Trane THV1M087A936SA Service manual

Service Facts
© 2009 Trane All Rights Reserved
NOTICE: Since the manufacturer has a policy of continuous product and product data
improvement, it reserves the right to change design and specifications without
notice.
IMPORTANT — This document contains a wiring diagram and service information. This is customer property and is to
remain with this furnace. Please return to service information pack upon completion of work.
DISCONNECT POWER BEFORE SERVICING
WARNING
OIL FIRED CENTRAL FURNACE
THV1M087A936 - 948SA, TLF1M087A936 - 948SA
TLR1M087A936 - 948SA, TDF1M087A936 - 948SA
Oil Fired Furnace Specifications
Model THV1M087A936 & 948SA TLF1M087A936 & 948SA
TLR1M087A936 & 948SA TDF1M087A936 & 948SA
Type Upflow - Highboy Upflow - Lowboy Downflow - Horizontal
Heat input Rate (BTUH): 140,000 119,000 105,000 84,000 140,000 119,000 105,000 84,000 140,000 119,000 105,000 84,000
Nominal Thermal Efficiency (%): 83.6 84.2 83.8
Heating Capacity (BTUH): 114,000 98,000 87,000 70,000 114,000 98,000 87,000 70,000 114,000 98,000 87,000 70,000
Nominal Temperature Rise (deg. F): 85 85 85
Minimum AFUE (I.C.S.) Rating (%): THV1M087A936SA - 82.9%
THV1M087A948SA - 82.6%
TLF1M087A936SA - 82.9%
TLF1M087A948SA - 82.7%
TLR1M087A936SA - 85.0% **
TLR1M087A948SA - 82.4%
TDF1M087A936SA - 84.8%
TDF1M087A948SA - 82.6%
Burner Specifications: R.W. Beckett Pressure Atomizing
Type, Model AF
R.W. Beckett Pressure Atomizing Type,
Model AF
R.W. Beckett Pressure Atomizing Type,
Model AF
Air Tube Length (in.): 5.875, Effective 5.875, Effective 5.875, Effective
Burner Head Type: Fixed, Flame Retention Fixed, Flame Retention Fixed, Flame Retention
Fuel Type: # 2 Distillate (Domestic Heating Oil) # 2 Distillate (Domestic Heating Oil) # 2 Distillate (Domestic Heating Oil)
Nozzle Rating For Beckett AF (GPH): 1.00 0.85 0.75 0.60 1.00 0.85 0.75 0.60 1.00 0.85 0.75 0.60
Spray Angle (deg.): 80 80 80
Spray Pattern: Hollow Hollow Hollow
Oil Pump Pressure (PSIG): 130 130 130
Ignition Control Type: Interrupted, Direct Spark Interrupted, Direct Spark Interrupted, Direct Spark
Pre / Post Purge Feature(s): Yes / no Yes / no Yes / no
Automatic Oil Solenoid Valve: Yes Yes Yes
Blower Drive: Direct Direct Direct
THV1M087A936SA THV1M087A948SA TLF1M087A936SA
TLR1M087A936SA
TLF1M087A948SA
TLR1M087A948SA TDF1M087A936SA TDF1M087A948SA
Diameter x Width (in.): 10 x 9 11 x 11 10 x 9 10 x 9 10 x 9 11 x 9
No. Used: 1 1 1 1 1 1
Speeds (no.): 4 4 4 4 4 4
CFM vs in. w.g.: See Fan Performance Table See Fan Performance Table See Fan Performance Table
Motor HP: 1/2 3/4 1/2 3/4 1/2 3/4
R.P.M.: 1075 1130 1075 1130 1075 1130
Volts / Ph. / Hz.: 120 / 60 / 1 120 / 60 / 1 120 / 60 / 1
Filter Furnished?: Yes Yes No
Type Recommended: Throwaway Throwaway Throwaway
No. - Size x Thick: 1 - 16 x 25 x 1 2 - 10 x 20 x 1 Not Supplied
Vent - Size (in.): 6 6 6
Gross Heat Exchanger Area (sq. ft.): 27.8 27.8 (Front Flue) / 30.0 (Rear Flue) 27.8
Suply / Return Size (in. x in.): See Outline Drawing See Outline Drawing See Outline Drawing
Combustion Chamber Type: Preformed, Refactory
(Ceramic Fiber Matrix Material)
Preformed, Refactory
