SCOTSMAN
WOOD FURNACE
Model DB-101
OWNER’S MANUAL
IMPORTANT
READ OWNER’S MANUAL THOROUGHLY BEFORE
INSTALLING FURNACE OR LIGHTING FIRE.
CONSULT LOCAL AUTHORITIES IF IN DOUBT
ABOUT YOUR LOCAL FIRE SAFETY REGULATIONS.
ALL INSTALLATIONS MUST BE MADE IN
ACCORDANCE WITH LOCAL AND STATE OR
PROVINCIAL CODES WHICH MAY DIFFER FROM
THIS MANUAL.
IMPROPER INSTALLATION WILL RESULT IN
VOIDING OF WARRANTY.
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SCOTSMAN WOOD FURNACE – INSTRUCTION MANUAL
KERR SCOTSMAN Wood Furnace
Model DB-101-ADD
Tested and Listed by: Energy Testing Laboratory of Maine
Certified by the Canadian Standards Association (CSA) Sept. 1981
COSP No. WCP 001 – Free-Standing
COSP No. WCP 005 – Add-On
Manufactured by: Parrsboro Metal Fabricators Ltd.
P.O. Box 637, Crossroads
12118 Highway 209
Parrsboro Nova Scotia, Canada
B0M 1S0
SPECIFICATIONS
Length
39”
Width
29”
Height
44 1/2”
Shipping Weight
Fire Box 1/8”plate Length
Diameter
392 lb.
36”
23”
Secondary Heat Exchanger
14 gauge steel
13” x 13”
32 1/4” x 25 1/2”
N/A
20” x 20”
G9 – 10
Fire Box Door
Warm Air Plenum
Return Air Plenum
Air Filter Size
Blower Size
Cast Iron
Blower Motor
C.F.M.
Smoke Pipe
Floor to smoke pipe center
Output (max)
Fuel
1/4 hp
1000 (Required)
7” Inside Diameter
38 3/4”
140,000 Btu/h
Wood 30” logs
Volts 120, Cycles 60, Amps 15
Electrical Rating
NOTE – Keep this manual in a safe place for future reference. Follow manual carefully
for the correct way to install and operate this unit.
CAUTION – Do not fire this unit until operating instructions have been read and fully
understood.
INSTALL WOOD FURNACE ONLY ON A FURNACE DUCT SYSTEM
AND CHIMNEY THAT ARE IN GOOD CONDITION.
SAVE THESE INSTRUCTIONS
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SCOTSMAN WOOD FURNACE – INSTRUCTION MANUAL
1.0 OPERATING INSTRUCTIONS
1.1 INTRODUCTION
Congratulations on your purchase of the KERR SCOTSMAN Wood Furnace.
Developed in Atlantic Canada, this KERR Furnace has been designed to allow you to
heat your home with wood, one of North America’s most abundant fuels. Designed with
you in mind, the KERR SCOTSMAN Wood Furnace will provide you with many years of
safe, efficient central heating.
To ensure you have a clear understanding of the operating procedures of this furnace,
please take the time to read the remainder of this section on operating procedures. If
you have any questions, your KERR DEALER will be happy to answer them for you.
1.2 WOOD-BURNING
The SCOTSMAN Wood Furnace will burn most wood fuels, however it is recommended
that only dry, seasoned hardwood be used as much as possible since it affords cleaner,
safer and more efficient operation. Burning seasoned hardwood will leave less ash,
soot and creosote residue and will require fueling less often. Use smaller loads of wood
on warmer days.
WARNING: DO NOT use chemicals or fluids to start the fire or during operation.
DO NOT burn driftwood or manufactured logs (compressed wood).
Before adding fuel to an existing fire turn up the thermostat for about five minutes or lift
damper chain to hold damper fully open for about one minute before opening the
loading door. This action will allow residual smoke to clear from the combustion
chamber and reduce smoke entering the basement during refueling.
Twice daily refueling may be sufficient in modern well-insulated homes. However,
KERR recommends that small fuel loads be added morning, noon and early evening
and late evening, rather than large quantities infrequently. A small intense fire will burn
more efficiently than a large smoldering fire in the SCOTSMAN Wood Furnace and will
produce less creosote.
When refueling the SCOTSMAN, the remaining coals should be raked to the front of the
combustion chamber before adding any new fuel. Place the fresh supply of wood to the
rear of the combustion chamber. This gives more of an even cigar type fuel burn, rather
than a large hot fire to a slow amber fire. This will help create a more even and efficient
burn. The SCOTSMAN owner should attempt to gauge fuel quantities with outdoor
temperatures; a little practice will provide greater satisfaction and efficiency.
WARNING: This furnace is not to be used with an automatic stoker.
Keep firing door tightly closed and maintain door seal in good condition.
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SCOTSMAN WOOD FURNACE – INSTRUCTION MANUAL
CREOSOTE
Wood combustion is never 100% complete. Wood smoke always contains some
unburned gases and a mixture of unburned tar-like liquids. A percentage of these
materials will condense out on any cool surface, leaving a dark brown or black
substance with an unpleasant acrid odor. This substance is commonly called creosote.
