Airease L85UF Series User manual

507148-01 Page 1 of 14Issue 1406
INSTALLATION INSTRUCTIONS
L85UF, L85BF, L85BR
Variable Speed Oil-Fired Furnaces
Save these instructions for future reference
TABLE OF CONTENTS
START-UP CHECKLIST........................................2
INSTALLATION .....................................................3
Location ....................................................3
Clearances ...............................................3
Venting......................................................4
Filters........................................................7
Variable Speed Features ..........................8
START-UP ...........................................................10
OPERATION........................................................11
MAINTENANCE AND SERVICE .........................13
WIRING DIAGRAM .............................................14
Manufactured By
Allied Air Enterprises LLC
A Lennox International Inc. Company
215 Metropolitan Drive
West Columbia, SC 29170
Improper installation, adjustment, alteration, service, or maintenance can cause injury or property damage.
Refer to this manual. For assistance or additional information, consult a qualied installer or service agency.
WARNING
Do not store combustible materials, including gasoline
and other ammable vapors and liquids, near the furnace,
vent pipe, or warm air ducts. The homeowner should be
cautioned that the furnace area must not be used as a
broom closet or for any other storage purposes. Such uses
may result in actions that could cause property damage,
personal injury, or death.
WARNING
Never burn garbage or paper in the heating system
and never leave rags, paper, or any ammable items
around the unit.
CAUTION
This furnace is not approved for installation in a mobile
home. Do not install this furnace in a mobile home.
Installation in a mobile home could result in actions that
could cause property damage, personal injury, or death.
WARNING
The installation of the furnace, wiring, warm air ducts, venting, etc. must conform to the requirements of 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 USA); the Installation Code for Oil Burning Equipment, CSA Standard CAN/CSA B139 (in
Canada); the Canadian Electrical Code Part 1, CSA 22.1; the Recommendations of the National Environmental Systems
Contractors Association; and any state or provincial laws or local ordinances. Local authorities having jurisdiction should
be consulted before installation is made. Such applicable regulations or requirements take precedence over the general
instructions in this manual.
CAUTION
(P) 507148-01
*p507148-01*

507148-01Page 2 of 14 Issue 1406
OIL FURNACE START-UP CHECKLIST
(Complete this page and keep for future reference)
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 Combuson and Venlaon Air on page 6.
Chimney Data:
A. Inside __________ Outside _________
B. Brick or 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 ue pipe 12” upstream of barometric
damper__________
E. Obtain drafting reading; adjust barometric _____________
Oil Tank Data:
A. Installed in basement ______________
B. Outside____________
C. Buried/Depth: _________________
D. Size: ___________ gallons
E. Age: ________________________
F. Date of last cleaning: ___________________
Oil Lines:
A. Size: 3/8” _________1/2” _______ Other________
B. Single pipe _________ Two pipe_________
C. Distance from tank __________ Lift _________
D. Filter type _____________ Inspect ______ Change _____
E. Pressure test ___________
F. Recheck all ttings for tightness____________
Thermostat
A. Type: Heating _________ Cooling ________
B. Anticipator set ________
C. Wires: New___________ Old ___________
Air Filter
A. Type: Permanent ______ Disposable ______
B. Installed _____________
C. Size: ________________
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 to 145 or 150 psig
___________________________________________
Always verify proper pump pressure to corresponding
tables with instructions supplied with unit.
F. After 10 minutes of operation, obtain ue temperature
reading: 1st_________ 2nd _________ 3rd ________
G. Obtain smoke reading:
1st_________ 2nd _________ 3rd ________
H. Measure CO2: 1st _________ 2nd ________ 3rd_______
I. Check draft overre__________ Breech _________
J. Air shutter setting _____________ Locked _________
K. Measure static pressure in duct system
Static pressure on supply side ___________
Static pressure on return side ___________
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); burner
should shut down in 2 or 3 minutes____________
Installaon Data Start-Up Procedure
Owner Record
Installed By:_______________________________________
Dealer ________________________________________
Address ________________________________________
________________________________________
________________________________________
Telephone #_______________________________________
License # _________________________________________
Customer Name ________________________________________________________________________________
Address ______________________________________________________________________________________
City __________________________________________State ________________ Zip Code __________________
Furnace Model # ____________________________________________________ Serial # ___________________
Input Rate__________________________________________________________ Nozzle Used _______________
New Construction ___________________________________________________ Replacement ______________
Date of Installation _____________________________
These checks or tests are required for all oil units.
Manufactured By
Allied Air Enterprises Inc.
