Milwaukee THB High Boy, TLB Low Boy User Manual
Temp-O-Matic Oil Furnaces
THB High Boy
TLB Low Boy
Furnace Manual
KEEP THESE INSTRUCTIONS
WITH FURNACE FOR FUTURE
REFERENCE.
C US
Hazards that will cause severe personal injury,
death or substantial property damage.
Hazards that can cause severe personal injury,
death or substantial property damage.
INSTALLER – Read all instructions before
installing. Read page 2 first. Follow all instructions
in proper order to prevent personal injury or death.
• Consider ducting, fuel supply, venting and
installation when determining furnace location.
• Any claims for damage or shortage in shipment
must be filed immediately against the transportation
company by the consignee.
Do not store or use gasoline or other flammable
liquids or vapors near this furnace or any other
appliance.
Ventilate house while operating furnace for the first
time. Odors may be emitted for a brief period.
Do not alter this furnace in any way. The
manufacturer will not be liable for any damage
resulting from changes made in the field to the
furnace or its components or from improper
installation. Failure to comply could result in severe
personal injury, death or substantial property
damage.
Printed on 100% recycled paper 670-000-005/1010
Hazard definitions
Contents Page
Read this first!............................................................................ 2
1. Prepare furnace location............................................................ 3
2. Prepare furnace and place in position ....................................... 6
3. Connect supply and return ducts...............................................8
4. Venting..................................................................................... 11
5. Connect fuel oil piping ............................................................. 12
6. Wire furnace and burner..........................................................12
7. Start-up....................................................................................16
8. Checkout procedure ................................................................ 16
9. Troubleshooting....................................................................... 18
10. Service and maintenance ........................................................ 19
11. Components and replacement parts........................................ 23
12. Dimensions and ratings ........................................................... 29
13. Owner’s information .................................................................34
Hazards that will or can cause minor personal
injury or property damage.
Special instructions on installation, operation or
maintenance that are important but not related to
personal injury or property damage.
USER – Please read the following. Failure to
comply could result in severe personal injury, death
or substantial property damage.
• This manual is for use only by your qualified
heating installer / service technician.
• Please see the Owner’s information only, on back
page of this manual.
• Have the furnace serviced by a qualified service
technician, at least annually.
This manual must only be used by a qualified
heating installer / service technician. Furnace and
burner must be installed and serviced only by a
qualified heating installer / service technician.
Failure to comply could result in severe personal
injury, death or substantial property damage.
When calling or writing about the furnace – Please
have furnace model number and serial number from
the rating label. You may list the serial number and
model number in the space provided on the
“Installation and service certificate” found on
page 17.
READ THIS FIRST!
Service and maintenance –
1. To avoid electric shock, disconnect electrical supply before
performing maintenance.
2. To avoid severe burns, allow furnace to cool before performing
maintenance.
3. Perform service and maintenance as described in this manual
and the burner manual.
4. Do not attempt to make adjustments to the blower or motor while
the furnace is in operation. Disconnect power to the furnace and
be sure all parts have stopped moving before attempting
adjustments or maintenance.
5. The burner must be set up and adjusted using combustion test
instruments. Visual examination of the flame alone cannot
determine combustion performance.
Operation -
6. Do not use the furnace as a construction heater.
7. Do not operate any furnace if the heat exchanger is damaged,
corroded or pitted. Toxic flue products could enter the air
stream.
8. Do not jumper, attempt to by-pass or override any limit control.
9. Do not block flow of combustion or ventilation air to furnace. Do
not block or obstruct the air openings in the furnace casing.
10. Do not store or use combustible materials, gasoline, or other
flammable liquids or vapors in the furnace area.
11. Do not operate the furnace if the furnace area will be exposed to
air contaminants as described on page 5.
12. Should overheating occur, do not turn off or disconnect electrical
supply to furnace. Instead, shut off the oil supply at a location
external to the appliance, if possible.
13. Do not use this furnace if any part has been under water.
Immediately call a qualified service technician to inspect the
furnace and to replace any part to the furnace, control system or
burner that has been under water.
