INSTALLATION
E2012 Lennox Industries Inc.
Dallas, Texas, USA
RETAIN THESE INSTRUCTIONS
FOR FUTURE REFERENCE
SLO183UFV SERIES UNITS ARE NOT FOR
USE IN ZONING APPLICATIONS!
WARNING
Improper installation, adjustment, alteration, service, or maintenance can cause injury or property
damage. Refer to this manual. For assistance or
additional information, consult a licensed professional installer, or equivalent, or service agency.
WARNING
Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other
appliance.
CAUTION
When venting this appliance, keep vent terminal
free of snow, ice and debris.
CAUTION
As with any mechanical equipment, personal injury
can result from contact with sharp sheet metal
edges. Be careful when you handle this equipment.
INSTRUCTIONS
SLO183UFV Series Units
OIL UNITS
506904−01
04/2012
Table of Contents
General 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Shipping & Packing List 1. . . . . . . . . . . . . . . . . . . . . . . .
SLO183UFV Unit Dimensions 2. . . . . . . . . . . . . . . . . . .
SLO183UFV Unit Parts Arrangement 3. . . . . . . . . . . .
SLO183UFV Oil Burner Parts Arrangement 3. . . . . . . . .
Requirements 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Combustion & Ventilation Air 5. . . . . . . . . . . . . . . . . . . .
Locate & Level the Unit 6. . . . . . . . . . . . . . . . . . . . . . . .
Adjustments 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Venting 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Flue Connections 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Supply & Return Air Plenums 10. . . . . . . . . . . . . . . . . . .
Oil Supply Line Sizing 10. . . . . . . . . . . . . . . . . . . . . . . . . .
Oil Supply Line & Filter Connections 11. . . . . . . . . . . . .
Leak Check 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrical 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Blower Control 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Unit Start Up & Adjustments 19. . . . . . . . . . . . . . . . . . . .
Service 20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Burner Control 21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Troubleshooting 22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
General
These instructions are intended as a general guide and do
not supersede local codes in any way. Only licensed professional technicians, or equivalent, can install and service
the Dave Lennox Signaturet Collection SLO183UFV oil
furnaces. In Canada, refer to CSA B139 for recommended
installation procedures. Consult authorities who have jurisdiction before installation.
CAUTION
Never burn garbage or paper in the heating system.
Never leave papers near or around the unit.
Shipping & Packing List
1 − Assembled oil furnace
1 − Barometric draft control
1 − Oil nozzle (used with SLO183UF86, −114 and −150
only)
Check the components for shipping damage. If you find
any damage, immediately contact the last carrier.
Litho U.S.A.
04/12
*2P0412*
Page 1
506904−01
*P506904-01*
SLO183UFV Unit Dimensions − Inches (mm)
3/4 (19)
3/4 (19)
SIDE FLUE OUTLET
CENTERING HOLE
(Field Fabricate Either Side)
ELECTRICAL INLET
(Right Side Only)
OIL PIPING INLET
(Left Side Only)
OPT. OUTDOOR COMBUSTION
AIR INLET CENTERING HOLE
(Field Fabricate Right Side only)
RETURN AIR OPENING
(Either Side)
1-1/2 (38)
D
C
SUPPLY
AIR
OPENING
TOP VIEW
22
(559)
14
(356)
TOP FLUE OUTLET
FLUE
CONNECTION
(On Heat
Exchanger)
54
(1372)
1-1/2
(38)
23-1/2
(597)
AB
AIR FLOW
2 (51)
1-1/4 (32)
RETURN AIR SIDE VIEW
SLO183UFV Unit Dimensions − Inches (mm)
SLO183UFV
Model
68/86V36
101/114V42
135/150V60
A B C D E
19−1/2
(495)
22−1/2
(572)
30−5/8
(778)18(457)
33−1/8
(841)21(533)
19−5/8
(498)16(406)
22−1/8
(562)18(457)
22
(559)
Figure 1
E
RETURN AIR FRONT VIEW
Page 2
SLO183UFV Unit Parts Arrangement
FLUE
COLLAR
HEAT
EXCHANGER
CLEAN−
OUT PORT
LIMIT SWITCH
BECKETT
AFG BURNER
CLEAN−
OUT PORT
OBSERVATION
PORT
VARIABLE
SPEED BLOWER
MOTOR
CAPACITORBLOWER CONTROL
INDOOR BLOWER
Figure 2
SLO183UFV AFG Burner Parts Arrangement
MAIN
HEAT
SHIELD
AIR TUBE WITH
ELECTRODE
ASSEMBLY AND
NOZZLE INSIDE
COPPER OIL
TUBE
HOUSING
ESCUTCHEON
PLATE
OIL DELAY
VALV E
FUEL PUMP
Figure 3
AIR BAND AND
AIR SHUTTER
IGNITER
BLOWER WHEEL
WITH AIR GUIDE
(Inside housing)
BURNER CONTROL
(with Reset Button)
BLOWER
MOTOR
Page 3
Requirements
Table 1
Combustion Air Opening Dimensions
WARNING
This product contains fiberglass wool.
