Central Boiler CLASSIC EDGE 350 User manual

OWNER’S MANUAL
CLASSIC EDGE 350
CLASSIC EDGE 550
CLASSIC EDGE 750
SAVE THESE
INSTRUCTIONS
(p/n 9000295 - REV. A) - 10-JUN-2015
WARNING: If the information in this manual is not followed exactly, a re or explosion may result causing
property damage, personal injury or loss of life.
– Do not store or use gasoline or other ammable vapors and liquids in the vicinity of this or any other appliance.
– WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electrical switch.
• Immediately call your gas supplier. Follow the supplier’s instructions.
• If you cannot reach your gas supplier, call the re department.
– Installation and service must be performed by a qualied installer, service agency or the gas supplier.
Portland
Oregon USA
OMNI-Test Laboratories, Inc.
Tested &
Listed By
US
OUTDOOR WOOD FURNACE
0177WB036S (12/2014)

Central Boiler, Inc. • 20502 160th Street • Greenbush, MN 56726
www.CentralBoiler.com
For parts and accessories, service or repairs, call your authorized Central Boiler dealer or heating contractor. Record
the information below for future reference.
Model Serial Number Installation Date
Dealership Name Phone Number
Owner Name
e Classic Edge outdoor hydronic heater by Central Boiler is listed by OMNI-Test Laboratories to the applicable portions of the
following standards: EPA Method 28 WHH, UL 2523-2013 Solid Fuel-Fired Hydronic Heating Appliances, Water Heaters and
Boilers, CAN/CSA-B366.1-11 Solid-Fuel-Fired Central Heating Appliance.
e Classic Edge includes two 4-foot stainless steel insulated chimney sections (6" in diameter, p/n 6500004 - Edge 350 and 550, 8" in
diameter, p/n 10508 - Edge 750). Use only stainless steel solid fuel chimneys specied by Central Boiler. Maximum draft is marked on
nameplate.
French Owner's Manual and decal set available upon request from your dealer
(Manuel d'installation en français et décalcomanies disponible sur demande auprès de votre revendeur)
CLASSIC EDGE 350 Annual Eciency Rating*: 85% (lower heating value), 79% (higher heating value)
Manufacturer's Rated Heat Output Capacity: 170,000 Btu/hr
Range**: 0 to 177,802 Btu/hr.
CLASSIC EDGE 550 Annual Eciency Rating*: 76% (lower heating value), 70% (higher heating value)
Manufacturer's Rated Heat Output Capacity: 178,000 Btu/hr
Range**: 0 to 162,170 Btu/hr.
CLASSIC EDGE 750 Annual Eciency Rating*: 78% (lower heating value), 72% (higher heating value)
Manufacturer's Rated Heat Output Capacity: 240,000 Btu/hr
Range**: 0 to 240,378 Btu/hr.
*Performance is a product of the combustion rate, combustion eciency and heat exchange eciency with a single fuel load without refueling. Results
vary based on wood species, wood quality, wood quantity and moisture content. Eciencies are determined under the same test conditions using
higher heating value, lower heating value and annual fuel utilization eciency (AFUE).
• is heater meets the 2015 U.S. Environmental Protection Agency's crib wood emission limits for wood heaters sold after May 15, 2015.
Under specic test conditions this heater has been shown to deliver heat at rates shown for the respective model above**.
• is wood heater has a manufacturer-set minimum low burn rate that must not be altered. is wood heater needs periodic inspection and
repair for proper operation. It is against federal regulations to operate this wood heater in a manner inconsistent with operating instructions in
this manual.
• DO NOT OVERFIRE THIS HEATER. Attempts to achieve heat output rates that exceed heater design specications can result in permanent
damage to the heater.
• Any person(s) operating a hydronic heater must comply with all applicable laws, including but not limited to local ordinances.