14. Do not operate furnace if temperature rise through heat
exchanger exceeds 85
Installation –
1. Be sure to level the furnace, using a spirit level on the front and
one side. If the furnace is not level, oil can drip into the
combustion chamber after burner cycling, causing fouling of the
heat exchanger and the burner head.
2. Make sure the legs are in contact with the floor to distribute the
load and prevent the possibility of undue noise or vibration.
.
Failure to adhere to the guidelines below can result in severe personal injury, death or substantial property damage.
o
F.
Apply the following suggestions to prevent unsatisfactory operation of the furnace.
15. Inspect, clean and replace (if necessary) return air filter
regularly.
16. Do not obstruct return air grills or supply air outlets.
17. Supply only #2 fuel oil to the burner. Never attempt to use
gasoline, a mixture of gasoline and oil, waste fuel, refuse or any
other substance in the burner of furnace.
Installation -
18. Do not block flow of combustion or ventilation air to furnace. Do
not block or obstruct the air openings in the furnace casing.
19. Connect furnace only to a functional vent system in good
condition. Place the furnace to allow proper venting, with the
shortest possible venting and minimum number or elbows.
20. Always connect and seal a return air duct to the furnace unless
the furnace is located in a large space, such as an unpartitioned
basement, Route the return air duct to an adjacent room if no
return air manifold is used.
21. Install furnace maintaining minimum clearances for service and
separation from combustible surfaces described in this manual.
If furnace is installed on a combustible floor, you must use the
combustible floor base or provide the minimum clearance from
the furnace to the floor as given in this manual.
22. Install, start-up, service and maintain burner per instructions in
this manual and the burner manual.
23. Verify burner is properly inserted through the combustion
chamber opening.
24. Furnace must be installed so that burner and control system
components are protected from dripping, spraying water or rain
during operation or service.
25. If installing an air conditioning evaporator coil, install the coil
downstream of, or in parallel with, the furnace to prevent
condensation on the furnace heat exchanger. If the coil is in
parallel, provide means to prevent flow of chilled air into the
furnace, including an interlock to prevent simultaneous operation
of heating and air conditioning.
3. Avoid locating return grills in rooms that may contain undesirable
odors.
4. Never locate a return air grill closer than approximately 20 feet
from the furnace.
5. Locate the furnace near the center of the supply and return duct
systems.
6. Always check the size of the ducts on a replacement installation,
particularly if adding air conditioning.
2 670-000-005/1010
THB & TLB Oil Furnaces – Furnace Manual
1 Prepare furnace location
Pre-installation checklist
Verify code compliance
Local, state, provincial, and national codes, laws, regulations
and ordinances
NFPA-31, Installation of Oil-Burning Equipment
National Electrical Code
All local codes and/or regulations take precedence over the
instructions in this manual and should be followed accordingly.
THB & TLB furnaces, their burners and controls met
safe lighting and other performance criteria when
furnace underwent tests specified in Underwriters
Laboratories Standard UL727.
Check location and furnace specifications
Furnace heating capacity
Space is large enough to provide required clearances
Verify the installation will meet the requirements of this manual:
Clearances (page 3)
Combustion/ventilation air openings (page 4)
Supply air duct (page 8)
Return air duct (page 8)
Vent system (page 11)
Fuel oil piping (page 12 plus burner manual)
Electrical connection (page 12)
Clearances
Minimum clearance to combustible materials
1. Install the furnac e, ductwork and vent such that no combustible
surface is closer than listed in Table 1.
Table 1 Minimum clearances
Minimum clearances from furnace, ductwork and vent
Flue pipe clearances must take precedence over
jacket clearances (listed below).
Service accessibility clearances
1. Provide no less than the minimum clearances given in Table 1 to
ensure the furnace can be properly operated, serviced and
maintained.
Always apply whichever clearance is LARGER – combustible
construction or service accessibility.
Flooring and foundation
Flooring
THB & TLB furnaces are approved for installation on combustible
flooring, but must never be installed on carpeting.
Do not install furnace on carpeting even if foundation
is used. Fire can result, causing severe personal
injury, death or substantial property damage.
Foundation
1. Provide a solid brick or minimum 2-inch concrete foundation pad
if any of the following is true:
• The floor can become flooded.
• The furnace mounting area is not level.
