Lennox G51MP-24B-045, G51MP-36C-090, G51MP-36B-045, G51MP-36B-070, G51MP-48C-090 Installation Instructions Manual
...
INSTALLATION
E 2005 Lennox Industries Inc.
Dallas, Texas, USA
THIS MANUAL MUST BE LEFT WITH THE
HOMEOWNER FOR FUTURE REFERENCE
INSTRUCTIONS
G51MP SERIES UNITS
GAS UNITS
505,065M
05/2009
Supersedes 07/2007
Table of Contents
Unit Dimensions 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
G51MP Parts Identification 3. . . . . . . . . . . . . . . . . . . . . .
Shipping and Packing List 4. . . . . . . . . . . . . . . . . . . . . .
Safety Information 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Use of Furnace as a Construction Heater 5. . . . . . . . .
General 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Combustion, Dilution & Ventilation Air 6. . . . . . . . . . . .
Installation − Setting Equipment 9. . . . . . . . . . . . . . . . . .
Filters 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Duct System 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pipe & Fittings Specifications 16. . . . . . . . . . . . . . . . . . . .
Vent Piping Guidelines 18. . . . . . . . . . . . . . . . . . . . . . . . .
Joint Cementing Procedure 19. . . . . . . . . . . . . . . . . . . . .
Venting Practices 19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Gas Piping 31. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrical 34. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Unit Start−Up 38. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Gas Pressure Adjustment 39. . . . . . . . . . . . . . . . . . . . . .
High Altitude Information 41. . . . . . . . . . . . . . . . . . . . . . .
Other Unit Adjustments 43. . . . . . . . . . . . . . . . . . . . . . . . .
Service 46. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Planned Service 48. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Repair Parts List 48. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Troubleshooting 49. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Ignition Control Board Diagnostic Codes 52. . . . . . . . . .
Vent Pipe Sizing Worksheet 53. . . . . . . . . . . . . . . . . . . . .
Start−Up & Performance Check List 53. . . . . . . . . . . . . .
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.
05/09
*2P0509*
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
505,065M
*P505065M*
G51MP Unit Dimensions − inches (mm)
*NOTE − 60C and 60D size units installed in upflow applications that require air volumes over 1800 cfm (850 L/s) must
have one of the following:
1. Single side return air with transition, to accommodate
20 x 25 x 1 in. (508 x 635 x 25 mm) air filter.
Required to maintain proper air velocity.
2. Single side return air with optional RAB Return Air Base
3. Bottom return air.
4. Return air from both sides.
5. Bottom and
Refer to Engineering Handbook for additional information.
**Consider sizing requirements for optional IAQ equipment
before cutting side return opening.
1
Optional External Side Return Air Filter Kit is not for use
with the optional RAB Return Air Base.
3/4 (19)
one side return air.
A
B 9/16 (14)
11−5/8 (295)
Right
1
OPTIONAL
EXTERNAL
SIDE RETURN
AIR FILTER KIT
(Either Side)
9−3/4 (248)
Left
40
(1016)
14−3/4
(375)
16
(406)
AIR FLOW
5/8 (16)
C
*Bottom Return
Air Opening
3/4 (19)
FRONT VIEW SIDE VIEW
1
OPTIONAL
EXTERNAL
SIDE RETURN
AIR FILTER KIT
(Either Side)
5−1/2
(140)
6−1/2
(165)
4−1/8
(103)
6−3/4
(171)
4−7/8 (124) Right
2−1/4 (57) Left
2−1/2
(64)
18-3/4 (476)
6−1/2
(165)
3−1/8
(79)
4
(102)
4−1/4
(108)
SUPPLY AIR
OPENING
23-3/4 (603)
25 (635)
TOP VIEW
28−1/2
(724)
19−7/16
(378)
COMBUSTION AIR INTAKE
(Either Side)
EXHAUST AIR OUTLET
(Either Side)
GAS PIPING INLET
(Either Side)
CONDENSATE
TRAP CONNECTION
(Either Side)
ELECTRICAL INLET
(Either Side)
23
(584)
*OPTIONAL
RETURN CUTOUT
(Either Side)
1−15/16 (49)
23−1/2
(597)
*Bottom Return
Air Opening
9/16
(14)
14**
(356)
Model No.
