PSG MAX CADDY User manual

.
PSG
1700, Léon-Harmel
Québec (Québec)
G1N 4R9
Installation and Operating Instructions
for the CADDY ADD-ON wood burning
furnace
READ THE MANUAL THOROUGHLY
BEFORE OPERATING THE FURNACE
CONGRATULATIONS!
You have purchased one of the finest wood
add-on furnaces available on the market.
Your furnace will provide years of satisfaction and safe operation.
Please keep this document
Certified for Canada and the United States by
Omni-Test Laboratories.
45215
Revised : October 21st, 2009

1
TABLE OF CONTENTS
INTRODUCTION.........................................................................................................................................2
1. CHIMNEY AND DRAFT........................................................................................................................2
2. SAFETY RULES.......................................................................................................................................2
GENERAL REQUIREMENTS...................................................................................................................2
ODOUR FROM THE PAINT......................................................................................................................3
ASH DISPOSAL.........................................................................................................................................3
CREOSOTE BUILD-UP AND REMOVAL...............................................................................................3
SMOKE DETECTOR .................................................................................................................................4
DOOR GLASS ............................................................................................................................................4
GLASS SPECIFICATIONS........................................................................................................................4
ASH DRAWER...........................................................................................................................................4
ASH GRATE...............................................................................................................................................4
3. APPLIANCE INSTALLATION ..............................................................................................................5
UNIT LOCATION ......................................................................................................................................5
MATCHING THE TRANSFER DUCT BETWEEN THE TWO HEAT GENERATORS..........................5
MINIMUM CLEARANCES TO COMBUSTIBLE MATERIALS FOR CADDY ADD-ON.....................7
PIPE CONNECTOR AND DAMPER.........................................................................................................8
DAMPER ....................................................................................................................................................9
COMBUSTION AIR...................................................................................................................................9
ELECTRICAL CONNECTIONS..............................................................................................................10
THERMOSTAT........................................................................................................................................10
FAN CONTROL .......................................................................................................................................11
4. OPERATING INSTRUCTIONS............................................................................................................11
LIGHTING................................................................................................................................................12
PREHEATING..........................................................................................................................................12
HEATING.................................................................................................................................................12
EARLY SIGNS OF OVERFIRED FURNACE.........................................................................................13
WOOD AS HEATING FUEL....................................................................................................................13
CHIMNEY FIRES.....................................................................................................................................14
PROLONGED POWER OUTAGE...........................................................................................................14
5. MAINTENANCE ....................................................................................................................................15
MAINTENANCE OF THE EXCHANGERS............................................................................................15
CHIMNEY MAINTENANCE ..................................................................................................................16
SMOKE PIPE INSPECTION....................................................................................................................16
DOOR GASKET MAINTENANCE .........................................................................................................16
6. WIRING DIAGRAM CADDY ADD-ON..............................................................................................17
7. TECHNICAL DATA CADDY ADD-ON FURNACE..........................................................................18
8. DUCTS AND DAMPERS DIMENSIONS.............................................................................................19
9. CADDY ADD-ON BRICKS LAYOUT..................................................................................................20
10. APPENDIX 1 .........................................................................................................................................21
11. TROUBLESHOOTING........................................................................................................................22
PSG LIMITED LIFETIME WARRANTY...............................................................................................23