• Improper use or failure to maintain the hydronic heater may cause nuisance conditions. e person(s) operating a hydronic heater is/
are responsible for operation in a manner that does not create a nuisance condition. Meeting the setback distance and stack height
recommendations from the manufacturer and requirements in applicable State and local regulations may not always be adequate to prevent
nuisance conditions in some areas due to terrain or other factors.
• Operating an outdoor furnace may not be suitable to some individuals' abilities or lifestyles. Be sure to review the Owner's Manual for the
appliance with your dealer.
- Register at time of purchase for FREE 25 Year Limited Warranty -
Verify your warranty at: CentralBoiler.com/w25

Contents
How to Use This Guide
e guide is divided into sections
to help with the operation and
maintenance of the outdoor furnace.
If questions arise that are not
answered with this manual, consult
with your authorized Central Boiler
dealer.
CENTRAL BOILER ONLINE RESOURCES............................................................ iv
EPA RESOURCES .............................................................................. iv
Labeling and Terminology ......................................................................1
Foundation...................................................................................2
Access to Ports on Outdoor Furnace.................................................... 3
Ground Rod Kit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Furnace Installation - Connecting to Your Existing System ................................ 4
Chimney Recommendations.......................................................... 7
Important Precautionary Information ................................................. 8
Wood Selection and Preparation ..................................................... 10
Importance of Properly Seasoned Wood .........................................................11
Operating Instructions ............................................................. 12
FIRESTAR CONTROLLER ........................................................................12
Operating the Classic Edge for Maximum Eciency and Performance ................................12
Air Flow and Maintaining the Coal Bed ..........................................................14
Ash Removal Frequency .......................................................................14
Cold Start Firing..............................................................................14
Adding Heat Load ............................................................................16
AddingWood - Best Practices for Frequency and Amount...........................................17
Why a 12-Hour BurnTime? ....................................................................20
Maintenance...................................................................... 21
Control Locations.............................................................................22
ROUTINE MAINTENANCE.......................................................................22
MAINTENANCE SECTIONS ......................................................................23
WATER QUALITY AND MAINTENANCE .................................................. 39
Water Test Kits and Test Results.................................................................39
Testing Supply Water .........................................................................40
Corrosion Inhibitor Plus™ and InitialTreatment ...................................................40
Testing TreatedWater in the Outdoor Furnace.....................................................41
SYSTEM MAINTENANCE .......................................................................42
POST HEATING SEASON MAINTENANCE...........................................................43
Flushing the System ..........................................................................43
FIREBOX DOOR HINGE / LATCH BEARING ADJUSTMENT..............................................44
FIREBOX DOOR SEAL ..........................................................................45
REACTION CHAMBER DOOR SEAL................................................................46
CIRCUIT BREAKER ............................................................................47
SOLENOID ...................................................................................48
SECONDARY AIR CHARGE TUBE AND REFRACTORY MODULES.........................................49
THERMOCOUPLE .............................................................................50
TROUBLESHOOTING ................................................................ 51
GENERAL TROUBLESHOOTING INFORMATION......................................................51
TROUBLESHOOTING OTHER SITUATIONS ..........................................................54
GENERAL INFORMATION............................................................. 62
Make note of these precautionary statements, also found on the outdoor furnace. .....................62
WIRING DIAGRAM.................................................................. 63

CLASSIC EDGE OUTDOOR FURNACE • OWNER'S MANUAL
CENTRAL BOILER ONLINE RESOURCES
Enter CentralBoiler.com in your browser or scan the code using any QR code reader app on your smartphone to access Central
Boiler's library of information to help with installation, operation and maintenance of your Central Boiler outdoor furnace.
Detailed Furnace Installation Variations - http://www.CentralBoiler.com - go to Explore > Furnace Installation
View and/or download PDFs to assist in installation of your outdoor furnace. Information and examples
regarding pumps, foundations, chimneys and support structures, ermoPEX piping, and example congurations
for a variety of heating congurations.
Product Service Videos - http://www.CentralBoiler.com - go to Explore > Videos
Push-t Fittings
Central Boiler's push-t ttings make conguring and connecting your
heating system easy and quick.