A Lennox International Inc. Company
215 Metropolitan Drive
West Columbia, SC 29170

507148-01 Page 3 of 14Issue 1406
INSTALLATION
For attic installations, a booster oil pump may be required
to supply oil to the oil burner. Check state and local codes
for specic requirements.
Clearances
A minimum of 24” is recommended in front of the furnace
for servicing the burner on all models.
See Table 1 for a complete listing of the minimum clearances
required for basement type and upow installations.
Read all instructions before starting work so installation
will conform to Underwriters’ Laboratories or Canadian
Standards Association requirements. The furnace must be
level when placed on its foundation (upow, counterow, and
basement models) or in its suspended position (horizontal
models). Using a carpenter’s level, check the furnace in at
least two directions. The weight must be distributed evenly
before the duct work is attached.
These instructions must be placed on or near the
furnace in a conspicuous place.
Inspection of Shipment
This furnace is shipped in one package, completely
assembled and wired. The thermostat is shipped in a
separate carton when ordered.
Upon receipt of equipment, carefully inspect it for possible
shipping damage. If damage is found, it should be noted on
the carrier’s freight bill. Damage claims should be led with
the carrier immediately. Claims of shortages should be led
with the seller within 5 days.
Location
Locate the furnace as centrally as possible so that all warm
pipes to the various rooms are nearly the same length. This
allows each room to receive an equal and proper amount of
heat. This may vary with each particular installation.
Position the furnace so the pipe connection to the chimney
will be of minimum distance and have a minimum of ttings.
In utility rooms or similar installations, the door or access
opening should be large enough to permit replacement of
the furnace, or another appliance such as a water heater,
without disturbing any other equipment.
In any installation where damage from oil may occur,
a drain pan must be installed. The drain pan must be
large enough size to completely prevent any potential
oil damage. The drain pan piping must be sized to drain
the oil pump capacity and the piping must be routed to
drain the oil back to the oil tank.
WARNING
Minimum Clearances to Combustibles – Upow Installations
Table 1
* A passage, suitable for a large person, shall be provided between the furnace and chimney for inspection or replacement of the ue connector
when necessary. A clearance of 24” shall be allowed at the rear and on one side of the furnace for service and cleaning of the blower.
** The minimum clearance shown to the ue pipe may be reduced by using special protection permitted by local building codes and National
Fire Protection Association Standards and CSA 139.
Basement Type Units Hi - Boy (Upow)
LBF & LBR LUF
67/87 104/118 67/87 104/118
Top of Plenum and Duct Work 2” 2” 2” 2”
Plenum Sides 3” 3” 3” 3”
Furnace Sides 6”* 6”** 0” 0”
Furnace Rear 24” 24” 0” 0”
From Front Door 4” 4” 4” 4”
Flue Pipe Clearance to Combustibles** 9” 9” 6” 6”
Type of Floor Comb. Comb. Comb. Comb.
Combustion Air Openings (2 req’d) 10” x 20” 11” x 22” 10” x 20” 11” x 22”

507148-01Page 4 of 14 Issue 1406
Combustion and Ventilation Air
Adequate provisions for combustion air, ventilation of
furnace, and dilution of the gases must be made.
If the furnace is installed in a conned space and combustion
air is taken from the heated space, the supply air and
ventilating air must be through two permanent openings of
equal area. A conned space is “a space whose volume
is less than 50 cubic feet per 1000 BTU per hour of the
combined input rating of all appliances installed in that
space.” One opening must be within 12” of the ceiling and
the other within 12” of the oor. Each opening must have a
minimum free area of at least 1 square inch per 1000 BTU
per hour of total input rating of all appliances within the
space but not less than 100 square inches.
If the furnace is installed in a space within a building of tight
construction, air must be supplied from outdoors. In this
case, one opening shall be within 12” of the ceiling and the
other within 12” of the oor. If vertical combustion ducts are
run, each opening must have a free area of at least 1 square
inch per 4000 BTU per hour. If horizontal combustion ducts
are run, 1 square inch per 2000 BTU per hour of the total
input of all appliances is required.
As supplied, the furnace is designed to use air inside the
dwelling for combustion. If additional combustion air is
required, installing fresh air kit ABOOT571 allows air from
outside the dwelling to be brought in to the oil burner. This
kit brings air into the burner through air inlet ductwork run
through the furnace cabinet side panel and terminated
outside the dwelling (see Figure 5). The kit includes a
vacuum relief valve to guard against combustion problems
associated with directly connecting oil burners to the outside.
Circulating Air Supply
A return air duct system is recommended. Where there is no
complete return air duct system, a return connection should
be run full size to a location outside the conned space and
completely sealed so that no air from the conned space
can be circulated through the heating duct system.