Residential garage installations
Take the following special precautions when installing the furnace in
a residential garage. Il the furnace is located in a residential garage:
• Mount the furnace a minimum of 18 inches above the floor
of the garage.
• Locate or protect the furnace so it cannot be damaged by a
moving vehicle.
Servic e acces s ibilit y clearance s are recom m ended
minim um dim ensions to allow ac c es s to furn ace
components (motor, blower, filters, etc.).
Top of plenum t o ce iling 1" 1"
Above warm air duct within 6 fee t of furna ce 1" 1"
Front of furn ace 1 8" (alc ov e) 18" 18" (alc ov e) 18"
Flue pipe (or bar om et ric d. c.) to any surfac e 9" (note 1) 18" 9" (not e 1) 18"
Rea r of furnace 0" 0"
Side of furnace 0" 0"
Warm air plenum t o wall 1" 1"
Combustible floor 0" 0"
Note 1 : Single wall metal vent (or barometric draft control) can be no closer than 9 inches to any combustible surfac e. Apply requirement s of NFPA 31
an d local codes to red uce c l earance using dou bl e-wall vent pi pe and/or pro tectiv e i nsulati on be twee n the flue pi pe or barometric draft control and
combustible surfa ces. Minimum clearance when u sing Type L double-wall vent pipe is 6”.
670-000-005/1010 3
TH B Furnaces TL B Furnac e s
To combust i ble
construction
For serv ice
accessibility
To combustible
construction
For serv ice
accessibility
THB & TLB Oil Furnaces – Furnace Manual
1 Prepare furnace location (continued)
Air for combustion and ventilation
Adequate combustion and ventilation air ensures
proper combustion and reduces risk of severe
personal injury or death from possible flue gas
leakage and carbon monoxide emissions.
Do not install exhaust fan in furnace room.
Consider building construction
Older buildings with single-pane windows, minimal weatherstripping and no vapor barrier often provide enough natural
infiltration and ventilation without dedicated openings.
New construction or remodeled buildings are most often built
tighter. Windows and doors are weather-stripped, vapor barriers
are used and openings in walls are caulked. As a result, such
tight construction is unlikely to allow proper natural air infiltration
and ventilation.
For buildings with tight construction, provide openings directly to
outside or to a ventilated crawl space or attic. Size the openings
to the same specifications as for the furnace location per the
following paragraphs.
Follow state, provincial or local codes when sizing adequate
combustion and ventilation air openings. In absence of codes,
use the following guidelines when furnace is in a confined room
(defined by NFPA 31 as less than 7,200 cubic feet per 1 GPH
input of all appliances in area. A room 8 ft. high x 30.0 ft. x 30.0 ft.
is 7200 cu. ft.).
Provide two permanent openings:
Opening locations
One within 12 inches of ceiling, one within 12 inches of floor.
Minimum height or width dimension of each rectangular opening
should be at least 3 inches.
When inside air is used:
Each opening must freely connect with areas having adequate
infiltration from outside. Each opening should be at least 140 sq.
in. per 1 GPH input (1 sq. in. per 1000 BTU input) of all fuelburning appliances plus requirements for any equipment that can
pull air from room (including clothes dryer and fireplace).
When outside air is used
Connect each opening directly, by way of ducts to the outdoors,
or to crawl or attic space that freely connects with outdoors. Size
per below:
• Throug h outside wall or vertical ducts – at least 35 sq. in. per
1 GPH input (1sq. in. per 4,000 BTU input) of all fuel burning
appliances plus requirements for any equipment that can pull
air from room (including clothes dryer and fireplace).
• Through horizontal ducts – at least 70 sq. in. per 1 GPH
furnace input (1 sq. in. per 2,000 BTU input) of all fuelburning appliances plus requirements for any equipment that
can pull air from room (including clothes dryer and fireplace).
• Where ducts are used, they should have the same crosssectional area as free area of openings to which they
connect. Compensate for louver, grille or screen blockage
when calculating free air openings. Refer to their
manufacturer’s instructions for details. If unknown, use:
• Wood louvers, which provide 20-25 % free air.
• Metal louvers or grilles, which provide 60-75 % free air.
Lock louvers in open position or interlock with equipment to
prove open before furnace operation.
