INSTALLATION
,t_2005 Lennox industries Inc,
Dallas, Texas, USA
RETAIN THESE INSTRUCTIONS
FOR FUTURE REFERENCE
A IMPORTANT
INSTRUCTIONS
O23V Series Units
OIL UNITS _ Technical
505,082M LL.L[ Publications
10/05 Litho U.S.A.
General ...................................... 1
Shipping & Packing List ........................ 1
O23V Unit Dimensions ......................... 2
O23V Unit Parts Arrangement ................... 3
O23V Oil BurnerPartsArrangement ................ 3
Requirements ................................. 4
Locate & Level the Unit ........................ 4
Unit Adjustments .............................. 5
Venting ...................................... 5
Flue Connections .............................. 10
Supply & Return Air Plenums ................... 10
Oil Supply Lines Sizing ......................... 10
Oil Supply Line & Filter Connections ............. 12
Leak Check ................................... 12
Electrical ..................................... 12
Blower Control ................................ 13
Unit Start-Up & Adjustments .................... 17
Service ...................................... 18
Heating Events Actions & Responses ............ 18
Troubleshooting ............................... 19
Oil Furnace Start-Up & Check List ............... 24
O23V SERIES UNITS ARE NOT FOR USE IN
ZONING APPLICATIONS!
These instructions are intended as a general guide and do
not supersede local codes in any way. Only qualified tech-
nicians can install and service the Dave Lennox Signa-
ture'" Collection O23V oil furnaces. In Canada, refer to
CSA B139 for recommended installation procedures. Con-
sult authorities who have jurisdiction before installation.
1 - Assembled oil furnace
1 - Barometric draft control
1 - Side exhaust pipe collar
1 - Direct intake collar (AFII burner units only)
Check the components for shipping damage. If you find
any damage, immediately contact the last carrier.
a WARNING
a WARNING
10/05
NIIIIIIIIIIIIIIIIIIIIIIllllIlllIlll
Page 1
505,082M
NIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII
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)
3/4 (19)
1-1/2 (38)--IP,
4
_" B
D-------_ c==_
C SUPPLY O
OPENING _
AIR czz_
TOP VIEW
' I
22-.4
I 14 (559) I
I (356) I
I I
I___t ..... /
CZ222ZD
,J
TOP FLUE OUTLET
J
CONNECTION
Exchanger)
J
,91_1-1/2
(38)
t
23-1/2
(597)
FLUE
(On Heat
T
54
(1372)
_ r
,_----- A -----_
\
It
AIR FLOW
1-1/4 (32)--Ip
_ 2151t___22
(559)
RETURN AIR SIDE VIEW
Figure 1
,_I_E
RETURN AIR FRONT VIEW
_, WARNING
iii_i_i_i_i_:_i_i_i_i_bi_i_i:_i_!_i!_i_i_i_i_ji_i!_i_i_iii_I_ii_i_i_i_i_i_i_i_i_i_i_i_i_i_i_i_i_i_i_i_i_i_i_i_i_i_i_i_i_i_i_i_i_i_i_i_i_!_!_!:
O23V Model A B C D E
-Q2/3-70/90
&-
Q3/4-105/120 (495) (778) (457) (498) (406)
-Q5-140/154
19-1/2 30-5/8 18 19-5/8 16
22-1/2 33-1/8 21 22-1/8 18
(572) (841) (533) (562) (457)
CAUTION
505082M 10/05
Page 2
CLEAN-OUT PORT
HEATEXCHANGER
FLUE OPENING
LIMIT SWITCH
CONTROL BOX WITH
FAN CONTROL BOARD
BECKETT@
AFIIBURNER
CLEAN-OUT PORT
OBSERVATION PORT
COMBUSTION AIR INTAKE
VARIABLE SPEED
BLOWER MOTOR
CAPACITOR
Figure 2
FLANGE GASKET IGNITION REAR ACCESS CONTROL BOX ADJUST
AIR TUBE REAR ACCESS \
ASSY FOR FLANGE DOOR ASSY
RETAIN- FB-HEADS X
ING CLIP ESCUTCHEON
SCREW
CONNECTOR TUBE ELECTRONIC PRIMARY 4X4 AIR
AIR TUBE TRANSFORMER DOOR GASKET IGNITOR DIAL
SCREWS
PLATE
SPLINED
NUT
MAIN
NOZZLE ADAPTER
NOZZLE LINE ELECTRODE
HEAD ASSY,
ELECTRODE ASSY FUEL
PRE-MOUNTED OIL-DELAY VALVE T- PEDESTAL COUPLING
Figure 3
Page 3
ASSY
PUMP
MOTOR BLOWER INLETAIR
WHEEL SCOOP
O23V SERIES
A CAUTION
A CAUTION
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 Equip-
ment, the Canadian Electrical Code Part1, CSA 22.1
(Canada), the recommendations of the National Envi-
ronmental Systems Contractors Association and any
state or provincial laws or local ordinances. Authorities
having jurisdiction should be consulted before installa-
tion. 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
O23V units in confined spaces such as utility rooms,
two combustion air openings are required. Dimen-
sions 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.
Table 1
Combustion Air Opening Dimensions
Model No.
O23V-70/90/105/120
O23V-140/154
(2 openings required)
10" X 20" (254 mm X 508 mm)
11" X 22" (279 mm X 559 mm)
The combustion air opening should provide a mini-
mum 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.
Table 2
O23V 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)
With the HEAT selector pin in the position shown in the
wiring diagram (on page 16), the unit must operate at
a temperature rise in the range listed in table 7 (on
page 17).
• When installed, furnace must be electrically grounded
in accordance with local codes or, in the absence of lo-
cal 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 connections with the unit must meet or ex-
ceed specifications of type T wire and must 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 up-
stream 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 d air) shall
be adequate to prevent chilled air from entering the fur-
nace 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.
Xk WARNING
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 acces-
sibility clearances take precedence over fire protec-
tion clearances.
A IMPORTANT
505082M 10_5
Set the unit in desired location keeping in mind the clear-
ances listed in table 2. Also keep in mind oil supply connec-
tions, electrical supply, flue connections and sufficient clear-
ance for installing and servicing unit.
Level the unit from side to side and from front to rear. If the
furnace is not level, place fireproof wedges or shims be-
tween 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 ifweight of furnace is not evenly
distributed.
Page 4
Neitherthenozzlesettingnortheairadjustmentsarefac-
toryset.Thefurnaceisfiretestedandthelimitcontrolis
checkedtomakesureitfunctionsproperly;nofactoryset-
tingsaremade.Duringinstallation,thefurnacemustbe
"setup."Theinstallingdealer/contractormusthaveand
usepropertestequipmentinordertocorrectlysetupthe
oilfurnace.Propertestingequipmentisrequiredtoensure
correctoperationoftheunit.Theuseoftestequipmentis
nowmorecriticalthaneverduetotightertolerancesneed-
edtokeepthefurnaceoperatingefficiently.
Amongthetestequipmentforanoilfurnace,theproper
combustiontestkitshouldcontainthefollowing:
• Draftgauge
• CO 2 or 0 2 analyzer
• Smoke tester
• Pressure gauge
• High temperature thermometer
• Beckett T-500 gauge
• Oil vacuum gauge
• Knowledge of proper test equipment operation
O23V Series Burner Removal
Loosen three nuts which at-
tach burner to vest panel.