If these wood gases condense out on cool surfaces such as a cold chimney or a long
smoke pipe, they retain large amounts of water and will be very fluid. At higher
temperatures the condensed creosote will resemble tar (thick and tacky).
Creosote generation is highest during low heat outputs common with long smoldering
burns. Creosote generation is lowest during high heat outputs common with intense
fires. It is recommended that a small intense fire be used for best results against
creosote build up even though the wood furnace will require refueling more often.
Creosote generation is also higher when burning green wood. The moisture in the
green wood absorbs the heat from the fire, cooling the fire below the point at which the
creosote can be consumed. The low temperature smoke is then further cooled in the
upper furnace chambers; smoke pipe and chimney allowing large amounts of creosote
to form.
To reduce creosote build-up during periods of low heat requirements (i.e. Spring and
Fall) it is recommended to fuel the wood furnace with smaller quantities of smaller
diameter logs. Matching fuel loads and heat requirements will result in cleaner
combustion and higher efficiency.
IN CASE A SERIOUS CREOSOTE FIRE BEGINS:
o Close the damper door by disconnecting chain.
o Close all draft regulators.
o Throw 1/2 lb. of coarse or table salt on the fire and close door immediately.
o Call the FIRE DEPARTMENT at once!
Have a firmly established Emergency Procedure in place for the handling of a flue fire.
1.3 STORAGE OF WOOD
Once cut, green wood dries (or seasons), quickly at first and then at a slower and
slower rate. When the wood has been cut to the proper length and split, it should be
piled outside during the summer months. Place two poles on the ground to serve as
rails to keep the firewood off the moist ground. Stack the wood so that both ends of the
logs are exposed to the air if space is available, since more drying occurs through the
cut ends than through the sides. This is true even with wood that has been split. The
woodpile should be under cover so that it will not absorb moisture from the rain and
snow before it is used, but still open on the sides and ends to the drying effect of the
wind and sun. Store wood in neat, well-supported piles.
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SCOTSMAN WOOD FURNACE – INSTRUCTION MANUAL
1.4 MAXIMUM SOLID-FUEL CHARGE
The maximum level for a solid-fuel charge is the middle of the loading door, or the level
of the handle. DO NOT OVERFILL. The KERR SCOTSMAN Wood Furnace will accept
whole or split logs up to 34 in. (865 mm) long, but a 30 in. (765 mm) log length is
recommended for convenience and ease in handling.
Maximum damper gate opening is 11/16”. Do not tamper or adjust to greater opening in
an attempt to increase fire or over-firing and hazard may result.
1.5 MAINTENANCE
Some regular maintenance is necessary on the KERR SCOTSMAN furnace. A good
practice is to establish a routine for the storage of fuel, care of the appliance, and firing
techniques.
1.5.1 CLEANING (Fig S101-10)
The KERR SCOTSMAN Wood Furnace must be cleaned regularly to maintain top
efficiency. The furnace needs cleaning more often when burning green wood, or during
long periods of low fire. When the KERR SCOTSMAN Wood Furnace is first installed
the furnace heat exchanger should be checked visually from the firebox and smoke pipe
hole every week to determine the rate at which creosote or ash is accumulating within
the furnace. Cleaning should be done whenever there is more than 1/4 inch of build-up
on the heat exchanger or 3 inches of ash in the base. If the wood furnace is to be left
unused for an extended period of time (more than one month) then the appliance should
be cleaned of all ash and residual left from the burning of wood.
CLEANING PROCEDURE
o Make sure fire is completely out and the furnace has cooled.
o Remove the cleanout cover, located on the rear of the furnace heat exchanger, the
smoke pipe, and internal breech baffle.
o The heat exchanger is now accessible for cleaning.
o Use the scraper provided to remove all soot and ash from the furnace heat
exchanger and exposed surfaces.
o Scrape all residues in the top heat exchanger towards the rear of the furnace
where it will fall into the firebox.
o Always check flue pipe for creosote or ash build-up in the pipe and clean if
necessary.
o Reinstall cleanout cover, internal breech baffle (See section 2.4.2) and smoke pipe
making sure that all joints are secured with at least 3 sheet metal screws.
o Check chimney cleanout for ash build-up and remove any accumulation.
o Residue may be removed from the firebox or left to be burnt during the next fire. It
is good practice to leave a layer of ash approximately one inch deep in the base of
the firebox.
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SCOTSMAN WOOD FURNACE – INSTRUCTION MANUAL
DISPOSAL OF ASHES
Ashes should be placed in a metal container with a tight fitting lid. The closed container
of ashes should be placed on a non-combustible floor or on the ground, well away from
all combustible materials, pending final disposal. If the ashes are disposed of by burial
in soil or otherwise locally dispersed, they should be retained in the closed container
until all cinders have thoroughly cooled.
WARNING – Ashes usually contain live dormant coals, which may burn for many hours
after a recognizable flame has disappeared. Use extreme caution when handling and
disposing ashes.
IMPORTANT – No other waste shall be placed in this container.
