ICP LBO125DABR13-B, MBO115DABR-B, LBO145DABR12-B, LBO145DABR34-B, MBOV115DABR-B Installation Instructions And Use & Care Manual

UPFLOW WARM AIR

FURNACE

Printed in Canada

Save these instructions for future reference.

Caution : Do not tamper with
the unit or its controls.
Call a qualified service
technician.

Manufactured by:

International Comfort Products

3400 Blvd Industriel Sherbrooke PQ Canada

2001/08/10

X40054 Rev. H

Models:

FLO115DABR-A
LBO125DABR13-B
LBO145DABR12-B
LBO145DABR34-B

MBO115DABR-B
MBOV115DABR-B
MBOV115DABRU-B
MBOV115DBU-C

445 02 4054 01

OLF140C12A
OLR182A16A

(Division of U.T.C. Canada)

PART 1

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INSTALLATION

SAFETY CONSIDERATIONS

INSTALLATION OF OIL FIRED HEATING UNITS
SHALL BE IN ACCORDANCE WITH THE
REGULATION OF AUTHORITIES HAVING
JURISDICTION, IN CANADA THE CSA B139 OR IN
UNITED STATES THE NFPA NO.31-1992
INSTALLATION CODE FOR OIL BURNING
EQUIPMENT.

DO NOT OPERATE FURNACE IN A CORROSIVE
ATMOSPHERE CONTAINING CHLORINE, FLUORINE
OR ANY OTHER DAMAGING CHEMICALS.

DO NOT STORE OR USE GASOLINE, OR OTHER
FLAMMABLE VAPOURS AND LIQUIDS IN THE
VICINITY OF THIS OR ANY OTHER APPLIANCE.

1) SAFETY LABELLING AND SIGNAL WORDS

1.1) Danger, Warning and Caution:

The signal words DANGER, WARNING and CAUTION are used to
identify levels of hazard seriousness. The signal word DANGER is
only used in product labels to signify an immediate hazard. The signal
words WARNING and CAUTION will be used on product labels and
throughout this manual and other manuals that may apply to the
product.

2) SAFE INSTALLATION REQUIREMENTS

WARNINGWARNING

Installation or repairs made by unqualified persons
can result in hazards to you and others. Installation
MUST conform with codes or, in the absence of
local codes, with codes of the country having
jurisdiction.

The information contained in this manual is
intended for use by a qualified service technician
familiar with safety procedures and equipped with
the proper tools and test instruments.

Failure to carefully read and follow all instructions
in this manual can result in furnace malfunction,
property damage, personal injury and/or death.

WARNINGWARNING

Fire hazard
The furnace must be installed in a level position,

never where it will slope to the front.

1.2) Signal Words:

DANGER – Immediate hazards which WILL result in death or serious

injury.
WARNING – Hazards or unsafe practices which COULD result in

death or injury.
CAUTION – Hazards or unsafe practices which COULD result in

personal injury or product or property damage.

1.3) Signal Words in Manuals:

The signal word WARNING is used throughout this manual in the
following manner:

WARNINGWARNING

The signal word CAUTION is used throughout this manual in the
following manner:

CAUTION

If the furnace were installed in that position, oil
could drain into the furnace vestibule and create a
fire hazard, instead of draining properly into the
combustion chamber.

NOTE: It is the personal responsibility and obligation of the customer

to contact a qualified installer to ensure that the installation is
adequate and conforms to governing codes and ordinances.

a. This furnace is NOT approved for installation in mobile homes,

trailers or recreation vehicles.

b. You must have a sufficient supply of fresh air for combustion and

ventilation to the area in which the furnace is located.

c. Do NOT use this furnace as a construction heater or to heat a

building that is under construction.

d. Use only the Type of fuel oil approved for this furnace (see

Rating Plate on unit). Overfiring will result in failure of heat
exchanger and cause dangerous operation.

e. Visually check all oil line joints for signs of wetness, which would

indicate a leak.
f. Connect furnace to the chimney.
g. The points in Part 2 “Operation” are vital to the proper and safe

operation of the heating system. Take the time to be sure they

are all done.
h. Follow the rules of the NFPA Pamphlet No.31 (for USA) and B-

139 (for Canada) or local codes for locating and installing the oil

storage tank.
i. Follow a regular service and maintenance schedule for efficient

and safe operation.

