Blaze King APEX CBT Owner's manual

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Pour la version française de nos manuels S.V.P. vous référez à notre site web: www.blazeking.com
APEX cbt
SOLID FUEL CATALYTIC FURNACE
For use as an add-on to electric, gas, or oil furnaces
or and independent wood furnace when equipped
with a blower.
INSTALLER: PLEASE LEAVE THIS MANUAL WITH THE CUSTOMER
CUSTOMER: PLEASE KEEP MANUAL FOR FUTURE REFERENCE
USERS’
INSTALLATION
OPERATION &
MAINTENANCE
MANUAL
SAVE THESE INSTRUCTIONS
INSTALLER—PLEASE FILL IN:
SERIAL NUMBER……………………...

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INTRODUCTION 3
SPECIFICATIONS 4
PRODUCT INFORMATION 5-6
CERTIFICATION LABEL 7
SAFETY PRECAUTIONS 8
INSTALLATION INSTRUCTIONS 9-15
INSTALLATION INSTRUCTIONS—VENTING 15-19
INSTALLATION INSTRUCTIONS—COMBINATION WITH ELECTRIC 22-23
INSTALLATION INSTRUCTIONS—COMBINATION WITH GAS/OIL 24-25
INSTALLATION INSTRUCTIONS—WOOD ONLY 26
VB1000 BLOWER (for wood only system) 27
OPERATION INSTRUCTIONS 28-32
MAINTENANCE 33-35
CREOSOTE 36
REPLACEMENT PARTS 38-39
COMBUSTER MAJOR CLEANING PROCEDURE 40-42
LIMITED WARRENTY 43-44
NOTES 45
BRICK LAYOUT 37
INDEX

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To Our Valued Customers
Dear Customer:
Thank you for purchasing a the Blaze King APEX CBT catalytic wood burn-
ing furnace (hereafter referred to as "furnace").
This owner's manual explains the steps required to safely assemble, install,
operate, and maintain your new furnace. Be a responsible furnace owner;
carefully read these requirements for safe installation and proper operation
BEFORE installing and using your furnace.
Obtain permits from the Building Inspector or Fire Department, if local laws
require. Check local building and fire codes before installing your furnace.
When you have completed the installation, have it checked by your local in-
spector. Disregarding inspection and code requirements may jeopardize your
homeowner's insurance. Since some insurance carriers require notification
of a furnace installation, contact your insurance agent. We want your Blaze
King to give you a lifetime of trouble-free operation.
While we have made every effort to make these instructions as complete as
possible, some installation or operating conditions may not be covered. If
you have any questions that are not answered here, contact your Blaze
King dealer, Local Building Inspector, Fire Department, or our customer
service department at Blaze King, Walla Walla, WA [phone] or in
Canada 250-493-7444.
The Management and Employees of
Blaze King Industries
INTRODUCTION

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Model APEX CBT (catalytic)
Rating 48,000 Btu/hr output*
Height 40"
Width 26 1/2"
Length 48"
Flue collar 7" I.D.
Flue pipe center to rear 10 3/16"
Recommended flue draft .05" water column
Hot air plenum opening 25 3/4" L x 24" W
Fire door opening 12" x 13"
Firebox length 27"
Width 16"
Height 24"
Capacity 6 cu. ft.
Fuel length 26"
Firebox design features Catalytic with post burn preheated
secondary air.
Construction 12 ga. Firebox brick & cast lined
20 ga. Insulated cabinet
Weight 550 lbs.
*Average output from B415 emission run, Higher Btu’s achievable depending on wood size and moisture
content, geographic location, time between reloading, installation (draft).
SPECIFICATIONS

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PRODUCT INFORMATION
Appliance Dimensions
Fig. 1

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PRODUCT INFORMATION
Cutaway view
Flame shield
SS Combustor shield
Combustor Bypass
door
Damper
motor
Cast
liner
Firebricks
Damper
motor
Power
outage levers
Primary
Combustion
air
Secondary
Combustion
air
SS intake
plate
Door shield
Loading
door