(Ceramic Fiber Matrix Material)
Preformed, Refactory
(Ceramic Fiber Matrix Material)
Total Current (amps.): 12.1 19.8 12.1 19.8 12.1 19.8
Max. Fuse Size (amps.): 15 30 15 30 15 30
Dimensions
uncrated (in.):
H X W X D
58 X 22.25 X 31
H X W X D
41.5 X 22.25 X 47
H X W X D
22.25 X 61.25 X 22.25
Weight
Shipping (lbs.) / Net (lbs.) 260 / 250 300 / 290 280 / 270
** Energy Star
OFF-SF-1B
AVAILABLE IN FRENCH CANADIAN (FC)

2OFF-SF-1B
Service Facts
Furnace Airflow (CFM) vs. External Static Pressure (in. WC)
Model Speed
Tap 0.1 0.2 0.3 0.4 0.5 0.6 0.7
Highboy
THV1M087A936SA
High 1508 1468 1407 1345 1278 1202 1120
Med-High 1420 1361 1310 1242 1176 1096 1019
Med-Low 1308 1263 1220 1174 1103 1031 953
Low 1189 1150 1113 1072 1009 936 870
Highboy
THV1M087A948SA
High 1974 1913 1854 1766 1695 1621 1547
Med-High 1694 1643 1589 1534 1477 1406 1339
Med-Low 1413 1384 1348 1315 1280 1235 1184
Low 1166 1144 1127 1105 1076 1027 983
Lowboy
Front Flue
TLF1M087A936SA
High 1688 1648 1595 1522 1447 1373 1309
Med-High 1372 1331 1290 1246 1200 1146 1079
Med-Low 1173 1156 1134 1108 1082 1043 989
Low 999 993 975 956 931 888 807
Lowboy
Front Flue
TLF1M087A948SA
High 1920 1822 1730 1649 1564 1483 1397
Med-High 1620 1572 1511 1443 1376 1311 1224
Med-Low 1358 1339 1309 1264 1216 1167 1098
Low 1103 1106 1080 1056 1023 981 858
Lowboy
Rear Flue
TLR1M087A936SA
High 1669 1599 1541 1475 1409 1329 1231
Med-High 1410 1345 1299 1246 1184 1127 1171
Med-Low 1196 1184 1149 1111 1066 1023 938
Low 1007 1004 985 963 915 845 749
Lowboy
Rear Flue
TLR1M087A948SA
High 1844 1771 1694 1612 1538 1451 1355
Med-High 1622 1545 1484 1419 1356 1274 1172
Med-Low 1366 1330 1303 1247 1187 1124 1046
Low 1110 1107 1091 1068 1031 973 887
Downflow/Horizontal
TDF1M087A936SA
High 1616 1550 1482 1406 1347 1231 1144
Med-High 1447 1397 1343 1284 1209 1127 1043
Med-Low 1320 1274 1228 1176 1111 1043 950
Low 1166 1139 1107 1064 1017 955 871
Downflow/Horizontal
TDF1M087A948SA
High 1901 1837 1790 1714 1648 1584 1496
Med-High 1615 1572 1521 1468 1412 1355 1308
Med-Low 1355 1342 1311 1273 1230 1183 1133
Low 1116 1105 1084 1058 1038 1001 955

OFF-SF-1B 3
Service Facts
CFM vs. Temperature Rise
Model Heating
Capacity 800 900 1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 2000
Highboy
THV1M087A936SA
70,000 72 65 59 54 50 46 43
87,000 90 81 73 67 62 58 54
98,000 101918276706560
114,000 117 106 96 88 81 75 70
Highboy
THV1M087A948SA
70,000 65 59 54 50 46 43 41 38 36 34 32
87,000 81 73 67 62 58 54 50 47 45 42 40
98,000 91 82 76 70 65 60 57 53 50 48 45
114,000 106 96 88 81 75 70 66 62 59 56 53
Lowboy
Front Flue
TLF1M087A936SA
70,000 72 65 59 54 50 46 43 41
87,000 90 81 73 67 62 58 54 50
98,000 101918276706560 57
114,000 117 106 96 88 81 75 70 66
Lowboy
Front Flue
TLF1M087A948SA
70,000 72 65 59 54 50 46 43 41 38 36 34
87,000 90 81 73 67 62 58 54 50 47 45 42
98,000 101918276706560 57 53 50 48
114,000 117 106 96 88 81 75 70 66 62 59 56
Lowboy
Rear Flue
TLR1M087A936SA
70,000 81 72 65 59 54 50 46 43 41 38
87,000 101 90 81 73 67 62 58 54 50 47
98,000 113 101918276706560 57 53
114,000 Not
allowed 117 106 96 88 81 75 70 66 62
Lowboy
Rear Flue
