Lennox G61MPVT-36B-070, G61MPVT-60C-090, G61MPVT-60C-110, G61MPVT-60D-135 Installation Instructions Manual
INSTALLATION
E 2006 Lennox Industries Inc.
Dallas, Texas, USA
RETAIN THESE INSTRUCTIONS
FOR FUTURE REFERENCE
INSTRUCTIONS
G61MPVT SERIES UNITS
GAS UNITS
505,187M
06/2009
Table of Contents
Unit Dimensions 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
G61MPVT Parts Arrangement 3. . . . . . . . . . . . . . . . . . .
Shipping and Packing List 4. . . . . . . . . . . . . . . . . . . . . . .
Safety Information 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation − Setting Equipment 5. . . . . . . . . . . . . . . . . .
Filters 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Duct System 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pipe & Fittings Specifications 10. . . . . . . . . . . . . . . . . . .
Vent Piping Guidelines 11. . . . . . . . . . . . . . . . . . . . . . . . .
Joint Cementing Procedure 12. . . . . . . . . . . . . . . . . . . . .
Venting Practices 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Gas Piping 21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrical 23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Integrated Control Board 27. . . . . . . . . . . . . . . . . . . . . . .
Unit Start−Up 34. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Gas Pressure Adjustment 35. . . . . . . . . . . . . . . . . . . . . .
Manifold Pressure & High Altitude Information 35. . . .
Other Unit Adjustments 36. . . . . . . . . . . . . . . . . . . . . . . .
Heating Sequence of Operation 37. . . . . . . . . . . . . . . . .
Service 38. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Requirements 40. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
General 40. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Combustion, Dilution & Ventilation Air 41. . . . . . . . . . . .
Ignition Control Board Diagnostic Codes 44. . . . . . . . .
Troubleshooting 45. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Repair Parts List 51. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Vent Pipe Sizing Worksheet 51. . . . . . . . . . . . . . . . . . . .
Start−Up & Performance Check List 52. . . . . . . . . . . . . .
Litho U.S.A.
Failure to follow safety warnings exactly could result in serious injury, death,
or property damage.
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.
06/09
*2P0609*
WARNING
FIRE OR EXPLOSION HAZARD.
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
505,187M
*P505187M*
G61MPVT Unit Dimensions − mm
*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
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.
one side return air.
1
OPTIONAL
EXTERNAL
SIDE RETURN
AIR FILTER KIT
(Either Side)
SUPPLY AIR
OPENING
603
635
TOP VIEW
19
A
B
14
1
OPTIONAL
EXTERNAL
SIDE RETURN
AIR FILTER KIT
(Either Side)
40
(1016)
295 Right
248 Left
165
103
124 Right
57 Left
140
171
165
79
724
COMBUSTION AIR INTAKE
(Either Side)
EXHAUST AIR OUTLET
(Either Side)
GAS PIPING INLET
(Either Side)
CONDENSATE
TRAP CONNECTION
(Either Side)
ELECTRICAL INLET
(Either Side)
64
AIR FLOW
C
*Bottom Return
Air Opening
19
375
16
406
476
RECEPTACLE
102
IEC
108
584
*OPTIONAL
RETURN CUTOUT
(Either Side)
597
*Bottom Return
Air Opening
FRONT VIEW SIDE VIEW
378
14
356**
49
Model No.
G61MPVT−36B−070 446 416 406
G61MPVT−60C−090
G61MPVT−60C−110
G61MPVT−60D−135 622 594 584
A B C
mm mm mm
533 454 495
Page 2
G61MPVT Parts Arrangement
BURNER BOX
ASSEMBLY
GAS VALVE
AND MANIFOLD
FLUE
COLLAR
TOP CAP
DuralokPlus
HEAT EXCHANGER
ASSEMBLY
TM
CABINET
COMBUSTION
AIR PRESSURE
PROVE SWITCHES
COMBUSTION AIR
INDUCER
BURNER
ACCESS
PANEL
BLOWER
ACCESS
PANEL
SIGHT
GLASS
DOOR
INTERLOCK
SWITCH
Two−Stage, Variable Speed
Integrated Control Board
WARM HEADER
(COLLECTOR)
BOX
CONDENSER COIL
PRIMARY LIMIT
COLD HEADER
(COLLECTOR)
BOX
SECONDARY
LIMITS (2)
BLOWER MOTOR
TRANSFORMER
CONTROL BOX
FIGURE 1
Page 3
G61MPVT Gas Furnace
The G61MPVT gas furnace is equipped with a two−stage,
variable speed integrated control. This control ensures
compatibility with a thermostat which provides humidity
control. Each G61MPVT 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.