To correctly adjust the nozzle, use a Beckett #T-500 gauge
Insert the small end of the gauge into the end of the cone
and measure from the flat of the end cone to the tip of the
nozzle. When nozzle depth is correct, the tip of the nozzle
should just touch the end of the gauge. Refer to the illustra-
tion sheet provided with the gauge. Note that the scale side
of the gauge is not used for this purpose. Make corrections
by sliding the nozzle assembly forward or backward within
the blast tube (figure 5). At the same time, check the
nozzle alignment.
Beckett Oil Burner Nozzle Adjustment
Burner must be removed from furnace for this procedure.
GAUGE 2 1
Rotate burner counterclockwise on
slots then pull toward you,
Figure 4
CAUTION
Adjusting the Nozzle
Proper adjustment d the nozzle assembly is critical be-
cause alignment may have changed during shipping. Be-
fore the furnace and oil lines are installed, the nozzle as-
sembly must be checked. To check the nozzle assembly,
remove the entire burner assembly (not just the nozzle)
from the furnace. The lower firing nozzle is factory
installed. This should be verified by the installer. Inspect
the spark transformer leads also to ensure they are still at-
tached to the electrodes.
The burner assembly is attached to the vestibule panel by
three nuts. Slots are provided in the mounting flange for re-
moving the burner assembly from the vestibule. By loosen-
ing the nuts and by turning the whole burner assembly
counterclockwise (figure 4), the entire burner assembly
will come out of the furnace. There is adequate wire to re-
move the burner without disconnecting wires. Once re-
moved, turn the burner around in the vest panel area.
TO ADJUST NOZZLE:
1-Loosen screw.
2-Slide entire nozzle/electrode assembly back and forth until nozzle
just touches the gauge.
Figure 5
To check nozzle alignment, again insert the small end into
the end cone and measure the nozzle and electrode align-
ment against the center lines marked on the gauge (again
refer to enclosed illustration sheet). If the nozzle is not cen-
tered, but found to be too far left or right, a new nozzle as-
sembly will need to be ordered. Do not attempt to adjust by
bending the 90 degree elbow in the oil line.
A WARNING
Page 5
O23V SERIES
A, WARNING I
Wall Thimble
A WARNING
CAUTION
NOTE - Oil burning equipment may be vented into an ap-
proved masonry chimney or type L vent. (Type L vent is
similar in construction to type B gas vent. Type L vent car-
ties a higher temperature rating and is constructed with an
inner liner of stainless steel, rather than aluminum.)
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 Protec-
tion 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 re-
quired during burner operation.
1. Local building codes may have more stringent installa-
tion requirements and should be consulted before
installation of unit.
2. The vent connector should be as short as possible to
do the job.
3. The vent connector should not be smaller than the out-
let 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 Stan-
dards of the National Board of Fire Underwriters. See
figure 6.
COMBUSTIBLE VENT PIPE
WALL
Figure 6
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. See
figure 7.
Masonry Chimney
BAROMETRIC
CONTROL*
LINER
(
LOCATION)
CLEAN OUT
MASONRY
CHIMNEY
CLEAN OUT
*Barometric control may be installed in either vertical or horizontal
section of flue pipe within 18" of flue outlet of furnace.
Figure 7
10. Extend the vent pipe into the chimney so that it is flush
with the inside of the vent liner. Seal the joint between
the pipe and the liner.
11. The furnace shall be connected to a factory built chim-
ney or vent complying with a recognized standard, or
masonry or concrete chimney lined with a lining mate-
rial 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 con-
nection. Chimney must be able to sufficiently vent all
appliances operating at the same time.
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 sec-
tions. See figure 8.
505082M 10/05
Page 6
16.Wherecondensationofventgasisapparent,thevent
shouldberepairedorreplaced,Accumulationof con-
densation in the vent is unacceptable.
17. Vent connectors serving this appliance shall not be
connected into any portion of mechanical draft sys-
tems operating under positive pressure,
18. Keep the area around the vent terminal free of snow.
ice and debris,
Combustion Air Requirements
WARNING
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.
Factory-built Chimney
BAROMETRIC
CONTROL*
(IN EITHER_
LOCATION)
FACTORY
BUILT
CHIMNEY
/
\
E
DRAIN FOR
CONDENSATE
D
F _
U U LJ
*Barometric control ma_ be installed in either vertical or horizontal
section of flue pipe within 18" of flue outlet of furnace.
Figure 8
Combustion and Ventilation Air (Confined and
Unconfined Spaces)
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, ap-
pliance 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, nega-
tive pressure (pressure outside is greater than inside pres-
sure) 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,
The importance of the previous paragraph cannot be over-
stated. Users may inadvertently block fresh air intakes af-
ter installation,
In the absence of local codes concerning air for combus-
tion and ventilation, the following section outlines guide-
lines and recommends procedures for operating oil fur-
naces in a manner that ensures efficient and safe
operation. Special consideration must be given to combus-
tion air needs as well as requirements for exhaust vents
and oil piping,
CAUTION
All oil-fired appliances require air to be used for the com-
bustion process. If sufficient amounts of combustion air
are not available, the furnace or other appliance will oper-
ate in an inefficient and unsafe manner. Enough air must
be provided to meet the needs of all fuel-burning ap-
pliances, 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 con-
taining the furnace, the return air must be handled by ducts
which are sealed to the furnace casing and which termi-
nate outside the space containing the furnace. This is es-
pecially important when the furnace is mounted on a plat-
form in a confined space (e.g., 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 con-
fined space either from inside the building or from outside,
Page 7
O23V SERIES
Air from an Adjacent Space
If the confined space housing the furnace adjoins space
categorized as unconfined, air can be brought in by provid-
ing 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 9),
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
12).
Equipment In Confined Space - All Air
From Outside (Inlet Air From Crawl Space
& Outlet Air To Ventilated Attic)
CHIMNEY VENTILATION
OR OIL _ LOUVERS (Each
VENT end of attic)
Equipment In Confined Space -
All Air From Inside
CHIMNEY OR
OIL VENT
WATER
HEATER
OIL
FURNACE
OPENINGS
(To Adjacent
Room)
! ii ii ii ii ii ii ii ii i
| i
_1 I" =1 I"
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).
Figure 9
Air from Outside
If air from outside is brought in for combustion and ventila-
tion, the confined space shall be provided with two perma-
nent 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 figures 10 and 12). When communi-
cating with the outdoors through horizontal ducts, each
OIL
FURNACE
VENTILATION
LOUVERS
(For unheated
crawl space)
r 1 f "I
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 en-
closure.
OUTLET
AIR
WATER
HEATER
INLET AIR
rrcrn
Figure
10
Equipment In Confined Space -All
Air From Outside (All Air Through
Ventilated Attic)
CHIMNEY
OR OIL
VENT
OIL (Ends 12" above
FURNACE
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.
VENTILATION LOUVERS
(Each end of a{tic)
INLET AIR
bottom)
HEATER
Figure 11
505082M 10/05
Page 8
Equipment in Confined Space
All Air From Outside
CAUTION
OR_ _ OIL VENT
_ WATER
IIII IIIIHEATER
IIII OILFURNACE
INLET AIR
NOTE - Each air duct opening shall have a free area of at least
one square inch (6A 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.
Figure 12
When ducts are used, they shall be of the same cross-sec-
tional 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 cover-
ing is not known for calculating the size opening required, it
may be assumed that wood louvers will have 20 to 25%
free area and metal louvers and grilles will have 60 to 75%
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,
Direct Connection of Outdoor Air for Combus-
tion
The Beckett AFII burner was designed to allow for direct
air intake piping (4" [102 mm]), The maximum equivalent
length of pipe is 70 feet (21.3 m). A 90 ° elbow equals
6feet (1.8 m). The enclosed intake pipe ring may be used
to facilitate direct air intake to the burner through the right
side of the cabinet,
To convert the AFII burner from confined space to outside
combustion air, simply remove the three screws attaching
the inlet air scoop to the burner and insert 4" (102 mm) di-
rect air intake piping.
