replacement combustion air inducer pressure switch at altitudes over 5500 feet above sea level.
2
LF24−175 requires replacement combustion air inducer pressure switch at altitudes over 2500 feet above sea level.
TABLE 2
LF24−230 to LF24−400
Gas
Heating
Performance
Model No. − Stainless Steel LF24−230S LF24−250S LF24−300S LF24−345S LF24−400S
Model No. − Aluminized Steel LF24−230A LF24−250A LF24−300A LF24−345A LF24−400A
Optional Accessories − Must Be Ordered Extra
Discharge
Nozzle
30_ − 94K96 S S S S S
45_ − 95K00 S S S S S
60_ − 16L30 S S S S S
90_ − 15L98 S S S S S
Hanging Bracket
Kit
87277 S S S S S
LPG/Propane Kit
45L88 S S
63J57 S S
20L06 S
Page 3
CSA 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.
Authorities having jurisdiction should be consulted before
installation. Air for combustion and ventilation must
conform 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 units are CSA international design−certified. These
unit heaters are certified for clearances to combustible
material as listed in table 1 and on unit rating plate.
Accessibility and service clearances must be observed in
addition to fire 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
CSA 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−certified for clearances to
combustible material listed on the rating plate and table 3.
Adequate clearance must be provided around the
appliance and around air openings into the combustion
chamber. Provision must be made for service
accessibility.
NOTE: Fire protection clearances may be exceeded to
provide additional space for service and accessibility.
TABLE 3
UNIT CLEARANCES TO COMBUSTIBLE MATERIALS
Top
Sides Bottom Rear Flue
in mm in mm in mm in mm in mm
6 152 6 152 0 0 18 457 6 152
GARAGE / WAREHOUSE INSTALLATIONS
1 − In a storage area, clearance from the heater to
combustible materials must be such that the
combustible material must not attain a temperature
above 160°F (71°C) during continuous operation of
the unit.
WARNING
Combustible materials that are affected 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 (2.5 m) minimum clearance from
the floor to the bottom of the heater. Refer to the
current edition of CSA−B149 installation compliance
codes.
AIRCRAFT HANGER
1 − In an area where aircraft are housed or serviced, a
10−foot (3 m) minimum clearance from the highest
surface of the aircraft to bottom of the heater must
be maintained.
2 − In other areas, an 8−foot (2.5 m) minimum clearance
from the floor 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.
In a confined 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.
Page 4
Additional Requirements
The Commonwealth of Massachusetts stipulates the
following additional requirements:
1 − Gas furnaces shall be installed by a licensed
plumber or gas fitter only.
2 − The gas cock must be T handle" type.
Unit Heater Installation
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.
The appliance shall not be installed downstream from
evaporator coils or cooling units.
Install the unit in the desired location as governed by
clearances, vent connection, air direction, gas supply,
electrical supply and service accessibility.
On LF24 models 100, 115, 145, 175, and 200, mounting
nuts are furnished at the balance point (two positions
only). On LF24 models 230, 250, 300, 345 and 400,
mounting nuts are furnished at each corner of the unit.
Mounting nuts will accommodate 3/8" x 16 threaded rods.
1 − Cut threaded rods to desired length and slide a 3/8"
nut onto the rod.
2 − Slide a flat washer onto the threaded rod AFTER the
nut (7/16" inside diameter X 1" outside diameter X
1/16" thick washer).
3 − Screw the rods (two or four) into the mounting nuts
on the unit.
4 − Tighten nuts to secure unit to rods.
IMPORTANT
Do not use the gas manifold pipe to lift unit. Any excessive upward or downward force on the manifold
pipe and bracket assembly can cause the ignition
burner and igniter to become misaligned.
TABLE 4
MAXIMUM MOUNTING HEIGHTS
Model Number Feet (Meters)
LF24−100 and LF24−115 16 (4.9)
LF24−145, LF24−175, and
LF24−200
20 (6.1)
LF24−230, LF24−250,
LF24−300, LF24−345 and
LF24−400
30 (9.1)
Combustion and Ventilation Air
Adequate facilities for supplying air for combustion and
ventilation must be provided in accordance with the
current edition of ANSI Z223.1, section 5.3, and
CSA−B149 installation compliance codes, or applicable
provisions of local building codes.
All gas−fired appliances require air to be used for the
combustion process. In many buildings today, there is a
negative indoor air pressure caused by exhaust fans, etc.