Basement installations
When the furnace is located in an unconfined space, such as an
unpartitioned basement, adequate air should normally be
available without additional opening. An unconfined space is
defined as one having no less than 50 cubic feet room volume
per 1,000 BTU input of all appliances in the space.
If the house is of tight construction, provide air openings to the
basement directly from outside or from a ventilated attic. Size the
openings as described above under “When outside air is used”.
Closet installations – special NOTICE
Openings in closet doors
Provide TWO openings – one within 6 inches of top of closet
door, the other within 6 inches of the bottom of closet door.
EACH opening must be at least 24 inches wide by 12 inches
high.
Advise homeowner that the openings to the
closet must never be obstructed or blocked in any
way. Failure to provide adequate air for
combustion and ventilation could result in severe
personal injury, death or substantial property
damage.
4 670-000-005/1010
THB & TLB Oil Furnaces – Furnace Manual
1 Prepare furnace location (continued)
Air contamination
Please review the following information on potential combustion air
contamination problems.
See Table 2 for products and areas which may cause contaminated
combustion air.
To prevent potential of severe personal injury or
death, check for products or areas listed below
before installing furnace. If any of these
contaminants are found:
• Remove contaminants permanently.
-OR-
• Isolate furnace and provide outside combustion air. See
national, provincial or local codes for further information.
Table 2 Corrosive contaminants and likely locations
Products to avoid
Spray cans containing chloro/fluorocarbons
Permanent wave solutions
Chlorinated waxes/cleaners
Chlorine-based swimming pool chemicals
Calcium chloride used for thawing
Sodium chloride used for water softening
Refrigerant leaks
Paint varnish remov ers
Hydrochloric acid/muriatic acid
Cements and glues
Antistatic fabric softeners used in clothes dryers
Chlorine-type bleaches, detergents, a nd cleaning solvents found in
household laundry rooms
Adhesives used to fasten building products and othe r similar
products
Areas likely to have contaminants
Dry cleaning/laundry areas and establishments
Swimming pools
Metal fabrication plants
Beauty shops
Refrigeration repair shops
Photo processing plants
Auto body shops
Plastic manufacturing plants
Furniture refinishing areas and establishments
New building construction
Remodeling areas
Garages with workshops
670-000-005/1010 5
THB & TLB Oil Furnaces – Furnace Manual
2 Prepare furnace and place in position
Inspect & prepare furnace
Remove furnace from carton
Remove the furnace from its shipping carton and inspect thoroughly.
Remove access panels to inspect the furnace interior.
Immediately file a claim with the transportation
company if you discover concealed damage.
Do not install or attempt to operate the furnace if the
heat exchanger, burner or controls have been
damaged. Immediately contact your furnace
supplier. Operating a damaged furnace could result
in severe personal injury, death or substantial
property damage.
Prepare furnace (THB models)
THB furnaces require cutting the return air opening into one side of
the furnace. Carefully cut the opening on the correct side of the
furnace, using the four knockouts on the side as guide.
Prepare burner
Remove the burner from its shipping carton and inspect thoroughly.
Read the burner manual and follow instructions for preparing and
installing the burner.
Install the correct nozzle for the required firing rate, using the burner
manual and the information in Section 12 of this manual. Follow the
burner manual’s instructions for nozzle installation. Verify the correct
settings of electrodes after nozzle and burner oil tube assembly are
in place.
Openings in walls, floor & ceiling
General
Ensure that the finished door opening to the furnace room is large
enough to install and remove the furnace, water heater or any other
appliances in the room.
Before placing furnace in a closet or small room, cut all openings
required in floor, ceiling or walls for ducts and vent. This will simplify
the work and prevent construction dust from entering the furnace
heat exchanger.
Verify that all clearances to combustible construction
and as needed for service accessibility will be met.
The vent must be no closer than 18 inches to any
combustible surface unless using type L double-wall
vent pipe or constructed per the requirements of
NFPA31. Provide ventilated thimble per all
applicable codes where vent pipe passes through
wall or ceiling. Failure to comply could result in
severe personal injury, death or substantial property
damage.