1.5.2 SERVICING
The furnace air filter must be checked monthly and replaced each year. Annually
lubricate the blower motor, if it is not permanently lubricated, with 4-6 drops of SAE-30
oil in each bearing.
CAUTION: Failure to keep air filter clean will result in poor furnace performance and
possible damage to wood furnace heat exchanger.
1.6 SAFETY
If the furnace overheats due to improper operation the following precautions should be
taken:
DO NOT shut off power. The blower must be kept running to disperse excessive heat.
Manually close the damper door by unhooking the chain. Check controls for proper
operation before starting a new fire.
WARNING – The maximum opening of the combustion air damper is preset at the
factory. DO NOT adjust the stop or attempt to increase the combustion air by any
means.
1.7 CONTROLS
Thermostat
The primary control is the room thermostat located near the center of the house on the
main floor or near an existing thermostat. The thermostat operates the damper motor to
open and close the damper door thus allowing more or less air into the combustion area
to control the fire.
Fan and Limit
The fan and limit control mounted in the plenum controls the operation of the circulating
blower and prevents the furnace from over-heating. When the air temperature in the
plenum reaches the “ON” set point of the fan switch (usually 140º F (60º C)) the blower
starts and runs until the plenum cools to the “OFF” set point (usually 100º F (38º C))
when the blower is switched off. The limit function in this control is usually set at (280º
F (138º C)) and will override the room thermostat to close the damper door if the
furnace overheats, and will also prevent the oil furnace from starting.
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SCOTSMAN WOOD FURNACE – INSTRUCTION MANUAL
1.8 ELECTRICAL POWER FAILURE (Fig S101-3)
If no one is home during a power failure, the damper will automatically close and some
gravity heating will take place. Combustion air will continue to enter through the
secondary air holes and a fire should be maintained.
IMPORTANT – This furnace is CSA certified for operation under Power Failure only if
optional gravity air inlet kit is installed.
For optimum heating during a power failure follow the procedure listed below:
For Power Failure operation remove the power failure gravity air inlet cover before
starting or refueling during power failure. The cover is an option available from your
KERR dealer. The kit must be installed on the cabinet side directly opposite to the entry
of the blower or oil furnace “S” connection ductwork.
Manually open the blower compartment access door of wood or connected oil furnace
to allow gravity flowing air to all areas. (Check with your installer).
Place a coin under the damper flap in such a way that it will fall clear when power is
restored.
Maintain a careful watch on the furnace temperature. If it should exceed 200º F (95º C)
close the damper door.
Do not leave the furnace unattended in this position.
Refuel frequently with small loads to maintain a small fire at ½ normal maximum
volume.
Do not expect to maintain maximum comfort under no power conditions.
Do not allow anyone who is unfamiliar with the operation of the furnace to attend it
during a power failure.
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SCOTSMAN WOOD FURNACE – INSTRUCTION MANUAL
1.9 HOMEOWNER CHECKLIST
o Keep area around unit clean and clear of combustibles.
o Use only dry wood. DO NOT burn garbage, gasoline or naphtha.
o Load carefully.
o Remove ashes as directed.
o Watch for soot build up in smoke pipe – clean regularly.
o Clean furnace heat exchanger regularly.
o Be aware of danger due to over firing unit.
o Do not load above maximum loading level (middle of loading door) or overheating
may result.
o This unit is NOT suitable for automatic stoking.
o Load carefully. Do not slam fuel against rear or sides of firebox. This may damage
the firebox.
o Always observe the following minimum clearances to combustible materials –
Front 48” (1220 mm); one side 6” (152 mm); opposite side and rear 24” (610 mm);
and flue pipe 18” (465 mm).
o Do not store solid fuel within the above clearances or within the space required for
charging and ash removal.
o Establish a routine for storage of fuel, care of the appliance, and firing techniques.
2.0 INSTALLATION INSTRUCTIONS
2.1 INTRODUCTION TO INSTALLERS
Before installing this KERR SCOTSMAN Wood Furnace, please read the following
instruction manual carefully. This unit is designed to be a freestanding or add-on
central heating furnace to provide complete central heating in medium sized well-
insulated homes. Before installing be sure unit is properly sized for the intended
application. Warranty does not cover misapplication of unit.
Applicable Standards
The KERR SCOTSMAN Wood Furnace must be installed in accordance with the
requirements of the National Fire Protection Association codes, the Canadian Heating,
Ventilation and Air Conditioning Code, The National Board of Fire Underwriters, and the
CSA Standards for solid fuel burning equipment as outlined in B365-01. In all cases
consult your local authorities and fire insurance company for specific regulations.
