Thermo Pride OL20FA151T60 Series User manual

MO-552
ECN 5631-MA 200505
OIL FIRED FURNACE
INSTALLATION AND OPERATION MANUAL
WITH USERS INFORMATION SECTION
MODELS:
OL20FA151T60(B/R) OL20RA151T60(B/R)
c WARNING: IF THE INFORMATION IN THESE INSTRUCTIONS IS NOT FOLLOWED EXACTLY, A FIRE
OR EXPLOSION MAY RESULT CAUSING PROPERTY DAMAGE, PERSONAL INJURY, OR LOSS OF LIFE.
DO NOT STORE OR USE GASOLINE OR OTHER FLAMMABLE VAPORS AND LIQUIDS IN THE VICINITY OF
THIS OR ANY OTHER APPLIANCE.
c WARNING: IMPROPER INSTALLATION, ADJUSTMENT, ALTERATION, SERVICE, OR MAINTENANCE
CAN CAUSE INJURY OR PROPERTY DAMAGE. REFER TO THIS MANUAL. FOR ASSISTANCE OR
ADDITIONAL INFORMATION CONSULT A QUALIFIED INSTALLER, OR SERVICE AGENCY.
PLEASE READ THESE INSTRUCTIONS PRIOR TO INSTALLATION, INITIAL FIRING, AND BEFORE
PERFORMING ANY SER ICE OR MAINTENANCE. THESE INSTRUCTIONS MUST BE LEFT WITH THE
USER AND SHOULD BE RETAINED FOR FUTURE REFERENCE BY QUALIFIED SER ICE PERSONNEL.
THERMO PRODUCTS, LLC.
PO BOX 237
DENTON, NC 27239
PHONE [phone]
MADE IN USA

i
I. SAFETY SECTION
This page contains various warnings and cautions found throughout the Oil Furnace
Manual. Please read and comply with the statements below.
cWARNING: This furnace is not to be used for temporary heating of buildings or structures
under construction. See Page 1.
c CAUTION: Do not exceed 90° rotation of the flue elbow counter clockwise right from the
vertical positon. See Page 2.
cWARNING: The predetermined fan and limit locations on all of the Thermo Pride oil fired
furnaces have been tested and approved by Thermo Products, LLC. in conjunction with
Underwriters Laboratories, Inc. Any attempt to relocate these safety controls or replace these
safety controls with a control that is not approved, or is incompatible, may result in personal
injury, substantial property damage or death. See Page 9.
cWARNING: The heat exchanger must be cleaned by a qualified service person See Page 9.
cCAUTION: DO NOT ATTEMPT TO MAKE REPAIRS YOURSELF! See Page 8.
cWARNING: The area around the furnace should be kept free and clear of combustible
liquids and material, especially papers and rags. See Page 8.
cWARNING: NE ER burn garbage or refuse in your furnace. Never try to ignite oil by
tossing burning papers or other material into your furnace. See Page 8.
cWARNING: Thermo Products oil furnaces are designed to burn No. 1 or No. 2 distillate
fuel oil or B5 distillate fuel oil. NE ER USE GASOLINE OR A MIXTURE OF OIL AND
GASOLINE. See Page 9.
cCAUTION: DO NOT ATTEMPT TO START THE BURNER WHEN:
1. Excess oil has accumulated,
2. The furnace is full of vapors
3. The combustion chamber is very hot.
IF ONE OR MORE OF THESE CONDITIONS EXIST, CONTACT A QUALIFIED
SER ICE PERSON. See Page 9.

All installations and services must be performed by qualified service personnel.
ii
This page contains reproductions of the various instruction and warning labels placed on
the Thermo Pride Oil Furnaces. Please read and comply with the contents of these labels.

