Lennox G50DF(X)?24A?045, G50DF(X)?48C?090, G50DF?60C?110, G50DF?60D?135, G50DF(X)?36A?070 Installation Instructions Manual
...
INSTALLATION
E 2006 Lennox Industries Inc.
Dallas, Texas, USA
THIS MANUAL MUST BE LEFT WITH THE
HOMEOWNER FOR FUTURE REFERENCE
INSTRUCTIONS
G50DF(X) Series
GAS FURNACE
505,255M
10/2009
Supersedes 05/2009
Table of Contents
G50DF(X) Unit Dimensions 2. . . . . . . . . . . . . . . . . . . . . . .
G50DF(X) Parts Arrangement 3. . . . . . . . . . . . . . . . . . . . .
G50DF(X) Gas Furnace 4. . . . . . . . . . . . . . . . . . . . . . . . . .
Shipping and Packing List 4. . . . . . . . . . . . . . . . . . . . . . . .
Safety Information 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
General 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Use of Furnace as a Construction Heater 5. . . . . . . . . . .
Combustion, Dilution, & Ventilation Air 6. . . . . . . . . . . . .
Downflow Installation 9. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Setting Equipment 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Filters 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Duct System 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Venting 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Gas Piping 19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrical 20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Unit Start−Up 24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Gas Pressure Adjustment 25. . . . . . . . . . . . . . . . . . . . . . .
High Altitude Information 26. . . . . . . . . . . . . . . . . . . . . . . .
Other Unit Adjustments 26. . . . . . . . . . . . . . . . . . . . . . . . . .
Blower Performance 27. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Service 28. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Repair Parts List 30. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Planned Service 30. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SureLight
SureLight
G50DF(X) Start−Up & Performance Check List 35. . . . . .
®
Integrated Control Diagnostic Codes 31. . . .
®
Control Troubleshooting 32. . . . . . . . . . . . . . .
Litho U.S.A.
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.
10/09
*2P1009*
WARNING
FIRE OR EXPLOSION HAZARD.
Failure to follow safety warnings exactly could result in serious injury, death,
or property damage.
WHAT TO DO IF YOU SMELL GAS:
D Do not try to light any appliance.
D Do not touch any electrical switch; do not
use any phone in your building.
D Leave the building immediately.
D Immediately call your gas supplier from a
neighbor’s phone. Follow the gas supplier’s
instructions.
D If you cannot reach your gas supplier, call
the fire department.
Page 1
505,255M
*P505255M*
G50DF(X) Unit Dimensions − inches (mm)
A
B
AIR FLOW
FLUE OUTLET
5/8
(16)
(Top)
3−3/4 (95)
D
5/8 (16)
RETURN AIR
OPENING
B
19−1/2
(495)
5/8 (16)
TOP VIEW
28−1/2
(724)
19−1/2
(495)
5/8
(16)
5/8
(16)
40
(1016)
ELECTRICAL INLET
(Either Side)
4−7/8 (124) Right
2−1/4 (57) Left
GAS PIPING INLET
(Either Side)
9−1/4
(235)
3/4
(19)
C
Supply
Air
3/4
(19)
19−1/4
(489)
Supply
Air
3/4
(19)
FRONT VIEW SIDE VIEW
Model No.
G50DF(X)−24A−045,
G50DF(X)−36A−070
G50DF−36B−090 17−1/2 446 16−1/4 413 16 406 6 152
G50DF(X)−48C−090,
G50DF−48C−110,
G50DF−60C−110
G50DF−60D−135 24−1/2 622 23−1/4 591 23 584 9−1/2 241
14−1/2 368 13−1/4 337 13 330 4−1/2 114
A B C D
in. mm in. mm in. mm in. mm
21 533 19−1/4 502 19−1/2 495 7−3/4 197
Page 2
G50DF(X) Parts Arrangement
Internal Flue
Pipe
Assembly
Blower Motor
Gasket
Blower Assembly
Flue
Chase
Gasket
Transformer
Integrated Ignition
Control Board
Flue Box Gasket
Flue Collector Box
Gasket
Capacitor
Interlock Switch
Gas Valve
Combustion
Air Orifice
Door
Flame
Sensor
Primary
Limit
Burner
Flame Rollout
Switches
Bracket
Heat Exchanger
Ignitor
Combustion Air
Pressure Switch
Combustion Air Inducer
Gas
Orifices
FIGURE 1
Page 3
Ignitor
Manifold
G50DF(X) Gas Furnace
The G50DF(X) gas furnace is shipped ready for installation in the downflow position fueled by natural gas. A
conversion kit (ordered separately) is required for use in
propane/LP gas applications.