G51MP−24B−045
G51MP−36B−045
G51MP−36B−070
G51MP−36C−090
G51MP−48C−090
G51MP−60C−090
G51MP−48C−110
G51MP−60C−110
G51MP−60D−135 24−1/2 622 23−3/8 546 23 584
in. mm in. mm in. mm
17−1/2 446 16−3/8 416 16 406
21 533 19−7/8 504 19−1/2 495
A B C
Page 2
G51MP Parts Arrangement
G51MP PARTS IDENTIFICATION
TOP CAP
BURNER BOX
ASSEMBLY
GAS VALVE
AND MANIFOLD
FLUE
COLLAR
COMBUSTION
AIR PRESSURE
PROVE SWITCHES
COMBUSTION AIR
INDUCER
DuralokPlus
HEAT EXCHANGER
ASSEMBLY
TM
CABINET
WARM HEADER
(COLLECTOR)
BOX
CONDENSER COIL
BURNER
ACCESS
PANEL
BLOWER
ACCESS
DOOR
SIGHT
GLASS
INTERLOCK
DOOR
SWITCH
PRIMARY LIMIT
COLD HEADER
(COLLECTOR)
BOX
SECONDARY
LIMITS (2)
BLOWER
ASSEMBLY
CONTROL BOX
FIGURE 1
Page 3
G51MP Gas Furnace
The G51MP Category IV gas furnace is shipped ready for
installation in the upflow, downflow, horizontal left air discharge or horizontal right air discharge position. The furnace is shipped with the bottom panel in place. The bottom panel must be removed if the unit is to be installed in
upflow applications with bottom return air. The bottom
panel must also be removed and discarded in all downflow
or horizontal applications.
The furnace is equipped for installation in natural gas applications. A conversion kit (ordered separately) is required for use in propane/LP gas applications.
The G51MP can be installed as either a Direct Vent or a
Non−Direct Vent gas central furnace.
NOTE − In Direct Vent installations, combustion air is taken
from outdoors and flue gases are discharged outdoors. In
Non−Direct Vent installations, combustion air is taken from
indoors and flue gases are discharged outdoors. See figure
2 for applications involving roof termination.
DIRECT VENT INSTALLATION NON−DIRECT VENT
COMBUSTION
AIR INTAKE
OUTSIDE OF
HOUSE
EXHAUST
OUTLET
INSTALLATION
EXHAUST
OUTLET
NOTE − G51MP−48C−110 and G51MP−60C−110 units also
include a 2" diameter PVC street elbow, which is shipped
on the blower deck in the heating compartment.
G51MP−60D−135 units are shipped with a 3" to 2" PVC reducing elbow.
Canadian Installations Only − Replace the provided 2"
street elbow shipped with the G51MP−48C−110 and
G51MP−60C−110 units with 2" street elbow Y0162. Replace the provided 3" X 2" reducing elbow shipped with the
G51MP−60D−135 units with 3" X 2" reducing elbow 40W22.
Y0162 and 40W22 meet B149 vent requirements.
Check equipment for shipping damage. If you find any
damage, immediately contact the last carrier.
The following items may also 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.
AIR INTAKE INSIDE
G51MP
CONDENSATE
DRAIN
FIGURE 2
Shipping and Packing List
Package 1 of 1 contains
1 − Assembled G51MP unit
1 − Bag assembly containing the following:
3 − Screws
3 − Wire nuts
1 − Snap bushing
1 − Snap plug
1 − Wire tie
1 − Condensate trap
1 − Condensate trap cap
2 − 2" diameter vent / intake plugs
1 − 3" diameter cabinet plug (intake)
1 − 2" diameter debris screen
COMBUSTION
OF HOUSE
G51MP
CONDENSATE
DRAIN
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.
Use only the type of gas approved for use with this furnace.
Refer to unit nameplate.
G51MP units are CSA International certified to ANSI
Z21.47 and CSA 2.3 standards.
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
Page 4
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.
In order to ensure proper unit operation in non−direct vent
applications, combustion and ventilation air supply must be
provided according to the current National Fuel Gas Code
or CSA-B149 standard.
This furnace is CSA International certified for installation
clearances to combustible material as listed on the unit
nameplate and in the tables in figures 8, 13 and 17. 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 and premature heat
exchanger failure.
This G51MP furnace may be used as a high−static unit
heater. The G51MP may also be installed in an aircraft hangar in accordance with the Standard for Aircraft Hangars
(ANSI/NFPA No. 408−1990).
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 accordance with the Standard for Repair Garages (ANSI/NFPA
No. 88B−1991).
This G51MP 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.
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 an intermittent 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.
The G51MP furnace may be installed in alcoves, closets,
attics, basements, garages, and utility rooms.
This furnace design has not been CSA 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.
Use of Furnace as Construction Heater
Lennox does not recommend the use of G51MP 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.
G51MP 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.
Page 5
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.
CAUTION
G51MP unit should not be installed in areas normally
subject to freezing temperatures.