The use of a barometric relief placed in the intake pipe is
recommended when outdoor combustion air is directly
connected to the burner. This will allow confined space air
to be used as combustion air in the event that the opening
to the outdoor air becomes blocked. Using a barometric re-
lief in the intake will reduce the chance of sooting.
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 con-
nected to the common venting system. If venting system
has been installed improperly, the system must be cor-
rected as outlined in the previous section.
1. Seal any unused openings in the common venting sys-
tem.
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 ap-
pliances remaining connected to the common venting
system are located and other spaces of the building.
Turn on clothes dryers and any appliances not con-
nected to the common venting system. Turn on any
exhaust fans, such as range hoods and bathroom ex-
hausts, so they will operate at maximum speed. Do not
operate a summer exhaust fan. Close fireplace damp-
ers.
4. Following the lighting instruction on the unit, place the
appliance being inspected in operation. Adjust ther-
mostat 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 their previous con-
dition of use.
7. If improper venting is observed during any of the
above tests, the common venting system must be cor-
rected.
Horizontal Venting
The O23V is approved for horizontal venting with the fol-
lowing mechanical vent systems:
• Tjernlund (sideshot) #SSlC
• Field Controls #SWG-5 with the CK-61 control kit
Refer to the manufacturers' installation instructions for
installation procedures and service parts information.
Do not use the same vent with any other appliance when
using a sidewall vent system.
Maximum permissible vent length is 70 equivalent feet.
Minimum length is 15 equivalent feet. Calculate the equiv-
alent vent pipe footage from the furnace to the mechanical
vent system (Tjernlund or Field Controls) by adding the
straight vent pipe length and the equivalent elbow lengths
together.
Page 9
O23V SERIES
Locate the barometric draft control within 18 inches of the
furnace flue outlet, See figure 13 for barometric draft con-
trol location.
Horizontal Venting
BAROMETRIC
CONTROL*
Radiation Shield Installation
COMBUSTIBLE
MATERIAL "_
UNIT t
CABINET
12" (305 ram) rain
-- ING CONTROL
CC3
Q U
HORIZONTAL VENT-
*Barometric control must be
installed in the horizontal
venting system and located
within 18" of flue outlet of
furnace.
Figure 13
A IMPORTANT
Use 24 gauge or heavier galvanized smoke pipe and fit-
tings 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 outside wall of the chimney flue. No re-
duction in diameter of flue pipe is acceptable. It is best to
have flue pipe as short and direct as possible. Where two
or more appliances vent into a common flue, the area of
the common flue should be at least equal to the area of the
largest flue or vent connector, plus 50% of the area of any
additional flues or vent connectors. Install a barometric
draft control (provided) and flue pipe according to instruc-
tions packed with control,
Inspect flue pipe annually. Clean soot or ash from flue pipe,
if necessary. If pipe is rusted, replace,
Install draft control at least 12 inches beyond the furnace. If
there is no space to install the draft control in the flue pipe it
may be installed inthe vent above the flue pipe, Follow the
instructions packed with the draft control,
Alternate Side Flue Connections
The vent pipe may exit the top or sides of the cabinet, A
hole is provided in the top cap for top exit. For side exit, lo-
cate the center hole punched in the side of the cabinet, See
unit dimensions on page 2. Using it as the center point,
cut a 6 inch (152 mm) round hole in the cabinet's side.
Install the barometric draft control within 18 inches of the
furnace flue outlet,
Attach the provided finishing plate to cover rough edges.
I I
NoN_1l.
COMBUST,BLEI.,_A SEESPACERS NOTE 2 A
RADIATION SHIELDS (SEE NOTE 1)
SEE
NOTE
3
NOTE 1-Radiation shields must be constructed of 24 gauge sheet
metal minimum.
NOTE 2-Radiation shields required when A is less than 9" (229 mm).
NOTE 3-Radiation shields should extend from the top of the unit to
the top of the flue pipe.
Figure 14
Secure return air plenum to unit using sheet metal screws,
NOTE - The following are suggested procedures that should
be followed when installing the supply air plenum,
1. Use sealing strips of fiberglass.
2. In all cases, the plenum should be secured to furnace or
evaporator cabinet with sheet metal screws.
3. Install supply and return air ducts as desired.
Ensure that the restrictions of the piping system, plus any
lift involved, do not exceed the capability of the oil pump,
Use the following guidelines when determining whether to
use a single-or two-stage oil pump.
One-Pipe System
When using a one-pipe system (see figure 15), even with
the oil tank that is above the burner and a vacuum of 6"
(152 mm) Hg or less, a single-stage fuel pump with a sup-
ply line and no return line should be adequate.
Manual bleeding of the fuel pump is required on initial start
up. Failure to bleed air from the oil pump could result in an
air lock/oil starvation condition.
NOTE - As an extra precaution, cycle heating on and off
ten times after bleeding air from the oilpump. This will elim-
inate air in the gun assembly.
505082M 10/05
Page 10
Oil Piping - One-Pipe System
-- FILL PIPE
-- AIR VENT
_o_1 II TANKI v_l 8ft(2.4m)
ol II 111S"UT'OFFI "Maximam
IL VALVE I One Pipe Lift
Oil Piping -Two-Pipe System
AIR VENT
FUEL PUMP
FILL PIPE "'',_ R / AUX
-IIII RETURN m/ .FILTER
_II I PIPE _ _ INLET
--. --
(76ram'102mm) I
.... F_iF_E 14 R
outside tank fuel pump above bottom of tank.
_o Oo °°8° _o °o °o_o °o o_
Figure 15
Todetermine the correct tubing size for piping, refer to table 3
Table 3
One-Pipe Oil Sizing
Line Length Pipe Diameter (OD Tubing)
0-50' (15 m) 3/8" (10 mm)
51-100' (15 m) 1/2" (12 mm)
Two-Pipe System
When using a two-pipe system (see figure 16) with the oil
tank below the level of the burner, use a single-stage fuel
pump in lift conditions of up to 10 feet (3 m) and/or a vacu-
um of 10" (254 mm) Hg or less. Use a two-stage fuel pump
when lift exceeds 10 feet (3 m) and/or a vacuum of 10" (254
mm) Hg to 15" (381 mm) Hg. Both conditions require that
you use of a two-pipe system, which consists of a return
line that purges the fuel pump of air by returning it to the
tank. To determine the run and lift for piping, refer to table4
Use continuous lengths of heavy wall copper tubing or
steel pipe for oil supply pipe. Install oil supply pipe under
floor or near walls to protect itfrom damage, Avoid running
pipes along joists or reverberating surfaces. Always use
flare fittings. All fittings must be accessible, Do not use
compression fittings.