Shipping and Packing List
Package 1 of 1 contains
1 − Assembled G50DF(X) unit
1 − Bag assembly containing the following:
3 − Wire nuts
1 − Snap bushing
1 − Snap plug
1 − Wire tie
1 − Vent warning label
1 − Owner’s manual and warranty card
The following items may be ordered separately:
1 − Thermostat
1 − Propane/LP changeover kit
DANGER
Danger of explosion.
There are circumstances in which odorant used with
LP/propane gas can lose its scent. In case of a leak,
LP/propane gas will settle close to the floor and may
be difficult to smell. An LP/propane leak detector
should be installed in all LP applications.
Check equipment for shipping damage. If you find any
damage, immediately contact the last carrier.
Safety Information
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.
G50DF(X) units are CSA International certified to ANSI
Z21.47 and CSA 2.3 standard.
In the USA, installation of gas furnaces must conform with
local building codes. In the absence of local codes, units
must be installed according to the current National Fuel
Gas Code (ANSI-Z223.1/NFPA 54). The National Fuel Gas
Code is available from the following address:
American National Standards Institute, Inc.
11 West 42nd Street
New York, NY 10036
In Canada, installation must conform with current National
Standard of Canada CSA B149 Natural Gas and Propane
Installation Codes, local plumbing or waste water codes
and other applicable local codes.
Adequate clearance must be made around the air openings into the vestibule area. In order to ensure proper unit
operation, combustion and ventilation air supply must be
provided according to the current National Fuel Gas Code
or CSA-B149 standards.
Vent installations must be consistent with the venting
tables (in this instruction) and applicable provisions of local
building codes.
This furnace is CSA International certified for installation
clearances to combustible material as listed on the unit
nameplate and in the table in figure 9. Accessibility and service clearances must take precedence over fire protection
clearances.
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 18 inches (457 mm) 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 hazardous atmosphere, the furnace must be installed according to recommended good practice requirements and current National Fuel Gas Code or CSA B149 standards.
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 G50DF(X) furnace must be installed so that its electrical 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 operated, 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.
Page 4
When installed, this 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.
NOTE − This furnace is designed for a minimum continuous return air temperature of 60°F (16°C) or intermittent
operation down to 55°F (13°C) dry bulb in cases where a
night setback thermostat is used. Return air temperature
must not exceed 85°F (29°C) dry bulb.
The G50DF(X) furnace may be installed in alcoves, closets, attics, basements, garages, and utility rooms in the
downflow position.
This furnace design has not been CSA International certified for installation in mobile homes, recreational vehicles,
or outdoors.
Use of Furnace as Construction Heater
Lennox does not recommend the use of G50DF(X) units as
a construction heater during any phase of construction.
Very low return air temperatures, harmful vapors and operation of the unit with clogged or misplaced filters will damage the unit.
G50DF(X) units may be used for heating of buildings or
structures under construction, if the following conditions
are met:
D The vent system must be permanently installed per
these installation instructions.
D A room thermostat must control the furnace. The use of
fixed jumpers that will provide continuous heating is not
allowed.
D The return air duct must be provided and sealed to the
furnace.
D Return air temperature range between 60°F (16°C) and
80°F (27°C) must be maintained.
D Air filters must be installed in the system and must be
maintained during construction.
D Air filters must be replaced upon construction comple-
tion.
D The input rate and temperature rise must be set per the
furnace rating plate.