Combustion, Dilution & Ventilation Air
If the G51MP is installed as a Non−Direct Vent Furnace, follow the guidelines in this section.
NOTE − In Non−Direct Vent installations, combustion air
is taken from indoors and flue gases are discharged out−
doors.
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 G51MP furnace:
• Place the furnace as close to the center of the air distribution 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 applications, 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 applications, do not block the furnace combustion air opening
with clothing, boxes, doors, etc. Air is needed for proper
combustion and safe unit operation.
• When the furnace is installed in an attic or other insulated space, keep insulation away from the furnace.
• When the furnace is installed in an unconditioned
space, consider provisions required to prevent freezing
of condensate drain system.
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
WARNING
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
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.
Page 6
In the absence of local codes concerning air for combus−
tion and ventilation, use the guidelines and procedures in
this section to install G51MP 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.
All gas-fired appliances require air for the combustion process. If sufficient combustion air is not available, the furnace or other appliance 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 required 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.
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 com−
bined 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.
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
(64516 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 3.
EQUIPMENT IN CONFINED SPACE − ALL AIR FROM INSIDE
ROOF TERMINATED
EXHAUST PIPE
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
infiltration. If the furnace is located in a building of tight
Page 7
OPENINGS
SIDE WALL
TERMINATED EX-
HAUST PIPE (ALTER-
NATE LOCATION)
NOTE − Each opening shall have a free area of at least one square
inch per 1,000 Btu (645mm
rating of all equipment in the enclosure, but not less than 100 square
inches (64516mm.
G51MP
2
2).
(To Adjacent
Unconfined
Space)
per .29kW) per hour of the total input
FIGURE 3
Air from Outside
If air from outside is brought in for combustion and ventilation, the confined space shall be provided with two
permanent openings. One opening shall be within 12"
(305mm) of the top of the enclosure and one within 12"
(305mm) 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 per 4,000 Btu
(645mm2 per 1.17kW) per hour of total input rating of all
equipment in the enclosure. When communicating with
the outdoors through horizontal ducts, each opening shall
have a minimum free area of 1 square inch per 2,000 Btu
(645mm2 per .59kW) per total input rating of all equipment
in the enclosure (See figure 4).
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.
EQUIPMENT IN CONFINED SPACE − ALL AIR FROM OUTSIDE
(All Air Through Ventilated Attic)
EQUIPMENT IN CONFINED SPACE − ALL AIR FROM OUTSIDE
(Inlet Air from Crawl Space and Outlet Air to Ventilated Attic)
VENTILATION LOUVERS
OUTLET
AIR
(Each end of attic)
VENTILATION
LOUVERS
(For unheated
crawl space)
2
per 1.17kW) per
ROOF TERMINATED
EXHAUST PIPE
SIDE WALL
TERMINATED
EXHAUST PIPE
(ALTERNATE
LOCATION)
G51MP
INLET
AIR
NOTE−The inlet and outlet air openings shall each have a free area
of at least one square inch per 4,000 Btu (645mm
hour of the total input rating of all equipment in the enclosure.
FIGURE 4
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 4 and 5. 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 6.
ROOF TERMINATED
EXHAUST PIPE
OUTLET
AIR
SIDE WALL
TERMINATED
EXHAUST PIPE
(ALTERNATE
LOCATION)
G51MP
NOTE−The inlet and outlet air openings shall each have a free area of
at least one square inch per 4,000 Btu (645mm
VENTILATION LOUVERS
(Each end of attic)
INLET AIR
(Ends 12" above
bottom)
2
per 1.17kW) per hour
of the total input rating of all equipment in the enclosure.
FIGURE 5
EQUIPMENT IN CONFINED SPACE −
ALL AIR FROM OUTSIDE
ROOF TERMINATED
EXHAUST PIPE
OUTLET AIR
SIDE WALL
TERMINATED
EXHAUST PIPE
(ALTERNATE
LOCATION)
NOTE−Each air duct opening shall have a free area of at least one
square inch per 2,000 Btu (645mm
G51MP
2
per .59kW) per hour of the total
INLET AIR
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 1 square inch per 4,000 Btu (645mm
2
per 1.17kW) per
hour of the total input rating of all other equipment in the enclosure.
FIGURE 6
Page 8
Installation − 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.
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,
condensate trap and drain connections, and installation
and service clearances [24 inches (610 mm) at unit
front]. The unit must be level from front to back and side
to side. The unit may be tilted slightly (maximum 1/2 in.)
from back to front to aid in the draining of the heat exchanger. See figure 7.