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OMNI LABEL INCL. B415 Info. Gr/hr and efficiency

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 Installation is to be performed by a qualified installer
 Comply with all local codes and regulations.
 Never operate a furnace that has been improperly installed.
 DO NOT USE CHEMICALS OR FLUIDS TO START OR FRESHEN A FIRE. Keep all flam-
mable fluids well away from the furnace.
 RISK OF FIRE OR EXPLOSION - DO NOT BURN GARBAGE, GASOLINE, NAPHTHA,
ENGINE OIL, OR OTHER INAPPROPRIATE MATERIALS.
 Combustible materials, including fire wood, must not be stored within the furnace in-
stallation clearances or within the space required for fueling, ash removal, and other
routine maintenance operations.
 Never operate the furnace unless you are sure the smoke pipe and chimney are in safe
condition. Flue gasses may contain carbon monoxide which is poisonous.
 Keep smoke pipe and chimney clean to prevent a chimney fire. Inspect and clean flues
and chimney regularly. In the event of a chimney fire turn down all thermostats and
close off combustion air. Call a fire department if necessary. Have a clearly under-
stood plan to handle a chimney fire.
 CAUTION: CLEANOUT OF THE HEAT EXCHANGER, FLUE PIPE, CHIMNEY, AND
DRAFT INDUCER IF USED, IS ESPECIALLY IMPORTANT AT THE END OF THE HEAT-
ING SEASON TO MINIMIZE CORROSION DURING THE SUMMER MONTHS, CAUSED
BY ACCUMULATED ASH.
 CAUTON: Hot Surfaces
- Keep children away
- Do not touch during operation
- Maximum draft marked on nameplate
SAFETY PRECAUTIONS

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GENERAL
INSTALLATION IS TO BE PERFORMED BY A QUALIFIED INSTALLER
Please take time to read these instructions thoroughly. Not following the instructions could
result in a faulty installation causing serious problems. Along with these general instructions
you must follow the specific instructions which pertain to your particular installation i.e.: add-on
to electric, gas, oil or independent installations.
FREIGHT DAMAGE
This product was carefully inspected before it left Blaze King. Inspect the unit thoroughly upon
its arrival. If damage is found report it to the carrier and then immediately file a freight damage
claim. Your local Blaze King dealer will assist if required.
PARTS INCLUDED WITH THE APEX CBT
1. 2 Fan limit controls and bracket
2. Thermostat
3. Rake
4. Ash shovel
5. Insulation strips (3 pieces)
6. Digital Combustor thermometer
7. This manual
OPTIONAL EQUIPMENT
1. Blower and cabinet for independent use (900 cfm. to 1200 cfm.), see page 27.
2. 24 volt control transformer
USAGE
The APEX CBT may be installed as follows:
1. An add-on to any of the following furnaces:
A. An electric forced air furnace rated at 15 KW to 27 KW with a minimum size fan of
900 cfm. (see page 22)
B. A forced air gas furnace with a maximum output of 120,000 btu. and a minimum
size fan of 900 cfm. (see page 24)
C.An oil furnace having an oil input as shown on the nameplate of not more than 1.2
usgph. and a fan capacity of not less than 900 cfm. (see page 24)
2. As an independent forced air wood furnace equipped with a blower of not
less than 900 cfm. Capacity (see page 26).
INSTALLATION INSTRUCTIONS