All G61MPVT models can be installed as a Direct Vent
gas central furnace. G61MPVT−070, −090 and −110 models can be installed as 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
Shipping and Packing List
Package 1 of 1 contains
1 − Assembled G61MPVT 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)
2 − 2" diameter debris screen
1 − Bag assembly containing the following:
1− 50 hertz power wiring harness
NOTE − G61MPVT−60C−110 and −60D−135 units also include two 50mm to 80mm diameter ABS street elbows and
two 80mm to 50mm ABS reducing elbows, which are
shipped on the blower deck in the heating compartment.
The following items may also be ordered separately:
1 − Thermostat
1 − Propane/LP changeover kit
Check equipment for shipping damage. If you find any
damage, immediately contact the last carrier.
Safety Information
CONDENSATE
DRAIN
G61MPVT
FIGURE 2
COMBUSTION
AIR INTAKE INSIDE
OF HOUSE
G61MPVT
CONDENSATE
DRAIN
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 qualified installer, 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.
Page 4
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.
Upflow Applications
The G61MPVT gas furnace can be installed as shipped
in the upflow position. Refer to figure 3 for clearances.
Installation Clearances
Top
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 [610 mm (24 inches) at unit
front]. The unit must be level from front to back and side
to side.
NOTE − G61MPVT−36B units with 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 removed before the furnace is placed into operation. After the bolt and washer have been removed, the rig-
id leg will not touch the blower housing.
NOTE − G61MPVT−60D−135 units are equipped with a
shipping pad under the blower housing. Remove the shipping pad prior to operation.
Allow for clearances to combustible materials as indicated
on the unit nameplate. Minimum clearances for closet or alcove installations are shown in figures 3, 9 and 6.
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.
Left Side
Bottom (Floor)
Top/Plenum 25 mm (1 in.)
*Front 0
Back 0
Sides 0†
Vent 0
Floor 0‡
*Front clearance in alcove installation must be 610 mm (24 inches). Maintain a minimum of 610 mm (24 inches) 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 3
Return Air −− Upflow Units
NOTE − G61MPVT−135 models are not approved for
installation in upflow air discharge applications.
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 850 L/s (1800 cfm) 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 ac-
commodate508 x 635 x 25 mm (20 x 25 x 1 in.) air filter.
(Required to maintain proper air velocity.) See figure 4.
2 − Return air from single side.
3 − Return air from bottom.
4 − Return air from both sides.
Page 5
5 − Return air from bottom and one side.
Refer to Engineering Handbook for additional information.
G61MPVT 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 368mm (14.5 inches).
Side Return Air
(with transition and filter)
508mm X635mm X 25mm
(20" X 25" X 1")
Air Filter
Return
Air
Plenum
Horizontal Applications
G61MPVT furnaces, with the exception of the
G61MPVT−60D−135, can be installed in horizontal applications with either right− or left−hand air discharge. The
G61MPVT−60D−135 can only be installed in horizontal applications with right−hand air discharge.
Refer to figure 6 for clearances in horizontal applications.
Horizontal Application
Installation Clearances
Right−Hand Discharge
Top
Left End Right End
Bottom (Floor)**
Left−Hand Discharge
Top
Left End Right End
Transition
FIGURE 4
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 5.
Removing the Bottom Panel
Screw
Bottom Cap
Bottom Panel
Bottom (Floor)**
Top 0
Front* 0
Back 0
Ends 0
Vent 0
Floor 0‡
*Front clearance in alcove installation must be 610 mm (24 inches). Maintain a minimum of 610mm (24 inches) for front service access.