D One hundred percent (100%) outdoor air must be pro-
vided for combustion air requirements during construction. 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.
D The furnace heat exchanger, components, duct system,
air filters and evaporator coils must be thoroughly
cleaned following final construction clean−up.
D All furnace operating conditions (including ignition, in-
put rate, temperature rise and venting) must be verified
according to these installation instructions.
NOTE − The Commonwealth of Massachusetts stipulates these additional requirements:
D Gas furnaces shall be installed by a licensed plumb-
er or gas fitter only.
D The gas cock must be T handle" type.
D When a furnace is installed in an attic, the passage-
way to and service area surrounding the equipment
shall be floored.
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 following general recommendations must be considered
when installing a G50DF(X) furnace:
D 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.
D Do not install the furnace where drafts might blow direct-
ly into it. This could cause improper combustion and unsafe operation.
D Do not block the furnace combustion air openings with
clothing, boxes, doors, etc. Air is needed for proper
combustion and safe unit operation.
D When the furnace is installed in an attic or other insu-
lated space, keep insulation away from the furnace.
Page 5
WARNING
Product contains fiberglass wool.
Disturbing the insulation in this product during
installation, maintenance, or repair will expose you
to fiberglass wool. Breathing this may cause lung
cancer. (Fiberglass wool is known to the State of California to cause cancer.)
Fiberglass wool may also cause respiratory, skin,
and eye irritation.
To reduce exposure to this substance or for further
information, consult material safety data sheets
available from address shown below, or contact your
supervisor.
Lennox Industries Inc.
P.O. Box 799900
Dallas, TX 75379−9900
Combustion, Dilution, & Ventilation Air
In the past, there was no problem in bringing in sufficient outdoor air for combustion. Infiltration provided all the air that
was needed. In today’s homes, tight construction practices
make it necessary to bring in air from outside for combustion. Take into account that exhaust fans, appliance
vents, chimneys, and fireplaces force additional air that
could be used for combustion out of the house. Unless outside air is brought into the house for combustion, negative
pressure (outside pressure is greater than inside pressure)
will build to the point that a downdraft can occur in the furnace vent pipe or chimney. As a result, combustion gases
enter the living space creating a potentially dangerous situation.
In the absence of local codes concerning air for combustion and ventilation, use the guidelines and procedures in
this section to install G50DF(X) furnaces to ensure efficient
and safe operation. You must consider combustion air
needs and requirements for exhaust vents and gas piping.
A portion of this information has been reprinted with permission from the National Fuel Gas Code
(ANSI-Z223.1/NFPA 54). This reprinted material is not the
complete and official position of the ANSI on the referenced
subject, which is represented only by the standard in its entirety.
In Canada, refer to the CSA B149 installation codes.
CAUTION
Do not install the furnace in a corrosive or contaminated atmosphere. Meet all combustion and ventilation air requirements, as well as all local codes.
CAUTION
Insufficient combustion air can cause headaches,
nausea, dizziness or asphyxiation. It will also cause
excess water in the heat exchanger resulting in rusting and premature heat exchanger failure. Excessive
exposure to contaminated combustion air will result
in safety and performance related problems. Avoid
exposure to the following substances in the combustion air supply:
Permanent wave solutions
Chlorinated waxes and cleaners
Chlorine base swimming pool chemicals
Water softening chemicals
De-icing salts or chemicals
Carbon tetrachloride
Halogen type refrigerants
Cleaning solvents (such as perchloroethylene)
Printing inks, paint removers, varnishes, etc.
Hydrochloric acid
Cements and glues
Antistatic fabric softeners for clothes dryers
Masonry acid washing materials
All gas-fired appliances require air for the combustion process. If sufficient combustion air is not available, the furnace or other appliances will operate inefficiently and unsafely. Enough air must be provided to meet the needs of all
fuel-burning appliances and appliances such as exhaust
fans which force air out of the house. When fireplaces, exhaust fans, or clothes dryers are used at the same time as
the furnace, much more air is necessary to ensure proper
combustion and to prevent a downdraft. Insufficient air
causes incomplete combustion which can result in carbon
monoxide.