SETTING EQUIPMENT
UPFLOW APPLICATION DOWNFLOW APPLICATION
UNIT MUST BE LEVEL SIDE−TO−SIDE IN ALL APPLICATIONS.
HORIZONTAL APPLICATION
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.
NOTE − The G51MP−60D−135 units are equipped with a
shipping pad under the blower housing. Remove the shipping pad prior to opertion.
Allow for clearances to combustible materials as indicated
on the unit nameplate. Minimum clearances for closet or alcove installations are shown in figures 8, 13 and 17.
AIR FLOW
UNIT
FRONT
AIR FLOW
FRONT VIEW
AIR FLOW
SIDE VIEW
AIR FLOW
FRONT VIEW
UNIT
FRONT
1/2"
max.
1/2"
max.
UNIT SHOULD BE LEVEL FROM LEFT TO RIGHT BUT MAY BE
TILTED SLIGHTLY (MAX. 1/2") FROM BACK TO FRONT
TO AID IN THE DRAINING OF THE HEAT EXCHANGER.
END VIEW
FIGURE 7
UNIT
FRONT
FRONT VIEW
AIR FLOW
SIDE VIEW
1/2"
max.
Page 9
WARNING
Blower access panel must be securely in place when
blower and burners are operating. Gas fumes, which
could contain carbon monoxide, can be drawn into
living space resulting in personal injury or death.
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 air in the living space. Use sheet metal screws and
joint tape to seal return air system to furnace.
In platform installations with furnace return, 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.
For no reason should return and supply air duct systems ever 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.
Upflow Applications
The G51MP gas furnace can be installed as shipped in
the upflow position. Refer to figure 8 for clearances.
Installation Clearances
Top
Return Air −− Upflow Units
Return air can be brought in through the bottom or either
side of the furnace installed in an upflow application. If the
furnace is installed on a platform with bottom return, make
an airtight seal between the bottom of the furnace and the
platform to ensure that the furnace operates properly and
safely. The furnace is equipped with a removable bottom
panel to facilitate installation.
Markings are provided on both sides of the furnace cabinet
for installations that require side return air. Cut the furnace
cabinet at the maximum dimensions shown on page 2.
NOTE − When air volumes over 1800 cfm (850 L/s) are
required with 60C or 60D models in an upflow application, the following return air options are available:
1 − Return air from single side with transition which will
accommodate 20 x 25 x 1 in. (508 x 635 x 25 mm) air filter.
(Required to maintain proper air velocity.) See figure 9.
2 − Return air from single side with optional RAB Return
Air Base. See figure 11.
3 − Return air from bottom.
4 − Return air from both sides.
5 − Return air from bottom and
one side.
Refer to Engineering Handbook for additional information.
G51MP applications which include side return air and
a condensate trap installed on the same side of the
cabinet require either a return air base or field−fabricated transition to accommodate an optional IAQ accessory taller than 14.2".
Side Return Air
(with transition and filter)
Left Side
Bottom (Floor)
Top/Plenum 1 in. (25 mm)
*Front 0
Back 0
Sides 0†
Vent 0
Floor 0‡
*Front clearance in alcove installation must be 24 in. (610 mm).
Maintain a minimum of 24 in. (610 mm) for front service access.
†Allow proper clearances to accommodate condensate trap and
vent pipe installation.
‡For installations on a combustible floor, do not install the furnace
directly on carpeting, tile or other combustible materials other
than wood flooring.
Right Side
FIGURE 8
20" X 25" X 1"
(508mm X635mm X 25mm)
Air Filter
Return
Air
Plenum
Transition
FIGURE 9
Removing the Bottom Panel
Remove the two screws that secure the bottom cap to the
furnace. Pivot the bottom cap down to release the bottom
panel. Once the bottom panel has been removed, reinstall
the bottom cap. See figure 10.
Page 10
Removing the Bottom Panel
Screw
Bottom Panel
FIGURE 10
(Upflow Applications Only −− For use with B, C and D cabinets only)
Bottom Cap
Optional Return Air Base
Setting an Upflow Unit
When the side return air inlets are used in an upflow application, it may be necessary to install leveling bolts on the
bottom of the furnace. Use field−supplied corrosion−resistant 5/16 inch machine bolts (4) and nuts (8). See figure 12.
NOTE − The maximum length of the bolt is 1−1/2 inches.
1 − Lie the furnace on its back and drill a 5/16 inch diame-
ter hole in each corner of the furnace’s bottom. See figure 12 for the correct location of the holes. Drill through
the bottom panel and the bottom flange of the cabinet.