**A 140mm (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 6
This furnace may be installed in either a roof space or under floor. Install the furnace on a field−fabricated raised
platform, as shown in figure 7. The unit must be supported
at both ends and beneath the blower deck to prevent sagging.
NOTE − In horizontal applications, the unit must be level side−to−side. The unit may be tilted back−to−front a
maximum of 25mm (1 inch) to ensure proper draining
of the heat exchanger. The heat exchanger coil will not
drain properly if the unit is tilted backward.
FIGURE 5
Page 6
TYPICAL HORIZONTAL ROOF SPACE INSTALLATION (FORCED AIR FURNACE)
INTAKE PIPE
NOTE − Condensate trap and
condensate line must be
protected by self−regulating
heating cable and insulation
when run through unconditioned
spaces.
CONDENSATE LINE
FIGURE 7
Platform Installation of Horizontal Unit in Roof Space
1 − Select location for unit keeping in mind service and
other necessary clearances. See figure 6.
2 − Construct a raised wooden frame and cover frame
with a plywood sheet. Provide a service platform for
unit. A drain pan is also recommended.
EXHAUST PIPE
INTAKE
PIPE
GAS
CONNECTOR
RAISED PLATFORM
SERVICE PLATFORM
EXHAUST
PIPE
3 − Route auxiliary drain line so that water draining from
this outlet will be easily noticed by the homeowner.
4 − Set unit in drain pan (if used) as shown in figure 7. Unit
must be level to ensure proper coil drainage. Leave
140mm (5−1/2 inches) for service clearance below unit
for condensate trap.
5 − Continue with exhaust, condensate and intake piping
installation according to instructions.
Platform Installation of Horizontal
Unit Installed Under Floor
1 − Select location for unit, keeping in mind service and
other clearances.
EVAPORATOR COIL
FIGURE 8
2 − After positioning cement blocks, mount support frame
on top of blocks and install unit. Unit must be level to
ensure proper heat exchanger coil drainage. Leave
140mm (5−1/2 inches) for service clearance) for condensate trap.
3 − Install exhaust and intake piping according to informa-
tion given in following section.
Page 7
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 5.
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 9 for clearances in downflow applications.
Downflow Application Installation Clearances
Top
Left Side
Right Side
3 − Set the unit over the plenum and seal the plenum to
the unit.
4 − Ensure that the seal is adequate.
TABLE 1
NON−COMBUSTIBLE FLOOR OPENING SIZE
Model No.
B Cabinet (445mm) 19 − 3/4 502 16 − 5/8 422
C Cabinet (533mm) 19 − 3/4 502 20−1/8 511
D Cabinet (622mm) 19 − 3/4 502 23 − 5/8 600
NOTE − Floor opening dimensions listed are 1/4 inch (6 mm) larger than
the unit opening. See dimension drawing on page 2.
Front to Rear Side to Side
in. mm in. mm
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 B cabinet 445mm − # 11M60
D C cabinet 533mm − # 11M61
D D cabinet 622mm − # 11M62
See table 2 for opening size to cut in floor.
Bottom
Top 0
*Front 0
Back 0
Sides 0†
Vent 0
Floor NC‡
*Front clearance in alcove installation must be 610mm (24 inches).
Maintain a minimum of 610mm (24 inches) 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.
FIGURE 9
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.
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
Model
B Cabinet (445mm)
C Cabinet (533mm)
D Cabinet (622mm)
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.
Front to Rear Side to Side
in. mm in. mm
22 559 18 − 3/4 476
22 559 22 − 3/4 578
22 559 25 − 3/4 654
Page 8
G61MPVT UNIT
PLENUM
(Field Provided)
SEALING STRIP
(Field Provided)
SUPPLY AIR PLENUM
PROPERLY
SIZED FLOOR
OPENING
ADDITIVE BASE
FIGURE 10
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
Return air may be brought in only through the top opening
of a furnace installed in the downflow position.The following steps should be taken when installing plenum:
1 − Bottom edge of plenum should be flanged with a
hemmed edge (See figure 11 or 12).
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.