Outdoor Make Up Air
A minimum mixed return air temperature of 60 – 65°F
must be maintained for outdoor make up air to prevent
condensation and corrosion.
Venting
Chimney
Before installing the furnace, a thorough inspection of the
chimney should be made to determine whether repairs are
necessary and that the chimney is of the proper size and
constructed in accordance with the requirements of the
National Board of Fire Underwriters or Canadian Standards
Association. The smallest dimension of the chimney should
be at least equal to the diameter of the ue pipe of the
furnace. Be sure the chimney will produce a steady draft
sufcient to remove all the products of combustion from the
furnace. A fabricated vent system the same size as the ue
outlet of the furnace may also be used. If a manufactured
vent is used, it must be listed for use with oil-red equipment.
Fresh Air Kit ABOOT571 Installation
Figure 5
IMPORTANT: No more than 10’ of vertical piping allowed without
weight support.
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
re hazard or injury.
WARNING
The barometric 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 re hazard or injury.
WARNING
This furnace is certied for use with Type “L” vent, Type
“A”, and “factory-built” chimneys. “B” vent must not be
used with oil furnaces.
WARNING
The barometric control must be removed from the vent
pipe when using a combustion air adapter. Deviation
from this practice will cause improper burner operation
and may allow ue products into the living space which
may result in personal injury or death..
WARNING
Intake
Air
Hood
Field Supplied
4Piping”
Mounts Through
Furnace Cabinet
To Vent System
Flue
Furnace
Cabinet
Furnace Boot™
NX Beckett
Burner

507148-01 Page 5 of 14Issue 1406
Vertical Venting
1. Local building codes may have more stringent
installation requirements and should be consulted
before installation of the unit.
2. The ue pipe should be as short as possible to do the job.
3. The ue pipe should not be smaller than the outlet
diameter of the ue outlet of the furnace.
4. Single wall ue pipe should not run outside or through
any unconditioned space.
5. The chimney should terminate 2’ above the highest peak
of a peaked roof, and 3’ higher than a at roof.
6. The ue pipe must not pass through a oor or ceiling.
Clearances to single wall ue pipe should be no less than
specied in the Clearances section beginning on page 3.
7. The ue pipe 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 6).
8. The ue pipe should slope upward toward the chimney
on a horizontal run of at least 1/4” per foot and should
be supported by something other than the furnace (see
Figure 7 on this page and Figure 8 on page 8).
9. Extend the ue pipe into the chimney so that it is ush
with the inside of the ue liner. Seal the joint between
the pipe and the liner.
10. The furnace shall be connected to a factory-built
chimney or vent complying with a recognized standard,
or a masonry or concrete chimney lined with a lining
material acceptable to the authority having jurisdiction.
11. When two or more appliances vent into a common ue,
the area of the common ue should not be less than the
area of the largest ue or vent connection plus 50% of
the areas of the additional vents or ue connections. The
chimney must be able to sufciently vent all appliances
operating at the same time.
12. The ue pipe shall not be connected to a chimney
ue serving a solid fuel appliance or any mechanical
draft system.
13. All unused chimney openings should be closed.
14. All vent pipe run through unconditioned areas or outside
shall be constructed of factory-built chimney sections
(see Figure 7).
15. Where condensation of ue gases is apparent, the vent
shall be constructed to prevent the condensation from
entering the ue transition box opening. Provisions shall
be made to drain off the condensate (see Figure 7).
16. Vent connectors serving this appliance shall not be
connected into any portion of a mechanical draft system
operating under positive pressure.
17. Keep the area around the vent terminal free of snow,
ice, and debris.
Wall Thimble
Figure 6
Thimble
Flue Pipe
CombustibleWall
Figure 7
Factory-Built Chimney
Rear Flue
Barometric Control
(in either location)*
Factory-Built
Chimney
Drain for
Condensate
Factory-Built
Chimney
Barometric Control
(in either location)*
Drain for
Condensate
* Barometric control may be installed in either the vertical or
horizontal section of the ue pipe within 18” of the ue outlet of
the furnace.
Front Flue

507148-01Page 6 of 14 Issue 1406
Do not common vent with any other appliance when using
the sidewall system.
Maximum permissible vent length is 100 equivalent feet, and
minimum permissible length is 15 equivalent feet. Calculate
the equivalent vent pipe footage from the furnace to the
mechanical vent system by adding the straight vent pipe
length and equivalent elbow lengths together. Each 90°
elbow is equivalent to 10’ of straight pipe; each 45° elbow
is equal to 5’ of straight pipe.
Removal of Unit from Common Venting System
When an existing furnace is removed from a common venting
system serving other appliances, the venting system is likely
to be too large to properly vent the remaining attached
appliances. The following test should be conducted with
each appliance while the other appliances connected to the
common venting system are not in operation.