2 − Install one bolt and two nuts into each hole. Screw the
first nut onto a bolt and then insert the bolt into a hole. A
flat washer may be added between the nut and the bottom of the unit.
3 − Screw another nut onto the bolt on the inside of the fur-
nace base. A flat washer may be added between the
nut and the bottom of the unit.
1
23 (584)
Overall
(Maximum)
1
Unit side return air
Opening
5−5/8
(143)
SIDE RETURN
AIR OPENINGS
(Either Side)
23 (584)
27−5/8 (702)
SIDE VIEW
1
Minimum
11 (279)
2
Maximum
14 (356)
1
22−7−16
(570)
Overall
(Maximum)
AIR FLOW
17−1/2 (446) RAB−B (98M60)
21 (533) RAB−C (98M58)
24−1/2 (622) RAB−D (98M59)
FURNACE
FRONT
7−1/4 (184)
OPTIONAL RAB
RETURN AIR BASE
4
(102)
14
(356)
7/8
(22)
FRONT VIEW
NOTE− Optional Side Return Air Filter Kits are not for use with RAB Return Air Base.
1
Both the unit return air opening and the base return air opening must be covered by a single plenum or IAQ cabinet.
Minimum unit side return air opening dimensions for units requiring 1800 cfm or more of air (W x H): 23 x 11 in.
(584 x 279 mm).
The opening can be cut as needed to accommodate plenum or IAQ cabinet while maintaining dimensions shown.
Side return air openings must be cut in the field. There are cutting guides stenciled on the cabinet for the side return
air opening. The size of the opening must not extend beyond the markings on the furnace cabinet..
2
To minimize pressure drop, the largest opening height possible (up to 14 inches) is preferred.
NOTE− Optional Side Return Air Filter Kits are not for use with RAB Return Air Base.
FIGURE 11
3/4
(19)
Page 11
4 − Adjust the outside nut to the appropriate height and
tighten the inside nut to secure the arrangement.
NOTE − The unit may be tilted back−to−front a maximum of
1/2". This will ensure proper draining of the heat exchanger.
Downflow Application Installation Clearances
Top
Leveling Bolt Installation
Inches (mm)
3/8
(10)
Furnace Front
3/8
(10)
1−3/4
(44)
Furnace
1−3/4
(44)
Leveling Bolt
Locations
Bottom
Leveling Bolt
Locations
3/8
(10)
1−3/4
(44)
1−3/4 (44)
3/8
(10)
FIGURE 12
Downflow Applications
The unit may be installed three ways in downflow applications: 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 in the down-
flow position. Flange damage will result.
Refer to figure 13 for clearances in downflow applications.
Left Side
Bottom
Top 0
*Front 0
Back 0
Sides 0†
Vent 0
Floor NC‡
*Front clearance in alcove installation must be 24 in. (610 mm).
Maintain a minimum of 24 in. (610 mm) for front service access.
†Allow proper clearances to accommodate condensate trap and
vent pipe installation.
‡The furnace may be installed on a combustible wood floor if an optional additive base is installed between the furnace and the combustible floor.
Right Side
FIGURE 13
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
Cabinet Width
Front to Rear Side to Side
in. mm in. mm
B Cabinet (17.5") 19 − 3/4 502 16 − 5/8 422
C Cabinet (21") 19 − 3/4 502 20−1/8 511
D Cabinet (24.5") 19 − 3/4 502 23 − 5/8 600
Page 12
Installation on Combustible Flooring
(Using an Additive Base)
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. 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.
TABLE 2
ADDITIVE BASE FLOOR OPENING SIZE
Cabinet
Width
B Cabinet
(17.5")
C Cabinet
(21")
Catalog
Number
11M60
11M61
Front to Rear Side to Side
in. mm in. mm
22 559 18 − 3/4 476
22 559 22 − 3/4 578
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.
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 15 or 16).
2 − Sealing strips should be used to ensure an airtight seal
between the cabinet and the plenum.
3 − In all cases, plenum should be secured to top of fur-
nace using sheet metal screws.
4 − Make certain that an adequate seal is made.
D Cabinet
(24.5")
11M62
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.
G51MP UNIT
SUPPLY AIR PLENUM
PROPERLY
SIZED FLOOR
OPENING
ADDITIVE BASE
PLENUM
(Field Provided)
SEALING STRIP
(Field Provided)
PLENUM
(Field Provided)
SECURE FROM
INSIDE CABINET
SECURE FROM
OUTSIDE CABINET
CABINET
SIDE PANEL
Side View
FIGURE 15
SEALING STRIP
(Field Provided)
CABINET
SIDE PANEL
Side View
FIGURE 16
FIGURE 14
Page 13
Horizontal Applications
The G51MP furnace can be installed in horizontal applications with either right− or left−hand air discharge.