TLR1M087A948SA
70,000 72 65 59 54 50 46 43 41 38 36
87,000 90 81 73 67 62 58 54 50 47 45
98,000 101918276706560 57 53 50
114,000 117 106 96 88 81 75 70 66 62 59
Downflow/Horizontal
TDF1M087A936SA
70,000 72 65 59 54 50 46 43 41
87,000 90 81 73 67 62 58 54 50
98,000 101918276706560 57
114,000 117 106 96 88 81 75 70 66
Downflow/Horizontal
TDF1M087A948SA
70,000 65 59 54 50 46 43 41 38 36 34
87,000 81 73 67 62 58 54 50 47 45 42
98,000 91 82 76 70 65 60 57 53 50 48
114,000 106 96 88 81 75 70 66 62 59 56
The unshaded area is the recommended operating range for HEATING comfort

4OFF-SF-1B
Service Facts
SERVICE
▲
WARNING
!
EXPLOSION HAZARD
DO NOT use this furnace if any component has been
underwater. Immediately call a qualified heating contractor
to inspect the furnace and replace any part of the soft
ceramic fiber refractory chamber or furnace control system
that has been exposed to water.
Failure to follow this warning may cause property damage,
personal injury or death.
TROUBLESHOOTING
▲
WARNING
!
SHOCK HAZARD
When testing electrical equipment, always follow standard
electrical safety procedures.
Before beginning these troubleshooting procedures, always
review these basic points:
1) Check for 120 VAC power to the furnace. If there is no
voltage, check the disconnecting switch for circuit breaker
trip or blown fuses.
2) Make sure the room Comfort Control is set on the
heating mode and is “calling for heat”.
3) Check for sufficient oil supply and that all oil shutoff
valves are open.
4) To successfully service this oil furnace, the following
recently (within the last year) calibrated instruments
must be available.
- Smoke spot test kit with Bacharach-type oil burner
smoke scale
- Carbon dioxide (CO2) and carbon monoxide (CO) test
kit or analyzer
- Flue gas temperature measuring instrument
- Draft gauge, capable of measuring 0.01 to 0.25 in.
W.G. draft (Draft is the pressure differential between
the static pressure measured in the vent pipe, or just
above the combustion chamber, and the indoor
atmospheric pressure. Under normal operating
conditions, it will have a negative value, i.e. the
pressure in the combustion chamber and the vent
system are less than room air pressure.)
- Multimeter (analog or digital type)
- Oil pressure gauge, capable of measuring at least 0
to 200 PSIG
- Burner electrode and nozzle setting gauge
5) Be familiar with the correct operation of these instru-
ments as well as how to adjust the oil burner settings
(refer to burner manufacturer’s literature).
▲
WARNING
!
EXPLOSION HAZARD
Repeated operation of the oil primary safety control reset
button can cause a build-up of unburned oil in the combus-
tion chamber. An accumulation of oil in the combustion
chamber is a hazardous situation and may cause a fire or
explosion.
A. Symptom: Furnace does not operate.
Items to check:
1) Make sure the disconnecting switch is “ON” and the
circuit breaker has not tripped, or fuses have not blown.
2) Confirm there is 120 VAC at the fan center junction box.
3) Confirm the room Comfort Control is wired correctly, set
on the “HEAT” mode, and “calling for heat”.