2
INTRODUCTION
Take note that this furnace operates like an EPA wood burning stove. This applies to the firing,
the embers and the minimum combustion air which depends on the type and the grade of the
combustible.
This model line is certified as meeting the emissions limits in 40 C.F.R. part 60, section 60.532
(B) per EPA methods 28 and 5G-3, February 1988.
To optimize the efficiency of your furnace, follow the following advices:
Respect the local codes (when in doubt, consult your local dealer).
Make sure your furnace is installed according to the instructions on the certification plate.
All controls adjustments must be performed by a qualified technician. The controls settings
and the blower speed must conform to the recommendations of the Warm Air Heating and Air
Conditioning National Association and respect the recommended static pressure ranges in the
warm air plenum of the furnace (see General Technical data, static pressure).
The wood burning Caddy Add-on furnace is approved for in-line connection to an
existing oil furnace with a firing rate of 0.8 G.P.H. (US) to 1.2 G.P.H. (US) or any gas or
electric furnace with comparable heat output.
1. CHIMNEY AND DRAFT
This furnace must be connected to a chimney certified for wood burning heating appliances; a
7” connector and chimney is highly recommended.
If draft exceed –0.06 in. W.C a barometric damper should be installed on the smoke pipe.
Never install a manual damper.
The barometric damper must be adjusted so that the maximum draft measured at the
furnace outlet does not exceed -0.06 in. w.c. Please note that a draft exceeding -0.06 in. w.c.
could produce an uncontrollable fire. On the other hand, the minimum draft required is -0.04
in. w.c. in the evacuation pipe on the wood side.
2. SAFETY RULES
GENERAL REQUIREMENTS
Make sure the chimney outlet and the pipes are clean and in good condition.
Do not use chemical products or liquid fuel to light the fire.
Do not burn wood coated with paint, glue or chemical products.
Do not burn wastes or flammable liquids such as gasoline, naphtha or motor oil.
Do not install an automatic feeder on this furnace.
Do not store wood in the vicinity of the furnace. Respect the required clearances between
combustible materials and the source of heat.
Average emissions rate: 6.56 g/hr
Average heating efficiency: 71.43%

3
WARNING
-THE ASH DRAWER AND EXCHANGERS ACCESS PANEL GET
VERY HOT, DO NOT HANDLE WITH BARE HANDS.
ODOUR FROM THE PAINT
The furnace will release some smoke and odors when first fired; this is normal and will stop
when the paint has finished curing. Burn the unit at high rate with windows opened until the
smoke and smell is vented out.
ASH DISPOSAL
Ashes must be placed in a metal container with a tight fitting lid. The ash container should be
stored outdoors, well away from all combustible materials. If the ashes are intended to be buried
in soil, wait until all cinders have thoroughly cooled before burying.
CREOSOTE BUILD-UP AND REMOVAL
When wood is burned slowly, it produces tar and other organic vapors which, when combined
with moisture, produce creosote. The creosote vapors condense in a relatively cool chimney and
flue. As a result, creosote residues accumulate on the chimney and flue linings.
N.B. To minimize the frequency of the chimney cleaning, buy your firewood at least one year
before using it. Store in a dry place in order to obtain the minimum moisture rate and optimize
the efficiency. Do not store wood or combustible materials within the installation minimum
clearances and space required to reload the appliance and remove the ashes.
When ignited, creosote produces an extremely hot fire inside the chimney.
To avoid this situation, it is important to do the rotation of wood. Inspect the chimney system at
regular intervals to determine a cleaning cycle. A weekly cleaning might be required during mild
temperature periods but a monthly cleaning should be sufficient during cold periods. If a
significant layer of creosote has accumulated, it should be removed immediately to
eliminate the risk of a chimney fire. Remember that a small hot fire is preferable to a large
smoldering one that can deposit creosote within the system. An emergency plan is necessary in
case of a chimney fire. It’s important to clean the exchangers thoroughly at the end of the
season to prevent corrosion.