In addition to providing combustion air, fresh outdoor air
dilutes contaminants in the indoor air. These contaminants may include bleaches, adhesives, detergents, solvents and other contaminants which can corrode furnace
components.
The requirements for providing air for combustion and ventilation depend largely on whether the furnace is installed in
an unconfined or a confined space.
Unconfined Space
An unconfined space is an area such as a basement or
large equipment room with a volume greater than 50 cubic
feet (1.42 m3) per 1,000 Btu (.29 kW) per hour of the combined input rating of all appliances installed in that space.
This space also includes adjacent rooms which are not
separated by a door. Though an area may appear to be unconfined, it might be necessary to bring in outdoor air for
combustion if the structure does not provide enough air by
Page 6
infiltration. If the furnace is located in a building of tight
construction with weather stripping and caulking around
the windows and doors, follow the procedures in the air
from outside section.
Confined Space
A confined space is an area with a volume less than 50 cubic feet (1.42 m3) per 1,000 Btu (.29 kW) per hour of the
combined input rating of all appliances installed in that
space. This definition includes furnace closets or small
equipment rooms.
When the furnace is installed so that supply ducts carry air
circulated by the furnace to areas outside the space containing the furnace, the return air must be handled by ducts
which are sealed to the furnace casing and which terminate
outside the space containing the furnace. This is especially
important when the furnace is mounted on a platform in a
confined space such as a closet or small equipment room.
Even a small leak around the base of the unit at the platform
or at the return air duct connection can cause a potentially
dangerous negative pressure condition. Air for combustion
and ventilation can be brought into the confined space either
from inside the building or from outside.
EQUIPMENT IN CONFINED
CHIMNEY
OR GAS
VENT
FURNACE
NOTE−Each opening shall have a free area of at least one square
inch (645 mm2) per 1,000 Btu (.29 kW) per hour of the total input rating of all equipment in the enclosure, but not less than 100 square
inches (64516 mm2).
SPACE ALL AIR FROM INSIDE
WATER
HEATER
OPENINGS
(To Adjacent
Room)
FIGURE 2
Air from Inside
If the confined space that houses the furnace adjoins a
space categorized as unconfined, air can be brought in by
providing two permanent openings between the two
spaces. Each opening must have a minimum free area of 1
square inch (645 mm2) per 1,000 Btu (.29 kW) per hour of
total input rating of all gas−fired equipment in the confined
space. Each opening must be at least 100 square inches
(64,516 mm2). One opening shall be within 12 inches (305
mm) of the top of the enclosure and one opening within 12
inches (305 mm) of the bottom. See figure 2.
Air from Outside
If air from outside is brought in for combustion and ventilation, the confined space must have two permanent openings. One opening shall be within 12 inches (305 mm) of the
top of the enclosure and one opening within 12 inches (305
mm) of the bottom. These openings must communicate directly or by ducts with the outdoors or spaces (crawl or attic) that freely communicate with the outdoors or indirectly
through vertical ducts. Each opening shall have a minimum
free area of 1 square inch (645 mm2) per 4,000 Btu (1.17
kW) per hour of total input rating of all equipment in the enclosure. See figures 3 and 4. When communicating with
the outdoors through horizontal ducts, each opening shall
have a minimum free area of 1 square inch (645 mm2) per
2,000 Btu (.56 kW) per total input rating of all equipment in
the enclosure. See figure 5.
When ducts are used, they shall be of the same cross−sectional area as the free area of the openings to which they
connect. The minimum dimension of rectangular air ducts
shall be no less than 3 inches (75 mm). In calculating free
area, the blocking effect of louvers, grilles, or screens must
be considered. If the design and free area of protective covering is not known for calculating the size opening required,
it may be assumed that wood louvers will have 20 to 25 percent free area and metal louvers and grilles will have 60 to
75 percent free area. Louvers and grilles must be fixed in the
open position or interlocked with the equipment so that they
are opened automatically during equipment operation.