Disturbing the insulation during installation, maintenance, or repair will expose you to fiberglass wool
dust. 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
Installation of Lennox oil−fired furnaces must conform with
the National Fire Protection Association Standard for the
Installation of Oil Burning Equipment, NFPA No. 31, the
National Electrical Code, ANSI/NFPA No.70 (in the
U.S.A.), CSA Standard CAN/CSA−B139 (in Canada),
Installation Code for Oil Burning Equipment, the Canadian
Electrical Code Part1, CSA 22.1 (Canada), the recommendations of the National Environmental Systems Contractors Association and any state or provincial laws or local ordinances. Authorities having jurisdiction should be
consulted before installation. Such applicable regulations
or requirements take precedence over general instructions
in this manual.
Chimneys and chimney connectors must be of the type
and construction outlined in section 160 of NFPA No. 31.
Air for combustion and ventilation must conform to standards outlined in section 140 of NFPA No. 31 or, in Canada, CSA Standard B139. When installing SLO183UFV
units in confined spaces such as utility rooms, two combustion air openings are required. Dimensions of combustion air openings are shown in table 1. One opening shall
be below burner level and the other opening shall be no
more than 6" (152 mm) from the room’s ceiling.
The combustion air opening should provide a minimum free
area one-half square inch per 1,000 Btu per hour input. This
combustion air should be brought into the area containing the
furnace below the level of the furnace burner.
Model No. (2 openings required)
SLO183UFV−68/86
& 101/114
SLO183UFV−135/150 11" X 22" (279 mm X 559 mm)
This unit is approved for use on combustible flooring and for
clearances to combustible material as listed on unit rating
plate and in table 2. Unit service and accessibility clearances
take precedence over fire protection clearances.
10" X 20" (254 mm X 508 mm)
Table 2
SLO183UFV Installation Clearances
Clearances inches (mm)
top of plenum & duct 2 (51)
plenum sides 3 (76)
sides 0 (0)
rear 0 (0)
front 4 (120)
flue pipe 6 (152)
NOTE − When service clearances are greater than fire
protection clearances, service clearances take precedence.
Obtain a temperature rise within the range listed in table 8
in the Start-Up section of this manual.
When installed, furnace must be electrically grounded in
accordance with local codes or, in the absence of local
codes, with the current National Electric Code, ANSI/
NFPA No. 70, or Canadian Electric Code (CEC) if an external electrical source is utilized.
Field wiring connection with unit must meet or exceed
specifications of type T wire and withstand a 63_F (17_C)
temperature rise.
If installing a programmable thermostat, use a type which
retains its memory in event of a power loss.When the furnace is used in conjunction with cooling units, it shall be
installed in parallel with, or on the upstream side of, cooling
units to avoid condensation in the heating element. With a
parallel flow arrangement, a damper (or other means to control the flow of air) shall be adequate to prevent chilled air
from entering the furnace and, if manually operated, must be
equipped with means to prevent operation of either unit, unless damper is in the full heat" or cool" position.
IMPORTANT
An opening to the outside for combustion air is
strongly recommended, especially in new homes.
Refer to table 1 or the unit rating plate for specific
combustion air opening dimensions.