PLENUM
(Field Provided)
SEALING STRIP
(Field Provided)
Side View
SECURE FROM
OUTSIDE CABINET
CABINET
SIDE PANEL
FIGURE 11
CABINET
SECURE FROM
INSIDE CABINET
Side View
SIDE PANEL
FIGURE 12
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 minimum filter sizes.
A filter must be in place when the unit is operating.
NOTE − In upflow applications where side return air filter is installed on same side as the condensate trap, filter rack must be installed beyond condensate trap to
avoid interference.
TABLE 3
Furnace
Cabinet Size
445mm 406 X 635 X 25 (1) 406 X 635 X 25 (1)
533mm 406 X 635 X 25 (1) 508 X 635 X 25 (1)
622mm 406 X 635 X 25 (2) 610 X 635 X 25 (1)
Side Return Bottom Return
Filter Size −− mm
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 200 Pa (0.8 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
(either by smoke or reflected light) of the heat exchanger
for leaks after the furnace is installed. If present, this 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
Return air must not be drawn from a room where this
furnace, or any other gas appliance (ie., a water heater), 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
Page 9
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 and fittings to be Pressure Pipe, Class E /
Class 12 / Schedule 40 or equivalent
All pipe, fittings, primer and solvent cement must conform
OUTDOOR TERMINATION KITS AND CORRESPONDING EQUIVALENCIES
Outdoor Exhaust Accel-
erator
(Dia. X
Length)
40mm X
305mm
Not
Allowed
Not
Allowed
Not
Allowed
Not
Allowed
Not
Allowed
Not
Allowed
Not
Allowed
UNIT
MODEL
−070
−090
−110
−135
VENT
PIPE
DIA.
(in.)
50mm 1.2
80mm 2.4
100mm 4.3
50mm
80mm
100mm
80mm
100mm
80mm
100mm
*Requires field−provided and installed 40mm exhaust
accelerator.
Outdoor Ex-
haust Accel-
erator
(Dia. X
Length)
50mm X
305mm
Not
Allowed
Not
Allowed
Not
Allowed
0.3
0.6
1.2
0.6
1.2
1.8
3.0
Concentric
(1−1/2")
71M80 60M29 60L46 22G44 44J40 15F74
Allowed
Allowed
Allowed
Allowed
Allowed
Allowed
Allowed
TABLE 4
Vent Pipe Length Equivalency (meters)
40mm
Kit
3.6
7.3
12.8
Not
Not
Not
Not
Not
Not
Not
with Australian 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.
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.
Table 4 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 or ABS.
50mm (2")
Concentric
Kit
Not
Allowed
Not
Allowed
Not
Allowed
.9 .9
1.8 1.8
3.7 3.7
1.8 1.8
3.7 3.7
Not
Allowed
Not
Allowed
**Requires field−provided and installed 50mm exhaust
accelerator.
80mm (3")
Concentric
Kit
Not
Allowed
Not
Allowed
Not
Allowed
4.6
7.6
50mm (2")
Wall Plate
Kit
1.2 1.2* 1.2
2.4 2.4* 2.4
4.3 4.3* 4.3
Not
Allowed
Not
Allowed
Not
Allowed
Not
Allowed
Not
Allowed
Not
Allowed
Not
Allowed
80mm (3")
Wall Plate
Kit
0.3 0.3**
0.6 0.6**
1.2 1.2**
0.6 0.6
1.2 1.2
1.8
3.0
50mm (2")
Wall Ring
Kit
Not
Allowed
Not
Allowed
Page 10
Vent Piping Guidelines
G61MPVT furnaces, with the exception of the
G61MPVT−60D−135, can be installed as either a Non−Direct Vent or a Direct Vent gas central furnace. The
G61MPVT−60D−135 can only be installed as a Direct
Vent (two pipe) gas central furnace.
NOTE − In Non-Direct Vent installations, combustion air is
taken from indoors and flue gases are discharged outdoors.
In Direct Vent installations, combustion air is taken from outdoors and flue gases are discharged outdoors.