Page 7
CHIMNEY OR
GAS VENT
FURNACE
(Inlet Air from Crawlspace and Outlet Air to Ventilated Attic)
VENTILATION LOUVERS
(Each end of attic)
EQUIPMENT IN CONFINED SPACE
ALL AIR FROM OUTSIDE
OUTLET
AIR
WATER
HEATER
CHIMNEY
OR GAS
VENT
FURNACE
VENTILATION
LOUVERS
(For unheated crawl space)
INLET
AIR
NOTE−The inlet and outlet air openings shall each have a free area of at least one square inch (645
mm2) per 4,000 Btu (1.17 kW) per hour of the total input rating of all equipment in the enclosure.
FIGURE 3
EQUIPMENT IN CONFINED SPACE
ALL AIR FROM OUTSIDE
(All Air Through Ventilated Attic)
VENTILATION LOUVERS
(Each end of attic)
OUTLET
AIR
above bottom)
INLET AIR
(Ends 12 in.
FURNACE
CHIMNEY
OR GAS
VENT
CONFINED SPACE
WATER
HEATER
OUTLET AIR
EQUIPMENT IN
ALL AIR FROM
OUTSIDE
NOTE−The inlet and outlet air openings shall each have a
free area of at least one square inch (645 mm2) per 4,000
Btu (1.17 kW) per hour of the total input rating of all equipment in the enclosure.
FIGURE 4
WATER
HEATER
INLET AIR
NOTE − Each air duct opening shall have a free area of at least
one square inch (645 mm2) per 2,000 Btu (.59 kW) per hour of
the total input rating of all equipment in the enclosure. If the
equipment room is located against an outside wall and the air
openings communicate directly with the outdoors, each opening shall have a free area of at least one square inch (645 mm2)
per 4,000 Btu (1.17 kW) per hour of the total input rating of all
other equipment in the enclosure.
FIGURE 5
Page 8
Downflow Installation
Downflow unit installs in three ways: on non−combustible
flooring, on combustible flooring using an additive base, or
on a reverse−flow cooling cabinet. Do not drag the unit
across the floor.
Installation on Non−Combustible Flooring
1 − Cut floor opening keeping in mind clearances listed on
unit rating plate. Also keep in mind gas supply connections, electrical supply, flue and air intake connections
and sufficient installation and servicing clearances.
See table 1 for correct floor opening size.
2 − Flange warm air plenum and lower the plenum into the
opening.
3 − Set the unit over the plenum and seal the plenum to
the unit.
3 − Ensure that the seal is adequate.
TABLE 1
NON−COMBUSTIBLE FLOOR OPENING SIZE
Model No.
A Cabinet (14.5") 19 − 3/4 502 13 − 1/4 337
B Cabinet (17.5") 19 − 3/4 502 16 − 1/4 413
Front to Rear Side to Side
in. mm in. mm
TABLE 2
ADDITIVE BASE FLOOR OPENING SIZE
Model No.
A Cabinet (14.5")
B Cabinet (17.5")
C Cabinet (21")
D Cabinet (24.5")
NOTE − Floor opening dimensions listed are 1/4 inch (6 mm) larger than
unit opening. See figure 1.
Front to Rear Side to Side
in. mm in. mm
22 559 15 − 3/4 400
22 559 18 − 3/4 476
22 559 22 − 3/4 578
22 559 25 − 3/4 654
2 − After opening is cut, set additive base into opening.
3 − Check fiberglass strips on additive base to make sure
they are properly glued and positioned.
4 − Lower supply air plenum into additive base until ple-
num flanges seal against fiberglass strips.
NOTE − Be careful not to damage fiberglass strips.
Check for a tight seal.
5 − Set the furnace over the plenum.
6 − Ensure that the seal between the furnace and plenum
is adequate.
C Cabinet (21") 19 − 3/4 502 19 − 3/4 502
D Cabinet (24.5") 19 − 3/4 502 23 − 1/4 591
NOTE − Floor opening dimensions listed are 1/4 inch (6 mm) larger than
the unit opening. See figure 1.