WARNING
When an air conditioning unit is used in conjunction with the furnace, the evaporator coil must be
installed in the discharge (supply) air. Do not install
an evaporator coil in the return air; excessive condensation will occur within the furnace.
Page 4
Notice to Home Owner
This furnace is equipped with safety devices that protect
you and your property. If one or more of these devices is
activated, furnace operation will stop. If your home is left
unattended for an extended period of time, equipment operation must be checked periodically. If this is not possible,
the water supply to the house should be shut off and the
pipes should be drained. This will prevent problems
associated with a NO HEAT condition (frozen pipes, etc.)
Combustion and Ventilation Air
Homes built with energy conservation in mind use tight
construction practices. These houses are sealed so well
that it becomes necessary to provide a means of bringing
in air from outside for combustion. Also, 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 home for combustion, negative pressure (pressure outside is greater than inside pressure) will build to the point that a down draft can occur in the
furnace vent pipe or chimney. Combustion gases enter the
living space creating a potentially dangerous situation. Negative pressure may also interfere with proper combustion, causing sooting within the heat exchanger.
The importance of the previous paragraph cannot be overstated. Users may inadvertently block fresh air intakes after installation.
In the absence of local codes concerning air for combustion and ventilation, the following section outlines guidelines and recommends procedures for operating oil furnaces in a manner that ensures efficient and safe
operation. Special consideration must be given to combustion air needs as well as requirements for exhaust vents
and oil piping.
Combustion Air Requirements
CAUTION
Insufficient combustion air can cause headaches,
nausea, dizziness or asphyxiation. It will also cause
excess water in the heat exchanger resulting in rusting and premature heat exchanger failure. It can also
cause property damage.
All oil-fired appliances require air to be used for the combustion process. If sufficient amounts of combustion air
are not available, the furnace or other appliance will operate in an inefficient and unsafe manner. Enough air must
be provided to meet the needs of all fuel-burning appliances, as well as appliances such as exhaust fans which
force air out of the home. 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 down-draft situation. Insufficient amounts
of air also cause incomplete combustion which can result
in sooting. Requirements for providing air for combustion
and ventilation depend largely on whether the furnace is
installed in an unconfined or confined space.
Unconfined Space
An unconfined space is an area such as a basement or
large equipment room with a volume greater than 50 cubic
feet (1.4 cubic meters) per 1,000 Btu (293 W) 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
construction with weather stripping and caulking around
the windows and doors, follow the procedures outlined for
using air from the outside for combustion and ventilation.
Confined Space
A confined space is an area with volume less than 50 cubic
feet (1.4 cubic meters) per 1,000 Btu (293 W) per hour of
the combined input rating of all appliances installed in that
space. This definition includes furnace closets or small
equipment rooms.
When the furnace is installed so that supply ducts carry air
circulated by the furnace to areas outside the space containing the furnace, the return air must be handled by ducts
which are sealed to the furnace casing and which terminate outside the space containing the furnace. This is especially important when the furnace is mounted on a platform in a confined space such as a closet or small
equipment room. Even a small leak around the base of the
unit at the platform or at the return air duct connection can
cause a potentially dangerous negative pressure condition. Air for combustion and ventilation can be brought into
the confined space either from inside the building or from
outside.
Air from an Adjacent Space
If the confined space housing the furnace adjoins 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 (6.4 square centimeters) per 1,000 Btu (293 W) per
hour of the total input rating of all fuel-fired equipment in the
confined space. Each opening must be at least 100 square
inches (614.5 square centimeters). One opening shall be
within 12" (305 mm) of the top of the enclosure and one
opening within 12" (305 mm) of the bottom (See figure 1).
Page 5
Equipment In Confined Space
All Air From Inside
Chimney or
t
Oil Ven
Oil
Furnace
NOTE−Each opening shall have a free area of at least 1 square inch
(6.4 square centimeters) per 1,000 Btu (293 W) per hour of the total
input rating of all equipment in the enclosure, but not less than 100
square inches (614.5 square centimeters).