1. Seal any unused openings in the common venting
system.
Horizontal Venting
The design of this furnace has been approved for horizontal
venting with the following mechanical vent systems:
Refer to the manufacturer’s installation instructions for
proper installation procedures and service parts information.
Vent systems are available through the local distributor.
Barometric draft control must be used in the horizontal
venting (sidewall) system. It must be located within 18” of
the furnace ue outlet (see Figure 9).
Manufacturer
Tjernlund (sideshot)
Field Control
Model
SS1, SSC, SS2
SWGII-5-SS
with CK61 Control Kit
Figure 8
Masonry Chimney
Rear Flue
* Barometric control may be installed in either the vertical or
horizontal section of the ue pipe within 18” of the ue outlet of
the furnace.
Cleanout
Liner
Cleanout
Cleanout
Liner
Cleanout
Barometric Control
(in either location)*
Masonry
Chimney
Masonry
Chimney
Barometric Control
(in either location)*
Front Flue
Figure 9
Barometric
Control* Control for
Horizontal
Venting
Barometric
Control*
Control for
Horizontal
Venting
Horizontal Venting
Front Flue
Rear Flue
* Barometric control must be installed in the horizontal venting
system and located within 18” of the ue outlet of the furnace.

507148-01 Page 7 of 14Issue 1406
Filters
Optional lter rack kit for Upow units:
• R37398C001 - Sized for 24 X 16 X 1/2 lter
Basement
Permanent lters are supplied with these units.To clean
the lters, shake to remove any excess dirt and/or use a
vacuum cleaner. Wash with soapy detergent water and dry.
The lters should be cleaned at least once a month, or more
frequently in unusually dusty environments.
Never leave the access panels to the blower compartment
off or partially open.
Oil Supply and Oil Filter Connection
Continuous lengths of heavy wall copper tubing or steel pipe
are recommended and should be installed under the oor
or near walls to protect from damage. Do not run lines on
oor joists or other reverberating surfaces. Always use are
ttings located in accessible places.
Install a generous capacity oil lter inside building between
the fuel shutoff valve and burner. Locate lter and valve
close to burner for easy servicing. An oil lter is required
for all models. A 10-micron lter is recommended.
Combustion Chamber
The combustion chamber is installed in the furnace at the
factory. Read the instruction plate on the front of the unit
concerning proper care of the chamber.
This combustion chamber is made of preformed ceramic ber
material. Use extreme care when installing the oil burner so
that the chamber is not damaged around the burner tube.
Electrical Wiring
All wiring must conform to the National Electrical Code, the
Canadian Electrical Code, and any local codes. Connect the
115-volt, single phase service to the unit at the junction box.
Use a separate fused branch electrical circuit containing a
properly sized fuse or circuit breaker. Run this circuit directly
from the main switch box to an electrical disconnect that is
readily accessible and located near the furnace. Follow
carefully the wiring diagram adhered to the inside of the
blower compartment door.
The electrical supply to the mechanical vent system must be
supplied from the appliance. All wiring must be appropriate
Class I wiring. Wiring must be installed in rigid metal conduit,
intermediate metal, or be otherwise suitably protected from
physical damage. Refer to the wiring diagrams supplied with
the venter kit for proper electrical connections.
2. Visually inspect the venting system for proper size and
horizontal pitch and determine there is no blockage or
restriction, leakage, corrosion, or other deciencies
which could cause an unsafe condition.
3. Insofar as is practical, close all building doors and
windows between the space in which the appliances
remaining connected to the common venting system
are located and other spaces in the building. Turn on
clothes dryers and any appliance not connected to the
common venting system. Turn on exhaust fans, such
as range hoods and bathroom exhausts, so they will
operate at maximum speed. Do not operate a summer
exhaust fan. Close replace dampers.
4. Following the lighting instructions, place the unit being
inspected in operation. Adjust the thermostat so the
appliance will operate continuously.
5. Test for spillage at the draft control relief opening after
5 minutes of main burner operation. Use the ame of
a match or candle.
6. After it has been determined that each appliance
remaining 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
condition of use.
7. If improper venting is observed during any of the above
tests, the common venting system must be corrected.
See National Fuel Gas Code, ANSI Z223.1 (latest
edition) or CAN/CGA B149.1 & .2 Installation Codes
to correct improper operation of common venting
system.
Supply and Return Air Plenum
Secure return air plenum to unit using sheet metal screws.
Follow these procedures when installing supply air plenum:
1. Use sealing strips of berglass.
2. Attach the plenum to the furnace or evaporator cabinet
with sheet metal screws.