4
SMOKE DETECTOR
We highly recommend the use of a smoke detector. It must be installed at least 15 feet (4,57
m) from the appliance in order to prevent a false alarm when refueling the fire.
DOOR GLASS
To maintain a clean and safe installation, do not build your fire too close to the glass or allow
the logs to lean on the glass.
Do not operate your furnace at too low a setting. Keep the air inlet opened long enough during
the fire start-up to prevent the fire from going out, which would soot up the door glass.
An intense fire will help keeping the glass clean. However, in the event that your glass gets too
dirty, which should not occur, you will have to clean it using a wet cloth and an oven cleaner. The
glass can be cleaned ONLY when the unit has cooled down. Do not use abrasive cleanser. You
can find special cleansers for wood stove glasses in any wood stove or hardware store.
WARNING: Avoid knocking or scratching the glass which could be damaged.
GLASS SPECIFICATIONS
The glass is made of Neoceram type of glass, 3/16” – (5 mm) thick.
Do not operate your furnace with a broken glass, as this could seriously damage your
appliance.
You can purchase a replacement glass from your PSG dealer.
ASH DRAWER
Your appliance is equipped with an ash drawer to collect ashes produced by the combustion of
wood. This drawer must not be left opened during combustion as this will cause over firing and
serious damage to the furnace*.
The drawer must be cleaned regularly.
ASH GRATE
In case of ash grate damage, contact your dealer to get a replacement. The steel cover on the
ash grate is meant to optimize the temperature inside the combustion chamber and should only
be removed to empty the ashes.
*It is mandatory that the door and the ash drawer be kept closed while the appliance is in use.
Maintain all seals in good condition ; in case of deterioration, contact your dealer for replacement.

5
3. APPLIANCE INSTALLATION
Before installation, please read the instructions carefully and make sure you
understand them:
The furnace must be installed in a state of the art manner. Installation must be made in
accordance with the CSA B.365(Canada) and NFPA 211(USA) standards concerning the
normalization of solid fuel units. For installation in United Sates, also refer to NFPA
90B(USA) « Warm Heating and Air Conditioning Systems ». If modifications have to be
made to the existing furnace, these have to be conform with the CSA B.139 (Canada) and
NFPA 31 (USA) regulation for oil furnaces.
Inspect the furnace to make sure that nothing has been damaged in the shipping. Pull
out the wiring kit and the instructions manual from the firebox of the furnace and the
cleaning tools from the heat exchangers.
UNIT LOCATION
The furnace must be installed where outside air supply will be sufficient for proper combustion.
In airtight houses, it might be necessary to install an outside air inlet (see details in: «3-
INSTALLATION» COMBUSTION AIR).
The furnace must be positioned so that the connector is as short as possible. Minimize the use
of 90oelbows.
The owner must ensure a proper installation to allow a safe operation of the
appliance.
MATCHING THE TRANSFER DUCT BETWEEN THE TWO HEAT
GENERATORS
Install the plenum and heating ducts in line as in option 1 of appendix 1. In series
connection should be considered only if in line connection is not feasible.
If the ducts are installed in series (appendix 1, option 2) and the oil furnace’s fan limit
control is mounted on the plenum, the divider in the plenum must be installed at least 5”
(127 mm) above the fan limit control casing. This divider must be air tight.
Do not install connecting ducts in a way that would allow inversion of the air flow.
Do not use elbows with a radius less than 6 inches (153 mm).
The transfer duct between the existing furnace and the add-on must be at least 320
square inches(0.2m2) and deviations radius must be at least 6”(153mm). (see the drawing
on the following page)
Do not remove any safety device from the existing furnace.

6
You must determine the air flow through the existing furnace before installing the
Caddy add-on:
1. Run the oil furnace for at least 15 minutes, or until it reaches its maximum
temperature.
2. With a thermometer, measure the temperature of the cold air entering the furnace
and that of the air exiting the furnace in the hot air plenum.
The temperature rise is obtained by subtracting the cold air return temperature from
that of the air exiting in the hot air plenum..
3. Make the following verifications (OIL):
CFM = orifice size (SI)(liter/hour) x 39 023 x E
1.21 x T
CFM = orifice size (Imperial)(gallon/hour) x 140 000 x E
1.1 x T
E : Average heat generator efficiency (0.75)
T : Temperature rise (ºC)
4. After the installation of the add-on, the original numbers must be restored in order
to maintain a constant air flow through the furnace.