3

j. Before servicing, allow furnace to cool. Always shut off electricity

and fuel to furnace when servicing. This will prevent electrical

shock or burns.
k. Seal supply and return air ducts.
l. The vent system MUST be checked to determine that it is the

correct type and size.
m. Install correct filter type and size.
n. Unit MUST be installed so electrical components are protected

from direct contact with water.

2.2) Freezing Temperature and Your
Structure:

WARNINGWARNING

Freeze warning.

2.1) Safety Rules:

Your unit is built to provide many years of safe and dependable
service providing it is properly installed and maintained. However,
abuse and/or improper use can shorten the life of the unit and create
hazards for you, the owner.

a. The U.S. Consumer Product Safety Commission recommends

that users of oil-burning appliances install carbon monoxide
detectors. There can be various sources of carbon monoxide in
a building or dwelling. The sources could be gas-fired clothes
dryers, gas cooking stoves, water heaters, furnaces, gas-fired
fireplaces, wood fireplaces, and several other items. Carbon
monoxide can cause serious bodily injury and/or death.
Therefore, to help alert people of potentially dangerous carbon
monoxide levels, you should have carbon monoxide detectors
listed by a nationally recognised agency (e.g. Underwriters
Laboratories or International Approval Services) installed and
maintained in the building or dwelling (see Note).

b. There can be numerous sources of fire or smoke in a building or

dwelling. Fire or smoke can cause serious bodily injury, death,
and/or property damage. Therefore, in order to alert people of
potentially dangerous fire or smoke, you should have fire and
smoke detectors listed by Underwriters Laboratories installed
and maintained in the building or dwelling (see Note below).

NOTE: The manufacturer of your furnace does not test any detectors
and makes no representations regarding any brand or type of
detector.

Turn off water system.
If your unit remains shut off during cold weather the

water pipes could freeze and burst, resulting in
serious water damage.

Your unit is equipped with safety devices that may keep it from
operating if sensors detect abnormal conditions such as clogged
exhaust flues.

If the structure will be unattended during cold weather you should take
these precautions.

a. Turn off main water supply into the structure and drain the water

lines if possible. Open faucets in appropriate areas.

b. Have someone check the structure frequently during cold

weather to make sure it is warm enough to prevent pipes from
freezing. Suggest they call a qualified service agency, if
required.

2.3) Installation regulation:

All local and national code requirements governing the installation of
oil burning equipment, wiring and flue connections MUST be followed.
Some of the codes that may be applicable are:

CSA B139 INSTALLATION CODE FOR OIL

BURNING EQUIPMENT

CAUTION

Insure that the area around the combustion air intake
terminal is free of snow, ice and debris .

CAUTION

Do not use any commercially available soot remover.
This furnace has fiber type refractory combustion
chamber. Normal servicing of this unit does not require
cleanings of the combustion chamber. Use extreme
care if for any reason you have to work in the area of
the combustion chamber.

4

ANSI/NFPA 31 INSTALLATION OF OIL BURNING

EQUIPMENT

ANSI/NFPA 90B WARM AIR HEATING AND AIR

CONDITIONING SYSTEMS
ANSI/NFPA 70 NATIONAL ELECTRICAL CODE
CSA C22.2 No3 CANADIAN ELECTRICAL CODE
Only the latest issues of the above codes should be used.

3) LOCATING THE FURNACE

CAUTION

Check carefully your furnace upon delivery for any
evidence of damage that may have occurred during
shipping and handling. Any claims for damages or lost
parts must be made with the Transport Company.

This furnace is approved for reduced clearances to combustible
construction, therefore, it may be installed in a closet or similar
enclosure and in any case, the unit should always be installed level.