Performing a Water Test
Testing and maintaining the water in your system is critical for the
operation and longevity of your heating system.
EPA RESOURCES
EPA's Burnwise Program - http://www.epa.gov/burnwise
How to Use a Moisture Meter Video - http://www.youtube.com/watch?v=jM2WGgRcnm0
EPA oers tips on how to properly use a moisture meter to test rewood before using in a wood-burning stove or replace. Wet wood can create
excessive smoke which is wasted fuel.
Split, Stack, Cover and Store Video - http://www.youtube.com/watch?v=yo1--Zrh11s
EPA oers four simple steps to properly dry rewood before using in a wood-burning stove or replace. Wet wood can create excessive smoke
which is wasted fuel. Burning dry, seasoned rewood with a moisture content of 20% or less can save money and help reduce harmful air
pollution.
Wet Wood is a Waste brochure - http://www.epa.gov/burnwise/pdfs/wetwoodwastebrochure.pdf
is tri-fold brochure provides colorful illustrations of the four easy steps to dry rewood.
NOTE: The warranty can be voided by operating a residential hydronic heater in a manner inconsistent with the Owner's Manual.
INSTALLATIONS IN MASSACHUSETTS:
1. All installation components must be products approved in the Commonwealth of Massachusetts by the Gas and Plumbing Board.
2. e maximum run of tubing from the water heater to a fan coil is 50 linear feet.
3. Persons operating this hydronic heater are responsible for operation of the hydronic heater so as not to cause a condition of air pollution as
dened in 310 CMR 7.01(1).
Videos to supplement the Owner's Manual are available at
www.youtube.com/centralboilerinc
Watch tips on initial startup, testing system water and more.

1
CLASSIC EDGE OUTDOOR FURNACE • OWNER'S MANUAL
Labeling and Terminology
e outdoor furnace and this installation guide use the following terms and
symbols to bring attention to the presence of hazards of various risk levels and
important information concerning the use and maintenance of the outdoor
furnace.
This symbol and text indicate an imminently hazardous situation which, if ignored,
will result in death or serious injury.
This symbol and text indicate the presence of a hazard which can cause severe personal
injury or death to an operator or bystander, or substantial property damage if ignored.
CAUTION
This symbol and text indicate the presence of a hazard which can cause minor personal
injury or property damage if ignored.
NOTE: Indicates supplementary information worthy of particular attention relating
to installation, operation, or maintenance of the outdoor furnace but is not related to a
hazardous condition.
Be sure to follow all instructions and related precautions as they are meant for
your safety and protection. Store this manual in a readily accessible location for
future reference.
Classic Edge 350 Measurements
A B C D E F G IH
cm
in.
- Measurement (G) includes two 4 ft (1.2 m) chimney sections.
- All measurements are approximate
- Measurement (F) is from firebox door to chimney inspection cover.
Classic Edge 550 Measurements
A B C D E F G IH
cm
in.
Classic Edge 750 Measurements
A B C D E F G IH
cm
in.
© 2015 Central Boiler
C
A
I
B
D
H
G
E
F
40.5 72 50.75 43 51.5 5 3869 150
103 183 129 109 131 13 97175 381
42.5 76 55.5 45 56 5 37.573.5 151
108 193 141 114 142 13 95187 384
51 84.75 59.75 53.5 60.5 5 3979 164
130 215 152 136 154 13 99201 417

2CLASSIC EDGE OUTDOOR FURNACE • OWNER'S MANUAL
Foundation
e outdoor furnace may be installed directly on stable, level ground without
the necessity of a foundation, although installing the outdoor furnace on a
foundation oers many advantages. e outdoor furnace is less likely to move
due to frost heaving. A foundation keeps the area directly around the outdoor
furnace free of standing water and can help to keep unwanted pests out. It can
also raise the furnace up to provide a more comfortable height of the rebox
door opening.
If the ground is unstable, one option is to use patio blocks under the perimeter
of the base. Another option is to pour a concrete foundation.