Installation on Combustible Flooring
1 − When unit is installed on a combustible floor, an addi-
tive base must be installed between the furnace and
the floor. The base must be ordered separately for the
following cabinet sizes:
D A cabinet 14.5" − # 11M59
D B cabinet 17.5" − # 11M60
D C cabinet −21" # 11M61
D D cabinet 24.5" − # 11M62
See table 2 for opening size to cut in floor.
CAUTION
The furnace and additive base shall not be installed
directly on carpeting, tile, or other combustible material other than wood flooring.
The furnace and additive base shall not be installed
directly on carpeting, tile, or other combustible material other than wood flooring.
G50DF(X)UNIT
SUPPLY AIR PLENUM
PROPERLY
SIZED FLOOR
OPENING
ADDITIVE BASE
FIGURE 6
Installation on Cooling Cabinet
1 − Refer to reverse−flow coil installation instructions for
correctly sized opening in floor and installation of cabinet.
2 − When cooling cabinet is in place, set and secure the
furnace according to the instructions that are provided
with the cooling coil. Secure the furnace to the cabinet.
3 − Seal the cabinet and check for air leaks.
Page 9
Return Air Opening −− Downflow Units
The following steps should be taken when installing plenum:
1 − Bottom edge of plenum should be flanged with a
hemmed edge (See figure 7).
PLENUM
SECURE FROM
OUTSIDE CABINET
Side View
HEMMED EDGE
NOTE − 1/3 hp blower motors are equipped with four flexible mounting legs, and 1/2 hp blower motors are equipped
with three flexible legs and one rigid leg. The rigid leg is
equipped with a shipping bolt and a flat white plastic washer (rather than the rubber mounting grommet used with a
flexible mounting leg). The bolt and washer must be re-
moved before the furnace is placed into operation. After the bolt and washer have been removed, the rigid leg
will not touch the blower housing.
FIBERGLASS SEALING
STRIP
(Field Provided)
CABINET SIDE PANEL
FIGURE 7
2 − Fiberglass sealing strips should be used.
3 − In all cases, plenum should be secured to top flanges
of furnace with sheet metal screws.
4 − In closet installations, it may be impossible to install
sheet metal screws from the outside. In this case,
make plenum with a removable front and install
screws from the inside (See figure 8).
5 − Make certain that an adequate seal is made.
SECURE FROM
INSIDE CABINET
FIBERGLASS
SEALING STRIP
(Field Provided)
CABINET SIDE
PLENUM
Side View
HEMMED EDGE
PANEL
FIGURE 8
Setting Equipment
WARNING
Do not install the furnace on its front or its back. Do
not connect the return air ducts to the back of the furnace. Doing so will adversely affect the operation of
the safety control devices, which could result in personal injury or death.
Install the G50DF(X) gas furnace as shipped. Do not
install the furnace horizontally.
Select a location that allows for the required clearances
that are listed on the unit nameplate. Also consider gas
supply connections, electrical supply, vent connection,
and installation and service clearances [24 inches (610
mm) at unit front]. The unit must be level.
NOTE − G50DF−36C−110 units include a bracket which stabilizes the blower motor during shipping. The bracket is secured to the blower housing by two screws. This bracket
must be removed prior to placing the unit into operation. See figure 1.
Downflow Application
Allow for clearances to combustible materials as indicated on the unit nameplate. Minimum clearances for
closet or alcove installations are shown in figure 9.
Downflow Application Installation Clearances
Top
Left Side
Bottom
Type of Vent
Connector
Top 1 in. (25 mm) 1 in. (25 mm)
*Front 3 in. (76 mm) 3 in. (76 mm)
Back 0 0
Sides 0† 0
Vent 6 in. (152 mm) 1 in. (25 mm)
Floor NC†† NC††
*Front clearance in alcove installation must be 24 in. (610 mm).
Maintain a minimum of 24 in. (610 mm) for front service access.