4) On the Honeywell oil primary control, lockout has
occurred if the indicator light (an LED) is rapidly flash-
ing; depress the oil primary reset button.
If the burner does not operate properly after depressing
the reset button three (3) times, turn off the electrical
power to the furnace and close the manual oil shutoff
valve. Reference the Honeywell literature insert shipped
with the furnace for detailed diagnostic information.
B. Symptom: Burner short cycles or “locks out” on oil
primary safety control.
Items to check:
1) Fuel oil tank nearly empty or oil flow restriction. Refill oil
tank, replace oil filter, open all shutoff valve(s), and purge
oil line(s) of air.
2) If the oil primary control has not “locked out” (e.g., on the
Honeywell primary control, the indicator light is not
flashing), measure the electrical current to the room
Comfort Control. Set the heat anticipator on the room
Comfort Control to the current value measured. Also,
check the wiring between the Comfort Control and
primary control to be sure it is correct and no loose
connections exist.
3) Inspect the burner flame sensor, “cad cell”, to be sure the
lens is clean and the cell is correctly aimed at the flame.
4) Inspect the burner oil nozzle for blockages and signs of
deterioration. Replace the nozzle, if required. Also,
measure and reset the electrode gap and alignment. If
badly worn or deformed, replace the electrodes. (Refer to
the burner manufacturer’s instructions.)
5) Confirm there is a strong spark across electrodes.
Generally, viewing a spark jump across the electrodes is
sufficient indication the ignition transformer is operating
correctly. Testing an electronic ignition transformer
with a transformer tester is generally not recom-
mended.
6) Inspect the heat exchanger through the cleanout ports for
signs of excessive soot, scale buildup, or blockage. If a
heavy deposits are present, clean the heat exchanger.
C. Symptom: Burner short cycles on high limit thermo
stat, but does not “lock out” on oil primary
safety control.
Items to check:
1) Open dampers or registers in the air distribution system.
Clear any duct system restrictions.
2) Inspect and clean all air filters in the air distribution
system.
3) Inspect blower for interference with rotation or locked
rotor condition. Also, confirm the blower wheel is secured
to the fan motor shaft.
4) The fan motor or run capacitor may be damaged. Test
and replace the motor or capacitor, as required.
5) Increase fan speed.

OFF-SF-1B 5
Service Facts
D. Symptom: Unable to achieve clean combustion by
making burner air adjustments.
Items to check:
1) Measure the burner air tube insertion depth and
alignment. The end of the tube should not protrude
inside the combustion chamber. The end of the tube
should be approximately ¼ inch away from the inner
wall surface of the combustion chamber.
2) Inspect the oil nozzle for excessive wear, blockage, or
deterioration. Measure and, if necessary, reset the nozzle
depth or turbulator location with respect to end of the
burner head. Replace the nozzle, if necessary (refer to the
oil burner manufacturer’s instructions).
3) Measure the oil pump pressure. If required, adjust the
pressure to burner nameplate value. (This is the typical
minimum pressure required to obtain the full input rate
from the furnace).
4) Verify the burner is configured as specified in Table
1 and adjusted according to the Initial Burner
Operation section of this manual (page 8) and the
burner manufacturer’s instructions.
5) Measure the overfire draft. If required, adjust the
barometric damper to increase the stack draft to obtain
an overfire draft of 0.02 in. W.G. with the burner operat-
ing. (This is the typical minimum draft required to
obtain the specified flue gas combustion analysis values
given in Table 1.) If the specified overfire draft cannot be
obtained with a stack draft of 0.02 in. W.G., the heat
exchanger may be partially blocked and could require
cleaning.
6) Measure the draft at the point where the vent connector
attaches to the heat exchanger flue pipe. With the burner
operating, the stack draft should not exceed 0.05 in. W.G.
If the stack draft has been adjusted above this value to
give the proper overfire draft, the heat exchanger will
require cleaning.
If there is little or no stack draft, the chimney flue way
may require cleaning, the chimney is too restrictive, or a
downdraft condition exists.
E. Symptom: Furnace blower will not start.
Items to check:
1) Confirm there is 120 VAC at the blower motor terminal
block.