To install the outdoor furnace on a concrete foundation, refer to the illustration
for dimensions and for the location of the hollowed-out area for each model. A
4" to 6" (10 to 15 cm) thick concrete slab works well; however, a thicker slab
may be used to obtain the desired door opening height.
If the area for the concrete slab is unstable and/or aected by frost heaving,
consider installing 2" closed-cell insulation beneath the front portion of the
slab and under the area of the ground used for walking.
CAUTION
Do not use any combustible materials for the foundation.
NOTE: The installation surface or foundation must be noncombustible. The hot supply and
return lines must also be protected from possible exposure to sunlight, re or physical
damage that may be caused by an occurrence outside the outdoor furnace enclosure.
Foundations may consist of concrete, crushed rock or patio blocks.
Do not use any combustible
materials for the foundation.
CAUTION
© 2015 Central Boiler
Outdoor furnace must be installed on a noncombustible surface or foundation that incorporates an enclosure
that will prevent supply and return lines from possible exposure to sunlight, fire, or physical damage that may be
caused by an occurrence outside the outdoor furnace enclosure. Foundation may consist of concrete, crushed
rock, or patio blocks.
Recommended maintenance clearances
2" rigid foam insulation (optional)
Foundations dimensions are 1-1/2" (4 cm) beyond the outside perimeter of the base.
54"
(137 cm)
Classic Edge 350
(Foundation Optional)
43.5"
(110 cm)
72"
(183 cm)
12"
Optional Concrete
Maintenance Area
Optional Concrete
Maintenance Area
Optional Concrete
Maintenance Area
(31 cm)
12"
(31 cm)
72"
(183 cm)
7"
(18 cm)
11"
(28 cm)
Front
24"
(61 cm)
58.5"
(149 cm)
Classic Edge 550
(Foundation Optional)
45.5"
(116 cm)
72"
(183 cm)
12" (31 cm)
12"
(31 cm)
72"
(183 cm)
7"
(18 cm)
11"
(28 cm)
Front
24"
(61 cm)
63"
(160 cm)
Classic Edge 750
(Foundation Optional)
54"
(137 cm)
72"
(183 cm)
12" (31 cm)
12"
(31 cm)
72"
(183 cm)
7"
(18 cm)
11"
(28 cm)
Front
28"
(71 cm)
Wonder Bar
Hoe
Cleaning Rod
Tools
Included with each new furnace
are tools that are invaluable for
maintenance and cleaning. Use
the hoe to clean the rebox and
to remove ash from the Reaction
Chamber. e Wonder Bar® is used
for scraping the rebox and the door
frame. e cleaning rod can be used
to break up heavy or solidied ash in
the rebox. It is also used to cycle the
heat exchanger integrated cleaning
system to remove ash from the heat
exchangers.
Refer to the Maintenance section for
more information.

3
CLASSIC EDGE OUTDOOR FURNACE • OWNER'S MANUAL
Access to Ports on Outdoor Furnace
Ports are provided that allow mounting circulation pumps on the outdoor
furnace. Refer to the illustrations in this section for proper supply and return
line and pump installations for your model.
NOTE: The Installation Guide provides more information on pump selection. For even more
detailed information, see the Hydronic Component Selection Guide (p/n 2482), available
from your Central Boiler dealer.
171
418
388
224
1330
5926
118
118 118
296 296
418
5926
1330
1330
PEX Pipe
3/4" Return Side View
2 - Pump Parts Lists*
For 3/4" (1" PEX) system
411
118
388 388
198 198
5000015
5926
6 118 Close Nipple, 3/4"
2 418 Tee, Black, 1-1/4"
2 171 007 Pump
4 388 Bushing, 1-1/4" x 3/4"
2 198 Ball Valve, 3/4"
2 224 Isolation Flange, 3/4"
2 296 Swing Check Valve,
3/4"
2 556 Power Supply Cord
4 1330 MPT to PEX, 3/4" x 1"
4 5926 Stainless Steel Clamp
Crimp Ring, 1"
1 411 90˚ Elbow, 1-1/4"
1 5000016 90˚ Elbow, Black,
1-1/4"
1 6593 Grounding Rod Kit
3 5000015 Nipple, 1-1/4" x 2-1/2"
*Parts and accessories sold separately.
