Blaze King APEX CBT User manual

OM-APEX E V1.06 November 19, 2012
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.
Valley Comfort Systems Inc.
1290 Commercial Way
Penticton, BC V2A 3H5
CANADA
Phone: [phone]
Fax: [phone]
Blaze King Industries
146 A Street
Walla Walla, WA 99362
U.S.A.
Phone: [phone]
Fax: [phone]
Pour la version française de nos manuels S.V.P. vous référez à notre site web: www.blazeking.com
Manufactured By
OPERATION & INSTALLATION MANUAL
Installer: Please complete the details on the back cover
and leave this manual with the homeowner.
Homeowner: Please keep these instructions for future reference.
Report # 142-S-08b-2

OM-APEX E V1.06 November 19, 2012
Page 2 APEX CBT
Table of Contents
INTRODUCTION _____________________________________________________________ 3
SPECIFICATIONS _____________________________________________________________ 4
APPLIANCE DIMENSIONS______________________________________________________ 5
PRODUCT INFORMATION _____________________________________________________ 6
CERTIFICATION LABEL________________________________________________________ 7
SAFETY PRECAUTIONS ________________________________________________________ 8
INSTALLATION INSTRUCTIONS_________________________________________________ 9
INSTALLATION INSTRUCTIONS - Venting _________________________________________ 15
INSTALLATION INSTRUCTIONS - Combination APEX-Electric _________________________ 19
INSTALLATION INSTRUCTIONS - Combination APEX-Gas/Oil _________________________ 21
INSTALLATION INSTRUCTIONS - Wood only _______________________________________ 23
VB1000 BLOWER _____________________________________________________________ 24
OPERATING INSTRUCTIONS ___________________________________________________ 25
BYPASS ............................................................................................................................................ 25
CATALYTIC MONITOR (THERMOMETER) ................................................................................. 25
FUEL ................................................................................................................................................ 25
AIR SETTINGS ................................................................................................................................ 26
THERMOSTATS .............................................................................................................................. 26
FAN OPERATION............................................................................................................................ 27
LIGHTING THE FIRE ..................................................................................................................... 27
OPERATION DURING POWER FAILURE CONDITIONS............................................................. 28
MAINTENANCE ______________________________________________________________ 29
ASHES.............................................................................................................................................. 29
CATALYTIC COMBUSTOR REPLACEMENT ................................................................................ 29
GASKET INSPECTION.................................................................................................................... 30
LOADING DOOR GASKET REPLACEMENT................................................................................. 30
BYPASS DOOR GASKET REPLACEMENT..................................................................................... 31
ADJUSTING BYPASS HANDLE ...................................................................................................... 31
CREOSOTE __________________________________________________________________ 32
BRICK LAYOUT ______________________________________________________________ 33
REPLACEMENT PARTS ________________________________________________________ 34
WARRANTY _________________________________________________________________ 36
NOTES______________________________________________________________________ 40
Manufactured By
Valley Comfort Systems Inc.
1290 Commercial Way
Penticton, BC V2A 3H5
CANADA
Phone: [phone]
Fax: [phone]
Blaze King Industries
146 A Street
Walla Walla, WA 99362
U.S.A.
Phone: [phone]
Fax: [phone]

OM-APEX E V1.06 November 19, 2012
Page 3
APEX CBT
INTRODUCTION
To Our Valued Customers
Dear Customer:
ank you for purchasing a Blaze King APEX CBT catalytic wood burning furnace (hereaer
referred to as “furnace”).
is owner's manual explains the steps required to safely assemble, install, operate, and maintain
your new furnace. Please 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 re codes before installing your heater. When you have completed the installation,
have it checked by your local inspector. Disregarding inspection and code requirements may
jeopardize your homeowner's insurance. Since some insurance carriers require notication of a
stove installation, contact your insurance agent. We want your Blaze King to give you a lifetime
of trouble-free operation.
While we have made every eort 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. In the USA please call (509)-522-2730 or in Canada
please call (250)-493-7444.
e Management and Employees of
Blaze King Industries, Inc

OM-APEX E V1.06 November 19, 2012
Page 4 APEX CBT
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 ue dra .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. .
Recommended Fuel length 26”
Firebox design features Catalytic with post burn preheated
secondaryair.
Construction 12 gauge rebox brick & cast lined
20 gauge insulated cabinet
Shipping 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 (dra).
SPECIFICATIONS