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CAUTIONS
1. All installations must comply with local building safety codes.
2. Installation shall be by a licensed, qualified installer experienced in heating equipment installations.
3. THE WOOD SECTION MUST BE VENTED INTO A CHIMNEY APPROVED FOR SOLID FUEL USE
IN GOOD CONDITION. MOST GAS FURNACES ARE VENTED INTO "B" VENTS, THIS IS UNAC-
CEPTABLE FOR SOLID FUEL APPLIANCES. THE APEX CBT MUST NOT BE VENTED INTO ANY
TYPE OF CHIMNEY THAT ALSO SERVES ANOTHER APPLIANCE.
4. DO NOT CONNECT THE DUCT WORK SO REVERSE OR PARALLEL FLOW IS POSSIBLE.
5. DO NOT RELOCATE ANY OF THE CONTROLS ON THE ORIGINAL OR ALTERNATE FURNACE.
6. Ensure that all existing or alternate furnace systems are in good operating condition before installing
the add-on. Always maintain required clearances from the existing or alternate furnace.
7. The warm air supply duct system need to be constructed of metal in accordance with NFPA 90B,2-1.1
8. The plenums installed to the furnaces need to be constructed of metal in accordance with NFPA 90B,2-
1.3
Blaze King supports the WETT ( Wood Energy Technology Transfer Inc, Canada) & NFI
(National Fireplace Institute, USA). These organizations provide training and certification
for personnel involved in installation and maintenance of wood heating systems.
If the furnace sits on a combustible floor, a non-combustible shield must be used underneath the
furnace and extending 18 in. out from the charging end and 8 in. on either side of the fuel-loading
door. A non-combustible shield is also required underneath the chimney connector and extending
at least 2 in. on either side of the chimney connector. (minimum size floor protector= 65” x 31.5”)
This floor protection is required to prevent sparks from falling onto the combustible floor. See CSA
B365-M87). It is not required to be a heat protective covering.
This furnace must be installed in compliance with all local codes and regulations.
INSTALLATION INSTRUCTIONS
These clearances are minimum clearances to combustibles.
Always maintain sufficient space for servicing, access to flue
pipe etc.
WOOD CHARGING END (DOOR) 48 IN. (1220 MM)
ONE SIDE (A) 6 IN. (150 MM)
OTHER SIDE 18 IN. (460 MM)
BACK (B) 3.5 IN. (90 MM)
PLENUM & FIRST 2 FT (0.6 M) OF DUCT 1 IN. (25 MM)
FLUE (D*) 10* IN. (250 MM)
FLUE (C) 18 IN. (460 MM) IN CANADA
16 IN. (410 MM) IN USA
*check with local codes, 18” may be required for single wall pipe*
Fig. 1a
CLEARANCES TO COMBUSTIBLES

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INSTALLATION INSTRUCTIONS
LOCATION FURNACE
The Apex CBT is intended to be installed in a basement, the Apex is NOT approved for a
counter flow installation. Ceiling height of the furnace room needs to be a minimum of
6’ 6”(1.98 M). Hot air Plenum and Ductwork can only run Horizontally or Up,
NEVER down.
The APEX CBT can be located on either side of the alternate furnace. Minimum size of the in-
terconnect duct is 12 in. x 17 in. Typical installations see fig. 3.
The interconnect duct opening can be cut on either side of the Apex CBT, depending where
the existing or alternate furnace is located. Cut the opening max. 1 1/2 inches from the floor
and locate close to the front, about 8” (Distance A, see fig. 4 ).The side panel can be taken of
for easier cutting.
Note the bypass handle is located on the left side of the Apex, but can be moved to the right
side, this might be required in some installations to clear return air plenum or counter flow ex-
isting or alternate furnace. See page 14 for instructions.
Fig. 1b
Always maintain sufficient space for servicing unit & accessing fluepipe for cleaning.
Can be as little as 6” but 8” is recommended for easier access to the bypass handle

