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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, ser-
vice or maintenance can cause property damage,
personal injury or loss of life. Installation and ser-
vice 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 ex-
cessive upward or downward force on the manifold
pipe and bracket assembly can cause the ignition
burner and igniter to become misaligned.
MAXIMUM MOUNTING HEIGHTS
Model Number
LF24−100 and LF24−115
LF24−145, LF24−175, and
LF24−200
LF24−230, LF24−250,
LF24−300, LF24−345 and
LF24−400
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.
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 4
TABLE 4
Feet (Meters)
16 (4.9)
20 (6.1)
30 (9.1)
CAUTION
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