7
MINIMUM CLEARANCES TO COMBUSTIBLE MATERIALS FOR CADDY ADD-ON
N.B. This appliance must be installed in accordance with the instructions on the certification
plate applied on the unit.
SEE
FIGURE
BELOW STATIC PRESSURE
CHECK POINT
MIN. 0.020" W.C.
24"
REAR
WALL
45°
ELBOW
AIR INLET CAN BE ON
LEFT OR RIGHT SIDE
6"
SIDE
WALL
18"
CEILING
HOT AIR
PLENUM
6" 72" 1"
12" MIN.
The furnace may be installed on a combustible floor.
N.B. THE AIR RETURN CONDUITS SHOULD BE AT LEAST EQUAL TO THE COLD AIR PLENUM
DIMENSIONS.
Hot air plenum minimal height.

8
PIPE CONNECTOR AND DAMPER
This furnace must be connected to a duct system and a chimney that are in good condition; the use of separate
chimneys is recommended.
If the furnace is connected to an oil furnace and both appliances must share the same chimney, the chimney
and smoke connector must be 7” in diameter and approved for use with wood-burning appliances. The use of 6”
connector and chimney is permitted if the wood furnace evacuates into a separate chimney.
It’s strictly forbidden to connect a solid fuel burning appliance to a chimney deserving a propane or
natural gas appliance. Regulation CAN-CSA-B365.1.
Do not install a manual damper
For a proper installation, follow the following advices :
1. All the joints of the evacuation pipe must be secured with three screws.
Make sure that each screw goes through the inner wall of both connectors (male and female). See
pictures below showing a male-female coupling.
Before proceeding to connection, remove all accessories, such as
scraper, shovel and poker from the evacuation pipe of the furnace.
PROPER INSTALLATION FAULTY INSTALLATION
7" DIAMETER
CAUSES RESTRICTION
REDUCER
OIL PIPE

9
2. A minimum upward slope of 1/4 inch per horizontal foot must be
respected.
DAMPER
The barometric damper must be adjusted so that the maximum draft measured at the
furnace outlet is limited to -0.06 in. w.c.. However, the minimum draft to be respected at all
times is -0.04 in. w.c. on the solid fuel side.
WARNING: DRAFT HIGHER THAN -0.06” W.C. MAY CAUSE AN UNCONTROLLABLE
FIRE.
COMBUSTION AIR
When the furnace and the chimney are completely cold, it might be necessary to provide
fresh air by opening a door or a window for a few minutes while lighting.
Take note that a house constructed or renovated in order to be airtight is liable to lack fresh
air which is necessary for a proper combustion and operation of heating appliances.
When starting up the fire, do not operate appliances which evacuate air outside the house
such as:
- Range hood
- Air exchanger
- Cloths dryer
- Bathroom fan
- Ventilated central vacuum system
NOTE:
It is recommended to install an outside air inlet of minimum 4” in diameter in or near the
room where the heating appliance is installed (see drawing on the next page). When doing
so, it is preferable to choose a wall which is not exposed to dominant winds, depending on the
conditions surrounding your house.

10
AIR SUPPLY
INSULATED PIPE
EXTERIOR WALL
AIR INLET
N.B. The owner of the furnace is responsible for the room salubrity in case of
negative pressure or temporary negative pressure.
ELECTRICAL CONNECTIONS
The following instructions do not replace those of the local code.
CADDY ADD-ON
Installation and verification of this appliance must be done by a qualified service man.
Mount the fan limit control on the side of the furnace opposed to the transfer duct between the two
heat generators. Install the damper motor on the upper right side of the front panel (mounting holes are
already drilled).
If the ducts are connected in series (appendix 1, option 2) and the fan limit control of the existing
furnace is located in the plenum, the divider must be installed at least 5" (127 mm) above the fan limit
casing. This divider must be airtight.
All wiring and connections must be done according to the diagram. The controls of the two
furnaces must be interconnected.
ATTENTION : ONLY USE WIRES SUITABLE FOR 75°C (167°F).
THERMOSTAT
The thermostat must be installed on an inside wall in a location where it is not likely to be
affected by the draft coming from an air outlet. It must be installed at a minimum of 55 inches
above the floor. The two thermostats on a combined system must be installed at the same
height. In normal bi-energy operation, the wood system thermostat should be set 2oto 3o
higher than the electric system thermostat.