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INSTALLATION INSTRUCTIONS
Fig. 3 Typical installation illustration
MP80
HOT AIR TO HOUSE
ALTERNATE
HOT AIR
PLENUM
GAS, OIL
ELECTRIC
UP FLOW
FURNACE
EXISTING
MP80
RETURN
AIR
PLENUM
HOT AIR SUPPLY
PLENUM
COUNTER/
FLOW GAS
ELECTRIC
OR OIL
TYPICAL ADD ON SYSTEM
LAYOUT
(80FIG1)
WOOD COUNTERFLOW
INSTALLATION REQUIRES
NOTE
IN THIS CONFIGURATION
SPECIAL CLEARANCES APPLY
SEE CF6KIT INSTRUCTIONS.
DO NOT INSTALL IN THIS
CONFIGURATION WITHOUT
USING THE CF6KIT.
CF6 KIT OPTION
ALTERNATE
HOT AIR
PLENUM
GAS, OIL
ELECTIRC
UP FLOW
FURNACE
HOT AIR TO HOUSE RETURN
AI
R
PLENUM
COUNTER/
FLOW GAS
HOT AIR TO HOUSE
MP80
MP80
ELECTRIC
OR OIL
12”x 17”
12”x 17”
APEX
CBT APEX
CBT
APEX
CBT APEX
CBT
PROHIBITED
35 KIT
WARNING:
Hot air Plenum and Duct-
work can only run Horizon-
tally or Up, NEVER down.

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Apex CBT as independent furnace:
When the blower is installed on the left side of the Apex CBT, the bypass handle needs to be moved to
the right side (see page 14), so if possible, install the blower on the right side.
Install the blower more to the front of the unit as that is where most of the heat is. When using the
VB1000 blower cut an opening 13 1/4” W x 11 13/16” H in the side panel about 9” from the front
(Distance A, see fig. 4 ). Check the height of the hole with the blower. The side panel can be taken off, it
might be easier to cut the opening that way.
DO NOT USE INTERCONNECT DUCT ELBOWS THAT HAVE AN INSIDE RADIUS OF LESS
THAN 6" (150mm.). THE WARM-AIR SUPPLY OF THE APEX FURNACE SHALL NOT BE
CONNECTED TO THE COLD-AIR RETURN INLET OF THE EXISTING OR ALTERNATE
FURNACE. THE POSSIBILITY EXISTS THAT THE COMPONENTS OF THE EXISTING OR
ALTERNATE FURNACE MAY OVERHEAT, CAUSING THE CENTRAL FURNACE TO
OPERATE OTHER THAN INTENDED.
COMBUSTION AIR
Insure adequate combustion air allowing for all other exhausting type appliances in the dwelling (range
hoods, dryers, etc). In airtight houses it is recommended to install a fresh air inlet into the basement
room where the furnace is located.
INSTALLATION INSTRUCTIONS
NOTE: After interconnect duct opening has been cut into the side of the Apex CBT, insulation must be
fastened back to the furnace cabinet all around the opening. Use the metal strips provided to hold the
insulation tightly against the cabinet inside. This will prevent the insulation from dislodging due to blower
induced vibration. (see fig.5 below)
A
W
H
Metal strip
Casing
Insulation
Fig. 4 Fig. 5

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MOVE BYPASS HANDLE SYSTEM FROM LEFT TO RIGHT SIDE FURNACE
In some installations it is necessary to move the bypass handle system from the left (default) to the right
side of the furnace. This is possible by unbolting the system on the left and reinstall on the right (The
round plate on the right makes place for the bypass handle but need to be installed on the left after the
change-over) Make sure to adjust the handle position and latch so proper seal is achieved on bypass
door. Reroute wiring. Fig. 7 shows the correct mounting of the handle latches when moved to right side.
PRESSURE LOSS
Before any changes are made to the existing furnace system you must establish the working parameters
of that system. You can then insure that addition of the add-on has not degraded the operation of the
original system, and correct air flow will be maintained. Change all filters in the system to insure
maximum free air flow. Using an accurate manometer check the static pressure at the end of a typical
duct near the exit to the house. Check the static pressure in the plenum above the existing furnace also.
Pressure drop = Static pressure at furnace -(minus) static pressure at duct exit
Record the pressure drop of the original system.
Addition of the add-on furnace will add airflow resistance in the system. After installation is complete
measure the pressure drop in the same run measured before add-on installation. If the air flow has
diminished the blower speed should be adjusted to compensate. When using a belted blower the pulley
size should be changed or adjusted to speed up the blower. If the pulley size is adjusted measure the
blower motor current to insure that it is still within the motor plate specification. It may be necessary to
replace the motor with a more powerful motor. If a direct drive blower is used change to a higher motor
speed. Do not change the blower size.
INSTALLATION INSTRUCTIONS
Fig. 6 Fig. 7