†Left side requires 3 in. if a single wall vent is used on 14 −1/2 in. cabinets, or 2 in. if a single wall vent is used on 17 − 1/2 in. cabinets.
††The furnace may be installed on a combustible wood floor if an
optional additive base is installed between the furnace and the
combustible floor.
Type C Type B1
Right Side
FIGURE 9
Page 10
WARNING
Improper installation of the furnace can result in personal injury or death. Combustion and flue products
must never be allowed to enter the return air system
or the living space. Use screws and joint tape to seal
the return air system to the furnace.
In platform installations with bottom return air, the
furnace should be sealed airtight to the return air plenum. A door must never be used as a portion of the
return air duct system. The base must provide a
stable support and an airtight seal to the furnace. Allow absolutely no sagging, cracks, gaps, etc.
The return and supply air duct systems must never
be connected to or from other heating devices such
as a fireplace or stove, etc. Fire, explosion, carbon
monoxide poisoning, personal injury and/or property damage could result.
WARNING
The blower access panel must be securely in place
when the blower and burners are operating. Gas
fumes, which could contain carbon monoxide, can
be drawn into living space resulting in personal injury or death.
Filters
This unit is not equipped with a filter or rack. A field−provided high−velocity filter is required for the unit to operate
properly. Table 3 lists the recommended minimum filter
sizes.
A filter must be in place any time the unit is operating.
TABLE 3
Furnace
Cabinet Size
14−1/2" 14 X 25 X 1 (1)
17−1/2" 16 X 25 X 1 (1)
21" 20 X 25 X 1 (1)
24−1/2" 24 X 25 X 1 (1)
Duct System
Use industry-approved standards to size and install the
supply and return air duct system. This will result in a quiet
and low-static system that has uniform air distribution.
Ensure that you have made a seal between the supply air
plenum and the furnace and between the furnace and the
return air plenum.
NOTE − Do not operate the furnace with an external static
pressure that exceeds 0.5 inches w.c. Higher external static pressures may cause erratic limit operation.
Return Air Filter Size (inches)
Return Air Plenum
NOTE − Return air must not be drawn from a room
where this furnace, or any other gas−fueled appliance (i.e., water heater), or carbon monoxide−
producing device (i.e., wood fireplace) is installed.
When return air is drawn from a room, a negative pressure is created in the room. If a gas appliance is operating
in a room with negative pressure, the flue products can
be pulled back down the vent pipe and into the room. This
reverse flow of the flue gas may result in incomplete combustion and the formation of carbon monoxide gas. This
toxic gas might then be distributed throughout the house
by the furnace duct system.
Venting
A 4−inch diameter flue transition is factory-installed on all
models. Modifying or removing the flue transition will
cause the unit to operate unsafely and will void the unit
certification. The vent connector does not require insula-
tion.
The G50DF(X) series units are classified as fan−assisted
Category I furnaces when vertically vented according to
the latest edition of National Fuel Gas Code (ANSI
Z223.1/NFPA 54) in the USA and the current standards of
CSA B149 Natural Gas and Propane Installation Codes in
Canada. A fan−assisted Category I furnace is an appliance
equipped with an integral mechanical means to either draw
or force combustion products through the combustion
chamber and/or heat exchanger.
NOTE − Use these instructions as a guide. They do not supersede local codes. This furnace must be vented according to all local codes, these installation instructions, and the
provided venting tables (5 through 10) in these instructions.
The venting tables in this manual were extracted from the
National Fuel Gas Code (ANSI Z223.1/NFPA 54) and are
provided as a guide for proper vent installation. Proper application, termination, construction and location of vents
must conform to local codes having jurisdiction. In the absence of local codes, the NFGC serves as the defining document.
Refer to the tables and the venting information contained in
these instructions to properly size and install the venting
system.
IMPORTANT
Once the venting system is installed, attach the Disconnected Vent" warning sticker to a visible area of
the plenum near the vent pipe. The warning sticker
is provided in the bag assembly.
Page 11
Loading...