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SCOTSMAN WOOD FURNACE – INSTRUCTION MANUAL
2.2 UNCRATING
When you receive your KERR SCOTSMAN Wood Furnace, check it carefully to ensure
that all components are present and in good condition. If there has been any damage
or loss in transportation, please notify the carrier and retailer at once. Inspect for the
following:
o Firebox/Heat exchanger
o Poker/coals rake
o Marking template (return air and power failure bypass inlet)
o Internal Breech Baffle (Scotsman only)
o For free-standing model optional equipment required:
a) BC-9 Blower Kit (Scotsman only)
b) Control Kit “B” (Scotsman only)
CONTROL KIT A (Oil add-on), B (free-standing with BC–9 blower) or E (Electric add-
on) selected according to installation, which includes:
o L4064R Fan and Limit Control
o Control Mounting Plate
o Damper Motor
o Thermostat (T822D or equivalent)
o Wiring Harness and Parts
o Switching Relay R8405C (8A05A – 4) – Kit “A” & “E” only
o Transformer
– Kit “B” only
NOTE: Some parts may be packed inside furnace firebox. Check shipment carefully
before assuming shortage.
2.3 LOCATING THE FURNACE (Fig S101-1, Fig S101-4)
The location of the furnace must be as close as possible to the tile-lined brick chimney,
or factory-built solid-fuel approved chimney (ULC S629). Keep in mind also the day-to-
day operation, and place for ease of fueling and cleaning. KERR recommends
installation if possible, in a central location in relation to the outlet registers and the use
of large warm air ducts to improve heat distribution during a power failure.
It is important to provide adequate combustion air to the furnace. It may be necessary
to add a ventilator to an exterior wall of a closed furnace room or an airtight basement.
The furnace must be installed so that the clearances as shown in Fig S101-1, or those
of local authorities are met. If the furnace must be installed on a combustible floor, a
non-combustible base must be built as shown in Fig S101-4. Two layers of hollow
masonry block (4” thick) are placed at right angles to each other so that the ventilation
holes of one layer are opposite to those of the other layer. Also there must be a
minimum of one layer of fireproof board and one layer of 26 gauge galvanized metal
beneath the masonry blocks. This base must extend beyond the furnace to a minimum
distance of 18 in (457 mm) in front and 8 in. (204 mm) on all sides.
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SCOTSMAN WOOD FURNACE – INSTRUCTION MANUAL
2.4.1 COMBUSTION AIR SUPPLY
Air inlets of at least 200 square inches free area (1.5 in2/1000Btu) must be provided to
the room occupied by the wood fired or oil fired furnace. These fresh air inlets must
provide or allow free access of fresh outside air to the furnace. At no time or under any
circumstances can a wood or oil-burning appliance be starved of combustion air.
The appliance must at all times be able to maintain the approved stack draft. The
barometric draft regulator must be installed on the furnace smoke pipe in the same
room or at least in such a way that there is unrestricted free passage of air between the
combustion air inlet to the furnace or burner and the barometric draft regulator.
It is important to provide adequate combustion air to the furnace. It may be necessary
to add a ventilator to an exterior wall of a closed furnace room or an airtight basement.
Operating a wood or oil fired appliance with inadequate combustion air could be
hazardous.
2.4.2 FLUE PIPE & CHIMNEY
The internal breech baffle should be inserted through the breech towards the front of the
furnace until it hits the internal baffle stop. The open slot running the length of the baffle
should be located on the top. This baffle is removed during the cleaning procedure. The
purpose of the baffle is to prevent short-circuiting of the flue gases out through the rear
breech. The flue gases are forced to fully heat the secondary heat exchanger, which will
maintain higher furnace efficiency.
The furnace must be located to meet a minimum venting distance needed between the
furnace and the flue. It should also be ducted so that there are a minimum number of
elbows used. The flue pipe must be installed with a gradual rise of 1/2” or more per foot
from the furnace to the flue.
NEVER ALLOW THE SMOKE PIPE TO RUN DOWNHILL TO THE FLUE!
The smoke pipe and chimney should be at least 7 inches in diameter. The flue pipe or
a chimney may be of different cross-sectional area than that of the appliance smoke
pipe, provided that sufficient draft is available at the appliance. Space must be provided
around the smoke pipe and the back of the furnace to allow easy access for the
purpose of cleaning. Smoke pipes must not be lighter than 24 gauge black steel. All
pipes must be securely fastened with at least 3 sheet metal screws at every joint, and
properly supported.
Always meet or exceed flue pipe clearance specifications - 18” clearance from flue pipe
to combustibles in all directions.
Connect the furnace only to an approved chimney suitable for solid fuel appliances and
capable of venting the products of combustion. The chimney must be installed with
proper clearances above roof and from adjacent structures and trees. If a masonry
chimney is used it must be in good condition and be equipped with a tile liner. Flue
thimble or flue pipe must not extend into the chimney flue, as it will reduce the draft.
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SCOTSMAN WOOD FURNACE – INSTRUCTION MANUAL
Connect only to a flue or chimney capable of maintaining a negative draft of .05” wc at
all times and conditions.
WARNING: If this setting is exceeded it could cause a solid fuel fire to burn out of
control.
We recommend that the KERR SCOTSMAN Wood Furnace be connected to its own
chimney. However, two or more fuel fired appliances, other than fireplaces or
incinerators, may be connected to the same chimney.