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DRAFT
Draft is created by the heated air rising in the chimney system. This draft will pull fresh combustion air
into the firebox. Recommended draft is .05 in. w.c at high fire. Too little draft results in a sluggish fire
and smoking when the furnace door is opened. Too much draft (over 0.06 in. w.c.) makes it unsafe to
operate the furnace. Use a barometric control if necessary to avoid excessive draft.
DO NOT OPERATE THE APEX WITH A DRAFT OF OVER .06 INCHES WATER COLUMN. HIGHER
DRAFT LEVELS MAY CAUSE THE FIRE TO BURN OUT OF CONTROL AND CREATE A FIRE
HAZARD.
VENTING SYSTEMS
The venting system consists of a flue pipe and a chimney. These get extremely hot during use.
Temperatures inside the chimney may exceed 2000 degrees in the event of a creosote fire. To protect
against the possibility of a house fire, the flue pipe and chimney must be properly installed and
maintained. A listed thimble must be used when a connection is made through a combustible wall to a
chimney. A chimney support package must be used when a connection is made through the ceiling to
a listed prefabricated chimney. These accessories are absolutely necessary to provide safe
clearances to combustible wall and ceiling material.
This furnace may be connected to a lined masonry chimney or a listed factory built chimney suitable
for use with solid fuels and conforming to, ULC629 in Canada or UL-103HT in the USA. Do not
connect it to a chimney serving another appliance. To do so will affect the safe operation of both
appliances, and will void the furnace warranty. You must comply with the local authority having
jurisdiction and/or in Canada, CSA installation standard B365-M87.
The flue pipe must be 7” diameter, 24/26 MSG Back/Blue steel. Do not use aluminum or galvanized
steel. They cannot properly withstand the extreme temperatures of a wood fire. The flue pipe between
the furnace and the chimney should be as short and direct as possible. Blaze King recommends the
use of double wall pipe and two 45° elbows instead of a single 90° elbow. A minimum 36” rise is
recommended prior to any elbows being used.
The flue pipe must be attached to either an approved masonry chimney or one of the listed factory
built chimneys suitable for use with solid wood fuel. All joints must be tight and fastened with sheet
metal screws.
WARNING: The flue pipe is to be used only within the room, between the furnace and ceiling/
wall. Never use a flue pipe to pass through a combustible ceiling or wall. Always maintain the
minimum clearances to combustibles as required by the applicable building codes.
INSTALLATION INSTRUCTIONS - VENTING
DIGITAL MONITOR
Mount the digital monitor on either the left or right side
of the cabinet and connect thermocouple wire to the
monitor. This monitor shows the temperature of the
catalyst. Press the red button and the temperature will
be displayed for 30 minutes. When temperature is
below 500 F, “COOL” will be displayed.
Digital monitor
Thermocouple wire