Horizontal Application
Installation Clearances
Right−Hand Discharge
Top
Left End
Bottom (Floor)**
Left−Hand Discharge
Top
Left End
Bottom (Floor)**
Top 0
Front* 0
Back 0
Ends 0
Vent 0
Floor 0‡
*Front clearance in alcove installation must be 24 in. (610 mm).
Maintain a minimum of 24 in. (610 mm) for front service access.
**A 5−1/2 service clearance must be maintained below the unit to
provide for servicing of the condensate trap.
‡For installations on a combustible floor, do not install the furnace
directly on carpeting, tile or other combustible materials other
than wood flooring.
FIGURE 17
The G51MP may also be installed as a unit heater. Either
suspend the furnace as shown in figure 18, or install the
furnace on a field−fabricated raised platform. The unit
must be supported at both ends and beneath the blower
deck to prevent sagging.
Refer to figure 17 for clearances in horizontal applications.
Right End
Right End
Suspended Installation of Horizontal Unit
NOTE − If unit is suspended, horizontal support kit (Cat No.
56J18 ordered separately) or equivalent is recommended
to ensure proper unit support and coil drainage.
1 − Select location for unit keeping in mind service and
other necessary clearances. See figure 17.
2 − Provide service platform in front of unit.
3 − If unit is installed above finished space, fabricate a
drain pan fitted with a 1/2 inch or 3/4 inch N.P.T. fitting.
4 − Using 3/8 inch rods and support frame kit (ordered
separately), fabricate suspension hangers for unit
keeping in mind front service access clearances.
5 − Mount unit on support frame as shown in figure 18.
6 − Continue with exhaust, condensate and intake line
piping instructions.
BLOWER ACCESS PANEL 3/8 in. RODS
INTAKE/EXHAUST
CONNECTION
SUPPORT FRAME
DRAIN PAN
(to protect finished space)
FIGURE 18
7 − If unit is suspended above finished space, hang the
field−provided drain pan below the support frame as
shown in figure 18. Leave 5−1/2 inches for service
clearance below unit for condensate trap.
8 − Route auxiliary drain line so that water draining from
this outlet will be easily noticed by the homeowner. If
necessary, run the condensate line into a condensate
pump to meet drain line slope requirements. The
pump must be rated for use with condensing furnaces.
Protect the condensate discharge line from the pump
to the outside to avoid freezing.
Platform Installation of Horizontal Unit
1 − Select location for unit keeping in mind service and
other necessary clearances. See figure 17.
2 − Construct a raised wooden frame and cover frame
with a plywood sheet. Provide a service platform in
front of unit. If unit is installed above finished space,
fabricate a drain pan to be installed under unit.
When installing the unit in a crawl space, a proper sup-
port platform may be created using cement blocks and
the horizontal support frame kit (ordered separately,
Page 14
Lennox part number 56J18). Position the support
frame on top of the blocks and install the unit on the
frame. Leave 5−1/2 inches for service clearance for
condensate trap.
EXHAUST PIPE
INTAKE PIPE
*Gas connector may be
used for Canadian
installation if acceptable by local authority
having jurisdiction.
*GAS
CONNECTOR
Unit Heater Discharge Duct Guidelines
A field−fabricated and installed discharge air duct and grille
cabinet is suitable for use with the G51MP heater. See figure 20. Keep the following items in mind when constructing
the cabinet.
1 − Outer dimensions of cabinet should match those of the
unit heater, so the duct/grille cabinet installs flush with
the unit heater cabinet. See figure 20.
2 − Flange both ends of duct/grille cabinet so that screws
can be used to secure cabinet to discharge end of unit
heater.
3 − To ensure proper operation, the duct/grille cabinet
must be at least 18 inches long.
RAISED
PLATFORM
CONDENSATE LINE
SERVICE PLATFORM
FIGURE 19
3 − Route auxiliary drain line so that water draining from
this outlet will be easily noticed by the homeowner. If
necessary, run the condensate line into a condensate
pump to meet drain line slope requirements. The
pump must be rated for use with condensing furnaces.
Protect the condensate discharge line from the pump
to the outside to avoid freezing.
4 − Set unit in drain pan as shown in figure 19. Leave 5−1/2
inches for service clearance below unit for condensate
trap.
5 − Continue with exhaust, condensate and intake piping
installation according to instructions.
G51MP Installed in Unit Heater Applications
Horizontal unit heaters may be installed either suspended
from the ceiling using the support frame kit or mounted on a
field−fabricated raised platform. The condensate trap must
be installed where it can be serviced at a later date.