2) If there is not 120 VAC at the blower terminal block,
measure the voltage at the fan center relay. If the fan can
be activated by itself from the room Comfort Control
subbase, confirm it will operate.
If so, the fan center relay contacts may be burnt, or
damaged, or the fan limit control may be defective. Test
these components and replace the defective component,
as required.
3) If there is 120 VAC at the blower terminal block, either
the run capacitor or blower motor may be damaged. Test
and replace the capacitor or motor, as required.
F. Symptom: Blower cycles on and off after the burner
has shutdown.
Item to check:
1) Increase the fan limit control differential. Typically, the
fan “off” setting should be 30 degrees F. below the fan
“on” setting. Adjust the setting as required.
▲
WARNING
!
FIRE HAZARD
If the fan and high limit control is faulty, it should be re-
placed. However, it must only be replaced by the same
make and model as the original. All the original temperature
settings should be duplicated on the replacement model as
well. REMOVE THE LOW VOLTAGE JUMPER IN THE CON-
TROL, IF EQUIPPED. See Figure 1. Refer to the electrical
diagram for proper electrical connections. (page 10 & 11)
FLAME SENSOR (“CAD CELL”) CHECKOUT
PROCEDURE
On the Honeywell oil primary control, to check the electrical
resistance of the flame sensor (referred to as a cadmium
sulfide photocell, or “cad cell”), depress the reset button on
the oil primary safety control while the burner is firing. The
oil primary control will report the measured resistance range
of the cad cell by flashing the LED (light emitting diode) one
(1) to four (4) times. Refer to the oil burner manufacturer’s
instructions for further details.
For all primary controls, an alternate procedure to check the
flame sensor operation is as follows:
1) Remove the flame sensor lead wires from the terminals
(labeled “CAD CELL” on the underside of the Honeywell
control) of the oil primary safety control module. Start
the burner. Shortly after combustion is established,
place a temporary jumper wire across the cad cell
terminals, or leads, of the control. Connect an ohmmeter
across the flame sensor lead wires. The measured
resistance should be less than,
- 1600 Ohms for the Honeywell cad cell.
2) Stop the burner and remove the jumper wire.
3) With the burner off, measure the resistance of the flame
sensor with the ohmmeter. The resistance of the sensor
without “seeing” a light source (so-called “dark” cell
resistance) should be greater than,
- 20,000 Ohms for the Honeywell cad cell.
4) If the sensor resistances are outside the acceptable
ranges given above, confirm the lens of the cell is clean
and the cell is located correctly in the burner housing. If
the cell is clean and correctly located, replace the flame
sensor.
NOTICE: All resistances are approximate values only and
will vary depending upon the intensity of the light source
(flame or sunlight) and the condition or age of the cad cell.
11
11
1

6OFF-SF-1B
Service Facts
MAINTENANCE
Air Filter(s)
▲
CAUTION
!
BURN HAZARD - ROTATING FAN BLADES
To avoid injury from moving parts, hot surfaces, or electrical
shock, shut off the power to the furnace and allow the
furnace to cool BEFORE removing any furnace access
doors to service air filters.
Highboy and lowboy furnace models are factory-supplied with
a permanent-type, air filter. Downflow/Horizontal models are
not shipped with a filter. However, external filters are re-
quired. At least twice a year, remove the air filter(s) for
cleaning. To clean a washable filter, soak it in water with a
mild detergent and then rinsing it with clean water. Allow the
filter to air dry before reinstalling it in the furnace filter rack.
If the furnace, or duct system, is equipped with disposable-
type (paper element), air filters, inspect them every month for
an excessive accumulation of dust and dirt. Replace dispos-
able air filters at least twice a year. Make certain the replace-
ment filter is the same size as the one being replaced.
The filter size is marked on the outer edge of the air filter.
Install the filter with the arrow marked on the filter pointing
toward the furnace.
Oil Burner
▲
WARNING
!
ANNUAL SERVICE REQUIRED
A qualified heating contractor MUST service the oil burner in
this furnace at least once a year.
Generally, service to the burner will involve a thorough
inspection and cleaning of the burner, replacement of the oil
nozzle and oil filter, and readjustment of the burner to
achieve proper ignition and clean combustion.