Water
Heater
Openings
(To Adjacent Room)
Figure 1
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" (305 mm)
of the top of the enclosure and one within 12" (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 (6.4 square centimeters) per 4,000
Btu (1172 W) per hour of total input rating of all equipment
in the enclosure. (See figure 2.) When communicating with
the outdoors through horizontal ducts, each opening shall
have a minimum free area of 1 square inch (6.4 square
centimeters) per 2,000 Btu (586 W) per total input rating of
all equipment in the enclosure (See figure 3).
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" (76 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
Chimney
Or Oil
Vent
Oil
Furnace
NOTE−Each air duct opening shall have a free area of at least one
square inch (6.4 square centimeters) per 2,000 Btu (586 W) per hour of
the total input rating of all equipment in the enclosure. If the equipment
room is located against an outside wall and the air openings communicate directly with the outdoors, each opening shall have a free area of at
least one square inch (6.4 square centimeters) per 4,000 Btu (1172 W)
per hour of the total input rating of all other equipment in the enclosure.
Water
Heate
r
Outlet Air
Inlet Air
Figure 3
Equipment In Confined Space
All Air From Outside
(Inlet Air from Crawl Space and Outlet Air to
Ventilated Attic)
Chimney or
Oil Vent
Ventilation Louvers
(Each End Of Attic)
Oil
Furnace
Ventilation
Louvers
(For unheated
crawl space)
NOTE−The inlet and outlet air openings shall each have a free area of at
least one square inch (6.4 square centimeters) per 4,000 Btu (1172 W)
per hour of the total input rating of all equipment in the enclosure.
Outlet
Ai
r
Water
Heater
Inlet
Air
Figure 2
CAUTION
Combustion air openings in the front of the furnace
must be kept free of obstructions. Any obstruction
will cause improper burner operation and may result in a fire hazard or injury.
CAUTION
The barometric draft control shall be in the same atmospheric pressure zone as the combustion air inlet to the furnace. Deviation from this practice will
cause improper burner operation and may result in
a fire hazard or injury.
Locate & Level the Unit
Set the unit in desired location keeping in mind the clearances listed in table 2. Also keep in mind oil supply connections, electrical supply, flue connections and sufficient clearance for installing and servicing unit.
Page 6
Level the unit from side to side and from front to rear. If the
furnace is not level, place fireproof wedges or shims between the low side of the furnace and the floor. Make sure
the weight of the furnace is distributed evenly on all four
corners. Strain on sides of cabinet causing cracking and
popping noises may occur if weight of furnace is not evenly
distributed.
Adjustments
Neither the nozzle setting nor the air adjustments are factory set. The furnace is fire−tested and the limit control is
checked to make sure it functions properly; no factory settings are made. During installation, the furnace must be
set up." The installing dealer/contractor must have and
use proper test equipment in order to correctly set up the
oil furnace. Proper testing equipment is required to ensure
correct operation of the unit. The use of test equipment is
now more critical than ever due to tighter tolerances needed to keep the furnace operating efficiently.
Among the test equipment for an oil furnace, the proper
combustion test kit should contain the following:
S Draft gauge
S CO
or O2 analyzer
2
S Smoke tester
S Pressure gauge
S High temperature thermometer
S Beckett T−501 or Z−2000 nozzle gauge
S Oil vacuum gauge
S Knowledge of proper test equipment operation
CAUTION
Improper nozzle and/or air adjustment of this unit
may result in sooting problems. Refer to the following section for correct adjustment procedures.
Adjusting the Nozzle
Proper adjustment of the nozzle assembly is critical. Before
the flue pipe and oil lines are installed, the nozzle assembly
must be checked for proper depth and alignment. You must
remove the entire burner assembly (not just the nozzle) from
the furnace to check the nozzle depth and alignment. The
smaller sized firing nozzle has been factory−installed. This
should be verified by the installer. A larger nozzle has been
provided in the bag assembly for use with SLO183UFV86,
114 and 150 units. Inspect the spark transformer leads also
to ensure they are still attached to the electrodes.