11
FAN CONTROL
The fan control settings vary depending on the type of installation. The “fan off” setting is
preset at 110oF at the factory. This setting should provide a proper operation in most
installations. The “fan on” setting is factory set at 150oF.
It is preferable for a prolonged operation of the blower that the “fan off” setting be low
enough. But a “fan off” setting too low will cause undesirable cold air circulation. To modify
the setting, turn the indicator at the desired position on the temperature scale of the fan limit
control.
The adjustment of all controls must be performed by a qualified technician. The controls
and the blower speed settings must conform to the recommendations of the “Warm Air
Heating and Air Conditioning National Association”.
The switch located below the fan limit control operates the low speed either at the “on”
position or the “off” position. For a better efficiency we recommend to leave the high speed
on automatic for heating and to use the low speed for continuous air circulation.
It is possible that the blower and motor pulleys have to be replaced in order to obtain the
desired air flow through the system. (The use of a more powerful motor is permitted on the
belt driven blowers). Direct drive motors may not be replaced but they may be upgraded by
replacing the capacitor.
WARNING : the blower of the existing furnace may not be changed.
4. OPERATING INSTRUCTIONS
Start the existing heat generator periodically to make sure it is in good working
condition.
On the wood furnaces, the thermostat controls the air inlet damper. When the thermostat
calls for heat, the damper opens and the combustion is stirred up. When the furnace gets hot
enough, the fan limit control activates the blower motor at the speed selected for wood
heating.
The chain that links the air inlet latch to the damper motor must have a 1/8 inch play.
When there is no call for heat, the air inlet latch must be completely closed and the chain
must be hooked up to the damper motor at the “8 o’clock” position. *
*(With all reserve for the minimum air intake to be increased depending on the type and
quality of the combustible).

12
LIGHTING
NEVER USE CHEMICALS OR FLAMMABLE LIQUIDS TO LIGHT THE FURNACE
1. Open the door
Note: If there already is a good ember bed in the furnace, go to step b) Pre-heating.
2. Remove the steel plate on the ash grate and empty the ashes in the ash drawer.
3. Put the steel plate back in place, making sure it is properly seated. The steel plate on the
ash grate is intended to optimize the heat retention into the combustion chamber.
4. Place one or two pieces of dry kindlings at the front of the furnace.
5. Place newspaper strips on top of the kindlings.
6. Cover the newspaper with small pieces of dry wood.
7. Add newspaper strips, then light the fire as low as possible and leave the door 1/2" (13
mm) opened. If lighting fails, you might experience a smoke back draft through the air
inlets.
PREHEATING
1. Once the kindling is well ignited or the coals revived, put 2 or 3 fire logs in such a way that
the flames can interlace between the logs and close the door. It is important to respect
these loading sequences in order for the wood to burn from the front of the furnace towards
the back in a cigar like manner..
2. Wait 15 to 20 minutes then proceed with loading the furnace.
HEATING
1. When reloading the furnace, first spread the embers at the center of the combustion
chamber before adding new logs.
2. Do not overload. Air must circulate freely in the upper part of the combustion chamber in
order to obtain an efficient operation of the appliance. Note that a small hot fire will
produce much less creosote than a large smouldering one.
IMPORTANT: DURING THE HEATING PROCESS, REMOVE THE ASHES
AND WOOD THAT COULD OBSTRUCT THE 1/4" (6.4 mm) HOLE LOCATED
BELOW THE DOOR INSIDE THE FURNACE.