Pump size may vary.
For illustration purposes only
118
5000015
5000016
556
*Parts and accessories sold separately.
Pump size may vary.
For illustration purposes only
3/4
3/4
3/4
3/4"
Port
3/4"
Port
1-1/4"
Port
Return Side View
For illustration purposes only.
118
1330
PEX Pipe
296*
Swing Check
Valve
198
6054
6764
5000018
224
388
388
171
1330
5926
556
3042
5926
3/4
Power disconnect/circuit breaker
shuts off all power excluding outlet.
Central Boiler recommends
installing swing check valves on the
return lines to eliminate reverse flow.
p/n Description
3 - Pump Parts List*
Qty
3 118 3/4" Close Nipple
3 171 007 Pump
3 198 3/4" Ball Valve
3 224 3/4" Isolation Flange Kit
3 296 3/4" Swing Check Valve
2 388 1-1/4" x 3/4" Bushing
3 5000018 3/4" x 3" Nipple
3 556 Power Supply Cord, 32"
1 582 6-Outlet Converter
6 1330 3/4" x 1" MPT to PEX
3 3042 1/2" x 1/8" Bushing
3 6054 Temperature Gauge
3 6764 3/4" x 3/4" x 1/2" Offset Tee
6 5926 Stainless Steel Clamp
Cring Ring, 1"
556 171
224
5000018
388
388
118
118
118
180
6054
5926
133
1330
PEX Pipe
3/4" Return Side View
1 - Pump Parts Lists*
For 3/4" (1" PEX) system
198
296
3 118 Close Nipple, 3/4"
1 133 Tee NPT, 3/4"
1 388 Hex Bushing,
1-1/4" x 3/4"
1 171 007 Pump
1 180 Bushing, 3/4" x 1/8"
1 198 Ball Valve, 3/4"
2 224 Isolation Flange, 3/4"
1 296 Swing Check Valve,
3/4"
1 556 Power Supply Cord
1 1330 MPT to PEX, 3/4" x 1"
2 5926 Stainless Steel Clamp
Crimp Ring, 1"
1 6054 Temperature Gauge
1 6593 Grounding Rod Kit
1 5000018 Nipple, 3/4" x 3"
*Parts and accessories sold separately.
Pump size may vary.
For illustration purposes only
Classic Edge 350 / 550 Models – 2-Pump Conguration*
Classic Edge 750 Model – 3-Pump Conguration
Classic Edge 350 / 550 Models – 1-Pump Conguration
*Pump Extension Kit (p/n 2500164) required.

4CLASSIC EDGE OUTDOOR FURNACE • OWNER'S MANUAL
Ground Rod Kit
e outdoor furnace must be electrically bonded to ground in accordance with
the requirements of the authority having jurisdiction or, in absence of such
requirements, with the National Electrical Code, ANSI/NFPA 70 and/or the
Canadian Electrical Code Part 1, CSA C22.1 Electrical Code.
Install a Ground Rod Kit (p/n 6593) and connect it to the outdoor furnace.
1. In the water line trench near the outdoor furnace, drive the ground rod
into the ground until the top of the ground rod is below the ground
surface.
2. Route the ground wire from the ground rod under the outdoor furnace
base and over to the frame of the outdoor furnace.
3. Secure the ground terminal with a cap screw (1/4" x 3/4"), star washer
and nut. Secure the ground wire to the terminal; then secure the ground
wire to the ground rod with the clamp. Tighten all hardware securely.
NOTE: A hole for the ground terminal has been pre-punched in the outdoor furnace base
near the pumps.