In a basement, or when installed on the floor (as in a crawlspace), it is
recommended that the unit be installed on a concrete pad that is 1” to
2” thick.

The required minimum clearances for this furnace are specified
in table #1.

WARNINGWARNING

The furnace should be located as close as possible to the chimney to
keep vent connections short and direct. The furnace should also be
located as near as possible to the center of the air distribution system.

Electrical shock hazard.
This furnace is not watertight and is not designed

for outdoor installation. This furnace shall be

CAUTION

Do NOT operate furnace in a corrosive atmosphere

installed in such a manner as to protect the
electrical components from water.

containing chlorine, fluorine or any other damaging
chemicals. Refer to Part 1, section 5.2.

Outdoor installation would lead to a hazardous
electrical condition and to premature furnace
failure, property damage, bodily injury or death.

Minimum clearances – combustion materials (in)

LOCATION APPLICATION In

Sides

Back Furnace 18”

Top

Bottom Furnace (combustible floor) 0”

Flue pipe

Front From burner 24”

Furnace 1”
Supply plenum within 6 ft of furnace 1”

Furnace or plenum 1”
Horizontal warm air duct within 6 ft of furnace 1”

Horizontally or below flue pipe 9”
Vertically above flue pipe 9”

4) VENTING

TABLE #1

the chimney connector with the barometric damper shut, after 5
minutes of operation) shall comply with the table #2.

WARNINGWARNING

Poison carbon monoxide gas, fire and explosion
hazard.

Read and follow all instructions in this section.
Failure to properly vent this furnace can result in

property damage, personal injury and/or death.

CAUTION

When the furnace (chimney installation) is co-vented
with other combustion appliances such as a water
heater, the allowable venting materials (i.e. L-Vent etc.)
for use with those appliances should also be
investigated.

The oil furnaces are certified for use with L-vent, A-vent, tile-lined and
metal-liner-tile-lined chimneys. The appliance may be installed in a
chimney of the proper size and adequate chimney base temperature
as specified in the Installation Code. The relevant excerpt from the
code is found in this section - Use it as a guide when local or national
codes do not exist.

Flue pipe sizing:

The following table is an except from the installation code and
indicates permitted flue sizes and minimum base temperatures for
circular flues in chimney with thermal resistance less than R6 (6 ft2 •hr

•°F / Btu). Where a new appliance, burner, or chimney is installed,
chimney vent sizes and maximum flue-gas temperatures (measured at

WARNINGWARNING

Poison carbon monoxide gas hazard
Never install a hand operated damper in the vent

pipe. However, any Underwriters Laboratories
listed electrically operated automatic type vent
damper may be installed if desired. Be sure to
follow instructions provided with vent damper.
Read and follow all instructions in this section.

Failure to properly vent this furnace or other
appliances can result in property damage, personal
injury and/or death.

NOTES: Thermal resistance values for typical chimneys are as

follows:

R2 (2 ft2 •hr •°F / Btu): clay-lined masonry, A-vent
R3 (3 ft2 •hr •°F / Btu): metal liner in clay-lined

Masonry
R6 (6 ft2 •hr •°F / Btu): metal or clay-lined masonry

with R4.5 (4.5 ft2 •hr •°F / Btu)

insulation between liner and

masonry (e.g. 2 in. of

expanded mica or 1 3/8 in. of

high density glass fibreboard.)

5

Applying the Table:

The minimum size permitted shall be 4 in. inside diameter.

If a furnace with 0.60 USGPH nozzle is to be connected to a 20 ft. tall
clay-lined masonry chimney, the thermal resistance of this chimney
type is R2, which is less than R6. The actual firing rate at 156 psig is

1.25 x .60 = .75. Therefore this table shall apply as:

TABLE # 2

Total input rating of all

connected appliances

kW kBtu/h USGPH Min. Max. 11 20 28 36

21 70 0.50 3 5 300 400 535 725
27 91 0.65 3 5 275 340 430 535
31 105 0.75 4 5 260 320 380 475
36 119 0.85 4 5 250 300 355 430
41 140 1.00 4 6 225 300 365 430
51 175 1.25 4 6 240 275 320 365

Flue inside diameter (in) Minimum base temperature (ºF)

5) AIR FOR COMBUSTION

WARNING WARNING

Poison carbon monoxide gas hazard.
Comply with ANSI/NFPA (in U.S.) or CSA (in

Canada) standard for the installation of Oil Burning
Equipment and applicable provision of local
building codes to provide combustion and
ventilation air.