The G51MP may also be installed as a unit heater. Either
suspend the furnace from roof rafters or floor joists, as
shown in figure 18, or install the furnace on a field−fabricated raised platform, as shown in figure 19. The unit must
be supported at both ends and beneath the blower deck to
prevent sagging.
4 − Use #10−16 x 1/2 inch sheet metal screws to secure
duct/grille cabinet to unit, taking care not to damage internal components of unit heater when drilling holes or
installing screws. See figure 20.
5 − Use adjustable, double−deflection grille(s) to distribute
discharge air. Adjust static pressure to be in the 0.06
inch to 0.10 inch w.c. range.
18 in.
MIN.
DRAIN PAN
(to protect
finished
space)
NOTE − When installing duct/grille cabinet, take care not to damage internal unit
heater components when drilling holes or installing screws.
FIGURE 20
Return Air −− Horizontal Applications
Return air may be brought in only through the end of a furnace installed in the horizontal position. The furnace is
equipped with a removable bottom panel to facilitate
installation. See figure 10.
Page 15
Filters
This unit is not equipped with a filter or rack. A field−provided filter is required for the unit to operate properly. Table
3 lists recommended filter sizes.
A filter must be in place whenever the unit is operating.
TABLE 3
Furnace
Cabinet Width
17−1/2" 16 X 25 X 1 (1) 16 X 25 X 1 (1)
21" 16 X 25 X 1 (1) 20 X 25 X 1 (1)
24−1/2" 16 X 25 X 1 (2) 24 X 25 X 1 (1)
Side Return Bottom Return
Filter Size
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.
NOTE − Operation of this furnace in heating mode (indoor
blower operating at selected heating speed) with an external static pressure which exceeds 0.5 inches w.c. may result in erratic limit operation.
Supply Air Plenum
If the furnace is installed without a cooling coil, a removable
access panel should be installed in the supply air duct. The
access panel should be large enough to permit inspection
(by reflected light) of the heat exchanger for leaks after the
furnace is installed. The furnace access panel must always
be in place when the furnace is operating and it must not
allow leaks into the supply air duct system.
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 pres-
sure 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.
Return air can be brought in through the bottom or either
side of the furnace. If a furnace with bottom return air is
installed on a platform, make an airtight seal between the
bottom of the furnace and the platform to ensure that the
unit operates properly and safely. Use fiberglass sealing
strips, caulking, or equivalent sealing method between the
plenum and the furnace cabinet to ensure a tight seal. If a
filter is installed, size the return air duct to fit the filter frame.
Pipe & Fittings Specifications
All pipe, fittings, primer and solvent cement must conform
with American National Standard Institute and the American Society for Testing and Materials (ANSI/ASTM) standards. The solvent shall be free flowing and contain no
lumps, undissolved particles or any foreign matter that adversely affects the joint strength or chemical resistance of
the cement. The cement shall show no gelation, stratification, or separation that cannot be removed by stirring. Refer to the table 4 below for approved piping and fitting materials.
TABLE 4
PIPING AND FITTINGS SPECIFICATIONS
PIPE & FITTING MATERIAL
Schedule 40 PVC (Pipe) D1785
Schedule 40 PVC (Cellular Core Pipe) F891
Schedule 40 PVC (Fittings) D2466
Schedule 40 CPVC (Pipe) F441
Schedule 40 CPVC (Fittings) F438
SDR−21 PVC or SDR−26 PVC (Pipe) D2241
SDR−21 CPVC or SDR−26 CPVC (Pipe) F442
Schedule 40 ABS Cellular Core DWV (Pipe) F628
Schedule 40 ABS (Pipe) D1527
Schedule 40 ABS (Fittings) D2468
ABS−DWV (Drain Waste & Vent)
(Pipe & Fittings)
PVC−DWV (Drain Waste & Vent)
Pipe & Fittings)
PRIMER & SOLVENT CEMENT
PVC & CPVC Primer F656
PVC Solvent Cement D2564
CPVC Solvent Cement F493
ABS Solvent Cement D2235
PVC/CPVC/ABS All Purpose Cement For Fittings & Pipe of the same material
ABS to PVC or CPVC Transition Solvent
Cement
CANADA PIPE & FITTING & SOLVENT
CEMENT
PVC & CPVC Pipe and Fittings
PVC & CPVC Solvent Cement
ABS to PVC or CPVC Transition Cement
ASTM
SPECIFICATION
D2661
D2665
ASTM
SPECIFICATION
D2564, D2235,
F493
D3138
MARKING
ULCS636
CAUTION
Solvent cements for plastic pipe are flammable liquids and should be kept away from all sources of
ignition. Do not use excessive amounts of solvent
cement when making joints. Good ventilation should
be maintained to reduce fire hazard and to minimize
breathing of solvent vapors. Avoid contact of cement
with skin and eyes.