The National Standard of Canada, Installation Code for Solid Fuel Burning Appliances
and Equipment, CSA-B365-01 clause 5.2.9 states that:
Two or more appliances shall not be connected to the same chimney flue unless:
1) The appliances are located on the same story;
2) A negative pressure is maintained at the flue collar of each appliance;
3) Each appliance is provided with a means to control the rate of flow of air or flue
gases through the appliance combustion and heat exchanger chambers. Where
limitations on flue pressure (draft) are contained in the manufacturer’s instructions,
such means shall be capable of maintaining at the flue collar, the pressure
specified by the appliance manufacture; NOTE: For the purpose of this Clause,
draft controls include ash pit air control dampers, dampers or draft slides wherever
located, over fire and flue key pipe dampers, and check draft controls located on or
in the flue pipe.
4) The flue pipes of the appliances are connected to a manifold as close to the
chimney as practicable or directly to the chimney in the following order:
(i) If only solid fuel is used, the flue pipe from the smallest appliance shall be on
top (downstream);
(ii) If different fuels are used as permitted in Clause 5.2.7, the oil flue pipe shall be
on top (downstream); and the solid fuel flue pipe on the bottom (upstream); and
5) The chimney flue is capable of venting the flue gas by natural draft when all
appliances not interlocked to prevent simultaneous firing are firing at their
maximum rate at the same time.
When installing a wood-burning appliance to an existing chimney carefully inspect entire
chimney for the presence of old inlet holes, which may be improperly covered by metal
caps or other unacceptable means. Fill any openings with brick and mortar to ensure
no hazardous openings exist.
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SCOTSMAN WOOD FURNACE – INSTRUCTION MANUAL
2.5 CLEARANCES (Fig S101-1)
The KERR SCOTSMAN Wood Furnace is to be installed in accordance with National
Building Code or local regulations. Allowances front and rear must be made for
cleaning and servicing.
NOTE: Regardless of minimum clearances to combustibles for safety reasons, a
minimum clearance of 30 in. (765 mm) should be allowed at the furnace rear for
cleaning (due to length of cleaning rake) and access to smoke pipe.
Minimum safety clearances to combustibles are:
Front
Side
48”
6”
24”
24”
1220 mm
152 mm
610 mm
610 mm
457 mm
152 mm
50 mm
Side (for rear access)
Rear (see Note above)
Flue Pipe to combustible, other furnace & electrical wiring 18”
Wood Furnace Above Plenum and 6’(1.8 m) of duct
Supply Duct beyond 6’
Return Duct Plenum and 6’(1.8 m) of duct (Free standing)
6”
2”
3”
76 mm
These clearances will also allow adequate combustion air to reach the furnace.
WARM AIR DUCT & PLENUM CLEARANCES
The following clearances must be observed and must meet all local building, electrical
and fire codes. Follow the National Standard of Canada, Installation Code for Solid
Fuel Burning Appliances and Equipment, CSA-B365-01; the National Board of Fire
Underwriters and in the US the NFPA codes.
The KERR SCOTSMAN Wood Furnace warm air plenum and first 6’ (1.8 m) of warm air
supply duct in any direction must be installed observing a minimum of 6 in (152 mm)
clearance from the joists or combustible materials. Beyond the first 6’ (1.8 m) of supply
duct, a 2” (51 mm) minimum clearance must be maintained between the warm air
supply ducts and all joists or combustible material (See Fig S101-1).
Return air ducts, including main ducts and branch ducts, on solid fuel burning warm air
furnaces shall be installed to provide at least 3” (76 mm) clearance to combustible
construction for the first 6’ (1.8 m) away from the furnace plenum. This requirement is
not intended to apply to return air ducts serving an oil-fired, gas fired or electric
furnace to which an add-on furnace is connected.
It is recommended that a non-combustible rigid board be fastened on the underside of
the floor joists in the area of the ceiling above the furnace, warm air ducts and smoke
pipe.
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SCOTSMAN WOOD FURNACE – INSTRUCTION MANUAL
2.6.1 FREE-STANDING (Fig S101-9)
The KERR SCOTSMAN Wood Furnace in the free standing (stand-alone) system, is the
sole source of central heating using an optional blower box kit to circulate the air. In this
system connect the ductwork, as you would for any conventional warm air heating
system except you use increased clearances. The return air ducts are connected to the
blower box, which may be located on either side of the furnace.
NOTE: With the optional blower, this furnace is not to be connected to ductwork that is
still connected to another furnace.
2.6.2 ADD-ON (Fig S101-7, Fig S101-8)
The KERR Wood Furnace may be installed very satisfactorily in conjunction with
another furnace as tested by ETLM under standard 78-1 and CSA under standard
B365/1981.
In this installation the wood furnace is connected downstream in series with a new or
the existing oil furnace. The blower from the existing furnace provides the air
circulation. The SCOTSMAN may only be added in series downstream from an oil
furnace having an input rating (on original nameplate) of between 0.85 and 1.50 gph
(US) or SI equivalent.
For oil furnaces having multi-speed blowers with continuous circulation
capability.
Add-on furnaces such as the Kerr Scotty SS can be installed with oil fired warm air
furnaces such as the Kerr KD Gemini that have continuous blower circulation capability.
A relay must be used if the furnace is to maintain the continuous circulation feature.
The wiring diagram for this installation is Fig. S101 – 7.