OM-APEX E V1.06 November 19, 2012
Page 5
APEX CBT
APPLIANCE DIMENSIONS

OM-APEX E V1.06 November 19, 2012
Page 6 APEX CBT
PRODUCT INFORMATION
Damper
motor
Secondary
Combustion
air Power
outage
levers
Primary
Combustion
air
Damper
motor
Loading
door
Door
shield
Bypass
door
SS Combustor shield
Combustor
SS intake plate
Firebricks
Flame shield
Cast
liner
Cutaway view

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Page 7
APEX CBT
CERTIFICATION LABEL

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Page 8 APEX CBT
SAFETY PRECAUTIONS
• 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 flammable
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 installation
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 understood 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 HEATING 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.

OM-APEX E V1.06 November 19, 2012
Page 9
APEX CBT
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 specic instructions which pertain to your particular installation i.e.: add-on to
electric, gas, oil or independent installations.
PARTS INCLUDED WITH THE APEX CBT
1. 2 Fan limit controls and bracket
2. ermostat
3. Rake
4. Ash shovel
5. Insulation strips (3 pieces)
6. Digital Combustor thermometer
7. is manual
OPTIONAL EQUIPMENT
1. Blower and cabinet for independent use (900 cfm. to 1200 cfm.), see “VB1000 BLOWER” on
page 24.
2. 24 volt control transformer
USAGE
e 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 “INSTALLATION INSTRUCTIONS - Combination APEX-Electric” on page 19)
B. A forced air gas furnace with a maximum output of 120,000 btu. and a minimum size fan
of 900 cfm. (see “INSTALLATION INSTRUCTIONS - Combination APEX-Gas/Oil” on page
21)
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 “INSTALLATION INSTRUCTIONS -
Combination APEX-Gas/Oil” on page 21)
2. As an independent forced air wood furnace equipped with a blower of not less than 900
cfm. Capacity (see “INSTALLATION INSTRUCTIONS - Wood only” on page 23).
FREIGHT DAMAGE
is product was carefully inspected before it le Blaze King. Inspect the unit thoroughly upon
its arrival. If damage is found report it to the carrier and then immediately le a freight damage
claim. Blaze King will not be held responsible for damage incurred once the product leaves our
factories.
INSTALLATION INSTRUCTIONS

OM-APEX E V1.06 November 19, 2012
Page 10 APEX CBT
INSTALLATION INSTRUCTIONS cont.
CAUTIONS
Have your gas supplier or a qualied gas tter run a gas supply line into the gas replace. e line must be
properly sized and tted according to the installation codes. Upstream of the supply connection, the tter shall
provide a manual shut-o valve.
1. All installations must comply with local building safety codes.
2. Installation shall be by a licensed, qualied 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 UNACCEPTABLE 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. e warm air supply duct system need to be constructed of metal in accordance with NFPA 90B,2-1.1
8. e 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). ese organizations provide training and certication for personnel involved in installation
and maintenance of wood heating systems.
If the furnace sits on a combustible oor, 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 oor protector= 65” x 31.5”)
is oor protection is required to prevent sparks from falling onto the combustible oor. 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.
CLEARANCES TO COMBUSTIBLES
ese clearances are minimum clearances to combustibles. Always
maintain sucient space for servicing, access to ue 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

OM-APEX E V1.06 November 19, 2012
Page 11
APEX CBT
INSTALLATION INSTRUCTIONS cont.
Always maintain sucient space for servicing unit & accessing ue pipe for cleaning.
FURNACE LOCATION
e Apex CBT is intended to be installed in a basement, the Apex is NOT approved for a counter ow
installation. Ceiling height of the furnace room needs to be a minimum of
6’ 6”(1.98 M). Hot air Plenum and Duct work can only run Horizontally or Up, NEVER down.
e APEX CBT can be located on either side of the alternate furnace. Minimum size of the interconnect duct is
12 in. x 17 in. typical installations see g. 3.
e 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 oor and locate close to the front, about
8” (Distance A, see g. 4 ). e side panel can be taken of for easier cutting.
Note the bypass handle is located on the le 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 ow on existing or alternate furnace. See
“INSTALLATION INSTRUCTIONS cont.” on page 14 for instructions.
Can be as little as 6” but 8” is recommended for easier access to the bypass handle
Fig. 1b