Intake and exhaust pipe sizing in Direct Vent applications
and exhaust pipe sizing in Non-Direct Vent applications −−
Size pipe according to tables 5 and 6. Table 5 lists the minimum equivalent vent pipe lengths permitted. Table 6 lists
the maximum equivalent pipe lengths permitted.
Maximum vent length is defined as:
Total length (linear meters) of pipe,
Plus Equivalent length (meters) of fittings,
Plus Equivalent length (meters) of termination.
NOTE − Include ALL pipe and ALL fittings, both in
doors and outdoors.
Regardless of the diameter of pipe used, the standard roof
and wall terminations described in section Exhaust Piping
Terminations should be used. Exhaust vent termination
pipe is sized to optimize the velocity of the exhaust gas as
it exits the termination. Refer to table 7.
NOTE − The exhaust pipe should be offset a minimum of
305mm (12 inches) to avoid the possibility of water droplets
being released from the exhaust termination. The minimum exhaust vent length is 4.5m (15 feet). Shorter exhaust
vent lengths may result in the discharge of water droplets
from the exhaust termination, in spite of the 305mm
(12−inch) vertical offset.
Each 90° elbow (including those provided with the furnace)
of any diameter is equivalent to 1.5m (5 feet ) of vent pipe of
the same diameter. Two 45° elbows are equivalent to one
90° elbow of the same diameter. One 45° elbow is equal to
.76m (2.5 feet) of vent pipe of the same diameter.
In some applications which permit the use of several different sizes of vent pipe, a combination vent pipe may be
used. Contact Lennox for assistance in sizing vent pipe in
these applications.
NOTE − The flue collar on all models is sized to accommodate 50mm Schedule 40 / Class 12 / Class E pressure
pipe. When vent pipe which is larger than 50mm must be
used in an upflow application, a 50mm elbow must be applied at the flue collar in order to properly transition to the
larger diameter flue pipe. This elbow must be added to
the elbow count used to determine acceptable vent
lengths. Assign an equivalent meter value to this elbow
according to the larger size pipe being used. Contact
Lennox for more information concerning sizing of vent
systems which include multiple pipe sizes.
305mm Min.
Upflow and Downflow Application
Rooftop Termination
305mm Min.
Horizontal Application
Rooftop Termination
Exhaust Pipe Offset
305mm Min.
Upflow and Downflow Application
Side Wall Termination
305mm Min.
Horizontal Application
Side Wall Termination
FIGURE 13
Page 11
Use the following steps to correctly size vent pipe diameter.
Refer to Vent Pipe Size Determination Worksheet on
page 52.
1 − Determine the vent termination and its corresponding
equivalent meter value per table 6.
2 − Determine the number of 90° elbows required for both
indoor and outdoor use. Calculate the corresponding
equivalent meters of vent pipe.
3 − Determine the number of 45° elbows required for both
indoor and outdoor use. Calculate the corresponding
equivalent meters of vent pipe.
4 − Determine the length of straight pipe required.
5 − Add the total equivalent meters calculated in steps 1
through 4 and compare that length to the maximum
values given in table 6 for the proposed vent pipe diameter. If the total equivalent length required exceeds
the maximum equivalent length listed in the appropriate table, evaluate the next larger size pipe.
TABLE 5
MINIMUM VENT PIPE LENGTHS
G61MPVT
MODEL
070, 090
110***
135***
*Any approved termination may be added to the minimum equivalent length
listed.
**G61MPVT−60C−110 and G61MPVT−60D−135 must have 90° street ell (supplied) installed directly into unit flue colla and 50mm to 80mm reducer (supplied) must be installed on the 50mm ell.
NOTE − All 90° elbows used in configuration of vent, must be sweep el-
bows.
MIN. EQUIV.
VENT LENGTH
4.5m*
EXAMPLE
1.5m plus 2 elbows of 50mm or
80mm diameter pipe
1.5m plus 2 elbows of 80mm
diameter pipe
1.5m plus 2 elbows of 80mm
diameter pipe
TABLE 6
MAXIMUM VENT PIPE LENGTHS
MAXIMUM EQUIVALENT VENT
ALTITUDE
0 − 610m
611 −1372m
n/a −− Not allowed.