Furnace Installation - Connecting to Your Existing System
A common installation is to connect the outdoor furnace to an existing water
heater and then to an existing forced air system. A water-to-air heat exchanger
is mounted in the plenum or duct work of the existing furnace. Heated water
from the outdoor furnace either continuously ows through the water-to-air
heat exchanger or is diverted through a 3-way zone valve. When the thermostat
senses the need for heat, the fan on the existing furnace forces air through the
heat exchanger, transferring heat throughout the existing ductwork.
NOTE: There are numerous ways to connect to your heating system. Refer to the Central
Boiler Outdoor Furnace Installation Guide for other installations.
Detailed Furnace Installation Variations
Visit CentralBoiler.com to access
a library of detailed illustrations
for connecting to a wide variety of
existing heating systems and for
other heating options.

5
CLASSIC EDGE OUTDOOR FURNACE • OWNER'S MANUAL
H
C
M
R
Hot Supply
Water-to-Water
Heat Exchanger
Bypass Line
Thermostatic
Mixing Valve
This horizontal assembly
must not exceed a height
of 4 inches (10 cm) above top
of water heater.
Existing
Water
Heater
1"
Central
PEX®
Optional Bypass
Valve
Heat
Exchanger
Plenum
Existing
Forced Air
Furnace
For illustration purposes only,
water heater styles may vary.
NOTE
A pump must be installed in the hot
supply line between the outdoor furnace
and thermostatic valve. Outdoor furnace
water temperature setpoint should be
set at 185˚F (85˚C) minimum.
NOTE
Installer must comply with all
applicable codes and regulations.
NOTE
Any electrical installation should
be done by a qualified installer
in accordance with applicable
codes.
NOTE: A certified electrician must
do the electrical installation.
Typical Installation
Connecting to Water Heater and Forced Air Furnace
© 2014 Central Boiler
Hot Supply from Pump
on Outdoor Furnace
Return to Outdoor Furnace
Thermostatic Valve
To Thermal
Storage Tank
To Heating
System
From Heating
System
Hot Supply from Pump
on Outdoor Furnace
Return to
Outdoor Furnace
Remote
Thermal
Storage
Tank
For illustration purposes only;
system components may vary.
NOTE
Installer must comply with all
applicable codes and regulations.
Thermostatic
Valve
Remote Thermal Storage Installation
Connecting to Remote Thermal Storage Tank

6CLASSIC EDGE OUTDOOR FURNACE • OWNER'S MANUAL

7
CLASSIC EDGE OUTDOOR FURNACE • OWNER'S MANUAL
Chimney Recommendations
In higher populated areas, extend the chimney to a height
above the roofs of surrounding buildings. Use Central
Boiler Chimney Extensions when extending the chimney.
When only the standard eight feet (2.4 m) of chimney are
used, the sections must be secured at the connection joint
with four (4) screws to stabilize the extension.
If extensions are added to the standard eight feet
(2.4m) of chimney, the chimney should be reinforced
appropriately. e illustration shows chimney support
recommendations when three or more sections are used.
When adding sections of chimney, make sure that there
is nothing within the fall zone of the chimney that could
be damaged. If something is located within the fall zone
and cannot be removed, guy wires or braces may need
to be installed to prevent a falling chimney from causing
damage.
NOTE: If more than three 4-foot (1.2-m) sections of chimney are used, a
support (e.g., a pole, pipe or other structural support) may be installed
from the ground that can withstand wind. Other reinforcement
recommendations are shown.
NOTE: For chimney extensions or chimney replacement, use only
genuine Central Boiler chimney components. Parts are available
from an authorized Central Boiler dealer.
e installation of a spark arrester is recommended,
particularly where there are dry conditions or where
there is combustible material near the unit, unless the
installation of a spark arrester is prohibited by local
requirements. Use common sense to avoid potential res,
including exercising caution when disposing of ashes,
cleaning and refueling. Keep all highly combustible
materials (e.g., gasoline, propane, leaves, pine needles,
etc.) away from an operating unit at all times. Take special
precautions in windy conditions.