Blower and Motor
NOTICE: The fan motor has sealed bearings that do NOT
require lubrication.
The blower and fan motor will not normally require any
service. This furnace is equipped with a directly-driven
blower. Therefore, it will not require any retensioning or
replacement of a drive belt.
Heat Exchanger
▲
WARNING
!
BURN HAZARD
DO NOT attempt to clean the heat exchanger unless
electrical power and fuel flow to the furnace are turned off
and the furnace is at room temperature.
▲
CAUTION
!
FRAGILE
The combustion chamber refractory material is fragile and
can be easily damaged. If the inner radiator of the heat
exchanger is cleaned, avoid scraping or hitting the walls of
the combustion chamber.
▲
CAUTION
!
FRAGILE
Do NOT brush or scrape the surface of the combustion
chamber. It can be easily damaged.
▲
CAUTION
!
ANNUAL SERVICE REQUIRED
A qualified heating contractor MUST inspect the heat
exchanger in this furnace at least once a year. If heavy
deposits are found, immediate cleaning is required.
All heat exchanger surfaces should be as clean as possible for
the most efficient operation of the furnace. The heat ex-
changer may require cleaning after every heating season, as
combustion of fuel oil tends to produce soot, particulate
matter, and scale, due to corrosion. These materials coat the
inner walls of the heat exchanger. This coating reduces the
heat transfer effectiveness of the heat exchanger and can
hinder the flow of flue gases from the furnace.
NOTICE: Accumulation of heavy soot deposits over one
heating season may indicate the oil burner is out of adjust-
ment.
The heat exchanger may be inspected and cleaned through
two (2) access, or cleanout, ports located in the burner com-
partment, on highboy and lowboy models, or protruding
through the front casing panel, on the horizontal/downflow
model. Each cleanout port consists of a 2-inch O.D. tube
closed by a pressed-in cap, refer to Figure 2.
Using a screwdriver, or a large pair of adjustable jaw pliers,
remove each cleanout port cap. With the aid of a portable
light source, peer into the heat exchanger. As much as pos-
sible, loosen all material and deposits clinging to the heat
exchanger walls using wire brushes, or any suitable tool.
Collect and remove this material by hand or with the assis-
tance of a vacuum cleaner and a nozzle-type attachment.
The heat exchanger may also be cleaned through the flue pipe
connection. With the furnace turned off and at room tempera-
ture, carefully remove the vent connector and the heat
exchanger flue pipe, if equipped, to inspect and clean the heat
exchanger.
The inner radiator of the heat exchanger may be cleaned from
the inside of the combustion chamber. This involves removal
of the burner and the burner mounting plate from the heat
exchanger.
Location and Design of the Highboy
Heat Exchanger Cleanout Port
2

OFF-SF-1B 7
Service Facts
Using a portable light source with a mirror inserted through
and into the heat exchanger, check for an accumulation of soot,
scale, and particulate matter on the walls and in the base of
the drum, or on the floor of the combustion chamber. If a
significant accumulation is present, it should be removed.
Use a flexible wire brush to loosen the deposits on the heat
exchanger walls. Remove any loose foreign material using a
vacuum cleaner. Replace all gaskets, if removed, with new
(unused) gaskets. Reassemble the burner mounting plate,
burner flange, and new gaskets in the reverse order they were
removed. A rubber mallet, or equivalent tool, may be useful
for reinstalling the caps in the cleanout tubes.
▲
WARNING
!
RE-INSTALL ALL PARTS
Should the unit be disassembled, all components, panels,
block offs, collars, gaskets and fasteners must be
reassembled as originally factory produced.
Failure to do so may result in property damage, injury, or
loss of life!
Flue and Chimney
At least once a year, thoroughly inspect the heat exchanger
flue pipe, the vent connector, the chimney, or vent, and the
barometric damper for signs of sagging, loose connections,
excessive corrosion, and deterioration. Clean, repair, or
replace any components for continued safe and proper
operation of the furnace.
INITIAL OPERATION OF THE FURNACE
INITIAL BURNER OPERATION
▲
WARNING
!
EXPLOSION HAZARD
To avoid possible explosion, DO NOT attempt to light the
burner if:
- Oil has accumulated in the base of the combustion
chamber.