If sufficient quantities of combustion air are not available,
the heater or another appliance will operate in an
inefficient manner, resulting in incomplete combustion
which can result in the production of excessive carbon
monoxide.
CAUTION
Insufficient combustion air can cause headaches,
nausea, dizziness, asphyxiation or death.
If indoor air is to be used for combustion, it must be free of
the following substances or the life of the heat exchanger
will be adversely affected: chlorine, carbon tetrachloride,
cleaning solvent, halogen refrigerants, acids, cements
and glues, printing inks, fluorides, paint removers,
varnishes, or any other corrosives.
Rotation of Combustion Air Inducer
(LF24−100, −115 and −145 Only)
The combustion air inducer on LF24 models −100, −115
and −145 may be rotated 90° either to the left or right of the
original vertical position in order to better suit the
application.
NOTE − It is not permissible to rotate the combustion air
inducer on LF24 models −175, −200, −230, −250, −300,
−345 and −400.
Rotate the combustion air inducer assembly as follows:
1 − Remove the heater from the carton. Decide the best
unit heater orientation. The vent can be installed in
one of three discharge positions: up, left, or right.
Page 5
2 − If the inducer is to be rotated, follow the instructions
in this section; otherwise, refer to instructions under
Venting" section.
3 − Before making an electrical or gas connections,
remove the securing screws on the flue
box/combustion air inducer. See figure 1.
FIGURE 1
FLUE BOX AND
COMBUSTION AIR INDUCER ASSEMBLY
VEST PANEL
FLUE BOX GASKET
FLUE BOX
COMBUSTION AIR INDUCER GASKET
COMBUSTION AIR INDUCER
4 − Remove the flue box/combustion air inducer
assembly, ensuring that the gasket is not damaged.
If the gasket is damaged, replace it.
5 − Use a 1/4" socket to remove the three screws which
secure the combustion air inducer to the flue box.
Remove the inducer and gasket from the flue box
ensuring that the gasket is not damaged. If the
gasket is damaged, replace it.
6 − Use the template provided in the back of this manual
to mark new hole locations. Use a 7/32" drill bit to
drill holes in flue box.
7 − Place the gasket between the combustion air
inducer and the flue box. Rotate both the inducer
and the gasket 90° to the desired position. Reinsert
and tighten the three inducer securing screws
(#8−16 X 1/2" HWHSMS).
8 − Place the gasket between the flue box and the vest
panel. Position the flue box/combustion air inducer
assembly on the vest panel. Fasten the flue box to
the vest panel using the flue box securing screws
(#10−16 X 5/8" HWHSMS) and a 5/16" driver.
9 − The unit heater is now ready for installation as
described in the Venting section.
Venting
NOTE − The vent is a passageway, vertical or nearly so,
used to convey flue gases from an appliance, or its vent
connector, to the outside atmosphere. The vent
connector is the pipe or duct that connects a fuel−gas
burning appliance to a vent or chimney.
NOTE − Local codes may supersede any of these
provisions.
GENERAL RECOMMENDATION AND REQUIREMENTS
LF24 unit heaters must be vented in compliance with the
latest edition of the National Fuel Gas Code (NFPA 54 /
ANSI Z223.1) in the USA and with CSA−B149.1 codes in
Canada, as well as applicable provisions of local building
codes, and the following instructions.
A sheet metal flue transition is supplied with this
certified unit. It must not be modified or altered and
must be installed on the outlet of the combustion air
inducer assembly prior to the installation of the vent
connector. Failure to comply with this requirement
will void the certification of the unit by the approval
agencies.
A single−wall vent connector may be used in all
applications between the furnace and the vertical vent
pipe.
A single−wall vent pipe used as a vent connector or as a
vertical vent, must have all seams and joints sealed with
pressure−sensitive aluminum tape or silicone rubber
sealant. Aluminum tape must meet the provisions of
SMACNA AFTS−100−73 Standards. The aluminum tape
must have a temperature rating of 400°F (204°C).
Silicone rubber sealant must have a temperature rating of
482°F (250°C), i.e., Dow Corning RTV−736 or equivalent.
All joints must be secured with at least two corrosion
resistant screws. All joints must be checked for gas
tightness after installation. Single−wall vent pipe used as
vertical vent must not pass through any attic, interior wall,
concealed space, or floor.
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