Openings …
Return air duct
You must install a return air duct, sealed to the furnace, even if no
return manifold is used. The only exception is when the furnace is
located in a large unpartitioned room, such as a basement. (A room
whose volume is at least 50 cubic feet per 1,000 BTU/h input of all
appliances in the room is considered large). For large rooms, return
air may be taken directly at the furnace, without a return air duct. No
return air register should be within 20 feet of the furnace.
Cut the required opening for the return air duct in the wall (or floor or
ceiling) of the room before placing the furnace.
Install filter
Install return air filter of the size listed in Section 12.
When installing on combustible flooring, provide supply plenum
size and floor opening as given in Table 3.
(continued)
Verify that the filter will be easily accessible for
removal after the furnace is in place.
Install furnace and burner
Place furnace
Place the furnace in the desired location. Measure clearances and
verify per page 3 of this manual.
Level the furnace using a spirit level on the front and one side.
Inspect combustion chamber
Inspect the combustion chamber. Verify it is in good condition and
correctly in position inside the heat exchanger. The burner opening
in the chamber must align with the burner heat exchanger opening.
The combustion chamber is constructed of ceramic
fiber materials See the WARNING information on
page 20 of this manual. Comply with these
instructions when handling any ceramic fiber or
fiberglass materials. Failure to adhere to these
guidelines could result in severe personal injury or
Insert burner
Following the burner manual instructions, install the burner and its
gasket in the burner opening. Make sure the burner passes through
the opening in the combustion chamber and does not protrude more
than ¼ inch into the chamber.
Secure the burner in place with the three nuts and washers
provided. Wire and pipe fuel to the burner per burner manual and
this manual.
death.
Duct locations and sizing
Verify the size of the supply and return duct system is sufficient for
the application. The pressure drop through the duct system must not
exceed 0.25 inches water column. The total drop through the duct
system and air conditioning condensing coil (if used) must not
exceed 0.5 inches water column.
See suggested duct sizing in this manual. For more detailed sizing
information refer to ACCA Manual D.
6 670-000-005/1010
THB & TLB Oil Furnaces – Furnace Manual
2 Prepare furnace and place in position
Blocked Vent Shut-Off (BVSO) for chimney venting
(OPTIONAL)
It is imperative that this device be installed by a
qualified agency.
This device is designed to detect the insufficient evacuation of
combustion gases in the event of a vent blockage. In such a case
the thermal switch will shut down the oil burner. The device will then
need to be re-armed MANUALLY.
In the event that the BVSO repetitively shuts down the oil burner, a
qualified technician needs to evaluate the cause of this shut down.
Refer to the figures 3 to 5 at section 6, Wiring Diagrams and detailed
instructions supplied with the BVSO for the installation and wiring
procedures.
It is also essential the the BVSO be maintained annually.
For more details refer to the instructions supplied with the device
itself, as well as the Maintenance Section.
Figure 1
Blocked Vent Shutt-Off device wiring
Installation : Upflow with Vertical exhaust
(Optional)
Figure 2
Blocked Vent Shutt-Off device wiring
Installation : Upflow with Horizontal exhaust
(Optional)
670-000-005/1010 7
THB & TLB Oil Furnaces – Furnace Manual
3 Connect supply and return ducts
Duct sizing
Determine air flow CFM
The temperature rise through the furnace must not exceed 85o F and
should be at least 55
assume a temperature rise of 70
The sensible heat temperature change for cooling would be
approximately 27-30
approximately 18-21
To calculate the sensible heat temperature change (ΔT), you can
use the formula:
ΔT = BTU/h/(1.1 x CFM) Eq. 3-1
To calculate air flow when you know temperature change (ΔT), you
can use:
CFM = BTU/h/(1.1 x ΔT) Eq. 3-2
You can estimate air flow using the following rules of thumb:
Heating: 14 CFM per 1,000 BTU/h output Eq. 3-3
Cooling: 400 CFM per ton air conditioning Eq. 3-4
Determine the required air flow based on whichever is larger –
heating mode or air conditioning mode.
Examples:
1. What would the temperature rise be for a 100,000 BTU/h output
furnace with an air flow rate of 1,200 CFM?