Disconnect Low Speed Circulation Fan Switch if Optional Relay is not used.
Fig S101 - 8.
Disconnecting the circulation fan low speed switch.
If the red wire from the circulation fan switch, in the furnace wiring box, were
disconnected from the yellow wire leading to the blower compartment and both, red and
yellow wires marretted off then there would be no need for the switching relay
(Honeywell R4222D 1013 or equiv.).
In that case the two blue wires would marrette together at location “A” of “Add-On
Wiring” diagram, and provide power to the blower on high speed (black wire). The two
blue wires being 1.) Wood fan “ON” control and, 2.) Oil fan “ON” control.
Also 120 Volts can be fed back through any unused wire from the blower. All unused
wires should be marretted off.
Low Speed Switching Relay (This is an optional part) Fig S101 – 7.
The Honeywell (R4222D 1013 or equiv.) relay is to prevent power from being fed to the
blower motor on two motor windings at the same time.
The red wire from the circulation fan switch (Low Speed) on the oil furnace.
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SCOTSMAN WOOD FURNACE – INSTRUCTION MANUAL
The blue heating wire from the wood fan limit control on high speed.
This relay will disconnect the circulation fan low speed switch and connect the high
speed to the blower motor when there is a call for heat.
Items required:
o Switching Relay R4222D 1013 (120 V Coil, 12 amp @ 120 Vac), or equivalent.
o Junction box (4” x 4”) and cover.
o Square extension box (4”x 4” gyproc extension).
o Two plastic universal bushings or junction box connectors.
o White wire (12”), two insulated spade connectors.
o Black wire (6”), two insulated spade connectors.
o Brown wire (12”), two insulated spade connectors.
o Yellow wire (12”), two insulated spade connectors.
o Two cabinet mounting screws.
Low Speed Switching Relay Installation Instructions
1) Turn OFF POWER to the oil furnace and wood furnace.
2) Mount the switching relay in a junction box, in the blower compartment near the
blower motor and motor wires. (If possible mount relay on rubber or foam pad to
reduce noise in ductwork).
3) Remove the white neutral wire from the blower motor, and connect it to a selected
neutral side of the relay coil.
4) Connect the white wire (item 2) to the second spade of the selected neutral side of
the relay coil, and the other end into the blower neutral wire location (where initial
white wire was removed).
5) Remove the black high-speed wire from the blower motor (this should be the
selected blower heating speed), and connect it to the power side of the relay coil
(no relay spade #).
6) Connect the black wire (item 3) to the second spade of the selected power side of
the relay coil, and the other end of the wire on to one side of the normally open
contacts (relay spade #1).
7) Connect the brown wire (item 4) to the high-speed connection on the blower motor,
and the other end of the wire on to the other side of the normally open contacts
(relay spade #3).
8) Remove the yellow low-speed wire from the blower motor (this should be the
selected low-speed in the furnace wiring box), and connect it to one side of the
normally closed contacts (relay spade #4).
9) Connect the yellow wire (item 5) to the low-speed connection on the blower motor,
and the other end of the wire on to the other side of the normally closed contacts
(relay spade #5).
10)Turn ON POWER to the oil furnace and wood furnace. Check relay operation.
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SCOTSMAN WOOD FURNACE – INSTRUCTION MANUAL
2.7 DUCT CONNECTION (Fig S101-5, Fig S101-1)
See figure S101-12 for Approved Furnace Ductwork Configurations.
See figure S101-13 for Prohibited Furnace Ductwork Configurations.
The use of A/C coils is not recommended unless special arrangements are made.
Minimum cross-sectional area of ductwork from furnace should be approximately 180
sq. in. with equal or larger size for return air.
The furnace must not be installed as a gravity system as the controls are not designed
for this type of operation.
The dimensions and locations of permissible openings in casings for ducts, blower, or
emergency air are clearly identified on the furnace or on specific templates enclosed in
the firebox.
DO NOT use duct elbows having an inside radius of less than 6 in (155mm). Use only
16 x 20 in. duct “S” type interconnection for this furnace.
Make or enlarge the openings in the wood furnace casing exactly as identified for add-
on connection and on the appropriate side, trim the furnace insulation flush with cut
opening. Fasten edges of insulation securely with metal straps or bend tabs of duct
starting collar over insulation edge to hold it in place.
Make all duct connections for the “S” type interconnection (See Fig S101-5).
CAUTION - The DB-101-ADD is NOT certified for installations using a divider in the
plenum of the oil furnace. An ADD-ON unit must only be connected to a furnace, duct
system and chimney, which are in good operating condition. DO NOT relocate any of
the safety controls in the original furnace installation. Operate the oil-fired unit
periodically to ensure that it will operate satisfactorily when needed.
DO NOT connect to duct work so that a reverse flow is possible. Before attempting
installation, determine if there is suitable space available in the furnace area for the
furnace connection outlined herein.
The external static pressure in the warm air duct to the house of the original system
must be measured prior to any changes to the system. These are to be reset to the
same values after the add-on procedure to maintain airflow through the oil furnace.