3. Both supply and return air plenums shall be square and
at least 18” long. They should be the same dimension
as the furnace opening.
4. Install supply and return air ducts as desired.

507148-01Page 8 of 14 Issue 1406
Thermostat
Locate the thermostat on an inside wall in a room usually
occupied during the day, such as a living room or dining
room, at a height of 4-1/2’ from the oor. Avoid direct sunlight
or supply air from a register. Make sure the location is not
adjacent to appliances such as ovens or lights. Wire the
thermostat with minimum of #18 AWG thermostat wire.
Continuous Blower Operation
The comfort level of the living space can be enhanced
when using this feature by allowing continuous circulation
of air between calls for cooling or heating. The circulation
of air occurs at half the full cooling airow rate. This can
produce more even temperatures throughout the home and/
or continuous operation of IAQ accessories.
To enable the continuous blower operation, place the
fan switch on the thermostat into the ON position. A call
for fan from the thermostat closes R to G on the blower
interface board. The control waits for a 1-second thermostat
debounce delay before responding to the call for fan by
ramping the circulating blower up to 50% of the cooling
speed. When the call for continuous fan is satised, the
control immediately ramps down the circulating blower.
Humidier
Terminals are provided on the control board which provides a
120-volt output to operate a humidier. The “HUM” terminal is
energized whenever the thermostat calls for heat. Refer to
furnace wiring diagram for specic connection information.
Electronic Air Cleaner
Terminals are provided on the control board for connection
of a 120-volt electronic air cleaner. The “EAC” terminal is
energized whenever the thermostat calls for heat, cooling,
or continuous blower. Refer to the furnace wiring diagram
for specic connection information.
Variable Speed Features
This furnace is equipped with a variable speed circulation
air blower motor that will deliver a constant airow within a
wide range of external static pressures. Other features of
this variable speed motor include:
Blower Ramp Up
The variable speed motor will slowly ramp up to normal
operating speed. This minimizes sound and increases
comfort by eliminating the initial blasts of air encountered
with standard blower motors.
Blower Ramp Down
At the end of a cooling or heating cycle, the variable speed
motor will slowly ramp down. If continuous blower operation
has been selected, the variable speed motor will slowly ramp
down to 50% of the selected cooling CFM.
Passive and Active Dehumidication
For situations where humidity control is a problem, a
dehumidication feature has been built into the variable
speed motor. At the start of each cooling cycle, the variable
speed motor will run at 82% of the rated airow for 7.5
minutes. After 7.5 minutes has elapsed, the motor will
increase to 100% of the rated airow.
To achieve additional dehumidification, remove the
dehumidify jumper located at the bottom right of the blower
interface board (see Figure 11) and connect a humidity
control that opens on humidity rise to the HUM and R
terminals. The HUM terminal on the blower interface
board must be connected to the normally closed contact
of the humidity control so that the board senses an open
circuit on high humidity. In this setup, the variable speed
motor will operate at 82% of the normal cooling airow rate
whenever there is a call for dehumidication. When the
relative humidity has been brought down to an acceptable
level, the cooling blower speed will return to 100% of design.
Circulating Airow Adjustments
Cooling Mode
The units are factory set for the nominal airow for each
model. Adjustments can be made to the cooling airow by
changing the position (A, B, C, or D) of the jumper plug on the
tap marked COOL (on the blower interface board) based on
the information provided in Figure 10. To determine what CFM
the motor is delivering at any time, count the number of times
the LED labeled CFM on the blower interface board ashes.
Each ash signies 100 CFM; count the ashes and multiply
by 100 to determine the actual CFM delivered (for example:
10 ashes x 100 = 1000 CFM).
Moving the jumper plug on the tap marked ADJUST from
the NORM position to the (+) or (–) position will increase or
decrease the cooling airow (Y or O call) by 15%. Changing
the position of the ADJUST jumper plug does not affect
heating airow except if a heat pump is used in conjuction
with the oil furnace. If a heat pump is used, moving the
ADJUST jumper plug to the (+) or (–) position will increase
or decrease the airow by 15% when operating in all heat
pump modes, but will not affect heating airow when the oil
furnace is used for heating.
For single stage cooling, jumper Y1 and Y2 to obtain rated
cooling CFM. In two stage cooling conguration, Y1 will
produce 70% of rated cooling CFM and Y2 will produce
100%.
Heating Mode
The unit as shipped is factory set to run at the middle of the
heating rise range as shown on the unit rating plate. The
jumper plug on the tap marked HEAT should remain in the
position (A, B, C, or D) listed in the HEAT Setting column
found in Figure 10.