The burner assembly is attached to the vestibule panel by
three nuts. Slots are provided in the mounting flange for removing the burner assembly from the vestibule. Loosen
the nuts and turn the whole burner assembly clockwise
(figure 4) to remove the entire burner assembly from the
furnace. There is adequate wire to remove the burner without disconnecting wires. Once removed, turn the burner
around in the vest panel area.
SLO183UFV Series Burner Removal
First, loosen three nuts which
attach burner to vest panel.
Next, rotate burner clockwise
on slots then pull toward you.
Figure 4
To correctly check and adjust the nozzle depth and alignment, use the Beckett T−501 or Z−2000 gauge.
To check the oil nozzle depth, insert the small end of the
gauge into the end of the cone and measure from the flat of
the end cone to the face of the nozzle. When nozzle depth
is correct, the tip of the nozzle should just touch the end of
the gauge. Refer to the illustration sheet provided with the
gauge. Note that the scale side of the gauge is not used for
this purpose. If necessary, loosen the escutcheon plate securing screw and slide the entire nozzle assembly forward
or backward within the air tube (figure 5). Re−secure escutcheon plate screw when adjustment is completed.
To check nozzle alignment, again insert the small end of
gauge into the end cone and measure the nozzle and
electrode alignment against the center lines marked on
the gauge (again refer to enclosed illustration sheet). If
the nozzle is not centered, but found to be too far left or
right, a new nozzle assembly will need to be ordered. Do
not attempt to adjust by bending the 90 degree elbow in
the oil line.
Take care to properly re−install burner assembly when
nozzle adjustment has been completed.
Beckett Oil Burner Nozzle Adjustment
Burner must be removed from
furnace for this procedure.
T−501 Gauge
To Adjust Nozzle
1−Loosen escutcheon plate screw.
2−Slide entire nozzle/electrode assembly back and forth inside air
tube until nozzle just touches gauge.
2
1
Escutcheon Plate
Figure 5
Page 7
Indoor Coil Placement
In cooling / heat pump applications, Lennox recommends
that the indoor coil be installed at least 4 inches above the top
of the furnace cabinet to allow proper airflow. If coil cabinet
does not provide proper clearance, use field−fabricated transition.
Venting
WARNING
Combustion air openings in front of the furnace
must be kept free of obstructions. Any obstruction
will cause improper burner operation and may result in a fire hazard.
WARNING
The barometric draft control shall be in the same atmospheric pressure zone as the combustion air inlet to the furnace. Deviation from this practice will
cause improper burner operation and may result in
a fire hazard.
3 − The vent connector should not be smaller than the
outlet diameter of the vent outlet of the furnace.
4 − Pipe should be at least 24 gauge galvanized.
5 − Single wall vent pipe should not run outside or through
any unconditioned space.
6 − Chimney should extend 3 feet (0.9 m) above highest
point where the vent passes through the roof, and 2
feet (0.6 m) higher than any portion of a building within
a horizontal distance of 10 feet (3 m).
7 − The vent must not pass through a floor or ceiling.
Clearances to single wall vent pipe should be no less
than 6" (152 mm); more if local codes require it.
8 − The vent may pass through a wall where provisions
have been made for a thimble as specified in the Standards of the National Board of Fire Underwriters. See
figure 4.
Wall Thimble
Thimble
CAUTION
Do not store combustible materials near the furnace
or supply air ducts. The material (such as paint, motor oil, gasoline, paint thinner, etc.) may ignite by
spontaneous combustion creating a fire hazard.
WARNING
This furnace is certified for use with type L" vent.
B" vent must not be used with oil furnaces.
Prior to installation of unit, make a thorough inspection of the
chimney to determine whether repairs are necessary. Make
sure the chimney is properly constructed and sized according to the requirements of the National Fire Protection
Association. The smallest dimensions of the chimney
should be at least equal to the diameter of the furnace vent
connector. Make sure the chimney will produce a steady
draft sufficient to remove all the products of combustion
from the furnace. A draft of at least .04" w.c. (9.9 Pa) is required during burner operation.
1 − Local building codes may have more stringent instal-
lation requirements and should be consulted before
installation of unit.
2 − The vent connector should be as short as possible to
do the job.