Figure 16
IMPORTANT
Table 4
Two-Pipe Maximum Pipe Length (H + R)
3450 RPM - 3 GPH(11.4 LPH)
Single- Two- Single- Two-
Stage Stage Stage Stage
Lift "H" 3/8" (10mm) OD 1/2" (12 mm) OD
ft (m) Tubing - ft (m) Tubing
0' (0.0) 84 (25.6) 93 (28.3) 100 (30.5) 100 (30.5)
2' (0.6) 73 (22.3) 85 (25.9) 100 (30.5) 100 (30.5)
4' (1.2) 63 (19.2) 77 (23.5) 100 (30.5) 100 (30.5)
6 ' (1.8) 52 (15.8) 69 (21.0) 100 (30.5) 100 (30.5)
8' (2.4) 42 (12.8) 60 (18.3) 100 (30.5) 100 (30.5)
10' (3.0) 31 (9.4) 52 (15.9) 100 (30.5) 100 (30.5)
12' (3.7) 21 (6.4) 44 (13.4) 83 (25.3) 100 (30.5)
14' (4.3) --- 36 (11.0) 41 (12.5) 100 (30.5)
16' (4.9) --- 27 (8.2) --- 100 (30.5)
18' (5.5) ......... 76 (23.2)
Page 11
O23V SERIES
Table 5
One-Pipe Systems
CAUTION
The burner is shipped with fuel pump set for one-pipe op-
eration. For one-pipe systems, the oil supply pipe is con-
nected to the inlet tap on the pump. A one-pipe system
should only be used where there is gravity oil flow to the
pump and the pipe is not run at any point above the oil level
in the tank.
1. Connect the inlet pipe to the pump inlet. Start the bum-
er,
2. Arrange the primary burner control for continuous op-
eration during purging (see figure 15).
3. Turn the bleed valve one turn counterclockwise to
open.
4. Bleed the unit until all air bubbles disappear.
NOTE - Hurried bleeding will prevent the unit from op-
erating properly.
5. Tighten the bleed valve securely.
Two-Pipe Systems
If the installation requires a two-pipe operation, install the
bypass plug included in the bag which is attached to the
pump. Toconvert the pump, install the bypass plug accord-
ing to the provided pump instructions. Notice in the two-
pipe system the return pipe must terminate in the tank 3"
(76 mm) to 4" (102 mm) above the supply inlet. Ensure the
return pipe terminates at the correct measurement or air
may escape into the system. This could result in loss of
prime.
NOTE- If using an outside tank in cold climates a number
one fuel or an oil treatment is strongly recommended.
1. Remove 1/4" plug from return port.
2. Insert bypass plug and tighten it (see figure 16).
3. Attach the return and inlet pipes. Start the burner. Air
bleeding is automatic.
NOTE - If a faster bleed is necessary, open the bleed
valve.
4. The return pipe must terminate 3" to 4" above the sup-
ply pipe inlet (see figure 16).
NOTE - If the return pipe does not terminate where it
should, air may enter the system, and prime may be
lost.
An oil filter is required for all models. Install filter inside
the building between the tank shut-off valve and the burn-
er. Locate filter close to burner for easy maintenance.
Table 5 lists the filters for the O23V furnace.
Installation Clearances inches (mm)
Oil Filters Cat. No.
10 micronfilter (no mounting bracket) 81 P89
10 micron replacementcartridge for filter,45 gph 53P93
Filter restriction indicator gauge 53P90
Consult burner manufacturer's instructions packaged with
unit for further details concerning oil supply pipe connec-
tions.
After oil piping is completed, carefully check all piping con-
nections (factory and field) for oil leaks,
Oil Pipe Heater (Optional)
A heater for the oil pipe is available for applications that are
located in cold climates. The heater warms the oil pipe to
assist the initial start-up.
Wiring must conform to current National Electric Code
ANSI/NFPA No, 70, or Canadian Electric Code Part I,CSA
Standard C22.1, and local building codes. Refer to figure
18 for wiring diagram and to unit nameplate for minimum
circuit ampacity and maximum overcurrent protection size,
Select the proper supply circuit conductors in accor-
dance with tables 310-16 and 310-17 in the National
Electric Code, ANSI/NFPA No, 70 or tables 1 through 4
in the Canadian Electric Code, Part I, CSA Standard
C22.1.
This unit is provided with holes for conduit, Reducer
washers are provided for sizing the hole to allow for
smaller conduit. Use provided caps to seal holes not
used. Refer to figure 17 for the terminal designations on
the A54 blower control board, Refer to figure 18 for unit
schematic wiring diagram with typical field wiring.
Separate openings are provided for 24V low voltage and
for line voltage. Refer to figure 1 for specific location.
WARNING
1. Refer to the appliance rating plate for proper fuse size.
505082M 10_5
Page 12
IMPORTANT
2, Install the room thermostat and make wire connec-
tions to the fan control board. Avoid installing thermo-
stat on an outside wall or where it can be affected by
radiant heat, Set the adjustable heat anticipator on
thermostat according to the wiring diagram sticker pro-
vided on unit,
3, Install a separate fused disconnect switch near unit so
power can be shut off for servicing,
4, Complete line voltage wiring from disconnect switch
near unit to make-up box.
NOTE - An equipment ground screw is provided. Re-
fer to unit wiring diagram and figure 18 for 023V series
units. Ground unit using a suitable ground wire.
5, Any accessory rated up to 1 amp can be connected to
the EAC terminal. (EAC terminal is energized when
the blower is operating,)
_WARNING
Blower Control Board (A54)
O23V units are equipped with a variable speed motor
which is controlled by the A54 blower control board. Blower
control board settings and operation are described in this
section,
O23V units equipped with a variable speed motor are ca-
pable of maintaining a specified CFM throughout the exter-
nal static range. A particular CFM can be obtained by posi-
tioning COOL jumpers on the blower control board. The
COOL jumper selections are labeled A, B, C and D; each
letter corresponds with an air volume (CFM) setting. The
ADJUST jumper is labeled Test, -, +, and Norm. The + and
- pin settings are used to add or subtract a percentage of
the CFM selected. The Test jumper is used to operate the
motor in the test mode. See figure 17.
Factory settings for the blower speed jumpers are given in
the wiring diagram in figure 18. Figure 17 shows the blower
control board. Use table 6 to determine the correct air vol-
ume for operation in heat and cool mode.
The CFM LED located on the blower control board flashes
one time per 100 cfm to indicate selected blower speed.
For example, if the unit is operating at 1000 CFM, CFM
LED will flash 10 times.
At times, the light may appear to flicker or glow. This takes
place when the control is communicating with the motor
between cycles. This is normal operation. Read through
the jumper settings section before adjusting the jumper to
obtain the appropriate blower speed.
To change jumper positions, gently pull the jumper off the
pins and place it on the desired set of pins. The following
section outlines the different jumper selections available
and conditions associated with each one (see figure 17).
After the CFM for each application has been determined,
the jumper settings must be adjusted to reflect those given
in table 6, From the table, determine which row most close-
ly matches the desired CFM Once a specific row has been
chosen (% NORMal, or -), CFM volumes from other rows
cannot be used, Below are descriptions of the jumper
selections.
The variable speed motor slowly ramps up to and down
from the selected air flow during both cooling and heating
demand, This minimizes noise and eliminates the initial
blast of air when the blower is initially energized,
ICM PIN (_
AH4103
ARMSTRONG PIN
45632-001
PCB635-1A
Blower Control Board (A54)
R (BOARD TO MOTOR) //
c,<=co=>:::::::: //
[.C)0,: o08
D9 -E_ °JW3°'JZC]-iRr /
w,<o)o o sso ,/
0
YI I)D12 DDZ3:g: _f'_--_
G(o)0,,0,o o I LY_J
Figure 17
Page 13
DIAGNOSTIC LED
ADJUST
/ SELECTOR PINS
/ (Setting affect cooling only)
HEATING SPEED
/ SELECTOR PINS (SEE
/ TABLE)
COOLING SPEED
/ SELECTOR PINS
j NOTE - The JW! resistor
must be cut to activate the
HUM terminal.