All installations and services must be performed by qualified service personnel.
iii

All installations and services must be performed by qualified service personnel.
iv
TABLE OF CONTENTS
SECTION BEGINNING PAGE
I. SAFETY SECTION i
II. GENERAL INSTRUCTIONS 1
A.VENTING 2
B. DUCT WORK/AIR CONDITIONING 3
C. BURNER INSTALLATION 4
D. FUEL SYSTEM INSTALLATION 6
E. WIRING 6
III. STARTING THE UNIT 7
A. INITIAL STARTUP 7
B. BURNER ADJUSTMENT 7
C. AIRFLOW AND TEMPERATURE RISE 8
VI. TROUBLESHOOTING AND SERVICE 9
A. FAN CONTROL 9
B. LIMIT POSITION AND LOCATION 9
C. BURNER TROUBLSHOOTING 9
D. HEAT EXCHANGER CLEANING INSTRUCTIONS 9
V. INSTALLER'S INSTRUCTIONS TO USER 10
VI. USERS INFORMATION SECTION 11
A. COMBUSTION AIR SUPPLY 11
B. OIL SUPPLY 11
C. INSPECTION AREAS 11
D. STARTING THE FURNACE 12
E. FILTER CLEANING AND LOCATION 12
APPENDIX – A REPLACEMENT PARTS LIST 14
APPENDIX – B WIRING DIAGRAMS 20

All installations and services must be performed by qualified service personnel.
1
II. GENERAL INSTRUCTIONS - READ BEFORE START OF INSTALLATION
1. The heating output capacity of the furnace proposed for installation should be based on a heat
loss calculation made according to the manuals provided by the Air Conditioning Contractors of
America (ACCA) or the American Society of Heating, Refrigeration and Air Conditioning
Engineers, Inc. (ASHRAE).
2. All local codes and/or regulations take precedence over the instructions in this manual and
should be followed accordingly. In the absence of local codes, installation must conform with
these instructions and regulations of the National Fire Protection Association, and to the
provisions of the National Electrical Code (ANSI/NFPA 70-1999 or latest edition).
3. The installed furnace must be level and positioned in a central location with respect to outlet
registers. It should be located near the chimney to minimize any horizontal run of flue pipe, which
may be required.
4. A furnace installed in a residential garage must be installed so the burner and ignition source are
located higher than 18 inches above the floor, unless the required combustion air is taken from the
exterior of the garage. Also, the furnace must be located or protected to avoid physical damage
by vehicles.
cWARNING: This furnace is not to be used for temporary heating of buildings or structures
under construction.
5. Listed below are definitions of "COMBUSTIBLE MATERIAL" and "NON-COMBUSTIBLE
MATERIAL."
COMBUSTIBLE MATERIAL:
Material made of or surfaced with wood, compressed paper, plant fibers, plastics, or other
material that will ignite and burn, whether flame resistant or not.
NON-COMBUSTIBLE MATERIAL:
Material that is not capable of being ignited and burned. Such materials consist entirely of, or a
combination of, steel, iron, brick, tile, concrete, slate, or glass.
MINIMUM CLEARANCES TO COMBUSTIBLE MATERIALS
MODEL NO.
FROM
SIDES OF
FURNAC
E
FRONT
TOP &
SIDES OF
PLENUM
FROM
THE
FLUE/ E
NT
REAR
OL20FA151T60
OL20RA151T60 1” 24” 1” 18” 1”
The minimum clearances listed in the preceding table are for fire protection. Clearance for
servicing the front of the furnace and the rear of the lowboy models should be at least 24 inches.

All installations and services must be performed by qualified service personnel.
2
A clearance of 24 inches is recommended for passage to all points on the furnace requiring service
access.
The OL20 furnace is to be installed on non-combustible flooring only.
NOTE: When power venting a Thermo Pride oil fired furnace an isolated combustion air kit
(PVB or Beckett boot) is to be used with the other manufacturers power venting system.
NOTE: On the front flue, lowboy it is possible to rotate the flue elbow (which is factory installed
for vertical discharge) 90° counterclockwise from the vertical position to adapt to various venting
systems. (See following page for details)
A. ENTING:
The OL series furnaces must be vented in accordance with local codes and the Standard for the
Installation of Oil-Burning Equipment, NFPA 31-2001, , or the latest editions thereof.
ROTATION OF FRONT FLUE ELBOW
On the front flue, lowboy it is possible to rotate the flue elbow (which is factory installed for
vertical discharge) 90° counterclockwise from the vertical position to adapt to various venting
systems. (See following page for details)
c CAUTION: Do not exceed 90° rotation of the flue elbow counter clockwise right from the
vertical positon.
When an installation requires that the flue exit out the left hand side casing on a front flue unit,
remove screw securing the 90 deg. elbow and rotate it 90° counterclockwise. Use Table 1 to
locate the center point for the exit of the flue. Cut hole out and extend flue through side casing.
A trim collar may be ordered from Thermo Products to hide the gap around the flue pipe. This
trim collar is not required for operation.