Combustible
Wall
Vent Pipe
Figure 4
9 − The vent pipe should slope upward toward the chim-
ney on horizontal run at least 1/4 inch (6 mm) to the
foot (0.3 m) and should be supported by something
other than the furnace, such as isolation hangers.
10 − Extend the vent pipe into the chimney so that it is flush
with the inside of the chimney liner. Seal the joint between the pipe and the liner.
11 − The furnace shall be connected to either a factory−
built chimney or vent which complies with a recognized standard, or to a masonry or concrete chimney
which has been lined with a material acceptable to the
authority having jurisdiction.
12 − When two or more appliances vent into a common
vent, the area of the common vent should not be less
than the area of the largest vent or vent connection
plus 50% of the area of the additional vent or vent connection. Chimney must be able to sufficiently vent all
appliances operating at the same time.
Page 8
Factory−Built Chimney
Barometric Draft
Control*
(in either location)
*Barometric draft control may be installed in either vertical or horizontal section of flue pipe no less than 12" and no more than 18"
from furnace flue outlet.
Factory−
Built
Chimney
Condensate
Drain
Figure 5
Masonry Chimney
Barometric
Draft
Control*
(in either
location)
Clean Out
*Barometric draft control may be installed in either vertical or horizontal section of flue pipe no less than 12" and no more than 18"
from furnace flue outlet.
Liner
Masonry
Chimney
Figure 6
13 − The vent pipe shall not be connected to a chimney
vent serving a solid fuel appliance or any mechanical
draft system.
14 − All unused chimney openings should be closed.
15 − All vent pipe run through unconditioned areas or out-
side shall be constructed of factory−built chimney sections. See figure 5.
16 − Where condensation of vent gas is apparent, the vent
should be repaired or replaced. Accumulation of condensation in the vent is unacceptable.
17 − Vent connectors serving this appliance shall not be
connected into any portion of mechanical draft systems operating under positive pressure.
18 − Keep the area around the vent terminal free of snow,
ice and debris.
NOTE − If vent pipe needs to exit from side of cabinet,
use the pilot hole (located on either side of the unit) to
cut a 6" (152 mm) round hole. Attach finishing plate
(provided) with four sheet metal screws to cover rough
edges.
Removal of Unit from Common Venting System
In the event that an existing furnace is removed from a
venting system commonly run with separate appliances,
the venting system is likely to be too large to properly vent
the remaining attached appliances. The following test
should be conducted while each appliance is in operation
and the other appliances not in operation remain connected to the common venting system. If venting system
has been installed improperly, the system must be corrected as outlined in the previous section.
1 − Seal any unused openings in the common venting
system.
2 − Visually inspect venting system for proper size and
horizontal pitch and determine there is no blockage or
restriction, leakage, corrosion or other deficiencies
which could cause an unsafe condition.
3 − Insofar as is practical, close all building doors and win-
dows and all doors between the space in which the appliances remaining connected to the common venting
system are located and other spaces of the building.
Turn on clothes dryers and any appliances not connected to the common venting system. Turn on any
exhaust fans, such as range hoods and bathroom exhausts, so they will operate at maximum speed. Do
not operate a summer exhaust fan. Close fireplace
dampers.
4 − Following the lighting instruction on the unit, place the
appliance being inspected in operation. Adjust thermostat so appliance will operate continuously.
5 − Test for spillage using a draft gauge.
6 − After it has been determined that each appliance re-
maining connected to the common venting system
properly vents when tested as outlined above, return
doors, windows, exhaust fans, fireplace dampers and
any other fuel burning appliance to its previous condition of use.
7 − If improper venting is observed during any of the
above tests, the common venting system must be corrected.
Flue Connections
IMPORTANT
When flue pipe is installed at less than minimum
clearance listed in table 2, radiation shields must be
installed. See figure 6.
Use 24 gauge or heavier galvanized smoke pipe and fittings to connect the furnace to the vent. Connect flue pipe
to chimney using the least number of elbows and angles
possible. Flue pipe or vent connector must be inserted into
but not beyond the inside surface of the chimney flue. No
reduction in diameter of flue pipe is acceptable. It is best to
Page 9
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