O23V-Q3/4-120
O23V-Q2/3-090
HEAT
..... 023V-Q2/3-070
HiO Oi
..... 023V-Q3/4-105
DI_1 O23V-Q5-140
_ O23V-Q5-154
i
HEAT SPEED SELECTOR
PINS (JUMPERS)
O23V SERIES
ADJUST
The ADJUST pins allow the motor to run at normal speed,
approximately 15% higher than normal speed, or 15% low-
er than normal speed. Table 6 gives three rows--NORM,
(+), and (-) with their respective CFM volumes. Notice that
the normal <'NORM" adjustment setting for cool speed
position C in table 6 is 800 CFM The "(+)" adjustment set-
ting for that position is 920 CFM (115% of 800 CFM) and
the "(-)" adjustment setting is 680 CFM (85% of 800 CFM).
After the adjustment setting has been determined, choose
the remaining speed settings from those offered in the
table in that row.
The TEST pin is available to bypass the blower control and
run the motor at approximately 70% to make sure that the
motor is operational. This is used mainly in troubleshoot-
ing. The G terminal must be energized for the motor to run.
COOL (single-stage systems)
The COOL jumper is used to determine the CFM during
cooling operation. This jumper selection is activated for
cooling when Y1 is energized. Y1 and Y2 must be jump-
ered for single stage cooling.
The blower motor runs at 82% CFM for the first 7-1/2 min-
utes of each cooling demand to allow for greater humidity
removal and to conserve energy. If, after 7-1/2 minutes,
the Y demand is not met, 100% CFM is supplied until the
demand is satisfied.
Y
7.Sminutes ] 100% I 50
/
i
CALL
Y - Cool Demand Present
- Cool Demand Satisfied
When the demand for cool is met, the blower ramps down
to 82% CFM for 60 seconds, then turns off.
COOL (two-stage systems)
so(
OFF
Y1 7N/2 YI/Y2 y2/Y1 yl
y57°/° minutes 1_i_-i°60 \y° 100°/° (_t_ I7_o 60
i sec \ i
CALL yl OFF OFF
Y1 - 1st-stage COOL Demand Present
yl - 1st-stage COOL Demand Satisfied
Y2 - 2nd-stage COOL Demand Present
y2 -2nd-stage COOL Demand Satisfied
If first-stage cooling does not satisfy the demand, the ther-
mostat calls for 2nd-stage cooling, closing the R to Y2 cir-
cuit on the A54 blower control board. The blower motor
ramps up to 100% CFM
When the Y2 demand is met, the blower ramps down to Y1
at 70% CFM until Y1 is met, and ramps down to 57% CFM
for 1 minute, then turns off.
HEAT
The unit is factory-set to run at the middle of heating rise
range as shown on the unit rating plate. The jumper on the
tap marked HEAT should remain in the position (A, B, D, or
D) as shown in the HEATING SPEED SELECTOR PINS
graphic found in the wiring diagram (figure 18).
The HEAT jumper is used to determine CFM during gas
heat operation only. These jumper selections are activated
only when W1 is energized.
During the heat ON delay, the blower runs at 13% CFM for
the first minute, 50% CFM for the second minute, and full
CFM after two minutes.
W
sec sec
100% _ _ 210 seconds
w
82%
\
60 61_
CALL OFF
W - Heat Demand Present
- Heat Demand Satisfied
\
IMPORTANT
A thermostat call for first-stage cooling closes the R to Y1
circuit on the A54 blower control board. The blower motor
runs at 57% CFM for the first 7-1/2 minutes of the 1st-stage
cooling demand. After 7-1/2 minutes, the blower motor
runs at 70% CFM until the first-stage demand is satisfied.
505082M 10/05
When the demand for heat is met, the blower ramps down
to 82% CFM for 3-1/2 minutes, then turns off.
Heat Pump
IMPORTANT
In heat pump mode, a call for heat pump operation follows
the same sequence as a call for cooling, with the exception
that there is a 30-second blower ramp-up to blower CFM
Page 14
Continuous Fan
When the thermostat is set for "Continuous Fan" operation
and there is no demand for heating or cooling, the blower
control will provide 50% of the COOL CFM selected.
G
l 50% &_ /
CALL g - Fan switch OFF OFF
NOTE - With the proper thermostat and subbase, continu-
ous blower operation is possible by closing the R to G cir-
cuit.
Dehumidification
The A54 blower control board (see figure 17) includes a
Blower Performance {0 through 0.80 in. w.g. (0 through 200 Pa) Extemal Static Pressure Range}
"ADJUST"
Jumper
Setting
ADJUST
"HEAT" Jumper Speed Position [kBtuh heat input]
iiiiii'",_!_;!ji!i!!i_!i_!i!_!i_ii_ii_ii_iii_iiiiiiiiii
G - Fan switch ON
HEAT
B B
HEAT HEAT
HUM terminal which provides for connection of a humidis-
tat. The JW1 jumper on the blower control board must be
cut to activate the HUM terminal. The humidistat must be
wired to open on humidity rise. When the dehumidification
circuit is used, the variable speed motor will reduce the se-
lected air flow rate by 18% when humidity levels are high.
An LED (D1) lights when the blower is operating in the de-
humidification mode.
Humidification
Terminals are provided on the A15 control board for 120
volt output to operate a humidifier. The "HUM" terminal is
energized when there is a call for heat. See figure 18.
Electronic Air Cleaner
Terminals are provided on A15 control board for 120 volt
output to an electronic air cleaner. The "EAC" terminal is
energized when there is a call for heat, cool, or continuous
blower. See figure 18.
Table 6
"COOL" Jumper Speed Position
iA ^
D h
COOL COOL COOL
B C
(+)
NORM
(-)
(+)
NORM
(-)
(+)
NORM
(-)
cfm L/s
cfm L/s
cfm L/s cfm L/s
Model O23V2/3-70/90 Units
[-90] [-70]
;_/A_!A
Same as NORM 1380 650 1150
1000 470 750 355 1200 565 1000
Same as NORM 1020 480 850
Model O23V3/4-105/120 Units
[-120] [-105]
SameasNORM 1610 760 1380
1300 615 1200 565 1400 660 1200
SameasNORM 1190 560 1020
Model O23V5-140/154 Units
[-154]
Same as
NORM
1730 816
..............................................................NORM
Same as
!A: Same as
..........................................................NORM
[-140]
Sameas
NORM
2300 1085 2070
1400 660 2000 945 1800
1700 800 1530
NOTE - Continuous Fan air volume is 50% of COOL speed.
cfm L/s cfm L/s
545
920 435
47O
800 380
4OO
680 320
65O
1150 540
565
1000 470
48O
850 400
1840 870
975
1600 755
85O
1360 640
72O
cfm
69O
6OO
510
92O
8OO
68O
1380
1200
1020
L/s
325
285
24O
435
380
320
65O
565
48O
Page 15
O23V SERIES
THERMOSTAT
$2, _ ?
" I _ ' L J
LLL: -
023V Wiring Diagram
TI
TRANGFORMER
FACTORY*IRINE co&_____.NsiNG
LINE VOLTAGE
- -- - LOW VOLTAGE FIELD WIRING
/X
A
/3_ THERIdOSTAT HEAT JUMPER
-- IS USED,PURPLE IS WIRE COLOR _ 025V-02/3-090
/J_ THE JWl J_ER MUST BE CUT
/_k IF TWO STAGE COOLING IS USED.
/'_ 1F HEAT PUMP 15 USED, HEMOVE
Z_ CONRECTIORS FOR 2 STAGE JUMPER _ 023V-05-154
DENOTES OPTIONAL COMPONENTS
1F ANY WIRE IN THIS APPLIANCE IS REPLACED,
IT MUST BE REPLACED WITH LIKE SIZE,RATINE
AND INSULATION THICKNESS.