507148-01 Page 9 of 14Issue 1406
Figure 10
Adjusting Airow ADJUST*, HEAT, and COOL Taps
(on Blower Interface Board)
DEHUMIDIFY
CUT TO ENABLE
COOLHEATADJUST
NORM A
B
C
D
A
B
C
D
(+)
(–)
TEST
D1
* Placing ADJUST jumper plug in the TEST position energizes the motor to a default factory setting. This
can be used to determine if the motor is operating properly. Test pin function is enabled during any mode
of thermostat call. If no thermostat call is present, test function is disabled. The ADJUST jumper plug
must be returned to original position after testing procedure is completed. Failure to do so will result
in improper air ow.
Model Motor
HP
Heat
Set-
ting
Heat-
ing
CFM
Heating CFM @ .50 Static Cooling CFM @ .50 Static
Heat
Set-
ting
A
Heat
Set-
ting
B
Heat
Set-
ting
C
Heat
Set-
ting
D
Cool
Setting
A
Cool
Set-
ting
B
Cool
Set-
ting
C
Cool
Set-
ting
D
L885UFC67V14 1/2 D 1200 1500 1400 1300 1200 1400 1200 1000 800
L85UFC87V14 1/2 A 1500 1500 1400 1300 1200 1400 1200 1000 800
L85UFC104V20 3/4 C 1550 1850 1730 1550 1400 2000 1800 1600 1200
L85UFC118V20 3/4 A 1850 1850 1730 1550 1400 2000 1800 1600 1200
L85BFC67V14 1/2 D 1200 1550 1450 1400 1200 1400 1200 1000 800
L85BFC87V14 1/2 B 1450 1550 1450 1400 1200 1400 1200 1000 800
L85BFC104V20 1 C 1550 2000 1730 1550 1450 2000 1800 1600 1200
LBF85C118V20 1 B 1730 2000 1730 1550 1450 2000 1800 1600 1200
L85BRC67V14 1/2 D 1200 1550 1450 1400 1200 1400 1200 1000 800
L85BRC87V14 1/2 A 1550 1550 1450 1400 1200 1400 1200 1000 800
L85BRC104V20 1 D 1450 2000 1730 1550 1450 2000 1800 1600 1200
L85BRC118V20 1 B 1730 2000 1730 1550 1450 2000 1800 1600 1200

507148-01Page 10 of 14 Issue 1406
Burner Start-Up
1. Set the operating control to call for heat.
2. Open all shutoff valves in the oil supply line to burner.
3. While the ignition is on, press and release the reset
button (hold 1/2 second or less). If the control has not
locked out since its most recent complete heat cycle,
the lockout time will be extended to 4 minutes, and the
ignition will remain on for the entire heat cycle.
4. Bleed the pump until all froth and bubbles are purged. The
bleed port is located on the bottom of the fuel pump.
To bleed, attach a clear plastic hose over the vent plug.
Loosen the plug and catch the oil in an empty container.
Tighten the plug when all the air is purged. NOTE:
Bleeding might not be necessary with a two-pipe
system.
5. If prime is not established within the extended lockout time,
the control will lock out. Press the reset button to reset
control (see Step 3). NOTE: The reset button can be
held for 15 seconds for the Beckett 7505B primary
control, at any time to reset the control’s lockout
counter to zero and send the control to standby.
6. Repeat Steps 3 and 4, if necessary, until pump is fully
primed and oil is free of bubbles. Then terminate the call
for heat, and the control will resume normal operation.
START-UP
Oil Burner
Burner Specication: Factory Settings
1. Burner type: NX
2. Air tube combination: NX70LHHS
and a smoke gun. A properly adjusted burner will result in
a quiet, clean re which will prevent sooting and minimize
cleaning. Using the following procedure will provide a
margin of reserve air to accommodate variable conditions.
To adjust the burner:
1. Punch a 5/16” diameter service hole in the ue outlet.
This sampling hole should be at least two ue diameters
above the breech, or elbow at the breech, but ahead of
the barometric damper.
2. Operate burner for approximately 5 to 10 minutes.
3. Take a draft reading at the service hole in the ue outlet.
Adjust barometric draft control in the stack to achieve
an overre draft of –.01” to –.02” and a breach of –.02”
to –.04”.
4. Pull and record a smoke reading at the service hole
using an industry standard smoke tester.
5. If the burner is producing more than #1 smoke, adjust
the intake air using the zero setting locking nut and
adjustment screw. Loosen the locking nut approximately
one turn. Turn the adjustment screw clockwise to
increase air or counterclockwise to decrease air.
6. Once the desired smoke level is achieved, use a suitable
test instrument for CO2to take and record a CO2reading
at the service hole in the ue outlet.
7. Adjust the air shutter (and air band, if necessary) to
reduce CO2to the desired percentage.