Failure to provide adequate combustion and
ventilation air can result in personal injury and/or
death.

The maximum size permitted shall be 5 in. inside diameter.
The minimum base temperature shall be about 320ºF.

for chimney height (ft) of :

evaluated carefully as it may be necessary to provide outside air for
combustion.

a. Commercial building.
b. Building with indoor pools.
c. Furnaces installed near chemical storage areas.

Exposure to these substances:
a. Permanent wave solutions for hair.

b. Chlorinated waxes and cleaners.
c. Chlorine based swimming pool chemicals.
d. Water softening chemicals.
e. De-icing salts or chemicals.
f. Carbon tetrachloride.
g. Halogen type refrigerants.
h. Cleaning solvent (such as perchloroethylene).
i. Printing inks, paint removers, varnishes, etc..
j. Hydrochloric acid.
k. Solvent cements and glues.
l. Antistatic fabric softeners for clothes dryers.
m. Masonery acid washing materials.

5.1) General:

Oil furnaces must have an adequate supply of combustion air. It is
common practice to assume that older homes have sufficient
infiltration to accommodate the combustion air requirement for the
furnace. However, home improvements such as new windows, doors,
and weather stripping have dramatically reduced the volume of air
leakage into the home.

Home air exhausters are common. Bathroom and kitchen fans, power
vented clothes dryers, and water heaters all tend to create a negative
pressure in the home. Should this occur, the chimney become less
and less effective and can easily downdraft.

5.3) Ducted outdoor combustion air:

Outdoor combustion air kit – chimney venting:

The following kit has been certified for use on the appliance. The
component kits contain an important safety feature, namely a vacuum
relief valve, or VRV. During normal operation the burner aspirates
outdoor air. If the intake terminal ever becomes partially blocked or
fully blocked from ice or snow etc., the VRV will open to allow a
proportion of air from the dwelling to enter the burner thus maintaining
proper combustion. Once the blockage is removed, the VRV will close
and the burner will draw all air from the outdoors again:

Heat recovery ventilation (HRV) systems are gaining in popularity. The
HRVs are not designed to supply combustion air. If not properly
balanced, a serious negative pressure condition could develop in the
dwelling.

5.2) Contaminated Combustion Air :

Installation in certain areas or types of structures will increase the
exposure to chemicals or Halogens which may harm the furnace.
These instances will require that only outside air for combustion.

The following areas or types of structures may contain or have
exposure to the substances listed below. The installation must be

6

CAS-2B Components (except air duct) for the Beckett AFG burner.
The kit includes the intake terminal, vacuum relief valve (VRV) and
special air boot connection with integral air adjustment means for the
AFG burner. The CAS-2B can be used with 4” galvanised air duct or
with 4” flexible aluminium air duct. It is recommended that the metallic
air ducting material should be insulated from the air intake up to 5 feet
from the burner to avoid condensation on the outside of the intake
pipe.

CAD-1 Air duct kit consists of 25 feet of insulated UL/ULC Listed
Class 1 air duct, and two 4” steel band clamps. The duct incorporates
a corrugated flexible aluminium core, surrounded by fibreglass
insulation covered with a vinyl vapour barrier.

CAUTION

The CAS-2B does not turn the furnace installation into a
direct vent system. Therefore the building structure
must provide for adequate combustion air to be
delivered at the vacuum relief valve. The burner will
need to draw combustion air from the VRV’s
surroundings if the intake ever becomes blocked.
Therefore non-direct vent installation codes must be
followed.

Comprehensive installation instructions are provided with the kit.