13
PROCEDURE TO OPEN THE LOADING DOOR
TO MINIMIZE THE RISK OF SMOKE SPILLAGE, OPEN THE DOOR 1”
AND WAIT ABOUT 10 SECONDS BEFORE OPENING COMPLETELY.
THE PURPOSE IS TO STABILIZE THE PRESSURE INSIDE THE FURNACE.
EARLY SIGNS OF OVERFIRED FURNACE
1. Roaring fire.
2. Chimney connector is glowing red.
3- Extreme heat coming from the furnace.
If this occurs, DO NOT OPEN THE DOOR, shut-off the air inlet completely, and wait until the
glow has completely subsided.
ALWAYS KEEP THE DOOR AND THE ASH DRAWER CLOSED
(except for lighting and maintenance).
WOOD AS HEATING FUEL
9DO NOT USE CHEMICALS OR FLAMABLE LIQUIDS TO LIGHT THE FIREPAS
9DO NOT BURN TRASH, GASOLINE, NAPHTA, MOTOR OIL OR OTHER SUCH
MATERIALS.
We recommend that you burn seasoned hard wood only.
There are two important factors to be considered when choosing a type of wood: the
moisture content and the wood density. Hardwood, such as maple, oak or beech will provide
better results because of the high density and minimal tar produced during combustion. It is
highly recommended to use wood that has been dried at least six months. Do not use coal
as heating fuel in this appliance.
Whenever a high rate of smoke is noticed in the room, you must:
1. Open doors and windows.
2. Make sure the furnace door is closed as well as the damper (if necessary, lower the
thermostat starting point or undo the chain of the damper and close the barometric control
manually).
3. When the furnace has cooled down, inspect the chimney to detect obstructions and consult
a specialist to determine the cause.

14
CARBON MONOXYDE IS A LETHAL GAS (ODOURLESS AND COLOURLESS), WHICH YOU
MUST BEWARE OF.
CHIMNEY FIRES
This might occur when the fire gets extremely hot and may be triggered by the burning of
cardboard, branches or small pieces of wood when the flame ignites the creosote residues
accumulated in the evacuation system. The usual signs of chimney fire are:
1. Rumbling
2. The flue gets extremely hot
3. Flames or sparks are coming out of the chimney
In case of a chimney fire, call your local fire department immediately and sprinkle the
roof around the chimney with water.
Make sure that the furnace door is closed as well as the damper (if necessary, lower the
thermostat setting or release the chain of the damper and CLOSE the barometric damper
manually).
If the fire gets uncontrollable due to an improper use or because the draft is too strong,
follow the same procedure as in a chimney fire except that you will have to OPEN the
barometric damper manually.
LOCAL FIRE DEPARTMENT.
Phone number: ___________________________________
PROLONGED POWER OUTAGE
In case of prolonged power outage (more than 10 minutes), in order to diminish the risk of
overheating, it is recommended to :
-Make sure that the furnace’s damper is closed.
-Open the filter compartment of the existing furnace in order to facilitate the circulation
of air, through natural gravity, around the wood add-on combustion chamber.

15
5. MAINTENANCE
MAINTENANCE OF THE EXCHANGERS
The smoke pipe and the exchangers should be inspected regularly during the heating
season. Easy access is provided (without the use of tools): simply unscrew the wing nut on
the exchangers’ access panel (see pictures below).
Before cleaning the three exchanger pipes, move the upper plate of the combustion
chamber forward (see drawing below). Using the scraper, clean the three exchanger pipes.
The accumulated dirt in the side exchangers will fall into the combustion chamber; the dirt in
the central exchanger will have to be removed from the front or the back of the furnace. Make
sure that the upper plate is free of ashes and do not forget to put the upper plate back in
its original position. Close the exchangers access panel.
Wing nut
Exchangers’ access
Insulation
pad

16
CHIMNEY MAINTENANCE
One of the most efficient methods to sweep the chimney is using a hard brush. Brush
downwards so soot and creosote residues will come off the inner surface and fall at the
bottom of the chimney where they may be easily removed.
The chimney must be checked regularly and if creosote has accumulated, it must be
removed to prevent chimney fires. Cleaning on a monthly basis should be sufficient during the
coldest months.
SMOKE PIPE INSPECTION
- The smoke pipe should be inspected regularly during the heating season.
- If possible, the smoke pipe should be dismantled and cleaned.
- The smoke pipe should be inspected to detect any defect.
- If no defect is noticed, put the flue back in place; otherwise, it must be replaced.
- Use only wood as a combustible.
Seasoned hard wood logs, 18” to 22” long, are recommended as a combustible.
DOOR GASKET MAINTENANCE
It is important to maintain the door gasket in good condition. After a while, the gasket might
sag which will necessitate a door adjustment.
Adjust door as follows:
1. Unscrew completely the locking pin (see picture below).
2. To increase the pressure of the door on the gasket, turn the handle counter clockwise. To
decrease the pressure of the door on the gasket, turn the handle clockwise.
3. Finally, screw back the locking pin about 1/4” deep, taking care to lock it in place with the
nut.
Locking pin