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Flue pipe sections must be attached to the furnace and
to each other with the crimped end toward the furnace
(Fig. 8). This allows creosote to run into the furnace and
not onto the outside of the pipe. All joints should be
secured with three metal screws. Otherwise, in the
event of a creosote fire, the connection may vibrate
apart. Horizontal lengths of flue pipe should have an
upward slope from the furnace of 1/4 inch per foot.
CONNECTION TO A MASONRY CHIMNEY
Should the furnace be connected to a masonry chimney, the chimney should be examined for cracks, loose
mortar, other signs of deterioration, and blockage. The furnace should not be installed until it is determined
that the chimney is safe for use. Since an oversized flue contributes to the accumulation of creosote, the
size of the flue should be checked to determine that it is not too large for the furnace. For this furnace it is
recommended that the flue size should not exceed the overall area of a 7” flue (38.5 square inches). The
chimney should also be checked to assure it meets the minimum standards of the National Fire Protection
Association (NFPA) Standard 211. Following is a list of the more critical minimum requirements for a
properly constructed chimney.
1. The masonry wall of the chimney, if brick or modular block, must be a minimum of 4 inches nominal
thickness. A mountain or rubble stone wall must be at least 12 inches thick.
2. The chimney must have a fire clay flue liner (or equivalent) with a minimum thickness of 5/8 inch and
must be installed with refractory mortar. There must be at least 1/2-inch air space between the flue liner
and the chimney wall (Fig. 9). An equivalent liner might be a listed chimney liner system or other
approved material.
3. A chimney inside the house must have at least 2 inches of clearance to the combustible structure. A
chimney outside the house must have at least one-inch clearance to the combustible structure. Fire
stops must be installed at the spaces where the chimney passes through floors and/or ceiling (Fig. 10).
Remember that insulation must not contact the chimney. There must be air space around the chimney.
Insulation must be 2 inches or more from the chimney (Fig. 11).
4. A chimney must be the required height above the roof or other obstruction for safety and for proper draft
operation. The requirement is that the chimney must be at least 3 feet higher than the highest point
where it passes through the roof and at least 2 feet higher than the highest part of the roof or structure
that is within 10 feet of the chimney, measured horizontally (Fig. 12).
Minimum 2” clearance for
interior chimney
Fig.8 Flue Gas Direction
Fig. 9 Masonry Chimney Construction
Fig.10 Fire Stopping
INSTALLATION INSTRUCTIONS - VENTING
½” Air Space
⅝” Fireclay
Flue Liner
Chimney Wall
4” (Nominal)
Flue
Foundation

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THIMBLE
A thimble must be used when the connection from the furnace is made
through a combustible wall to a masonry chimney. There are several
methods to use for connection through a combustible wall, two of which
are illustrated in this manual. Local building authorities may be consulted
or NFPA 211 may be used for additional methods of chimney
connection.
Also, listed prefabricated metal thimbles may be purchased for use with
wood furnaces. The manufacturer's installation instructions for the
thimbles must be strictly followed to assure the safety of the system. Be
sure to maintain the designated clearance to combustible materials.
BRICK CHIMNEY THIMBLE ASSEMBLY
Construction of the brick thimble assembly requires 12 inches of brick around a fire clay liner. Be sure the
point of penetration allows an 18 inch clearance from the
connector to the ceiling. An appropriate opening for a chimney
connector must be cut in the wall to maintain the required 12
inches of brick separation from combustibles. It will be
necessary to cut wall studs and install a header and sill frame to
maintain proper dimensions and to hold the weight of the brick
(Fig. 13). NOTE: Whenever cutting through a wall, check first
with local building authorities to be sure building integrity is
maintained. Minimum 3 1/2-inch (4-inch nominal) thick solid
bricks are to be used. The fire clay liner (ASTM C35 or
equivalent), minimum 5/8 inch wall thickness, must not
penetrate into the chimney beyond the inner surface of the
chimney flue liner and must be firmly cemented in place. If it is
necessary to cut a hole in the chimney liner, use extreme care to
keep it from shattering. Refractory mortar must be used at the
junction to the chimney liner (Fig. 14). After the assembly is
complete, insert the chimney connector in the fire clay liner. Do
not push it beyond the inside edge of the chimney liner because
this will affect the draw of the chimney.
Fig. 11 Clearances—Masonry To Combustibles
Fig. 12 Minimum Chimney Height
12"
Fig. 13 Brick Chimney Thimble
INSTALLATION INSTRUCTIONS - VENTING