All installations and services must be performed by qualified service personnel.
3
TABLE 1: Suggested sizes and positions of flue pipe opening on left hand side of casing.
UNIT DIA.
HOLE
“X”
DIM.
“Y”
DIM.
FLUE DIA. GASKET
PART#
TRIM COLLAR
PART#
OL20FA151T60 7-1/2” 4-1/2” 43/1/4” 7” 300006 14132
“X” DIMENSION IS MEASURED FROM SEPARATOR PANEL.
“Y” DIMENSION IS MEASURED FROM THE BASE.
Fig 1: Recommended location for drilling hole to connect
vent pipe to the furnace through the left hand side casing.
A draft regulator is supplied with the furnace and should be installed according to the regulator
manufacturer’s recommendations. With the burner operating, use a draft gauge to adjust the
regulator to the proper setting (refer to the instructions enclosed with draft regulator to adjust to
the proper setting). When the burner air supply and draft are properly adjusted, the overfire draft
should be a negative (-).01" to (-).02" WC, as measured at the 5/16" overfire air tap (See Fig. 3).
This tap is provided in the upper burner mounting plate. To measure the flue draft, punch a small
hole in the vent connector pipe as close to the furnace as possible and always before the draft
regulator.
B. DUCT WORK/AIR CONDITIONING:
If the furnace is used in connection with summer air conditioning (cooling), the furnace should be
installed parallel with or on the upstream side of the evaporator coil to avoid condensation in the
furnace heat exchanger. If the cooling unit is installed with a parallel flow arrangement, dampers
or other means used to control flow of air should be provided to prevent chilled air from entering
the furnace. If such a damper is manually operated, it must be equipped with a means to prevent
operation of either unit, unless the damper is in the full heat or cool position.
The duct system should again follow the current design standard of Air Conditioning Contractors
of America (ACCA) or ASHRAE Fundamentals volume.

All installations and services must be performed by qualified service personnel.
4
The most common location for the A-shaped coil (A style) is shown in Fig. 2.
Fig 2: Acceptable locations for the air conditioner evaporator coil.
NOTICE: The minimum coil pan clearance for a sectional or drum type heat exchanger is three
inches unless specified otherwise by the individual coil manufacturer.
C. BURNER INSTALLATION:
NOTICE: Remove all cardboard packing from around chamber before installing burner.
The oil burner will mount on three stud mounting bolts on the lower mounting plate covering the
opening in the front of the heat exchanger. The end of the burner tube should be inserted no
further than 1/4 inch back from the inside surface of the combustion chamber. A distance further
than 1/4 inch back from the inside chamber wall may cause impingement and sooting.
NOTE: O ERFIRE AIR TAP MAY BE LOCATED ON EITHER SIDE OF FLAME
INSPECTION CO ER. (See Fig. 3).
TWO PIECE MOUNTING PLATE
Fig. 3: Typical location of the overfire air tap