6) OIL TANKS AND LINES

FIGURE # 1

Check your local codes for the installation of the tank and accessories.
A manual shut-off valve and an oil filter shall follow sequence from

tank to burner. Be sure that the oil line is clean before connecting to
the burner. The oil line should be protected to eliminate any possible
damage. Installations having the fuel oil tank below the burner level
must employ a two pipe fuel supply system with an appropriate fuel
pump (more than 8’ lift use 2 stage pump and more than 16’ an
auxiliary pump).

Follow the pump instructions to determine the size of tubing you need
in relation of the lift, or the horizontal distance.

7) BURNER INSTALLATION

Mounting the burner:

a. The warm air furnace burner mounting plate has a four bolts

configuration.

b. Position the mounting gasket between the mounting flange and

the appliance burner mounting plate. Line up the holes in the
mounting flange with the studs on the appliance mounting plate
and securely bolt in place.

After the burner is mounted:

a. Remove drawer assembly or air tube combination
b. Install nozzle (see specifications)
c. Confirm electrode settings
d. Make the electrical connections
e. Complete oil line connections

CAUTION

Do not turn on the burner until you have checked the
polarity

Nozzles:

The burners are provided with the highest capacity USGPH nozzle
installed. If another size nozzle, or replacement nozzle is required, use
the nozzle spray angle, type and manufacturer recommended in Table
#3.1 to 3.5. Note that all nozzle-marked sizes are based on a pump
pressure of 100 psi.

Always select nozzle sizes by working back from the actual desired
flow rate at operating pressure, and not by the nozzle marking.

Air and turbulator settings:

Before starting the burner for the first time, adjust the air and turbulator
settings to those listed in the Table #3.1 to #3.5. Once the burner
becomes operational, final adjustment will be necessary.

Fuel supply system:

Fuel Specifications

NOTE: Use No.1 or No.2 Heating Oil (ASTM D396) or in Canada, use
No.1 or No.2 Furnace Oil.

Before starting the burner be sure the fuel tank is adequately filled with
clean oil.

IMPORTANT

When using nozzle sizes of less than .75 USGPH, the
Installation Code for oil burning equipment requires the
installation of a 10 micron (or less) filter in the fuel oil
line. ICP requires that this practice be followed in order
to keep the lifetime heat exchanger warranty intact.

Checking the polarity:

The oil burners used on the furnaces have solid state control systems
which makes them sensitive to the proper connections of the hot and
neutral power lines. The controls will be damaged if the two lines are
reversed.

a. Set your voltmeter to line voltage.
b. Place one prong on your grounded electric entry box and one

prong on the black wire.
c. Read the voltage.
d. If the voltage is zero, check the white wire. If line voltage shows.

Reverse the 115-volt leads entering the furnace junction box.

WARNING WARNING

Fire and explosion hazard.
Use only approved heating type oil in this furnace.

DO NOT USE waste oil, used motor oil, gasoline or
kerosene.

Use of these will result in death, personal injury
and/or property damage.

7

NOTE: You may notice a slight odor the first time your furnace is

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operated. This will soon disappear. It is only the oil used on the parts
during manufacturing.

8) INSTALLING ACCESSORIES

WARNING WARNING

Electrical shock hazard.

8.4) Ductwork and Filter:

Installation:

Design and install air distribution system to comply with Air
Conditioning Contractors of America manuals or other approved
methods that conform to local codes and good trade practices.

When furnace supply ducts carry air outside furnace area, seal return
air duct to furnace casing and terminate duct outside furnace space.

Install air conditioning cooling coil (evaporator) on downstream side (in
the supply air plenum) or furnace.

Turn OFF electric power at fuse box or service
panel before making any electrical connections and
ensure a proper ground connection is made before
connecting line voltage.

Failure to do so could result in property damage,
bodily injury or death.