*G61MPVT−60C−110 and G61MPVT−60D−135 must have 90° street ell (sup-
plied) installed directly into unit flue colla and 50mm to 80mm reducer (supplied) must be installed on the 50mm ell.
NOTE − All 90° elbows used in configuration of vent, must be sweep el-
bows.
G61MPVT
MODEL
070 12.2 16.1 44
090 4.5 12.2 34.5
110* n/a 12.2 30
135* n/a 7.6 20
070 7.6 10 27.5
090 n/a 7.6 21.5
110* n/a 7.6 18.7
135* n/a n/a n/a
LENGTH METERS
50mm
dia.
80mm
dia.
100mm
dia.
IMPORTANT
The G61MPVT unit is not suitable for use at elevations over 610m.
Joint Cementing Procedure
All cementing of joints should be done according to the
relevant local authority.
WARNING
DANGER OF EXPLOSION!
Fumes from PVC glue may ignite during system
check. Allow fumes to dissipate for at least 5 minutes
before placing unit into operation.
1 − Measure and cut vent pipe to desired length.
2 − Debur and chamfer end of pipe, removing any ridges
or rough edges. If end is not chamfered, edge of pipe
may remove cement from fitting socket and result in a
leaking joint.
3 − Clean and dry surfaces to be joined.
4 − Test fit joint and mark depth of fitting on outside of pipe.
5 − Uniformly apply liberal coat of PVC primer for PVC or
ABS cleaner for ABS to inside socket surface of fitting
and male end of pipe to depth of fitting socket.
6 − Promptly apply solvent cement to end of pipe and in-
side socket surface of fitting. Cement should be applied lightly but uniformly to inside of socket. Take
care to keep excess cement out of socket. Apply second coat to end of pipe.
NOTE − Time is critical at this stage. Do not allow primer to dry before applying cement.
7 − Immediately after applying last coat of cement to pipe,
and while both inside socket surface and end of pipe
are wet with cement, forcefully insert end of pipe into
socket until it bottoms out. Turn pipe 1/4 turn during assembly (but not after pipe is fully inserted) to distribute
cement evenly.
NOTE − Assembly should be completed within 20 seconds after last application of cement. Hammer blows
should not be used when inserting pipe.
8 − After assembly, wipe excess cement from pipe at end
of fitting socket. A properly made joint will show a
bead around its entire perimeter. Any gaps may indicate a defective assembly due to insufficient solvent.
9 − Handle joints carefully until completely set.
Page 12
Venting Practices
1 − Use recommended piping materials for exhaust piping
(Class E / Class 12 / Schedule 40).
2 − Secure all joints so that they are gas-tight using ap-
proved cement.
downflow positions. Exhaust piping exits from the top
of the unit in horizontal air discharge applications.
Glue the field−provided exhaust vent pipe (or provided
street ell or reducing ell in upflow or downflow applications) to the flue collar. Refer to pipe and fittings specifications and gluing procedures.
Suspend piping using hangers at a minimum of every
1.52m (5 feet) for Schedule
40 vent pipe. A suitable
hanger can be fabricated
by using metal or plastic
strapping or a large wire tie.
3 − In areas where piping
penetrates joists or interior walls, hole must be large enough to allow clearance
on all sides of pipe through center of hole using a
hanger.
4 − Isolate piping at the point where it exits the outside wall
or roof in order to prevent transmission of vibration to
the structure.
5 − When furnace is installed in a residence where unit is
shut down for an extended period of time, such as a
vacation home, make provisions for draining condensate collection trap and lines.
Exhaust Piping (Figures 15 and 16)
NOTE − Two 50mm diameter street ells and two 80mm to
50mm reducers are contained in a bag assembly
strapped to the blower deck of 60C−110 and 60D−135
units. The street ells must be
flue collar. See figure 15. The 80mm to 50mm reducers
must be glued to the street ells in upflow or downflow
applications.
1 − Choose the appropriate side for venting in upflow or
glued directly into the unit
STRAPPING
(metal, plastic
or large wire
ties)
FIGURE 14
IMPORTANT
Exhaust piping and condensate trap must be
installed on the same side of the unit in upflow and
dowflow applications.