All installations and services must be performed by qualified service personnel.
5
Fig. 4: (Top view) Burner insertion illustration
When mounting the burner, the upper mounting plate (Fig. 3) must be removed to provide access
to the area in front of the combustion chamber. The combustion chamber can then be moved
forward or backward slightly to allow for adjustment in positioning the burner tube. A fiber
insulating sleeve or amulet is provided on the burner tube of specific Thermo Pride burners. (See
Fig. 5). See Thermo Pride burner application chart for type of insulator. Do not allow the burner
tube or end cone to physically touch or protrude into the chamber, as excess heat transfer could
result in destruction of the tube, end cone or both. The burner tube/end cone is properly
positioned, when the end is ¼ inch back from the inside surface of the combustion chamber wall.
When Installing the Riello Burner the bottom mounting plate must be changed out with the
mounting plate provided with the Riello burner.
NOTE: The loose-fill insulation that is included in a brown paper bag should be lightly placed
around the burner tube between the front of the combustion chamber and the burner mounting
plate. (DO NOT PACK THE INSULATION DOWN). The loose-fill insulation should be placed
in such a fashion that the surface of the insulation is sloped from the top of the combustion
chamber to the top of the lower mounting plate. The purpose of the loose insulation is to help
protect the burner tube, mounting plates and vestibule area from excessive temperatures.
CAUTION: When installing the burner, it should be noted that the loose fill insulation and fiber
chambers are made with ceramic fibers. Currently, there is no known chronic health effects in
humans associated with long term exposure to ceramic fibers. The International Agency for
Research on Cancer (IARC) based on its review of studies that injected ceramic fiber into the
abdomens of hamsters and rats have classified fibrous glass wool, mineral wool (both rock wool
and slag wool) and ceramic fiber as group 2B carcinogens. A group 2B agent is considered by
IARC to have the possibility of being carcinogenic to humans. IARC has also classified these
fibrous materials as group 2A carcinogens when they have undergone long term exposure to
temperatures greater than 18000F. A group 2A agent is considered to have the probability of
being carcinogenic to humans. For these reasons, we suggest the use of a 3M 9900, 3M 8710 or
equivalent mask when working with any ceramic fiber products. For further information, contact
the Manager of Customer Service for Rex Roto Corporation at [phone]

All installations and services must be performed by qualified service personnel.
6
Fig. 5: (Side view) Burner insertion illustration
D. FUEL SYSTEM INSTALLATION
In situations where the oil storage tank is installed at the same level with, or above, the burner, a
single oil supply line run from the oil tank to the burner will be usually be adequate. No return line
will be required. If the oil tank is installed below the burner and the lift exceeds approximately 8-
ft., an oil supply line and an oil return line are recommended. When connecting a return line to the
pump a bypass plug must be installed in the pump, see instruction provided with the burner.
Refer to the Standard for the Installation of Oil-Burning Equipment, NFPA 31-2001, and the oil
burner operating instructions for detailed information on oil storage tank & oil supply/return line
installation.
NOTICE We recommend installing a high efficiency oil filter, in the oil supply line, capable of
filtering 10 to 20 micron diameter (or preferably smaller) particles from the fuel.
E. WIRING
All wiring must conform to the provisions of local codes or in the absence of these codes with the
provisions of the National Electrical Code, ANSI/NFPA70 (Latest Edition).
The following items are guidelines to complete the wiring portion of the installations.
1. Install the room thermostat according to instructions provided with thermostat. Set the
anticipator to .8 amps.
2. The furnace must be grounded in accordance with local codes and with the National Electrical
Code, ANSI/NFPA70 (Latest Edition).