Use Equation 3-1 since you know CFM and BTU/h:
ΔT = 100,000/(1.1 x 1200) = 76
• The temperature rise would be 76
• If the air enters the furnace at 70
furnace at 70
2. What would the air flow be to obtain a 70
120,000 BTU/h output furnace?
Use equation 3-2 since you know ΔT and BTU/h:
CFM = 120,000/(1.1 x 70) = 1,558 CFM
• The air flow would have to be 1,558 CFM to obtain a
temperature rise of 70
3. Estimate the required air flow for a 75,000 BTU/h output furnace
installed with a 2-ton air conditioning evaporator coil.
Heating mode air flow (use Equation 3-3):
CFM = 75 x 14 = 1,050 CFM
Cooling mode air flow (use Equation 3-4):
CFM = 2 x 400 = 800 CFM
• The larger number is 1,050 CFM (heating), so the duct
system should be sized for 1,050 CFM.
• The supply duct would need to be 16" round or a rectangular
equivalent such as 8" x 25" or 12" x 16", using Table 4,
page 9.
4. Estimate the required air flow for the same furnace installed with
a 4-ton air conditioning evaporator coil.
Heating mode air flow is still 1,050 CFM.
Cooling mode air flow (use Equation 3-4):
CFM = 4 x 400 = 1,600 CFM
• The larger number is 1,600 CFM (cooling), so the duct
system should be sized for 1,600 CFM.
• The supply duct would need to be 18" round or a rectangular
equivalent such as 8" x 36" or 12" x 21", using Table 4,
page 9.
o
F for comfort. When calculating air flow,
o
F.
o
F. Actual temperature change will be
o
F due to humidity of the air.
o
F
o
F.
o
o
F + 76o F = 146o F.
o
F.
F, it would leave the
o
F rise through a
Always check the size of existing ducts, particularly
if you are adding air conditioning. The air pressure
loss through the cooling evaporator coil reduces
available air flow. If the ducts are too small as well,
the system may not work satisfactorily on either
heating or cooling.
Determine duct dimensions
Table 4, page 9, and Table 5, page 10, provide typical round and
rectangular duct sizes for rectangular and flat oval galvanized ducts.
Do not apply these tables to size ductwork if the total equivalent
length of the duct exceeds approximately 100 feet. For longer
systems or for duct board, fiberglass-lined or flexible duct sizing, use
the ACCA Manual D or the ACCA duct sizing slide rule. These
tables are based on pressure loss of approximately 0.10 inch water
column per 100 feet equivalent length of duct.
Use Table 3 below to size or check sizing of takeoffs to supply
registers or return grills.
Verify the size and type of registers, diffusers and grills from the
manufacturer’s ratings. Do not exceed the recommended flow rate.
The pressure drop allowance for each should not exceed
approximately 0.05 inch water column.
Install a return air filter, sized per specifications on Section 12.
Use only a return air filter mounted to the furnace. Do not add
additional filters unless the duct system is carefully sized to allow for
the additional pressure drop.
Table 3 Suggested maximum flow to takeoffs
TAKE-OFF SIZE
(Inches)
Sheet metal or ductboard
5 Round 60 45
6 Round 100 75
7 Round 140 110
8 Round 210 160
3 ¼ x 8 Stack 70 55
3 ¼ x 10 Stack 100 75
3 ¼ x 14 Stack 140 110
2 ¼ x 12 Stack 70 55
2 ¼ x 14 Stack 90 70
Flexible duct (keep bends to minimum)
6 Round 55 40
8 Round 120 90
10 Round 200 160
12 Round 320 250
14 Round 480 375
16 Round 660 530
18 Round 880 680
20 Round 1200 900
SUPPLY RETURN
CFM
8 670-000-005/1010
THB & TLB Oil Furnaces – Furnace Manual
3 Connect supply and return ducts (continued)
Duct sizing (continued)
Table 4
Typical duct sizing for systems not over 100 feet equivalent length – round or rectangular galvanized
Typical duct sizing
(For approxim ately 0.10 inch w.c. i n a typical residenti al instal lation of galvani z ed metal duc t)