Page 16
Use PVC primer and solvent cement or ABS solvent cement
meeting ASTM specifications, refer to Table 4. As an alternate, use all purpose cement, to bond ABS, PVC, or CPVC
pipe when using fittings and pipe made of the same materials. Use transition solvent cement when bonding ABS to either PVC or CPVC.
Low temperature solvent cement is recommended. Metal or
plastic strapping may be used for vent pipe hangers. Uniformly apply a liberal coat of PVC primer for PVC or use a
clean dry cloth for ABS to clean inside socket surface of fitting and male end of pipe to depth of fitting socket.
TABLE 5
OUTDOOR TERMINATION KITS AND CORRESPONDING EQUIVALENCIES
Vent Pipe Length Equivalency (feet)
Outdoor Ex-
haust Accel-
erator
(Dia. X
Length)
1−1/2"
Concentric
Kit
UNIT
MODEL
VENT
PIPE
DIA.
(in.)
Outdoor Ex-
haust Accel-
erator
(Dia. X
Length)
Canadian Applications Only − Pipe, fittings, primer
and solvent cement used to vent (exhaust) this appliance must be certified to ULC S636 and supplied by a
single manufacturer as part of an approved vent (exhaust) system. When bonding the vent system to the furnace, use ULC S636 approved One−Step Transition Cement to bond the pipe to the flue collar, or to bond the 90°
elbow or reducing 90° elbow to the flue collar. In addition, the first three feet of vent pipe from the furnace flue
collar must be accessible for inspection.
Table 5 lists the available exhaust termination kits, as well
as vent pipe equivalencies which must be used when sizing vent pipe. All Lennox vent terminations are PVC.
2" Con-
centric Kit
3" Con-
centric Kit
2" Wall Plate
Kit
3" Wall Plate
Kit
Ring Kit
2" Wall
1−1/2" X 12"
2 4
24B−045
36B−045
36B−070
36C−090
48C−090
60C−090
48C−110
60C−110
60D−135
*Requires field−provided and installed 1−1/2" exhaust accelerator.
**Requires field−provided and installed 2" exhaust accelerator.
***For use only in non−direct vent applications, when snow riser is not required. Requires field−provided and installed 2" exhaustaccelerator.
2−1/2 5
3 7
4 14
2 4
2−1/2 5
3 8
4 14
2
2−1/2
3
4
2
2−1/2
3
4
3
4
Not
Allowed
Not
Allowed
Not
Allowed
Not
Allowed
Not
Allowed
Not
Allowed
Not
Allowed
Not
Allowed
Not
Allowed
Not
Allowed
2" X 12"
Not
Allowed
Not
Allowed
Not
Allowed
Not
Allowed
Not
Allowed
Not
Allowed
Not
Allowed
Not
Allowed
1
2
2
4
1
2
2
4
6
10
71M80
or 44W92
12
15
21
42
12
15
24
42
Not
Allowed
Not
Allowed
Not
Allowed
Not
Allowed
Not
Allowed
Not
Allowed
Not
Allowed
Not
Allowed
Not
Allowed
Not
Allowed
69M29
or 44W92
Not
Allowed
Not
Allowed
Not
Allowed
Not
Allowed
Not
Allowed
Not
Allowed
Not
Allowed
Not
Allowed
3 3
6 6
6 6
12 12
3 3
6 6
6 6
12 12
Not
Allowed
Not
Allowed
Termination kits 44W92 (includes 1−1/2" reducer), 44W93, 30G28 and
81J20 approved for use in Canadian installations.
60L46
or 44W93
Not
Allowed
Not
Allowed
Not
Allowed
Not
Allowed
Not
Allowed
Not
Allowed
Not
Allowed
Not
Allowed
15
25
22G44
or 30G28
4 4* 4
5 5* 5
7 7* 7
14 14* 14
4 4* 4
5 5* 5
8 8* 8
14 14* 14
Not
Allowed
Not
Allowed
Not
Allowed
Not
Allowed
Not
Allowed
Not
Allowed
Not
Allowed
Not
Allowed
Not
Allowed
Not
Allowed
44J40
or 81J20
1 1**
2 2**
2 2**
4 4**
1 1**
2 2***
2 2***
4 4***
6 6***
10 10***
15F74
Page 17
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