All installations and services must be performed by qualified service personnel.
7
III. STARTING THE UNIT
A. INITIAL OPERATION OF THE FURNACE
WARNING: To avoid possible explosion, DO NOT attempt to light the burner if
1. Oil has accumulated in the base of the combustion chamber.
2. The furnace is full of fuel vapors.
3. The combustion chamber is very hot.
CAUTION: The oil burner must be installed and adjusted using recently (within the last year)
calibrated combustion instruments by a qualified heating contractor prior to placing the furnace in
operation. Refer to this manual and the oil burner instruction manual for details.
To minimize initial fuel oil and combustion odors, ventilate the building well while operating the
furnace for the first time.
Do not run the oil pump dry (without oil) for more than two (2) minutes. Damage to the oil pump
may result.
1) Turn the electrical disconnecting switch to the “OFF” position.
2) Set the room thermostat above room temperature.
3) Be sure the oil tank is full of clean # 2 fuel oil.
4) Open all shutoff valves in the oil line.
5) Turn on the electrical disconnecting switch and prime the burner oil pump according to
the pump manufacturer’s instructions.
6) When ignition is established, make a temporary air adjustment for a clean, smoke-free
flame. At this point, the final burner adjustment should be made using test instruments to
measure oil pump pressure, smoke number, carbon dioxide (CO2), carbon monoxide (CO),
draft, and flue gas temperature.
B. BURNER ADJUSTMENT
In order to achieve the best combustion efficiency, the following procedure is recommended.
Measure the oil pump pressure. If required, adjust it to deliver the appropriate pressure for the
burner. See Table 2 for correct pump pressures.
Carbon Dioxide (CO2) and Carbon Monoxide (CO) – In order to assure that proper and safe
combustion are taking place, carbon dioxide and carbon monoxide measurements must be taken.
A CO2 reading within the limits of Table 2 with no measurable CO is desirable. The maximum
acceptable CO reading is less than 50 PPM. If the CO reading is too high, open the burner air
shutter, or air band, slightly to permit more combustion air to the flame. Recheck the CO level
and adjust as required.
Draft – Draft measurements should be taken through the overfire port and in the vent connector,
not more than 12 inches away from the furnace outlet. A 5/16 in. hex washer head bolt plugs the
overfire port in the burner mounting plate. Remove the bolt and insert a suitable draft
measurement gage. After the chimney (or stack gas passageway) has warmed up to operating
temperature, approximately 15 to 20 minutes of burner operation, adjust the barometric damper

All installations and services must be performed by qualified service personnel.
8
to obtain the correct overfire draft reading. See table 2. The draft measured at the flue (stack
draft) should read no more than 0.05 in. W.G.
NOTICE The overfire draft is the more important measurement and should be used to adjust the
setting of the barometric draft control.
Flue Gas Temperature – The flue gas temperature will vary depending on heat input rate, air
temperature rise across the heat exchanger, and air flowrate through the furnace. To prevent
excessive water vapor condensation from the flue gases, the gross flue gas temperature should not
fall below 330ºF. In addition, if the gross flue gas temperature exceeds 550ºF, the heating
efficiency of the furnace will be reduced.
To reduce high flue temperatures, after properly adjusting the burner, check for blocked
supply/return airflow. Remove any blockages, increase fan speed, or consider reducing the
furnace heat input rate. Also, verify there is no air leakage into the combustion chamber from
around the burner mounting flange or heat exchanger mounting plate. If flue gas temperatures are
too low, consider increasing the heat input rate or reducing the amount of supply/return airflow.
1Cycle the furnace several times to verify the burner lights off and shutdown smoothly without
excessive noise or smoke production.
Table 2: Oil Burner Application and Specifications
Furnace Model OL20FA151T60(B/R) , OL20RA151T60(B/R)
Burner Model Beckett AFG Riello F5
Nozzle (GPH/Angle/Pattern) 1.35/80°/B 1.1/60°/A
Heat Output (BTUH) 153,000 153,000
Oil Pump Pressure (PSIG) 100 145
Burner Head Type F12 Fixed
Head Protector Sleeve None
Head Tubualtor Setting Z =1.25 in Turbulator 3.5
Air Band Setting 0 NA
Air Shutter Setting 8 3.5
Overfire Draft (in. W.G.) -.01 -.01
Smoke Spot, Maximum 0 0
CO2 (%) 11.5 11.5
CO (PPM) < 50 < 50
C. AIRFLOW AND TEMPERATURE RISE
The supply/return airflow shall be set to obtain an air temperature rise, across the furnace, in the
range of 55 to 85ºF. Since the flow resistance of each duct system is slightly different, the airflow
(fan speed) may have to be changed in the field to achieve a satisfactory temperature rise. One
way to measure the temperature rise across the furnace is to insert temperature measuring devices
(e.g. thermometers) into the return air duct and into the supply air duct about 12 inches from the
furnace. After the furnace has been firing continually for over 20 minutes, read the temperature
difference between the two (2) thermometers. The temperature difference should not exceed