8. Recheck smoke level.
Table 2
Do not start burner unless blower access door is secured
in place.
CAUTION
Do not attempt to start the burner when excess oil has
accumulated in the chamber, when the furnace is full
of vapor, or when the combustion chamber is very hot.
Such actions could result in property damage, personal
injury, or death.
WARNING
Burner Adjustment
All adjustment to this furnace and its components must
be done by a qualied service technician.
Refer to Table 2 for nozzle and pump pressure information.
The proper way to adjust an oil burner is with a CO2analyzer
Fur-
nace
Model
Burner
Head Nozzle/Angle Spray Pattern
Pump
Pres-
sure
67* 6-SLOT .50 GPH/60 DELAVAN A 150 PSI
87* 6-SLOT .65 GPH/60 DELAVAN A 150 PSI
104 6-SLOT .75 GPH/60 DELAVAN A 145 PSI
118 6-SLOT .85 GPH/60 DELAVAN A 145 PSI
Burner Information
*Denotes low re bafe installed. See oil burner
specications included with instructions

507148-01 Page 11 of 14Issue 1406
9. Recheck draft and CO2reading at the service hole in
the ue outlet.
10. Using a suitable thermometer, obtain and record the ue
gas temperature at the service hole in the ue outlet.
11. Use the CO2 reading and the ue gas temperature
reading to determine unit efciency.
12. When the proper combustion and smoke readings have
been achieved, tighten the air shutter screw(s) and air
band screws that were loosened in Step 5.
Nozzle and Electrode Alignment
Proper nozzle and electrode depth and alignment are
essential for proper burner operation.
To check and adjust the nozzle depth:
1. Insert the small end of the “T” gauge into the end of the
cone and measure from the at of the end cone to the
tip of the nozzle. The proper measurement should be
1.13”. When the depth is correct, the tip of the nozzle
should just touch the base of the “T” gauge.
2. Nozzle adjustments are made by sliding the entire
nozzle assembly forward or backward within the blast
tube.
To check nozzle alignment:
1. Insert the small end of the “T” gauge into the end of the
cone and measure the nozzle and electrode alignment
against the center lines marked on the gauge.
2. If nozzle is not centered, but found to be too far left or right,
a new nozzle will need to be ordered. Do not attempt to
adjust by bending the 90° elbow in oil line.
Sequence of Operation
Heating (see Figure 13 on page 12)
The thermostat calls for heat, activating the burner motor. 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. After the thermostat
is satised, the thermostat circuit opens. The solenoid valve
is de-energized before the pump rotation stops. Power to
the burner is interrupted, shutting down the burner.
Cooling
Unit is set up at the factory for single stage cooling. For two
stage cooling operation, the jumper wire running from Y1
to Y2 on the blower interface board must be clipped and
removed. See Figure 17 on page 14 for two stage cooling
wiring.
If the active dehumidification feature is enabled, the
circulating blower runs at 82% of the selected cooling speed
OPERATION
Figure 11
Set the NX
tip position
by aligning
the electrode
top with the
mark shown
in Figure 12.
Set the electrode
tip gap spacing
(5/32”) by adjusting
the tips to meet the
two out side marks
shown in Figure
13. Make sure the
tips are centered
about the nozzle
centerline.
Figure 12

507148-01Page 12 of 14 Issue 1406
as long as there is a call for dehumidication.
Single Stage Cooling (see Figure 14)
A call for cooling from the thermostat closes the R to Y
circuit on the blower interface board. The control waits
for a 1-second delay before energizing the circulating
blower to 82% of the selected cooling CFM (passive
dehumidication mode). After 7.5 minutes, the circulating
blower automatically ramps up to 100% of the selected
cooling airow. When the call for cooling is satised, the
Heating
Figure 13
Ww
100%
82%
3.5 min
CALL OFF
W - Heat Demand Present
- Heat Demand Satisfied
w
13%
50%
1
min
1
min
7.5 minutes
Yy
82%
100%
82%
1
min
CALL OFF
Y - Cool Demand Present
- Cool Demand Satisfied
y
Single Stage Cooling
Figure 14
circulating blower ramps back down to 82% of the selected
cooling airow for 1 minute, then shuts off.
Two Stage Cooling (see Figure 15)
A call for 1st stage cooling from the thermostat closes the
R to Y1 circuit on the blower interface board. The control
waits for a 1-second delay before energizing the circulating
blower. The blower motor runs at 57% of the selected air
ow for the rst 7.5 minutes of the 1st stage cooling demand
(passive dehumidication mode). After 7.5 minutes, the
blower motor runs at 70% of the selected cooling air ow
until 1st stage cooling demand is satised.