- The furnace is full of fuel vapors.
- The combustion chamber is very hot.
▲
CAUTION
!
The
SERVICE INSTRUCTIONS
The oil burner must be installed and adjusted using recently
(within the last year) calibrated combustion instruments by
a qualified heating dealer prior to placing the furnace in
operation. Refer to this manual and the oil burner instruction
manual for details.
▲
CAUTION
!
MINIMIZE OIL ODOR
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.
To initially operate the furnace:
1) Turn the electrical disconnecting switch to the “OFF”
position.
2) Set the room Comfort Control 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.
- Refer to item (4) under the Troubleshooting section
of this manual for a list of required test instru
ments.
In order to achieve the best combustion efficiency, the
following procedure is recommended.
7) Measure the oil pump pressure. If required, adjust it to
deliver the appropriate pressure for the burner. The oil
pump should be set to produce 130 PSIG, for the R.W.
Beckett model AF burner.
8) Carbon Dioxide (CO2) and Carbon Monoxide (CO) – In
order to assure that proper and safe combustion is taking
place, carbon dioxide and carbon monoxide measure-
ments must be taken. A CO2reading within the limits of
Table 1 with no measurable CO is desirable. The maxi-
mum acceptable CO reading is about 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.
9) 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 to obtain the correct
overfire draft reading. The overfire draft should read
0.02 in. W.G. 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 measure-
ment and should be used to adjust the setting of the baro-
metric draft control.
10) 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 650ºF, the heating efficiency of
the furnace will be reduced.
To reduce high flue temperatures, after properly adjust-
ing 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.
11) Cycle the furnace several times to verify the burner
lights off and shutsdown smoothly without excessive
noise or smoke production.

8OFF-SF-1B
Service Facts
Furnace Model: All
Burner Model: R.W. Beckett, AF
Standard Nozzle: Delavan, 0.75 GPH / 80 deg. angle /
hollow cone
Oil Pump Pressure (PSIG): 130
Burner Head Type: F3
Head / Turbulator Setting: “Z” = 1.125 in.
Air Band Setting: Fully-closed
Air Shutter / Damper Setting: 5
Overfire Draft (in. W.G.): 0.02
Smoke Spot, Maximum (Bacharach Scale): # 1
Carbon Dioxide, CO2, Maximum (%): 13
Carbon Dioxide, CO2, Minimum (%): 12*
Carbon Monoxide, CO (PPM) 0
Oil Solenoid Valve Equipped: YES
Delay valve on Time (sec):
Postpurge Time (sec): None
Ignition Type: Interrupted
15 sec.
Table 1: Oil Burner Application and Specifications
* When operating these furnaces at the lowest input rate (84,000 BTUH), the carbon dioxide (CO2) value may not be
able to be adjusted above 12%. This is normal and does not necessarily indicate a problem.
SUPPLY/RETURN AIRFLOW AND AIR
TEMPERATURE
The supply/return airflow shall be set to obtain an air
temperature rise, across the furnace, in the range of 70 to
100ºF. See CFM vs Temperature Rise table, Page 3. 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. thermom-
eters) 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 tempera-
ture difference should not exceed 100ºF, nor be less than 70ºF.
A temperature rise of 85ºF is considered to be optimum for
comfort. For better energy efficiency, a temperature rise closer
to 70ºF is recommended.
The blower (fan) speed fan is adjusted by changing the fan
motor winding energized by the control system. The furnace is
set on the lowest fan speed, “L”, at the factory, refer to Table
2. To adjust the fan speed, follow this procedure:
a. Turn off all electrical power to the furnace at the discon-
necting switch.
b. Remove the blower compartment access door.
c. Move the orange wire from the low speed terminal block,
marked “L”, to the next higher fan speed (medium low),
marked “ML” on the terminal block, refer to Figure 3.
Other available higher fan speeds are medium high,
marked “MH” and high, marked “H”.
NOTICE: The red wire is normally positioned on the high fan
speed, for cooling applications. However, the red wire may
be moved to another terminal block position, as required.