All installations and services must be performed by qualified service personnel.
9
85ºF, nor be less than 55ºF. For better energy efficiency, a temperature rise closer to 70ºF is
recommended. Refer to wiring diagram for available blower speeds. Minimum return air
temperature to prevent condensation in the heat exchanger is 55°F.
I. TROUBLESHOOTING AND SER ICE
A. FAN CONTROL
This furnace is equipped with a fan timer control board. The fan operation is determined by the
fan on delay and fan off time delays on the control board. In most cases the factory setting will be
sufficient for performance and homeowner comfort. If adjustments are needed refer to the wire
diagram in this manual or on the furnace rear door for available time delay settings.
The control also has diagnostic features. A green light will illuminate under the thermostat
terminal that is being activated. Also any time the board receives a call from the thermostat a red
light near the center of control will illuminate.
If a limit switch opens the red light will flash, power will be interrupted to the Buner and the
circulating air blower will be energized. The blower will continue to run and the burner will not be
energized after the limit closes until the blower off delay has expired.
B. LIMIT POSITION AND LOCATION
cWARNING: The predetermined fan and limit locations on all of the Thermo Pride oil fired
furnaces have been tested and approved by Thermo Products, LLC. Any attempt to relocate these
safety controls or replace these safety controls with a control that is not approved, or is
incompatible, may result in personal injury, substantial property damage or death.
C. BURNER TROUBLSHOOTING
For troubleshooting the oil burner, reference the burner manufactures instructions.
D. HEAT EXCHANGER CLEANING INSTRUCTIONS
cWARNING: The heat exchanger must be cleaned by a qualified service person.
It is important to inspect and clean the heat exchanger once a year, or as necessary, to remove any
build-up of soot. A layer of soot on the inside of the heat exchanger will act as an insulator and
reduce heat transfer, resulting in less efficiency.
To clean the heat exchanger, first turn off all power to the unit. Next, remove the access panel
(see below and beginning of following page) immediately above the burner (on the horizontal
furnace, it will be located to the side of the burner) to gain entry to the clean-out covers, refer to
figure 6. This panel is identified with a label. Remove clean-out covers, the vent connector pipe to
the chimney, the burner, and the burner mounting plates. When removing the clean-out covers,
special care must be taken not to damage the gaskets. Should the gaskets separate, crack, break,
or be unsuitable for reuse, the gasket must be replaced before reattaching the clean-out covers.

All installations and services must be performed by qualified service personnel.
10
Fig. 6: Typical Heat Exchanger Cleanout Cover Locations.
With access to the inside of the heat exchanger through the burner area, clean-out openings, and
vent pipe connection, it is possible to use a long, flexible wire brush and an industrial type vacuum
cleaner to remove any soot build-up. NOTE: A one inch (outside diameter) vacuum cleaner hose
will fit into the radiator.
To vacuum and brush the outer radiator of the heat exchanger, go through the clean-out openings
in both directions, as shown in figure 7, below.
Fig. 7: Recommended method and device for cleaning inside of heat exchanger.
Reassemble the furnace to its original construction. Remount the burner being certain that the air
tube is properly inserted into the chamber opening (see section D). If heavy soot deposits were
found in the heat exchanger, this may indicate the burner is out of adjustment.
. INSTALLER'S INSTRUCTIONS TO USER
After completing the installation, the installer shall inform and/or demonstrate to the homeowner
1. The location of all the instructions in the furnace and that these instructions and the users
information manual must be kept along with instructions for any accessories in the plastic
pouch on the inside of the furnace.
2. The location and use of the manual oil shut off valve and furnace electrical disconnect switch.
Instruct user to always shut off oil before shutting off electric power.