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Page 12 APEX CBT
INSTALLATION INSTRUCTIONS cont.
MP80
HOT AIR TO HOUSE
A
LTERNATE
HOT AIR
PLENUM
GAS, OIL
ELECTRIC
UP FLOW
FURNACE
EXISTING
MP80
RETURN
A
IR
PLENUM
HOT AIR SUPPLY
PLENUM
COUNTER/
FLOW GAS
ELECTRIC
OR OIL
TYPICAL ADD ON SYSTEM
LAYOUT
WOOD COUNTERFLOW
INSTALLATION REQUIRES
NOTE
IN THIS CONFIGURATION
SPECIAL CLEARANCES APPLY
SEE CF6KIT INSTRUCTIONS.
DO NOT INSTALL IN THIS
CONFIGURATION WITHOUT
CF6 KIT OPTION
A
LTERNATE
HOT AIR
PLENUM
GAS, OIL
ELECTIRC
UP FLOW
FURNACE
HOT AIR TO HOUSE RETURN
A
IR
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 Horizontally or Up,
NEVER down.
Fig. 3 Typical installation illustration

OM-APEX E V1.06 November 19, 2012
Page 13
APEX CBT
INSTALLATION INSTRUCTIONS cont.
Apex CBT as independent furnace:
When the blower is installed on the le side of the Apex CBT, the bypass handle needs to be moved to the right
side (see “INSTALLATION INSTRUCTIONS cont.” on 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 g.
4 ). Check the height of the hole with the blower. e side panel can be taken o, it might be easier to cut the
opening that way. Use the pre-punched cutouts if applicable.
A
W
H
Fig. 4
Fig. 5
Metalstrip
Casing
Insulation
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. Recommended intake size is 1.5 sq in2 per 1000 BTU’s.

OM-APEX E V1.06 November 19, 2012
Page 14 APEX CBT
INSTALLATION INSTRUCTIONS cont.
MOVE BYPASS HANDLE SYSTEM FROM LEFT TO RIGHT SIDE FURNACE
In some installations it is necessary to move the bypass handle system from the le (default) to the right side of
the furnace. is is possible by unbolting the system on the le and reinstalling on the right (e round plate on
the right makes place for the bypass handle but need to be installed on the le aer 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 ow will be maintained. Change all lters in the system to insure maximum free air ow. 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 airow resistance in the system. Aer installation is complete measure
the pressure drop in the same run measured before add-on installation. If the air ow 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 specication. 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.
Fig. 7
Fig. 6

OM-APEX E V1.06 November 19, 2012
Page 15
APEX CBT
INSTALLATION INSTRUCTIONS - Venting
DIGITAL MONITOR
Mount the digital monitor on either the le or right side of the
cabinet and connect thermocouple wire to the monitor. is
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.
DRAFT
Dra is created by the heated air rising in the chimney system. is dra will pull fresh combustion air into the
rebox. Recommended dra is .05 in. w.c at high re. Too little dra results in a sluggish re and smoking when
the furnace door is opened. Too much dra (over 0.06 in. w.c.) makes it unsafe to operate the furnace. Use a
barometric control if necessary to avoid excessive dra.
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
e venting system consists of a ue pipe and a chimney. ese get extremely hot during use. Temperatures
inside the chimney may exceed 2000 degrees in the event of a creosote re. To protect against the possibility
of a house re, the ue 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. ese accessories are
absolutely necessary to provide safe clearances to combustible wall and ceiling material.
is 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 aect the safe operation of both appliances, and will void the furnace
warranty. must comply with the local authority having jurisdiction and/or in Canada, CSA installation standard
B365-M87.
e ue pipe must be 7” diameter, 24/26 MSG Back/Blue steel. Do not use aluminum or galvanized steel. ey
cannot properly withstand the extreme temperatures of a wood re. e ue 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.
e ue 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.