2 − All horizontal runs of exhaust pipe must slope back to-
ward unit. A minimum of 6mm (1/4") drop for each
305mm (12 inches) of horizontal run is mandatory for
drainage. Horizontal runs of exhaust piping must be supported every 1.5m (5 feet) using hangers.
NOTE − Exhaust piping should be checked carefully to
make sure there are no sags or low spots.
3 − On the opposite side of the cabinet, glue the provided
50mm vent plug into the unused flue collar.
4 − Route piping to outside of structure. Continue with
installation following instructions given in piping termination section.
CAUTION
Do not discharge exhaust into an existing stack or
stack that also serves another gas appliance. If vertical discharge through an existing unused stack is required, insert PVC pipe inside the stack until the end
is even with the top or outlet end of the metal stack.
CAUTION
The exhaust vent pipe operates under positive pressure and must be completely sealed to prevent leakage of combustion products into the living space.
Page 13
TYPICAL EXHAUST PIPE CONNECTIONS AND CONDENSATE TRAP INSTALLATION
IN UPFLOW OR DOWNFLOW DIRECT OR NON−DIRECT VENT APPLICATIONS
(Right−Hand Exit in Upflow Application Shown)
80mm
PLUG
VENT PLUG
(Must be
glued in
place)
PLUG
*50mm diameter street elbow provided.
**80mm diameter reducing elbow provided.
***Limit pipe length to 50mm.
PLUG
50mm
CONDENSATE
TRAP
(Must be installed
on same side as
exhaust piping)
50mm
50mm
FIGURE 15
TYPICAL EXHAUST PIPE CONNECTIONS
HORIZONTAL DIRECT OR
NON−DIRECT VENT APPLICATIONS
(Horizontal Right−Hand Air Discharge Application Shown)
*Limit pipe length to
50mm in G61MPVT−110
and −135 applications.
DO NOT transition from
smaller to larger pipe
size in horizontal runs.
80mm
TRANSITION
50mm
50mm
50mm
G61MPVT−36B−070
G61MPVT−60C−090
G61MPVT−60C−110*
G61MPVT−60D−135*
50mm
G61MPVT−36B−070
G61MPVT−60C−090
FIGURE 16
TRANSITION
50mm
50mm
50mm
80mm
TRANSITION
50mm***
50mm*
G61MPVT−110
with
80mm vent pipe
G61MPVT−070
or 090 with 80mm
vent pipe
80mm
80mm**
G61MPVT−135
with
80mm vent pipe
Intake Piping
G61MPVT furnaces, with the exception of the
G61MPVT−60D−135, can be installed as either a Non−Direct Vent or a Direct Vent gas central furnace. The
G61MPVT−60D−135 can only be installed as a Direct
Vent (two pipe) gas central furnace. In non−direct vent ap-
plications, when intake air will be drawn into the furnace
from the surrounding space, the indoor air quality must be
considered and guidelines listed in Combustion, Dilution
and Ventilation Air section must be followed.
The G61MPVT unit is designed for either left−side or right−
side air intake connections in either upflow or downflow applications. In horizontal applications, air intake must be
brought in through the top. Intake air piping is independent
of exhaust piping.
Follow the next four steps when installing the unit in direct
vent applications, where combustion air is taken from
outdoors and flue gases are discharged outdoors.
1 − Cement intake piping in slip connector located on the
side of the burner box.
2 − Use a sheet metal screw to secure the intake pipe to
the connector, if desired. A pilot indentation is provided in the slip connector to assist in locating and
starting the fastener.
3 − Glue the provided 50mm plug into the unused air intake
connector on the opposite side of the cabinet.
4 − Route piping to outside of structure. Continue with
installation following instructions given in general
guide lines for piping terminations and in intake and
exhaust piping terminations for direct vent sections.
Refer to figure 17 for pipe sizes.