An important requirement of this type of installation is that when installed in an existing
system the main ducts may have to be lowered to assure proper and safe clearances
from combustible material. (See Fig S101-1).
After all connections are made a static pressure test and/or temperature measurement
must be made in the outlet plenum of the wood furnace. This is a simple procedure and
is outlined as follows using a Dwyer Model 25 or equal inclined manometer:
Drill hole in wood outlet plenum.
Level inclined manometer and adjust to zero, insert manometer tube (Pressure end).
With all duct work and doors in place static pressure should measure 0.2 in (50 Pa) with
blower running.
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SCOTSMAN WOOD FURNACE – INSTRUCTION MANUAL
Pressure may be corrected by the following measures:
1) Change blower pulley size (usually decrease)
2) Change blower motor pulley (usually increase)
3) Increase return air duct area (if restricted)
CAUTION – Current draw by blower motor should be checked after making any pulley
change. If motor now draws greater current than that shown on the nameplate a larger
more powerful motor must be installed.
IMPORTANT – DO NOT change the blower.
As an alternative to the static pressure test method, the installer may make adjustments
on the basis of temperature measurement. For this test wood furnace must be at full
operating temperature.
Take one temperature measurement in the front of the oil furnace plenum 12” to 16” up
or approximately center. Take a second measurement in the wood furnace plenum
(same position). Subtract one measurement from the other to arrive at a temperature
difference (TD). The TD must be between 40º F and 100º F during normal operation,
and ideally around 80º F. The same adjustment procedure for pulleys applies for
correction when using this method.
CAUTION – Most thermometers have a large time lag in reaching accurate measuring
levels. It is important that this interval be measured for your thermometer by immersing
it in boiling water and observing the time required for it to reach correct reading.
IMPORTANT – This equipment shall be installed in accordance with the instructions of
the manufacturer and in a manner acceptable to the regulatory authority by technicians
experienced in such services. When required by the regulatory authority, such
technicians shall be licensed to perform this service.
The installation shall comply with the applicable requirements of CSA standard B365,
Installation Code for Solid Fuel Burning Appliances and Equipment, and if changes are
made to the oil furnace this shall comply with CSA Standard B139, Installation Code for
Oil Burning Equipment.
2.8 Control System (Fig S101-5)
The fan and limit control and the damper motor should be located as shown in Figure
S101 - 5.
The control system serves the following functions:
T822 – Room Thermostat – Wood Furnace
The primary control is the room thermostat located near the center of the house in the
main floor or near an existing thermostat. The thermostat operates the damper motor to
open and close the damper door thus allowing more or less air into the combustion area
to control the fire.
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SCOTSMAN WOOD FURNACE – INSTRUCTION MANUAL
M847 – Damper Motor
The damper door lever should be attached to the damper motor wheel with the chain
included. Be sure the damper door is fully closed and the damper motor is not
powered. Connect the chain to the damper door level and to the bottom hole in the
damper motor wheel. As a final adjustment bend the top chain link slightly to vary the
damper position.
L4064R – Wood Furnace/Limit Control
The fan and limit control mounted in the plenum controls the operation of the circulating
blower and limits the air temperature to prevent the furnace from overheating.
Set Points
1) “ON” is usually set to 140?F (60°C). It turns on the circulating blower when the air
temperature in the plenum reaches this temperature.
2) “OFF” is usually set to 100°F (38°C). It turns off the circulating blower when the
circulating air temperature in the plenum drops to this temperature.
3) “Hi limit” is preset to 280°F (138°C). This will over ride the room thermostat to
close fire damper door if the wood furnace overheats.
2.9 INSTALLERS FINAL CHECKLIST
DUCTWORK INSPECTION
1) Furnace ducted properly?
2) Proper duct clearances maintained?
FURNACE INSPECTION
1) DO NOT use firebrick in the furnace
2) Check settings on fan limit controls.
WIRING INSPECTION
1) Is main disconnect switch within view?
2) Wiring cables protected from heat and not touching hot surfaces?
FLUE AND SMOKE PIPE INSPECTION
1) Flue inner size equivalent to 7” round or larger?
2) Separate entry and lower to flue for both solid-fuel and oil or gas smoke pipes?
3) Smoke pipe 24 gauge or better?
4) Smoke pipe secured by screws?
5) Draft regulator (if used) set at .05” wc maximum?
6) Clearances of smoke pipe 18” or better from combustible material?
Metal protection is recommended.
DEALER TO INSTRUCT HOMEOWNER
1) Keep area around unit clean.
2) Use DRY wood only. Hardwood preferred.
3) Load carefully.
4) Load level no higher than center of door.
5) Remove ash regularly as directed.
6) Watch for soot build up in smoke pipe.
7) Danger of flue fire if poor fuel or poor maintenance produces creosote buildup.
8) Operation of unit during power failure. (i.e. manual operation.)
9) When shutting down for extended periods, clean unit thoroughly.
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SCOTSMAN WOOD FURNACE – INSTRUCTION MANUAL
ADDENDUM
FOR OIL FURNACES HAVING MULTI-SPEED
BLOWERS WITH CONTINUOUS CIRCULATION
CAPABILITY.