FAN/LIMIT
CONTROL AS SHIPPED
RELOCATE FAN/LIMIT
CONTROL HERE
SUPPLY
AIR SUPPLY
AIR
R
ETURN
AIR RETUR
N
AIR
Horizontal left Horizontal right
Correct locations for the horizontal furnace high limit and fan control
6
3
Blower Motor Terminal Blocks and Wiring

OFF-SF-1B 9
Service Facts
d. Replace the blower compartment access door.
e. Restore electrical power to the furnace at the disconnect-
ing switch.
With the furnace operating, measure the air temperature rise
across the furnace again. If the value does not fall in the range
of 70 to 100°F, repeat the above procedure.
FURNACE LIMIT AND
BLOWER CONTROLS
All furnaces are equipped with a combined thermostatic high
temperature limit and blower (fan) control. The high tem-
perature limit is set such that it does not permit a supply
(discharge) air temperature above its setting. See Table 2.
The thermostatic fan control should be set so the greatest fuel
utilization efficiency of the furnace is obtained. Generally, a
blower “ON” setting of 130°F should give the best result.
After the burner shuts down, the circulating air blower will
continue to operate until the air temperature inside the
furnace falls below the lower setting on the fan control.
This delay on blower shutdown extracts residual heat from
the furnace heat exchanger that would ordinarily be lost to
the outdoor atmosphere. If a longer, or shorter, cooldown
period is desired, the fan control differential setting may be
reset to lengthen, or shorten, the cycle as desired. Refer to
Table 2 for the standard fan and high limit control settings.
In addition to the combined fan and limit control, the horizon-
tal /downflow furnace is equipped with an auxiliary high
limit temperature control located in the blower compart-
ment, refer to the electrical diagram on page 10. The purpose
of this control is to prevent overheating of the blower motor
and air filter(s), if airflow is severely reduced.
If the duct system becomes partially, or totally, blocked or the
furnace air filter(s) become excessively dirty causing the
blower to fail to circulate enough air, the thermostatic high
temperature limit (or, if equipped, the auxiliary high tem-
perature limit) may activate to prevent very high discharge
air temperatures from occurring.
Should airflow be restricted, the furnace might cycle on and
off too frequently or become inoperative. To correct this
condition, verify that all supply and return dampers and
registers in the air distribution system are open. If this fails
to resolve the problem, turn off the electrical power to the
furnace. Remove the blower compartment access door to
examine the air filter(s) and blower for blockages or a loose
blower wheel. (On the highboy and horizontal / downflow
furnaces, air filters should be mounted external to the furnace
casing.) If possible, correct the condition by cleaning or
replacing the air filter(s), freeing the blower wheel of any
foreign materials, or securing the blower wheel to the fan
motor shaft. Always replace the blower compartment
access door when service is finished. Restore electrical
power to the furnace.
High Limit Thermostat Setting (deg. F.): 230 (highboy / lowboy models)
190 (horizontal / downflow model)
Fan “On” Setting (deg. F.):
130
Fan “Off” Setting (deg. F.): 100
Standard Fan Speed as shipped Low, Orange Wire to “L” Terminal
Table 2: Standard Furnace Fan / Limit Control and Speed Settings
ROOM COMFORT CONTROL
Most room Comfort Controls are equipped with user adjust-
able, or selectable, levels of heat anticipation. This feature
helps to reduce the amount of room air temperature overshoot
that occurs after a heating cycle.
To adjust the heat anticipator, measure the electrical current
output of the oil burner primary safety control to the room
Comfort Control. (If measurement is not possible, the value of
current output may be marked on the cover of the control). Set
the Comfort Control heat anticipator to match the electrical
current output of the oil primary safety control.

10 OFF-SF-1B
Service Facts
ELECTRICAL DIAGRAMS FOR PSC 4 SPEED BLOWER DOWNFLOW / HORIZONTAL FURNACES

OFF-SF-1B 11
Service Facts
ELECTRICAL DIAGRAMS FOR PSC 4 SPEED BLOWER HIGHBOY & LOWBOY FURNACES

Since the manufacturer has a policy of continuous product and product data improvement, it reserves the
right to change design and specifications without notice.
Trane
6200 Troup Highway
Tyler, TX 75707
For more information contact
your local dealer (distributor)