A call for 2nd stage cooling from the thermostat closes the
R to Y2 circuit on the blower interface board. The blower
motor ramps up to 100% of the selected cooling air ow.
When the demand for cooling is met, the blower ramps
down to Y1 until satised, then ramps down to 57% for 1
minute, then turns off.
Heat Pump
For heat pump operation, clip the jumper wire between R and
O. 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.
Continuous Fan (see Figure 16)
When the thermostat is set for continuous fan operation and
there is no demand for heating or cooling, a call for fan closes
the R to G circuit and the circulating blower motor runs at 50%
of the selected cooling CFM until switched off.
Continuous Fan
Figure 16
Gg
50%
CALL OFF
G - Fan Switch ON
- Fan Switch OFF
g
Two Stage Cooling
Figure 15
Y1
y1
57%
100%
CALL OFF
7.5
minutes 70%
Y1 - 1 Stage Cool Demand Present
st
- Demand Satisfied1 Stage Cool
st
y1
Y2 - 2 Stage Cool Demand Present
nd
- 2 Demand Satisfied
nd
Stage Cool
y2
1
min
70%
Y1 y2
/
Y1
/
Y2 y1
57%
1
min
57%
The system must not be in either the passive or active
dehumidication mode when charging a cooling system.
IMPORTANT

507148-01 Page 13 of 14Issue 1406
Heat exchanger cleanout kit #ABRSH380-3 is available for
purchase.
Emergency Replacement Motor Operation
If the variable speed motor in this furnace needs to be
replaced in an emergency situation (such as “no heat”) and
an exact replacement motor is not immediately available,
a standard PSC motor of equivalent frame size, voltage,
rotation, and horsepower can be temporarily installed until
the correct replacement motor can be obtained.
Connect the desired speed taps to the HEAT and COOL
terminals and the neutral tap to the neutral terminal on the
control board (refer to the furnace wiring diagram).
Verify that the unit is operating at the desired speed and
within the rise range as shown on the unit rating plate. The
correct replacement motor must be installed as soon
as possible to ensure continued satisfactory operation
of the furnace.
Emergency Fuel Pump Replacement
If replacement of the A2EA6520 fuel pump becomes
necessary, replace it with another Beckett CleanCut
fuel pump. In an emergency situation where the correct
replacement parts are not available, an A2VA7116 fuel
pump could be used. This option can produce a smoky
start-up and shutdown that could result in fouling of a heat
exchanger. This is only a short-term option and should
be used only until the correct parts can be obtained
and installed.
Complete National Fuel Gas Codes are available from:
1. American Gas Association
1515 Wilson Boulevard
Arlington, VA 22209
2. National Fire Protection Association, Inc.
1 Battery March Park
Quincy, MA 02269
3. American National Standards Institute, Inc.
Publications Sales Department
11 West 42nd Street
New York, NY 10036
MAINTENANCE AND SERVICE
Oil Burner
It is recommended that the nozzle and oil lter be checked
before each heating season. Also recheck the conditions
shown on the OIL FURNACE START-UP CHECKLIST
found on page 2.
Close the oil line shutoff valve if the burner is shut down
for an extended period of time.
Flue Pipe
Have the ue pipe inspected annually by a qualied service
technician. If any soot or ash has formed inside the ue
pipe, remove and clean. If the ue pipe has any holes or is
rusted out, replace with a new ue pipe of the same size.
Inspect the ue draft control device and replace if defective.
Blower
Blower motor is pre-lubricated and sealed for extended
operation. No further lubrication is required. The blower
assembly may be removed from the cabinet for cleaning
and servicing of the blower. Disconnect power to the unit
before servicing.
Heat Exchanger
To clean the heat exchanger:
1. Remove the vent pipe from the furnace.
2. Remove the locking screws and the caps from the two
cleanout tubes; remove the ue access elbow.
3. Using a long spiral wire brush, sweep down the outer
drum of the heat exchanger. Using a shop vacuum hose
attachment, vacuum out all loose debris.
4. Remove the locking screw and cap from the inspection
tube and with the spiral wire brush reach upward
toward the rear of the heat exchanger to clean out the
crossover tube; replace the locking screw and cap on
the inspection tube.
5. Do not attempt to clean the combustion chamber, as it
can be easily damaged.
6. Replace the three previously removed cleanout caps
and ue access elbow, making sure to re-install the
locking screws.
7. Brush out and vacuum the vent outlet area of the outer
drum and reattach the vent pipe.
8. Clean up around burner, blower deck, and vestibule area.

507148-01Page 14 of 14 Issue 1406
Figure 17
Wiring Diagram
P/N 48252-001