NOTE: You may need to increase the chimney height if conditions
occur that force exhaust to low levels.
Chimney Reinforcement Recommendations
Chimney
Guy-Wire
Band Kit
(p/n 778)
Fall Zone
If objects are placed in the fall zone of the chimney, a
Chimney Guy-Wire Band Kit (p/n 778) or additional bracing
is recommended.
6" Chimney Locking
Band (p/n 6500011)
Chimney
Base
Bracket
(p/n 4519)
6" Chimney Extension (p/n 6500004)
Additional bracing may be necessary in
certain areas such as those subject to severe
weather, winds, freezing rain, etc.
Inspect all bracing bi-annually for integrity.
•
•
NOTE
Five or More Sections
When five or more sections of
chimney are being used, a Chimney
Base Bracket Kit (p/n 4519) and a
Chimney Attachment Ring (p/n 774)
are recommended.
Chimney Attachment Ring (p/n 774)
Must be located directly below Chimney
Locking Band to reduce stress on the
joint.
Two 1" electrical
conduit sections
(not supplied)
Two 3/4"electrical
conduit sections
(not supplied)
Three or Four Sections
When three or four sections of
chimney are being used, aChimney
Base Bracket Kit (p/n 4519) is
recommended.

8CLASSIC EDGE OUTDOOR FURNACE • OWNER'S MANUAL
Important Precautionary Information
Be sure to read carefully and understand these precautions before, during and after the installation, operation and
maintenance of the furnace.
NOTE: All operations must be in accordance with local and state
codes which may dier from the information in this manual.
CAUTION
This outdoor furnace is not intended to be the only source of
heat. In the event of a prolonged power failure, a generator
may be used to prevent lines from freezing. Should the outdoor
furnace be left unattended, run out of fuel or require service, an
alternate heating source in the building being heated should
be in place to prevent damage caused by freezing.
The outdoor furnace vent cap must t loosely on the vent
opening. Do not force the cap down or try to seal it tightly onto
theventpipe.Donotextendor restrictthe ventpipe oropening.
DO NOT ALLOW THE OUTDOOR FURNACE TO BE PRESSURIZED.
Be sure the outdoor furnace is lled with water before ring.
Never re the outdoor furnace when the water level is more
than 1" (2.5 cm) below the FULL mark on the sight gauge.
Corrosion Inhibitor Plus™ must be added before the initial ll
(see Water Quality and Maintenance).
Disconnect the electrical power to the outdoor furnace before
replacing an electrical component.
Do not attempt service inside the electrical control panel
without rst disconnecting the electrical power at the main
power source.
NOTE: Any electrical installation should be done by a qualied
installer in accordance with applicable codes.
Allow the outdoor furnace to thoroughly cool and completely
clean out the rebox before draining water from the outdoor
furnace. If the water in the outdoor furnace ever boils, be sure
to check the water level and restore to full. If water is added,
the proper level of Corrosion Inhibitor Plus™ (p/n 1650) must be
maintained.
When cleaning the outdoor furnace, be careful not to spill any
coals.
ALWAYS store ash in a covered non-combustible container.
Do not allow combustible materials (straw, hay or wood) near
the outdoor furnace. Keep the perimeter of the outdoor furnace
clear and clean.
For re safety, keep all combustible materials at least six feet
(two meters) away from the outdoor furnace, especially around
the door area. Debris of wood chips and other combustibles in
the area may be easily ignited if a hot coal is spilled out of the
rebox and left unnoticed.

9
CLASSIC EDGE OUTDOOR FURNACE • OWNER'S MANUAL
The rebox door must be closed and latched at all times except
when lling the rebox with wood. Leaving the rebox door
open may lead to a runaway re. In the event of a runaway re,
close the rebox door. In the event of a chimney or soot re,
close the rebox door and make sure power is o to the outdoor
furnace.
All covers must be maintained at all times except during
maintenance, inspection and service.