IF H(_RIZONTAL APPLICATIUN
DESI GNAT I ON. 023V-03/4- I ZO
ANTICIPATOR SETTING--O. lAMP
TO ACTIVATE THE HUM TERMINAL. _ 025V-Q2/3-070
REMOVE JUMPER BETWEEN VI & Y2. J_R
JUMPER BETWEEN R AND O.
CONDENSING UNIT.
NOTES
DO NOT USE 023V FOR ZONING
REATINO SPEED SELECTOR
GESV-03/4-105
O25V-OR- 140
Figure 18
505082M 10/05
Page 16
Beforestartingunit,makesuretheoiltankisadequately
filledwithcleanNo,1orNo,2furnaceoil,
NOTE - Water, rust or other contaminants in oil supply sys-
tem will cause malfunction and failure of the internal parts
of the fuel pump.
CAUTION
1, Set thermostat for heating demand and turn on electri-
cal supply to unit,
2, Check initial air adjustment, All units are equipped with
an air adjustment dial on the right side of the burner,
See burner parts arrangement illustration.
3, Turn unit on. Place a can or container under the bleed
port located on the fuel pump. Loosen nut on bleed
port to release air and oil mixture from fuel line. Allow
mixture to escape until a steady stream of oil is emitted
from the port. Drain at least 1/2 pint of oil from the
pump, Retighten the nut on bleed port. If lockout oc-
curs, press reset button and continue with bleed pro-
cedure,
NOTE - A two-pipe fuel system will normally bleed it-
self by forcing air back to the tank through the return
line. This type of bleeding procedure is not necessary.
4, If burner fails to start, push reset button on primary
safety control and the burner motor reset button. See
part arrangement illustration,
CAUTION
5, If the burner fails to light again, refer to the trouble-
shooting section in this manual,
Measuring Fuel Pump Pressure
Measure fuel pump pressure with unit off. Attach pressure
gauge to pump outlet, Turn unit on and check pressure and
compare to table 7. Adjust if necessary,
Measuring Temperature Rise
To measure temperature rise, place plenum thermometers
in warm air and return air plenums, Locate thermometer in
warm air plenum where thermometer will not "see" the heat
exchanger to prevent it from picking up radiant heat. Set
thermostat to its highest setting to start unit, After plenum
thermometers have reached their highest and steadiest
readings, subtract the readings, The difference in temper-
atures in the supply and return air plenums should approxi-
mate the temperature rise range listed in table 7 and the
appliance rating plate, If the rise is above the range shown
in the table, check for high static pressure.
Table 7
Nozzle Size, Input Output Temp
O23V Spray Angle, Pump Rating Rating Rise
Unit & Pattern PSIG BTU/Hr BTU/Hr Head F°
-70 .50GPH-80 ° A 100 70,000 57,000 FB0 60-70
-90 .65GPH-80 ° B 100 90,000 72,000 FB0 60-70
-105 .65GPH-80 ° B 140 105,000 84,000 FB3 65-75
-120 .75GPH-80 ° B 140 119,000 105,000 FB3 70-80
-140 .85GPH-80 ° B 140 140,000 112,000 FB6 65-75
-154 1.0GPH-80 ° B 140 154,000 125,000 FB6 70-80
Adjusting Limit Control
DO NOT adjust limit control - it is preset at the factory,
Adjusting and Testing Burner
The following instructions are essential to the proper op-
eration of O23V series oil furnaces, To prevent sooting,
these instructions must be followed in sequence:
1, Draft--This test should be taken at the breach be-
tween the outlet of the vent connector and the baro-
metric draft control. Generally a 1/4" hole will need to
be drilled for the draft gauge to be inserted into the vent
connector.
A minimum of 0,03 draft must be established without
the burner in operation. With the burner in operation,
the draft should be 0,04 to 0.05. This is VERY critical to
the flame retention head burners.
Oil furnace installations also require careful inspection
to make sure the chimney is in good shape and can ac-
commodate the products of combustion, The temper-
ature in the unconditioned space will also affect the
draft if long vent connectors are allowed to get too
cold,
2. Overfire Draft--This test should be taken with the
burner in operation. Remove the screw from the center
of the inspection port, Insert your draft gauge into the
hole.
A reading of the overfire draft should be 0.02 less than
the reading found in the vent connector. If a positive
reading is seen at this point, the combustion fan is
pumping too much air into the heat exchanger. Make
the necessary adjustments at the air adjustment dial.
3, Smoke Test--The smoke test should be taken at the
hole drilled in step 1,
Using a smoke test gun adjust the air inlet shutter so
that you will have just a trace of smoke, Somewhere
between a 0 and #1 smoke, This is the starting point,
Do not stop here.
4, CO2 Test--Again, take this sample at the vent pipe,
With the unit firing at a trace of smoke, take a sample of
the CO2, From the results of this test, a "window of op-
eration" will be determined. This window of operation
establishes some tolerance, The tolerance the install-
er builds in provides room within the set-up for those
things which might affect combustion. Those things
which might affect combustion can then do so without
Page 17
O23V SERIES
causing the unit to start sooting/smoking, Things
which might affect combustion include a nozzle going
bad, draft that changes during different climatic condi-
tions, dirty oil, dirt obstructing the air inlet, etc.
To build in a "window of operation," set up the burner to
be 2% less in CO2, For example, if you find a reading of
12% CO2, adjust the air inlet shutter to increase the air
and drop the CO2 to 10%,
5. Retest the Smoke--With a drop in the CO2 and in-
crease in the air you should see that the smoke has re-
turned to 0,
6. Retest the Overfire Draft--This test serves to con-
firm that you have not increased the air too much,
Again you do not want a positive pressure at the test
port. It should still be 0.02 less than the draft pressure
reading taken at the breach. You may need to increase
the stack draft by adjusting the barometric draft con-
trol,
7. Stack Temperature--Take a stack temperature read-
ing in the vent pipe. Subtract the room air temperature
from the stack temperature. This will give you the net
stack temperature, Use the efficiency charts provided
in most CO2 analyzers to determine furnace efficiency.
4, Remove the locking screw and cap from the observa-
tion tube and with the spiral wire brush, reach upward
toward the rear of the heat exchanger to clean out the
crossover tube,
CAUTION
5, Replace the three clean out caps and flue access el-
bow. Make sure locking screws are secure,
6, Brush out and vacuum the vent outlet area of the outer
drum and replace vent pipe.
7, Clean around the burner, blower deck and vestibule
area,
NOTE - A heat exchanger clean-out kit ABRSH380
(35K09) is available from Lennox.
Servicing the Oil Burner
The nozzle and oil filter must be checked before each heat-
ing season. Also, recheck the conditions shown in the Oil
Furnace Start-up Checklist (see page 24),
NOTE - Close the oil line shutoff valve if the burner is shut
down for an extended period of time,
CAUTION
Servicing the Air Filter
NOTE - Under no circumstances should the access panels
to the blower compartment be left off or left partially open,
Throw-Away Type Filters--Check filters monthly and re-
place when necessary to assure proper furnace operation,
Replace filters with like kind and size filters,
Reusable Type Filters--Filters should be checked
monthly and cleaned when necessary to assure proper fur-
nace operation.
Servicing the Blower
Blower motor is prelubricated and sealed for extended op-
eration. No further lubrication is required. Disconnect pow-
er to unit before cleaning blower wheel for debris,
Inspecting the Flue Pipe
The flue pipe should be inspected annually by a qualified
service technician, Remove and clean any soot or ash
found in the flue pipe. Inspect pipe for holes or rusted
areas, If replacement is necessary, replace with the same
size and type as required by code. Inspect the flue draft
control device and replace if found defective.