8.1) Electronic air cleaner (E.A.C.):

Wire leads are provided to direct 115 volts @ 0.5 Amp maximum to an
electronic air cleaner (EAC). Power will be available to the E.A.C when
E.A.C switch is on or during heating speed blower operation. Wire the
electronic air cleaner as indicated in the wiring diagram (figures # 4.1,
# 4.2 and # 4.3).

8.2) Humidifier:

Terminals are provided to direct 115 volts @ 1.0 Amp maximum to the
transformer powering the humidifier. The humidifier will be energised
anytime the blower is operating on the “Heating Speed”. Wire the
115-volts power as indicated in figures # 4.1, # 4.2 and # 4.3.

8.3) Air conditioning:

An air conditioning coil may be installed on the supply airside only.
Also, notwithstanding the evaporator coil manufacturer’s instructions,
a minimum of 6 inches clearance must be allowed between the bottom
of the coil drain pan, and the top of the heat exchanger. Wire the
thermostat and condensing unit contactor as indicated in the wiring
diagram (figures # 4.1, # 4.2 and # 4.3).

If separate evaporator and blower unit is used, install good sealing
dampers for air flow control. Cold air from the evaporator coil going
through the furnace could cause condensation and shorten furnace
life.

CAUTION

Dampers (purchased locally) MUST be automatic.

WARNINGWARNING

Poison carbon monoxide gas hazard.
Do NOT draw return air from inside a closet or

utility room. Return air duct MUST be sealed to
furnace casing.

Failure to properly seal duct can result in death,
personal injury and/or property damage.

WARNINGWARNING

Poison carbon monoxide gas hazard.
Install evaporator coil on the supply side of the

furnace ducting.
Evaporator coil installed in return side ducting can

cause condensation to form inside heat exchanger
resulting in heat exchanger failure. This could
result in death, personal injury and/or property
damage.

8

PART 2

OPERATION

1) SEQUENCE OF OPERATION

1.1) Sequence of operation - Beckett AFG, Riello

40-F and Aero F-FAC:

1. Normally open contact (T-T) on primary relay closed when

thermostat calls for heat.

2. AFG and F-FAC burner: The motor starts and spark is

established. The pump pressure builds and the poppet valve

opens admitting fuel to the nozzle. Pressure builds and poppet

valve opens, allowing oil to flow through nozzle.

40F: Burner motor starts. The burner motor fan pre-purges the

combustion chamber and vent for 10 seconds, establishing the

combustion air pattern. During this time the solenoid valve

holding coil pressure will be approximately 100 psig. Solenoid

valve opens, allowing oil to flow through nozzle. At the same

time, the burner motor’s ignition coil produces spark.

3. Spark ignites oil droplets.

4. Cad cell senses flame and burner continues to fire. Ignition

transformer ceases sparking (Riello R40-F).

5. After fan-limit control heats up to the factory set point, the

circulating air blower and electronic air cleaner starts.

6. The circulating air blower and burner motor remain on until the

thermostat is satisfied (AFG). The ignition transformer continues

to spark (AFG). The solenoid valve remains open (R40-F).

7. Thermostat is satisfied.

bleed screw - the oil should flow absolutely free of white streaks or
bubbles to indicate that no air is being drawn into the suction side of
the oil piping and pump. Tighten the bleed screw and the burner will
fire. Adjust the oil pressure as indicated in Table # 3.1 to # 3.5.

2.2) Restart if Burner Should Stop:

1. Set thermostat lower than the room temperature.

2. Press the reset button on the burner primary control (relay).

3. Set thermostat higher than the room temperature.

4. If the burner motor does not start or ignition fails, turn off the
disconnect switch and CALL YOUR SERVICEMAN

CAUTION

Do not attempt to start the burner when excess oil has
accumulated, when the furnace is full of vapour, or
when the combustion chamber is very hot.

2.3) Combustion chamber curing:

Some moisture and binders remain in the ceramic combustion
chambers after fabrication. It is important to clear the chamber of
these residues before testing. If you smoke test before curing, the
instrument may become damaged. To cure the chamber, run the unit
for 3 consecutive cycles, with 3 minutes of elapsed time in between
each cycle. Each burn cycle should be 3 minutes duration. The
exhaust will have a pungent odor and produce a white cloud of steam.