OM-APEX E V1.06 November 19, 2012
Page 16 APEX CBT
INSTALLATION INSTRUCTIONS - Venting cont.
CONNECTION TO A MASONRY CHIMNEY
Masonry chimney***
Ensure that a masonry chimney meets the minimum
standards (NFPA) by having it inspected by a
professional. Make sure there are no cracks, loose
mortar or other signs of deterioration and blockage.
Have the chimney cleaned before the stove is
installed and operated. When connecting the stove
through a combustible wall to a masonry chimney,
special methods are needed.
In Canada,
e wall cut away is to provide 18” clearance for the
connector. e resulting space must remain empty.
A ush mounted sheet metal cover may be used on
one side only. If covers are to be used on both sides,
each cover must be mounted on noncombustible
spacers at least 1” clear of the wall.
***Blaze King recommends the use of a Stainless
steel liner, preferably insulated, inside a masonry
chimney. is to maintain proper dra and overall
better operation of the unit.
Your local dealer or local jurisdiction can provide details of approved methods of passing a chimney connector
through a combustible wall in your area. In USA, the National Fire Protection Association has minimum
standards to comply with. In Canada , this type of installation must conform to CAN/CSA-B365, Installation
Code for Solid Fuel Burning Appliances and Equipment.

OM-APEX E V1.06 November 19, 2012
Page 17
APEX CBT
INSTALLATION INSTRUCTIONS cont.
THERMOSTATS
Your system uses two thermostats - one to control the wood add-on and one to control the alternate furnace.
e alternate (electric, gas or oil) thermostat must be interlocked to the limit switches provided on the wood
furnace plenum (see wiring diagrams). is is to prevent the alternate furnace from operating when the plenum
temperature rises above 150°F. ermostats 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. is is to
prevent overheating by direct contact with rebox components.
Electrical installation must be done by a qualied 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 qualied electrician. See instructions for wiring diagrams
which apply to your specic installation.
Fig. 19
TEMPLATE FOR DRILLING HOLES—CUTOUT LINES
dia 0.8 in (2x)
3.5 in

OM-APEX E V1.06 November 19, 2012
Page 18 APEX CBT
INSTALLATION INSTRUCTIONS cont.
DAMPER MOTOR(S) CONNECTION
e damper motor opens and closes the ap which controls the combustion air. Both primary air (front of
unit) and secondary air (back of unit) are controlled by a damper motor. ere is a central connection for the
damper motors in the junction box on the side of the furnace. is connection is in later diagrams referred to as
“damper motor”. It controls both damper motors and involves a bypass switch, which prevents the primary air
damper motor from opening when the bypass is open.
NEVER CONNECT DAMPER MOTORS TO 120V. CONNECT ONLY TO 24V
To primary
air damper
To secondary air
damper motor
To bypass
switch
Damper motor connection
CONNECT ONLY TO 24V
Junction
box

OM-APEX E V1.06 November 19, 2012
Page 19
APEX CBT
INSTALLATION INSTRUCTIONS - Combination APEX-Electric
ADD-ON TO ELECTRIC FURNACE
e APEX CBT may be added to an electric furnace with heating capacity between 15KW and 30KW.
Minimum blower capacity must be at least 900 cfm. Electric furnaces approved for installation in any position
can be inverted and used in a down ow position using an adapter duct between the furnace and the add-
on as indicated in g. 3. e electric furnace may be located on either side of the APEX CBT but clearances
to combustibles must be maintained. Refer to general and pressure loss portions of this manual also (see
“INSTALLATION INSTRUCTIONS cont.” on page 14) .
If changes are made to the installation of the electric furnace they must comply with CSA Standard C22.1.
AN INTERLOCK LIMIT SWITCH MUST BE INCLUDED IN THE CONTROL CIRCUITRY
PREVENTING THE GAS FURNACE FROM OPERATING WHEN THE SYSTEM OUTPUT PLENUM
TEMPERATURE IS ABOVE 150°F. TYPICAL WIRING DIAGRAM FOLLOWS: SEE FIG 21. IF
YOUR ELECTRIC FURNACE DOES NOT HAVE AN R AND G CONNECTION SEE FIG. 22.

OM-APEX E V1.06 November 19, 2012
Page 20 APEX CBT
Fig. 21 ELECTRICAL CONNECTIONS WOOD/ELECTRIC WITH R AND G CONNECTIONS
INSTALLATION INSTRUCTIONS - Combination APEX-Electric