All installations and services must be performed by qualified service personnel.
11
3. The sequence of operation of the furnace.
4. The correct operation and maintenance of the appliance as outlined in the users information
manual.
5. That failure to maintain and operate this furnace in accordance with these instructions could
result in hazardous conditions, bodily injury, property damage and may void the limited
warranty on the furnace.
6. Review with and encourage the user to read the label reproductions and all warnings and
instructions outlined in this Manual.
Recommend that the user have a qualified heating contractor inspect the furnace at the start of
each heating season. Inform the user of the frequency of inspection required for each item in
Section III of the User’s Manual
III. USERS INFORMATION SECTION
A. COMBUSTION AIR SUPPLY: The burner requires a generous amount of clean combustion
air to operate safely. Lack of adequate combustion air can result in erratic operation of the burner,
noisy combustion, or fuel odors in the air. Never block the furnace from the supply of combustion
air. If there is an exhaust fan, dryer or return air grill in the furnace room, there should be
increased concern and additional efforts may be required to provide adequate combustion oil to
the furnace at all times.
B. OIL SUPPLY: Do not allow the fuel tank to run completely empty. During the summer, keep
the tank full to prevent condensation of moisture on the inside surface of the tank. If the fuel tank
runs completely dry, it may be necessary to purge the lines of trapped air. Contact a qualified
technician to bleed the lines and restart the burner. Turn the oil supply valve off if the burner is
shut down for an extended period of time.
C. INSPECTION AREAS
ESTIBULE: The furnace vestibule area or burner compartment should be inspected by
removing the front door of the furnace and looking for signs of excessive heat such as
discoloration of components materials damage, from rust or corrosion, soot or carbon build-up.
EXTERIOR OF FURNACE: The furnace exterior should be inspected for signs of excessive
heat such as discoloration of materials and damage from rust or corrosion.
FLUE PIPE, ENT PIPE OR CONNECTOR: The furnace vent pipe should be inspected for
signs of rust, corrosion pitting or holes in pipe, and leakage around seams in pipe, indicated by
soot or condensate streaks.
CHIMNEY OR ENTING SYSTEM: The furnace venting system should be inspected for
signs of rust, corrosion pitting or holes, and signs of condensation or moisture leakage from the
venting system.
If any of the above symptoms are evident, call a qualified heating contractor for assistance.

All installations and services must be performed by qualified service personnel.
12
cCAUTION: Do not attempt to make repairs yourself.
cWARNING: The area around the furnace should be kept free and clear of combustible liquids
and material, especially papers and rags.
cWARNING: never burn garbage or refuse in your furnace. Never try to ignite oil by tossing
burning papers or other material into your furnace.
cWARNING: Thermo Products oil furnaces are designed to burn No. 1 or No. 2 distillate fuel
oil or B5 distillate fuel oil. Never use gasoline or a mixture of oil and gasoline.
cCAUTION: DO NOT ATTEMPT TO START THE BURNER WHEN:
1. Excess oil has accumulated.
2. The furnace is full of vapors
3. The combustion chamber is very hot.
If one or more of these conditions exist cantact a qualified service person.
D. STARTING THE BURNER:
1. Turn the main service switch to "OFF" position.
2. Set thermostat substantially above room temperature.
3. Open shut-off valves in oil supply line to burner.
4. Turn service switch to furnace "ON". If burner starts and runs, but stops again on lockout, it
may be necessary to bleed the lines or make burner combustion air adjustments. Contact a
qualified service person to adjust and start burner.
E. FILTER CLEANING AND LOCATION
cWARNING: To avoid injury from moving parts, hot surfaces, or electrical shock, shut off the
power to the furnace before removing any furnace access doors to service the air filters.
The air filters should be inspected each month and cleaned when dirty. Cleaning the air filters
frequently may reduce airborne contaminants from entering the furnace and depositing in the
furnace, duct system and home. To clean a dirty filter, first remove the blower compartment door
at the rear of the furnace, refer to figure 8. Remove the dirty filter from the filter rack and clean it
with a mild soap and water solution. Make sure filter is thoroughly dry before replacing. Replace
the blower compartment door.
Fig. 8: Location of the air filter and blower compartment access door on the typical lowboy
furnace.

All installations and services must be performed by qualified service personnel.
13

All installations and services must be performed by qualified service personnel.
14
APPENDIX-A Replacement Parts List
Replacement Parts for OL20FA151T60