8. Primary relay contacts open, solenoid valve closes (R40-F),
burner fan motor shuts down. The ignition transformer ceases
sparking (AFG).

9. The fan-limit control BI-metal cools down to the factory set point
of 90 degrees Fahrenheit, the circulating air blower and the
electronic air cleaner turns off.

2) CHECKS AND ADJUSTMENTS

2.1) General:

During initial start-up and subsequent yearly maintenance calls, the
furnace must be thoroughly tested.

IMPORTANT

The burner must be put in operation for at least 10
minutes before any test readings are taken. For new
installations, set up the burner to the settings (see table
# 3.1 to # 3.5), before firing. These are rough
adjustments but they will ensure that the burner will
start and run smoke-free in advance of the fine
adjustments being made.

Open the oil bleed port screw and start the burner. Allow the oil to
flush into a portable container for at least 10 seconds. Slowly close the

2.4) Perform the smoke / CO2 test:

1. Pierce a test hole in the smoke pipe near the furnace breech.
Insert the smoke test instrument probe into the open hole.

2. Starting with a zero smoke reading, gradually reduce the burner
air setting until just a trace (#1 on Bacharach Scale) of smoke
results.

3. Take a CO2 sample at the same test location where the smoke
sample was taken. Note the CO2 reading associated with the #1
smoke condition.

4. Adjust the burner air setting to obtain a CO2 reading 1% lower
than the reading associated with the #1 smoke.

5. This method of adjusting the CO2 will allow adequate excess air
to ensure that the burner will burn clean for the entire heating
season.

2.5) Perform the supply air temperature rise test:

1. Operate the burner for at least 10 minutes.

2. Measure the temperature of the air in the return air plenum.

3. Measure the temperature of the air in the largest trunk coming off
the supply air plenum, just “out of the line of sight” of the radiation
coming off the heat exchanger; 12” away from the plenum on the
main take-off usually satisfies this objective.

9

4. The temperature rise is calculated by subtracting the return air

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temperature from the supply air temperature.

5. If the temperature rise exceeds the temperature specified in table
# 3.1 to # 3.5, change to the next higher blower speed tap until
the temperature rise falls to at this temperature or below. If the
excessive temperature rise cannot be reduced by increasing fan
speed, investigate for ductwork restriction(s), dirty or improper air
filter, or overfiring caused by excessive pump pressure, or
inproper nozzle sizing.

2.6) Vent temperature test:

1. Place a thermometer in the test hole located in the breech pipe.

2. The vent temperature should be between 400 and 575°F. If
not, check for improper air temperature rise, pump pressure,
nozzle size, or for a badly sooted heat exchanger.

2.7) Fan limit adjustment:

FIGURE # 2

DNS-0355 Rev.B

MBO, MBOV
1 Limit “FAN OFF” 900F
2 Limit “FAN ON” 1100F
3 Limit “HI” 2000F
LBO & OLR
1 Limit “FAN OFF” 900F
2 Limit “FAN ON” 1200F
3 Limit “HI”

Model: LBO125 1900F
Model: LBO145-12 1800F
Models: LBO145-34 and OLR182 1900F

FLO & OLF
1 Limit “FAN OFF” 900F
2 Limit “FAN ON” 1100F
3 Limit “HI” 1500F

1) GENERAL

Preventive Maintenance:
“Preventive maintenance” is the best way to avoid unnecessary

expense and inconvenience. Have your heating system and
burner inspected at regular intervals by a qualified service man.

After inspection, a complete combustion test must be performed after
each annual service of the unit to maintain optimum performance and
reliability.

10

PART 3

MAINTENANCE

WARNINGWARNING

Electrical shock hazard.
Turn OFF power to furnace before any disassembly

or servicing.
Failure to do so can result in property damage,

bodily injury and/or death.

Do not tamper with the unit or controls. Call your service
technician.