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PREFABRICATED CHIMNEY WITH METAL CHIMNEY SUPPORT AS THIMBLE
For the method of installation to a masonry chimney, it will be necessary to purchase a 12-inch long
section of prefabricated listed chimney to use as a thimble. Purchase a wall spacer, trim collar and wall
band that are manufactured to fit the chimney section you purchase.
The safety features of this system are: the 2-inch air space between the chimney section and
combustible wall, and the 1-inch air space around the chimney connector as it passes through the
chimney section to the chimney.
The location of the opening through the wall to the chimney must leave a minimum 18 inch vertical
clearance between the flue pipe and the ceiling to prevent the ceiling from catching fire.
For instructions on installation of the thimble, refer to chimney manufacturer's instructions.
If an exterior masonry chimney is
used you may have draft problems
due to the chimney being too cold.
Exterior masonry chimney’s
should be lined with a listed
stainless steel liner for better
operation of these units.
Fig. 15 Metal Prefabricated Thimble
Fig. 16 Metal Prefabricated Thimble
INSTALLATION INSTRUCTIONS - VENTING

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CONNECTION TO A METAL PREFABRICATED CHIMNEY
When a metal prefabricated chimney is used, the manufacturer's installation instructions must be followed
precisely. You must also purchase (from the same manufacturer) and install the ceiling support package
or wall pass through and "T" section package, fire stops (when needed), insulation shield, roof flashing,
chimney cap, etc. Maintain the proper clearance to the structure as recommended by the manufacturer.
This clearance is usually a minimum of 2 inches, although it may vary by manufacturer or for certain
components.
There are basically two methods of metal chimney installation. One method is to install the chimney inside
the residence through the ceiling(s) and the roof. The other method is to install an exterior chimney that
runs up the outside of the residence (not recommended). If it is necessary to run the chimney outside,
build an outside chase around the chimney.
The chimney must be the required height above the roof or other obstruction for safety and for proper draft
operation. The requirement is that the chimney must be at least 3 feet higher than the highest point where
it passes through the roof and at least 2 feet higher than the highest part of the roof or structure that is
within 10 feet of the chimney, measured horizontally (Fig. 12). The height requirement is necessary in the
interest of safety and does not necessarily assure proper flue draft. Use a minimum total system height of
12 feet, measured from the furnace flue collar to the top of the chimney, not including the chimney cap.
THIMBLE
When a wall exit installation is used, a listed assembly thimble must be installed. In a roof exit installation,
the ceiling support box supplied with the manufactured chimney acts as a thimble.
REMEMBER: Follow the manufacturer's installation instructions and maintain the manufacturer's
specified clearance distances.
Install an attic insulation shield to maintain the specified clearance to insulation. Insulation in this air space
will cause a heat buildup which may ignite the ceiling joists
The “Through The Roof” method of installation requires at a minimum a ceiling support package, an
Insulation shield and roof flashing.
The “Through The Wall” method requires at a minimum a wall pass through device, a wall support
package and insulated “T” section and roof flashing.
Fig. 17 Detail Of Connection Through Roof Fig. 18 Detail Of Connection Through Wall
INSTALLATION INSTRUCTIONS - VENTING

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THERMOSTATS
Your system uses two thermostats - one to control the wood add-on and one to control the alternate furnace.
The alternate (electric, gas or oil) thermostat must be interlocked to the limit switches provided on the wood
furnace plenum (see wiring diagrams). This is to prevent the alternate furnace from operating when the
plenum temperature rises above 150°F. Thermostats should be mounted side by side on an inside wall out of
direct sunlight or other heat sources.
ELECTRICAL GENERAL
All wiring on the Apex CBT shall be fastened to the outside of the insulated cabinet surfaces only. This is to
prevent overheating by direct contact with firebox components.
Electrical installation must be done by a qualified licensed electrician, experienced in control circuit wiring.
FAN LIMIT INSTALLATION
Drill 2 holes into the front of the plenum 18” above unit. Using the bracket provided, install the fan limit junction
box assembly onto the furnace warm air plenum. All wiring must be routed on the outside of the cabinet
surface. Installation of wiring must be by a qualified electrician. See instructions for wiring diagrams which
apply to your specific installation (page 23-26).
INSTALLATION INSTRUCTIONS
Fig. 19
3.50 in 3.50 in
Ø0.80 in (3x)
TEMPLATE FOR DRILLING HOLES—CUTOUT LINES
(2x)