17
6. Wiring diagram Caddy Add-On
BURNER RELAY
L1
JUNCTION BOX
BLACK
CY
INTERLOCK
BROWN
BLACK
FAN MOTOR(EXISTING UNIT)
W
G
L2
R
WHITE WHITE BLACK
RED
TT
HONEYWELL
L6064
LOW
BLACK
LINE
FAN
LIMIT 250°F
OFF 110°F
BLUE
RED
LINE
LOAD
HIGH
ON 150°F
LIMIT
WOOD
THERMOSTAT
DAMPER
MOTOR
EXISTING UNIT
THERMOSTAT

18
7. TECHNICAL DATA CADDY ADD-ON FURNACE
CADDY ADD-ON
A 29 1/2"(750mm)
B 25 1/2"(648mm)
C 47 1/4"(1200mm)
D 28 1/2"(724mm)
E 24 1/2"(622mm)
F 44"(1118mm)
G 22 1/8”(562mm)
H 14 3/8”(365mm)
FLUE 6"(152mm)
WEIGHT 445Lb (202kg)
TECHNICAL DATA
MODELE TEMP. BTU/HR STATIC PRESSURE
VARIABLE (BOIS) MIN. MAX.
°C(°F)
CADDY
ADD-ON 26 (78) 140 000 0,2 0,6
H20

19
8. DUCTS AND DAMPERS DIMENSIONS
SIMPLIFIED METHOD
DISTRIBUTION SYSTEM
Ducts size (heat)
4 inch outlet reduce by 1”
5 inch outlet reduce by 2” Always by 8” thick
6 inch outlet reduce by 3”
N.B.: The main duct must be reduced every 2 outlets.
Ducts specifications (heat)
Dimensions Length Elbow Average equivalence
4” 10’ 1 x 90oMax 4,000 Btu
5” 10’ 1 x 90o Max 6,000 Btu
6” 10’ 1 x 90o Max 7,000 Btu
DAMPER
For a 4” warm air outlet: 2” x 10” damper
For a 5” warm air outlet: 2” x 12” damper or 4” x 10”
For a 6” warm air outlet: 2” x 14” damper or 4” x 12”
WARM AIR SYSTEM INSTALLATION
HOUSE DIMENSIONS
Example: 28 x 40 bungalow: 1,120 sq. ft.
28 x 40 x 8: 8,960 cu. ft. x 1.8 Ch. air/hr: 16,128 Btu
Exposed walls:
40 + 40 + 28 + 28: 136 x 8: 1,088 cu. ft. x 22: 23,936 Btu
Number of windows:
12 of 3 x 4: 144 x 60: 8,640 Btu
Number of doors:
2 x 3 x 7: 42 x 100: 4,200 Btu
52,904 Btu
Non-insulated basement: 25%
Insulated basement: 15% 7,906 Btu
or 54 Btu per sq. ft. 60,840 Btu
FOR ELECTRIC ELEMENTS 80%: 48,672 Btu or 14,28 kW
TO BE ADDED:House 1 1/2 floor = 25%
House 2 floors = 40%
BEDROOM (for example: 12 x 12)
12 x 12 x 8: 1,152 cu. ft. x 1.8 Ch. air/hr: 2,074 Btu
Exposed walls:
12 + 12 x 8: 192 x 22: 4,224 Btu
Windows:
3 x 4 x 60 720 Btu
7,018 Btu