Before calling for service, check the following.

a. Check oil tank gauge and check if the oil tank valve in oil is open.
b. Check fuse or circuit breaker.
c. Check if shut-off switch is “ON”.
d. Reset thermostat above room temperature.
e. If ignition does not occur turn off the disconnect switch and call

your qualified service technician.

When ordering replacement parts, specify the complete furnace
model number and serial number.

1.1) Heat exchanger cleaning:

If the pot is damaged, it must be replaced. A damaged pot could lead
to premature heat exchanger failure. Cracking of the fire pot is normal,
however, replace the pot if the cracks have propagated more than 2/3
the way through the wall thickness. The average wall thickness of the
firepot is 3/4”.

Flooding of the fire pot:

Flooding can occur when the oil primary control has been reset a
number of times in a no-heat situation. Each time oil is fired into the
pot and does not ignite, it is absorbed in the pot. Even if the burner is
removed and the pot is felt for wetness, it is difficult to assess the
degree of oil absorption by the pot.

There is only one way to properly service a flooded fire pot, and that is
to change it.

Ordinarily, it is not necessary to clean the heat exchanger or flue pipe
every year, but it is advisable to have your oil burner serviceman
check the unit before each heating season to determine whether
cleaning or replacement of parts is necessary.

If cleaning is necessary, the following steps should be perfomed:

1. Turn “OFF” all utilities upstream of the furnace.

2. Disconnect the flue pipe.

3. Remove the flue collar panel located in the rear part of the warm
air furnace.

4. Remove the radiator baffle.

5. Disconnect the oil line and remove the oil burner from the
furnace.

6. Clean the secondary tubes, and the primary cylinder with stiff
brush and vacuum cleaner.

7. Before reassemble, the heat exchanger and combustion
chamber should be inspected to determine if replacement is
required.

8. After cleaning, replace the radiator baffle, flue collar plate and oil
burner.

9. Readjust burner for proper operation.

Soot will have collected in the first sections of the heat exchangers
only if the burner was started after the combustion chamber was
flooded with fuel oil, or if the burner has been operating in a severely
fouled condition.

CAUTION

If you observe the red warning light on the burner, push
once ONLY to try and restart. If the burner will not start,
phone your authorised service agent. Do not press the
button again.

1.3) Burner drawer assembly:

Remove the drawer assembly. Clean all foreign matter from the
retention head and electrodes. If a Beckett AFG burner has been
installed, the burner will have to be removed to check the retention
head and to check for proper “Z” dimension with the Beckett “T” gauge
supplied with every burner. Check for any sign of oil boiling out of the
nozzle and caulking - the solenoid valve could be leaking (if
applicable).

1.4) Nozzle:

Replace the nozzle with the one specified in table # 3.1 to # 3.5.

1.5) Oil filter:

Tank filter:

The tank filter should be replaced as required.

Secondary filter:

The 10 micron (or less) filter cartridges should be replaced annually.

1.6) Air filters:

1.2) Refractory fire pot:

Remove the burner and check the fire pot.

IMPORTANT

Use extreme care if cleaning of the pot is required. After
firing, the pot becomes very fragile. Do not use any
commercially available soot remover. This furnace has
a fiber type refractory combustion chamber. Normal
servicing of this unit does not require cleaning of the
combustion chamber.

IMPORTANT

Do not vacuum the ceramic chambers—they are easily
damaged.

Air filters are the disposable types. The disposable filters should be
replaced on at least an annual basis. Dusty conditions, presence of
animal hair etc. may demand much more frequent filter changes. Dirty
filters will impact furnace efficiency and increase oil consumption.

1.7) Motor lubrication:

Do not lubricate the oil burner motor or the direct drive blower motor
as they are permanently lubricated.

1.8) CAS-2B combustion air kit :

If used, check the CAS-2B combustion air kit for proper operation.
Check to see that the inlet screen is not plugged. Block the air inlet
completely and ensure that a zero smoke reading results. If a zero
smoke reading is not obtained, set up the burner as indicated on table
# 3.1 to # 3.5.

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