Add-on furnaces such as the Kerr Scotsman and Scotty
SS can be installed with oil fired warm air furnaces such
as the Kerr KD Gemini that have continuous blower
circulation capability. A relay must be used if the furnace
is to maintain the continuous circulation feature. See
wiring diagrams for the proper electrical connections.
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Oct-06
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Terms and Conditions of Warranty
5) Without restricting the generality of condition
4 hereof, a furnace which is permanently
distorted as a result of burning out of control
is not to be considered to be defective in
material or workmanship and is specifically
exempted from coverage under the warranty.
1) The warranty is not assignable and rights
pursuant to it are given only to the original
purchaser of the furnace from an authorized
retailer.
2) The warranty is null and void unless the
original purchaser fully completes the
warranty registration card and the card is
received by Kerr Heating Products within 30
(thirty) days after installation of the furnace.
6) Damage to the furnace or any part or
accessory from abuse, misuse, overfiring or
improper installation, or any furnace which
has been altered or used in connection with
third party equipment or materials is
specifically excepted from coverage under
this warranty.
3) The warranty applies only to defects in the
heat exchanger resulting from defective
material and/or workmanship and the rights
of the purchaser as to claims resulting from
defects in other parts or accessories of the
7) The warranty of the repaired or replaced
heat exchanger is limited to the period of the
unexpired portion of the original warranty.
furnace
supplied
by
suppliers
or
manufacturers other than Kerr are limited to
the rights, if any, which a purchaser has
against such other manufacturer or supplier
and the warranty does not apply to any heat
exchanger, parts or accessories which must
be repaired or replaced for any reason other
than as aforesaid including fire, flood, act of
God or other cause.
8) No furnace or part thereof shall be returned
to Kerr except pursuant to Kerr’s written
authorization.
9) Except to the extent of the cost to the repair
or replacement of the heat exchanger in
accordance with the terms and conditions
hereof Kerr shall not be liable for any direct,
special, secondary, indirect, incidental or
consequential damages resulting from failure
to perform its obligations hereunder, or part
or failure to perform function of any furnace
or any part or for any cause beyond its
control, including without limitation, fire,
flood, strike, weather, impossible roads,
labour disturbance, accident, shortages or
labour, parts, material, acts of God, or
Governmental authorities.
4) The warranty of the heat exchanger against
defects of material and/or workmanship is
limited to its repair or replacement f.o.b. Kerr
Heating Products, Parrsboro, Nova Scotia
provided such defect is in the sole opinion of
Kerr, the result of defective materials and/or
workmanship and not the result of others
carelessness or failure to erect, install,
operate or maintain the furnace in
accordance with the written instructions of
Kerr. The cost of any labour for the removal
or replacement of defective parts shall be the
responsibility of the purchaser and Kerr shall
be responsible only for the cost of repairing
or replacing the defective part f.o.b. Kerr
Heating Products, Parrsboro, Nova Scotia.
10) The exclusive remedy of the purchaser is as
set forth herein and there are no
representations,
warranties,
collateral
agreements, or conditions affecting the sale
and Kerr makes no warranty of
merchantability or of fitness for any purpose
and there is no warranty either expressed or
implied beyond that set forth herein.
WARRANTY REGISTRATION CARD - This card must be filled in and mailed within 30 days.
Name of Purchaser: ________________________________________________________________________________
Installed at (Street & Number): _______________________________________________________________________
City, Province/State & Postal/Zip Code: ________________________________________________________________
Name of Installer: __________________________________________________________________________________
Installer’s Address: _________________________________________________________________________________
Date Installed: __________________ Model Number: _______________ Serial Number: _____________________
This installation is for:
If replacement, make and type of previous heating system:
How did you find out about Kerr furnaces or boilers: ? Television ? Magazine ? Newspaper ? From a Friend
? Recommendation form Kerr Dealer ? Radio ? Internet ? Other (please specify): ___________________________
? New Home
? Existing Home
? Wood ? Electric
? Oil
? Gas
Purchaser’s Signature: ______________________________________________ Date: __________________________
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ATTENTION HEATING CONTRACTOR:
THIS WARRANTY IS FOR THE ORIGINAL PURCHASER AND SHOULD BE
GIVEN TO HIM/HER OR PLACED IN SIGHT NEAR THE WOOD FURNACE.
SCOTSMAN
WOOD FURNACE
5 YEAR
WARRANTY
Subject to the terms and conditions on the reverse side hereof Kerr Heating
Products (hereinafter called “Kerr”) warrants as follows:
The heat exchanger of the wood furnace (hereinafter called the “furnace”)
against defects of materials and/or workmanship appearing within a period
of five years from date of installation.
All other parts and accessories of the furnace in accordance with the
warranty (if any) given by the respective supplier or manufacturer to Kerr.
CAUTION:
When burning green (wet) wood careful inspection should be made of
your chimney and smoke pipe to ensure a build up of creosote does
not occur which may cause a flue fire.
PLACE
STAMP
HERE
Kerr Heating Products
12118 Hwy 209
PO Box 637
Parrsboro, Nova Scotia, Canada
B0M 1S0
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