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Requirements
Use only the type of gas approved for use with this furnace.
Refer to unit nameplate.
G61MPVT units are certified for installation clearances to
combustible material as listed on the unit nameplate and in
the tables in figures 3, 9 and 6. Accessibility and service
clearances must take precedence over fire protection clear-
ances.
NOTE − For installation on combustible floors, the furnace
shall not be installed directly on carpeting, tile, or other
combustible material other than wood flooring.
For installation in a residential garage, the furnace must
be installed so that the burner(s) and the ignition source
are located no less than 457mm (18 inches) above the
floor. The furnace must be located or protected to avoid
physical damage by vehicles. When a furnace is installed
in a public garage, hangar, or other building that has a haz-
ardous atmosphere, the furnace must be installed accord-
ing to recommended good practice requirements and cur-
rent National Fuel Gas Code or AS 5601 standard.
NOTE − Furnace must be adjusted to obtain a temperature
rise within the range specified on the unit nameplate. Failure
to do so may cause erratic limit operation.
This G61MPVT furnace must be installed so that its electri-
cal components are protected from water.
When this 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, this furnace must be electrically grounded
according to local codes.
NOTE − This furnace is designed for a minimum continu-
ous return air temperature of 16°C (60°F) or an intermit-
tent operation down to 13°C (55°F) dry bulb for cases
where a night setback thermostat is used. Return air tem-
perature must not exceed 29°C (85°F) dry bulb.
The G61MPVT furnace may be installed in alcoves, clos-
ets, attics, basements, garages, and utility rooms. This fur-
nace design has not been certified for installation in mobile
homes, recreational vehicles, or outdoors.
Never use an open flame to test for gas leaks. Check all
connections using a commercially available soap solution
made specifically for leak detection.
Lennox does not recommend the use of G61MPVT units as
a construction heater during any phase of construction.
Very low return air temperatures, harmful vapors and op-
eration of the unit with clogged or misplaced filters will dam-
age the unit.
G61MPVT units may be used for heating of buildings or
structures under construction, if the following conditions
are met:
The vent system must be permanently installed per
D
these installation instructions.
A room thermostat must control the furnace. The use of
D
fixed jumpers that will provide continuous heating is not
allowed.
D
The return air duct must be provided and sealed to the
furnace.
Return air temperature range between 16°C (60°F) and
D
27°C (80°F) must be maintained.
Air filters must be installed in the system and must be
D
maintained during construction.
Air filters must be replaced upon construction comple-
D
tion.
D
The input rate and temperature rise must be set per the
furnace rating plate.
One hundred percent (100%) outdoor air must be pro-
D
vided for combustion air requirements during construc-
tion. Temporary ducting may supply outdoor air to the
furnace. Do not connect duct directly to the furnace.
Size the temporary duct following these instructions in
section for Combustion, Dilution and Ventilation Air in a
confined space with air from outside.
The furnace heat exchanger, components, duct system,
D
air filters and evaporator coils must be thoroughly
cleaned following final construction clean−up.
All furnace operating conditions (including ignition, in-
D
put rate, temperature rise and venting) must be verified
according to these installation instructions.
General
These instructions are intended as a general guide and do
not supersede local codes in any way. Consult authorities
having jurisdiction before installation.
In addition to the requirements outlined previously, the fol-
lowing general recommendations must be considered
when installing a G61MPVT furnace:
• Place the furnace as close to the center of the air dis-
tribution system as possible. The furnace should also be
located close to the chimney or vent termination point.
• When the furnace is installed in non−direct vent applica-
tions, do not install the furnace where drafts might blow
directly into it. This could cause improper combustion
and unsafe operation.
• When the furnace is installed in non−direct vent applica-
tions, do not block the furnace combustion air opening
with clothing, boxes, doors, etc. Air is needed for proper
combustion and safe unit operation.
Page 40
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