Round
CFM
duct
diameter4567891012141618202224262830
(inches)xxxxxxxxxxxxxxxxx
45
65
100
150
200
250
300
400
500
600
700
800
900
1000
1100
1200
1300
1400
1500
1600
1700
1800
1900
2000
2200
2400
2600
2800
3000
3500
4000
Rectangular duct equival ent sizes
Mini mum wi dt h
4
5
6
7
8
9
9
10
12
12
12
14
14
16
16
16
16
18
18
18
18
18
20
20
20
22
22
22
22
24
26
444-------------6544-------------
865544- - --------1297655544-------141198766544------181310987665544----20151210987665544---2619151311109876655544322318151312119876665555
3828221815131210987766655
46322520171514111098777666
523628231917151311109887766
5841312521191714121110988777
6445342823201815131110998877
72493830252219161412111099887
-5441332724211715131211109988
- 58443529252218161412111010 9 9 8
- 6347383127241916141312111010 9 9
- 685140342925201715141212111010 9
- 725443363027211816141312111110 9
- - 58 45 38 32 28 23 19 17 15 14 13 12 11 10 10
- - 61 48 40 34 29 24 20 17 16 14 13 12 11 11 10
- - 64 51 42 35 31 25 21 18 16 15 14 13 12 11 11
- - 68 53 44 37 32 26 22 19 17 15 14 13 12 12 11
- - - 5948413528232018161514131212
- - - 6452443830252219171615141312
- - - 6956474132272321191716151413
- - - - 61 51 44 34 29 25 22 20 18 17 15 15 14
- - - - 65 54 47 37 30 26 23 21 19 17 16 15 14
-----635442342926232119181716
-----726147393329262321201918
Do not apply this table for duct systems over approximately 100 equivalent feet length. For longer systems or systems using
other duct materials, refer to ACCA Manual D. Incorrectly sizing duct systems can result in unsafe or uncomfortable
operation.
(inches)
for duct heights
(inches)
of :
670-000-005/1010 9
THB & TLB Oil Furnaces – Furnace Manual
3 Connect supply and return ducts (continued)
Duct sizing
Table 5
Typical duct sizing for systems not over 100 feet equivalent length – round or flat oval galvanized
(For approximately 0.10 inch w.c. i n a typical residenti al instal lation of galvani z ed metal duc t)
Round
CFM
45
65
100
150
200
250
300
400
500
600
700
800
900
1000
1100
1200
1300
1400
1500
1600
1700
1800
1900
2000
2200
2400
2600
2800
3000
3500
4000
duct
diameter3456789101214161820
(inches)xxxxxxxxxxxxx
Do not apply this table for duct systems over approximately 100 equivalent feet length. For longer systems or systems using
other duct materials, refer to ACCA Manual D. Incorrectly sizing duct systems can result in unsafe or uncomfortable
operation.
(continued)
4
5
6
7
8
9
9
10
12
12
12
14
14
16
16
16
16
18
18
18
18
18
20
20
20
22
22
22
22
24
26
Typical duct sizing
Flat oval duct equi val ent sizes
Mini mum width
65-----------
86----------1187---------161198--------211511108-------26181411109------302016131110------40262016141211-----4932241916141312----5938282219161513----694432252118161513----
-5036292420181614----
-5641322622201815----
- 634535292422191715 - - -
- 694938312623211816 - - -
- 755341332825221917 - - -
- - 58 44 36 30 26 24 20 18 - - -
- - 62 47 38 32 28 25 21 18 17 - -
- - 66 50 41 34 30 26 22 19 18 - -
- - 71 54 43 36 31 28 23 20 18 - -
- - - 57 46 38 33 29 24 21 19 - -
- - - 60 48 40 35 31 25 22 20 - -
- - - 63 50 42 36 32 26 23 21 19 -
- - - 67 53 44 38 33 27 24 21 20 -
- - - 73 58 48 41 36 29 25 23 21 -
----635244393227242221
----685648423429252322
-----6051443630272423
-----6454473832282624
------63544336322826
------71614840353129
(inches)
for duct heights
(inches)
of :
10 670-000-005/1010
THB & TLB Oil Furnaces – Furnace Manual
4 Venting
General venting requirements
Failure to follow all instructions can result in flue gas
spillage and carbon monoxide emissions, causing
severe personal injury or death.
Inspect existing chimney before installing furnace.