Cleaning the Heat Exchanger
1, Remove the vent pipe from the furnace,
2, Remove the locking screws and the caps from the
clean out tubes, Remove flue access elbow.
3. Using a long spiral wire brush, sweep down the outer
drum of the heat exchanger. Then using the hose at-
tachment, vacuum out loose debris,
1, Action: Thermostat calls for heat (W terminal is en-
ergized)
Response:
• Blower control board closes oil primary control
T-3T connections,
• After a 15-second pre-purge period, power is sent
to the burner and ignition is established. When the
burner pump reaches full speed, the solenoid
valve is energized.
• Ignition system and oil primary control start the
furnace. Oil flows as long as oil primary control
senses flame.
• Burner motor energized and heat fan on ramp tim-
ing begins. When timing is complete, the circulat-
ing fan isat heat speed and warm air is delivered to
the controlled space.
2, Action: Thermostat ends call for heat (W terminal
is de-energized)
Response:
• Oil primary control is de-energized, terminating
the burner cycle.
• Heat fan off ramp timing begins. When timing is
complete, circulating fan is de-energized.
• Blower control board returns to standby mode (oil
primary control and circulating fan are off).
• After the thermostat is satisfied, the thermostat
circuit opens. The solenoid valve is de-energized
before the pump rotation stops. Power to the burn-
er is interrupted, shutting down the burner,
3, Action: Burner fails to light
Response:
• Oil primary control locks out within lockout timing
(timing depends on oil primary control),
• Burner motor is de-energized,
505082M 10_5
Page 18
4, Action: Established flame fails
Response:
• Burner motor is de-energized and oil primary con-
trol goes into recycle mode,
• If the fan off delay is longer than the recycle timing,
the heat fan continues to run through the next trial
for ignition.
5. Action: Limit Switch Opens
Response:
• Oil primary control shut off the burner.
• Circulating fan is energized immediately at cool
speed.
• A15 control board opens oil primary control T-3T
connections,
• Circulating fan runs as long as limit stays open,
6, Action: Limit Switch Closes
Response: If there is a heat demand, A15 control
board energizes oil primary control, initiating burner
light off.
Burner failure or improper operation can result from a num-
ber of different causes. Often the cause can be pinpointed
by observing the different types of failure or by the process
of elimination. The following troubleshooting charts list
some failures, causes and a sequence of steps to isolate
the point of failure. Check the simplest and most obvious
items before progressing to other items.
Source
Thermostat
Safety
Overloads
Power
Thermostat
CAD Cell
Primary Control
Procedure
Check thermostat settings.
Check burner motor,
primary safety control, &
auxiliary limit switch.
Check furnace disconnect
switch & main disconnect.
Touch jumper wire across
thermostat terminals on
primary control. If burner
starts, then fault is in the
thermostat circuit.
Disconnect the flame
detector wires at the
primary control. If the
burner starts, fault is in the
detector circuit.
Place trouble light between
the black and white leads.
No light indicates that no
power is going to the
control.
Place trouble light between
the orange and white leads.
No light indicates faulty
control.
Causes
Thermostat in OFF or
COOL
Thermostat is set too low
Burner motor overload
tripped
Primary control tripped on
safety
Auxiliary limit switch tripped
on safety
Open switch
Blown fuse or tripped circuit
breaker
Broken or loose thermostat
wires
Loose thermostat screw
connection
Dirty thermostat contacts
Thermostat not level
Faulty thermostat
Flame detector leads are
shorted
Flame detector exposed to
light
short circuit in the flame
detector
Primary or auxiliary control
switch is open
Open circuit between
disconnect switch and limit
control
Low line voltage or power
failure
Defective internal control
circuit
Correction
Switch to HEAT.
Turn thermostat to higher temperature.
Push reset button pump motor.
Reset primary control.
Reset auxiliary limit.
Close switch.
Replace fuse or reset circuit breaker.
Repair or replace wires.
Tighten connection.
Clean contacts.
Level thermostat.
Replace thermostat.
Separate leads.
Seal off false source of light.
Replace detector.
Check adjustment. Set the maximum setting.
Jumper terminals; if burner starts, switch is faulty,
replace control.
Trace wiring and repair or replace it.
Call the power company.
Replace the control.
table continued on next page
Page 19
O23V SERIES
Source Procedure Causes Correction
Burner Blownfuse Replacethe fuse.Place the trouble light
between the black and
white leads to the burner
motor. No light indicates
that no power is getting to
the motor.
Place trouble light between
the black and white leads to
the blower motor. Light
indicates power to the
motor and burner fault.
Source Procedure Causes Correction
Oil Supply Check tank gauge or use dip stick. No oil in tank Fill tank.
Coat dip stick with litmus paste and Water in oil tank If water depth exceeds 1 inch, pump
insert into bottom of tank. or drain water.
Listen for pump whine. Tank shut-off valve closed Open valve.
Oil Filters & Oil Listen for pump whine. Oil line filter is plugged Replace filter cartridges.
Line Kinks or restriction in oil line Repair or replace oil line.
Open bleed valve or gauge port. Air leak in oil supply line Locate and correct leak.
Start the burner. No oil or milky oil Tighten all connections.
indicates loss or prime.
Oil Pump Replace pump.
Install pressure gauge on pump and
read pressure. Should not be less
than 140 psi.
Nozzle
Disconnect ignition leads. Observe
the oil spray (gun assembly must be
removed from unit). Inspect the
nozzle for plugged orifice or carbon
build-up around orifice.
Ignition
Electrodes
Ignition
Transformer
Remove gun assembly and inspect
electrodes and leads.
Connect ignition leads to the
transformer. Start burner and
observe spark. Check line voltage
to transformer primary.
Binding burner blower
wheel
Sized fuel pump
Defective burner motor
Plugged fuel pump strainer Clean strainer or replace pump.
Pump is partially or completely
frozen. No pressure and the motor
locks out on overload.
Coupling disengaged or broken - no
3ressure
Fuel pressure too low
Nozzle orifice plugged
Nozzle strainer plugged
Poor or off center spray
Fouled or shorted electrodes
Dirty electrodes and leads
Eroded electrode tips
Improper electrode gap spacing
Improper position of electrode tips
Bad buss bar connection
Cracked or chipped insulators
Cracked or burned lead insulators
Low line voltage
Burned out transformer windings.
No spark or weak spark
Turn off power and rotate the blower wheel by hand.
Ifseized, free the wheel or replace the fuel pump.
Replace the motor.
Re-engage or replace coupling.
Adjust to 100 psi.
Replace nozzle with the same size,
spray angle, and spray type.
Clean electrode leads.
Clean electrode tips and reset the
gap to 5/32 inches and correctly
position tips.
Re-tension and realign.
Replace electrode.
Replace electrode leads.
Check voltage at power source.
Correct cause of voltage drop or call
the power company.
Replace the transformer.
Properly ground the transformer
case.
table continued on next page
505082M 10_5
Page 20
Source Procedure Causes Correction
Burner Motor Low line voltageMotor does not come up to speed
and trips out on overload. Turn off
power and rotate blower wheel by
hand to check for binding or
excessive drag.
Pump or blower overloading motor Correct cause of overloading.
Faulty motor Replace motor.
Check voltage at power source.
Correct cause of voltage drop or the
call power company.
Source
Poor Fire
Flame Detector
Procedure
After burner fires,
immediately jumper across
flame detector terminals at
the primary control.
• If burner continues to
run, this may be due to
poor fire. Inspect fire.
• If fire is good, fault is in
the flame detector.
Check detector circuit.