Page 14
TYPICAL AIR INTAKE PIPE CONNECTIONS
UPFLOW OR DOWNFLOW DIRECT VENT APPLICATIONS
(Right−Hand Exit in Upflow Application Shown)
50mm
PLUG
(Must be
glued in
place)
50mm
50mm
G61MPVT−36B−070
G61MPVT−60C−090
FIGURE 17
TYPICAL AIR INTAKE PIPE CONNECTIONS
HORIZONTAL DIRECT VENT APPLICATIONS
(Horizontal Right−Hand Air Discharge Application Shown)
80mm
TRANSITION
80mm
50mm*
50mm*
TRANSITION
50mm*
50mm
G61MPVT−36B−070
G61MPVT−60C−090
G61MPVT−60C−110*
G61MPVT−36B−070
G61MPVT−60C−090
G61MPVT−60C−110*
G61MPVT−60D−135*
*Limit pipe length to
50mm in G61MPVT−110
and −135 applications.
Follow the next three steps when installing the unit in NonDirect Vent applications where combustion air is taken
from indoors and flue gases are discharged outdoors.
*Limit pipe
length to 50mm in
G61MPVT−110
and −135
applications.
G61MPVT−36B−070
G61MPVT−60C−090
G61MPVT−60C−110*
G61MPVT−36B−070
G61MPVT−60C−090
G61MPVT−60C−110*
G61MPVT−60D−135*
50mm
G61MPVT−36B−070
G61MPVT−60C−090
50mm*
50mm*
TRANSITION
50mm*
TRANSITION
50mm
50mm
80mm
80mm
50mm
TYPICAL AIR INTAKE PIPE CONNECTIONS
UPFLOW OR HORIZONTAL NON−DIRECT
(Right−Hand Exit in Upflow Application Shown)
PLUG
(Must be
glued in
place)
NOTE − Debris screen and elbow may be rotated, so that
screen may be positioned to face forward, backward or
downward.
VENT APPLICATIONS
156mm Max.
INTAKE
DEBRIS
SCREEN
(Provided)
FIGURE 18
FIGURE 19
Page 15
TYPICAL AIR INTAKE PIPE CONNECTIONS
DOWNFLOW NON−DIRECT VENT APPLICATIONS
(Right−Hand Exit in Downflow Applications Shown)
50mm
SWEEP
ELL
INTAKE
DEBRIS
SCREEN
(Provided)
PLUG
(Must be
glued in
place)
150mm Max.
INTAKE DEBRIS
SCREEN
(Provided)
Downflow
Evaporator
Coil
FIGURE 20
1 − Use field−provided materials and the factory−provided
air intake screen to route the intake piping as shown in
figures 19 and 20. Maintain a minimum clearance of
76mm (3 inches) around the air intake opening. The
air intake opening (with the protective screen) should
always be directed either downward or straight out.
Use 50mm pipe and fittings only and make sure that
the air intake does not extend more than 156mm
(6inches) beyond the G61MPVT cabinet.
The air intake connector must not be located near
the floor. To avoid this complication in downflow
applications which do not include a downflow
evaporator coil, the intake air routing should be modi-
fied as shown in figure 20.
2 − Use a sheet metal screw to secure the intake pipe to the
connector, if desired. A pilot indentation is provided in the
slip connector to assist in locating and starting the fastener.
3 − Glue the provided 50mm plug into the unused air intake
connector on the opposite side of the cabinet.
PLUG
(Must be
glued in
place)
NOTE − Debris screen and sweep ell may be rotated, so that
screen may be positioned to face forward, backward or to the side.
50mm
50mm SWEEP ELL
Downflow Additive Flloor Base
438mm
Testing for Proper Venting and Sufficient Combustion Air
(Non−Direct Vent Applications Only)
WARNING
CARBON MONOXIDE POISONING HAZARD!
Failure to follow the steps outlined below for each
appliance connected to the venting system being
placed into operation could result in carbon monoxide poisoning or death.
The following steps shall be followed for each appliance connected to the venting system being
placed into operation, while all other appliances connected to the venting system are not in operation.
After the G61MPVT gas furnace has been started, the following test should be conducted to ensure proper venting
and sufficient combustion air has been provided to the
G61MPVT, as well as to other gas-fired appliances which
are separately vented. The test should be conducted
while all appliances (both in operation and those not in operation) are connected to the venting system being tested.
Page 16
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