Lennox International Inc. G24-200 - Manual (Page 7)

Page 7
For installation in a residential garage, the furnace must be
installed so that the burner(s) and the ignition source are lo-
cated no less than 18 inches (457 mm) above the floor. The
furnace must be located or protected to avoid physical dam-
age by vehicles. When a furnace is installed in a public garage,
hangar, or other building that has a hazardous atmosphere,
the furnace must be installed according to recommended
good practice requirements and current National Fuel Gas
Code or CSA B149.1 standard.
The furnace must be adjusted to obtain a temperature rise
range and within the allowable external static pressure on
furnaces with a duct system as listed on unit nameplate.
Installation in parking structures must be in accordance
with the Standard for Parking Structures (ANSI/NFPA No.
88A−1991). Installation in repair garages must be in accor-
dance with the Standard for Repair Garages (ANSI/NFPA
No. 88B−1991).
The G24−200 furnace must be installed so that electrical
components are protected from water.
When the furnace is used with cooling units, it shall be
installed in parallel with, or on the upstream side of, cooling
units to avoid condensation in the heating compartment.
With a parallel flow arrangement, a damper (or other means
to control the flow of air) must adequately prevent chilled air
from entering the furnace. If the damper is manually oper-
ated, it must be equipped to prevent operation of either the
heating or the cooling unit, unless it is in the full HEAT" or
COOL" setting.
When installed, the furnace must be electrically
grounded according to local codes. In addition, in the
United States, installation must conform with the current
National Electric Code, ANSI/NFPA No. 70. The National
Electric Code (ANSI/NFPA No. 70) is available from the
following address:
National Fire Protection Association
1 Battery March Park
Quincy, MA 02269
In Canada, all electrical wiring and grounding for the unit
must be installed according to the current regulations of the
Canadian Electrical Code Part I (CSA Standard C22.1)
and/or local codes.
Never test for gas leaks with an open flame. Check all con-
nections with a commercially available soap solution made
specifically for leak detection.
NOTE − Furnace must be adjusted to obtain a tempera-
ture rise (high and low fire) within the range(s) specified
on the unit nameplate. Failure to do so may cause erratic
limit operation.
Field wiring connection must meet or exceed specifications
of type T wire and withstand a maximum temperature rise
of 180
°F (82°C).
When the furnace is installed so that supply ducts carry air
circulated by the furnace to areas outside of the space con-
taining the furnace, return air shall be handled by a duct(s)
sealed to the furnace casing and terminating outside space
containing furnace.
NOTE − This furnace is designed for a minimum continu-
ous return air temperature of 60°F (16°C) or an intermit-
tent operation down to 55°F (13°C) dry bulb for cases
where a night setback thermostat is used. Return air
temperature must not exceed 85°F (29°C) dry bulb.
Use of this unit as a construction heater or air conditioner
is not recommended during any phase of construction.
Very low return air temperatures, harmful vapors and op-
eration of the unit with clogged or misplaced filters will
damage the unit.
If this unit has been used for heating or cooling of buildings
or structures under construction, the following conditions
must be met or the warranty will be void:
S The vent hood must be installed per these installation
instructions.
S A room thermostat must control the unit. The use of
fixed jumpers that will provide continuous heating or
cooling is not allowed.
S A pre−filter must be installed at the entry to the return air
duct.
S The return air duct must be provided and sealed to the
unit.
S Return air temperature range between 55°F (13°C)
and 80°F (27°C) must be maintained.
S Air filters must be replaced and pre−filters must be re-
moved upon construction completion.
S The input rate and temperature rise must be set per the
unit rating plate.
S The heat exchanger, components, duct system, air fil-
ters and evaporator coil must be thoroughly cleaned
following final construction clean−up.
S The unit operating conditions (including airflow, cool-
ing operation, ignition, input rate, temperature rise and
venting) must be verified according to these installa-
tion instructions.
NOTE − The Commonwealth of Massachusetts stipu-
lates these additional requirements:
S Gas units shall be installed by a licensed plumber
or gas fitter only.
S The gas cock must be T handle" type.
The Lennox G24−200 furnace may be installed in alcoves,
closets, basements, garages and utility rooms.