Causes
Unbalanced fire
Too much air - -lean short fire
Too little air - - long dirty fire
Excessive draft
Too little draft or restriction
Dirty cad cell face
Faulty cad cell - exceeds 15000 hms
Loose or defective cad cell wires
Primary Control olf burner locks out on Primarycontrolcircuit defective
safety, fault is in the pri-
mary control.
Source
Thermostat
Limit Control
Procedure
Check thermostat.
Connect voltmeter between
line voltage connections to
primary control (black &
white leads). If burner
cycles due to power
interruption, it is cycling on
limit.
Causes
Heat anticipator set too low
Vibration at thermostat
Thermostat in the path of a warm air
draft
Dirty furnace air filters
Blower running too slow
Blower motor seized or burned out Replace motor.
Blower bearings seized Replace bearings and shaft.
Blower wheel dirty Clean blower wheel.
Blower wheel in backward Reverse blower wheel.
Wrong motor rotation Replace with properly rotating wheel.
Restrictions in return or supply air Correct cause of restriction.
system
Adjustable limit control set too low Reset limit to maximum stop setting.
Correction
Replace nozzle
Reduce combustion air - check
combustion.
Increase combustion air - check
combustion.
Adjust barometric damper for correct draft.
Correct draft or remove restriction.
Clean cad cell face.
Replace cad cell.
Secure connections or replace cad cell
holder and wire leads.
Replace primary control.
Correction
Correct heat anticipator setting.
Correct source of vibration.
Shield thermostat from draft or relocate.
Clean or replace filter.
Increase blower speed to maintain proper
temp. rise.
Check for high static pressure.
Check HEAT selector pin per wiring
diagram (figure 18, page 16).
table continued on next page
Page 21
O23V SERIES
Source Procedure Correction
Power Locate and secure connection.
Ifvoltage fluctuates, fault is
in the power source.
Recheck voltage at the
power source.
Causes
Loose wiring connection
Low or fluctuating line voltage Call power company.
Source
Poor Fire
Flame Detector
Oil Supply
Procedure
After burner fires,
Causes
Unbalanced fire
Correction
Replace nozzle
immediately jumper
across flame detector
Too much air - - lean short fire
Reduce combustion air - check combustion.
terminals at the primary
control.
Too little air - - long dirty fire
Increase combustion air - check combustion.
• If burner continues to
run (does not lock out
of safety), fault may be
poor fire. Inspect fire.
• If fire is good, check for
fault in flame detector
circuit.
• If burner loses flame
(does not lock out on
safety), fault is in the
Excessive draft
Too little draft or restriction
Dirty CAD cell face
Faulty CAD cell - - exceeds 15000
hms
Loose or defective cad cell wires
Pump loses prime - air slug
Pump loses prime - air leak in
supply line
Water slug in line
fuel system.
Partially plugged nozzle or nozzle
strainer
Listen for pump whine Restriction in oil line Clear restriction.
Plugged fuel pump strainer Clean strainer or replace pump.
Cold oil - outdoor tank Change to number 1 oil.
Adjust barometric damper for correct draft.
Correct draft or remove restriction.
Clean CAD cell face.
Replace CAD cell.
Secure connections or replace cad cell holder
and wire leads.
Prime pump at bleed port
Check supply line for loose connections and
tighten fittings.
Check oil tank for water (over 1 inch) pump or
drain out water.
Replace nozzle.
505082M 10_5
Page 22
Source Procedure
Thermostat Disconnect thermostat
wires at the primary
control.
• Burner turns off: ther-
mostat circuit faulty.
Primary • Burner not turning off:
control primary control faulty.
Combus-
tion
Oil Pres-
sure
Check burner
combustion for CO2,
stack temperature, and
smoke
• Low CO2 less than
10%.
• High smoke reading
more than a trace.
• High stack tempera-
ture is more than
550F net.
Inspect fire and check
oil pressure.
Too much heat
Causes
Shorted or welded thermostat contacts
Stuck thermostat bimetal
Thermostat not level
Shorted thermostat wires
Thermostat out of calibration
Thermostat in cold draft
Defective primary control
Too little heat
Too much combustion air
Air leaks into heat exchanger around
inspection door, etc.
Excessive draft
Incorrect burner head adjustment
Dirty or plugged heat exchanger
Insufficient draft
Incorrect burner head adjustment
Too little combustion air
Too little blower air
Dirty or plugged heat exchanger
Dirty blower wheel
Dirty furnace air filters
Restricted or closed registers/dampers
Partially plugged or defective nozzle
Oil pressure too low: less than 100 psi.
Correction
Repair or replace the thermostat.
Clear obstruction or replace thermostat.
Level thermostat.
Repair short or replace wires.
Replace thermostat.
Correct draft or relocate the thermostat.
Replace the defective primary control.
Reduce combustion air.
Correct cause of air leak.
Adjust barometric draft control for correct draft.
Correct burner head setting.
Clean heat exchanger.
Readjust burner.
Increase draft.
Correct burner setting.
Increase combustion air.
Check for high static pressure.
Check HEAT selector pin per wiring diagram
(figure 18, page 16).
Clean heat exchanger.
Clean blower wheel.
Clean or replace filter.
Readjust registers or dampers.
Replace nozzle.
Increase oil pressure top 100psi.
Page 23
O23V SERIES
Customer Name Street Address City State/Zip Code
Furnace Model # Serial #
New Construction
Replacement
Installation Data
Furnace Location:
A Basement- Open Enclosed*
B Utility Room - Open Enclosed*
C Closet- Open Enclosed*
D Crawl Space- Open Enclosed*
*Provisions must be made for adequate air for combustion. See
Combustion and Ventilation Air on page 7.
Chimney Data:
A Inside Outside
B Brick Masonry
C Lined Size
D Type: Class A All purpose Type: L
E Condition
Flue Pipe:
A Distance to Chimney Pitch
B Diameter
C Barometric Damper Installed
D Drill 5/16" hole in flue pipe 12" upstream of barometric
damper
E Drafting Reading:
F Adjust Barometric:
Oil Tank Data:
A Installed in Basement
B Installed Outside
C Buried/Depth
D Size Gallons
E Age
F Last cleaned on date
Oil Lines:
A Size: 3/8" 1/2" Other
B Single Pipe Two Pipe
C Distance from Tank Lift
D Filter TypelnspectChange
E Pressure Test
F All fittings checked for tightness
Thermostat
A Type: Heating Cooling
B Anticipator Set:
C Wires: New Old
Air Filter
A Filter Type: Permanent Disposable
B Installed:
C Size:
Input Rate Nozzle Used
Date of Installation
Start-Up Procedure
A Close disconnect switch
B Set thermostat to call for heat
C Bleed air from lines and pump; run for 20 seconds after bubble
disappears
D Install vacuum gauge; check pump vacuum
E Install pressure gauge; adjust pressure gauge to 140 psig, Al-
ways verify proper pump pressure to corresponding tables
with instructions supplied with unit,
F After 10 minutes operating, obtain flue temperature reading:
1st 2nd 3rd
G Obtain smoke reading:
1st 2nd 3rd
H Measure CO2::
1st 2rid 3rd
Check draft overfire: Breech
J Air shutter setting Locked
K Measure static pressure in duct system:
Supply side static pressure
Return side static pressure
Static pressure drop
L Temperature rise after steady state conditions have been
achieved: Supply side Return side
M Block off return air (limit control checkout); confirm burner shut
down within 2 to 3 minutes
Owner Record
Installed by:.
Dealer:
Address
Telephone No, ( )
License No,
Notes:
505082M 10_5
Page 24
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