Clean chimney thoroughly. Replace or repair
chimney if visual inspection indicates chimney may
be unsuitable for use. Insufficient draft can cause
flue gas leakage and carbon monoxide emissions.
Failure to clean or replace perforated pipe or tile
lining and/or patch mortar and joints can cause
severe personal injury or death.
• THB and TLB furnaces are designed to operate with an over-fire
draft of -0.01" to –0.02" w.c. Proper draft for these oil furnaces
may be achieved using either a conventional chimney (natural
draft) or a power vent (sidewall) system that has been properly
designed for use with oil equipment. Power vent manufacturer’s
instructions must be followed.
• Use vent material approved by local codes for oil-fired burners.
In their absence, refer to:
• NFPA 31, Installation of Oil-Burning Equipment.
• NFPA211, Standard for Chimneys, Fireplaces, Vents and
Solid Fuel Burning Appliances.
• In Canada, refer to CSA B139, Installation Code for Oil-
Burning Equipment.
• NFPA-211 requires chimney to be lined before being
connected to furnace.
• To prevent downdrafts, extend chimney at least 3 feet above
highest point where it passes through roof and 2 feet higher than
any portion of building within 10 feet. Increase chimney crosssectional area and height at least 4% per 1,000 feet above sea
level.
• Provide minimum clearances from vent (flue) pipe to
combustible material:
• Single-wall vent – 18 inches minimum
• Type "L" double-wall vent – 6 inches minimum
• Provide a chimney no smaller than that listed in Table 6.
Oversized chimneys, outside masonry chimneys
and/or de-rated inputs can result in condensation in
chimney.
Connect venting
Long horizontal vent runs, excessive number of tees
and elbows, or other obstructions restricting
combustion gas flow can result in the possibility of
condensation, flue gas leakage and carbon
monoxide emissions, which can lead to severe
personal injury or death.
1. The horizontal vent must slope upwards, away from the furnace,
a minimum of ¼ inch per foot.
2. Connect full-sized venting when possible. See Table 6.
3. Connection must be made above bottom of chimney to avoid
blockage. Vent pipe must not enter chimney far enough to cause
obstruction. Use thimble or slip joint where vent pipe enters
chimney to allow removal for cleaning.
4. When burner and furnace are properly installed, draft overfire
will be approximately –0.01" to –0.02" w.c. Install barometric
Connect venting (continued)
control in vent, per control manufacturer’s instructions, when
excess draft needs to be relieved or to comply with applicable
codes and regulations. Use draft gauge to adjust proper
opening.
5. An induced draft fan for the chimney may be necessary if:
• Excessive resistance to flow of combustion gases can be
expected.
• Cross-sectional area of chimney is smaller than minimum
recommended.
• Chimney height is less than recommended.
• When using induced draft fan, seal all vent joints and
interlock burner with fan operation.
Table 6 Minimum chimney/vent size
Furnace
Model
number
THB/TLB-105 6 “ 6 “ x 6” 6 “ 15’
Minimum
vent
diameter
Minimum chimney
size
Rectangular
(minimum inside
dimensions)
Round
Minimum
Chimney
height
Vent dampers
Do not install a thermal-type vent damper on this
furnace. Failure to comply could result in severe
personal injury, death or substantial property
damage.
If vent damper is required, use only a motorized vent
damper, installed and wired to the furnace following
the vent damper manufacturer’s instructions.
Barometric draft control
Install barometric control in vent, per control manufacturer’s
instructions, when excess draft needs to be relieved or to comply
with applicable codes and regulations. Use draft gauge to adjust
proper opening.
1. Install barometric draft control in vent pipe at least one foot from
the furnace vent connection, preferably in the highest part of the
vent pipe before the vent enters the chimney. If headroom
doesn’t provide enough clearance to locate the control at least
one foot from the vent connection, install an elbow at the furnace
and mount the control in a horizontal pipe at least one foot from
the elbow. Install an elbow after the control to turn vertically.
2. To operate correctly, the barometric draft control must be
located in the same room as the furnace.
3. Ensure the barometric draft control is accessible. Adjust the
damper to obtain the correct overfire draft, as described in this
manual and the burner manual.
670-000-005/1010 11
Loading...