When opening the rebox door, the door switch will shut o the
primary air solenoid and prevent the gas-red wood ignition
burner (if installed) from operating while the rebox door is
open. Do NOT disable the door switch.
Use only untreated wood in the rebox. Do not burn trash,
plastics, gasoline, rubber, naphtha, household garbage,
material treated with petroleum products (particle board,
railroad ties and pressure treated wood), leaves, paper products
or cardboard.
NOTE: The prohibition against burning these materials does not
prohibit the use of re starters made from paper, cardboard, saw
dust, wax and similar substances for the purpose of starting a re
in an aected wood heater.
NOTE: Do not use chemicals or uids to start the re. Use kindling
or gas-red wood ignition option to start an initial re.
NOTE: The sight gauge valve should always be closed, except when
checking water level. Water will automatically drain from the
sight gauge tube when the valve is closed. Remember that this
type of valve requires only 1/4 turn to open or close.
This heater is designed to burn natural wood only. Higher
eciencies and lower emissions generally result when burning
air dried seasoned hardwoods, as compared to softwoods or
to green or freshly but hardwoods. DO NOT BURN: any wood
that is not clean wood, unseasoned wood, garbage, tires,
lawn clippings, leaves, brush trimmings or general yard waste,
materials containing asbestos, materials containing lead,
mercury or other heavy toxic metals, materials containing
plastic,materialscontaining rubber, wastepetroleumproducts,
paints and paint thinners, asphalt products, chemicals, coal,
glossy or colored paper, construction and demolition debris,
plywood, particleboard, salt water driftwood and other
previously salt water saturated materials, manure, animal
carcasses and asphalt products. Burning these materials may
result in release of toxic fumes or render the heater ineective
and cause smoke.
NOTE: Chloride or sulfurous gases can be generated if plastic or
rubber is burned and will mix with the moisture from the wood
and form hydrochloric or sulfuric acids in the rebox, creating
corrosion.
NOTE: This outdoor furnace is not to be used with an automatic
stoker.
CAUTION
This outdoor furnace is not to be connected to a chimney ue
serving another appliance.
When adding wood to the rebox, be careful not to get pinched
between the wood and the door frame, or any part of the
outdoor furnace. Use extreme care with large pieces of wood
that may be dicult to handle.
Sulfuric acid in the test kit is a corrosive acid. Handle carefully.
Carefully read and follow precautions on test chemical labels.
Keep test chemicals away from children. Safely dispose of tested
samples.

10 CLASSIC EDGE OUTDOOR FURNACE • OWNER'S MANUAL
Wood Selection and Preparation
For the best results, it is best to burn seasoned split wood. However, it may be
possible to burn some unsplit wood with the split wood depending on quality,
size, moisture content and wood type. Properly seasoned wood contains less than
25% moisture by weight. It is darker, has cracks in the end grain, and sounds
hollow when smacked against another piece of wood. Most wood needs to be
split to dry down to 25% within a year. Wood between 4" and 8" (10 and 20
cm) in diameter works well in most cases. Pieces of wood that are too large can
reduce output capacity because they burn slower.
• Wood that works well in most cases:
• Is between 4" and 8" (10 and 20 cm) in diameter
• Is approximately 60-70% of the length of the rebox
• Typically weighs 10-15 pounds per cubic foot for heavy heat loads
• Pieces of wood that are too large can reduce output capacity because
they burn slower. Wood that is too long can cause bridging.
• Seasoned wood burns more eciently, minimizes the amount of
creosote formation, reduces emissions and extends the life of the
outdoor furnace.
• Maintain a quantity of smaller, drier pieces of wood for relighting the
re and for other situations when larger pieces of wood don't work as
well.
• e larger the heat load on the outdoor furnace, the drier the wood
needs to be in order to maintain an adequate glowing coal bed.
Before You Start Operating Your
Classic Edge Outdoor Wood Furnace
Be sure to read carefully and observe
all of the information in the entire
Owner's Manual.
If any questions arise that cannot
be answered by the information in
this manual, be sure to contact your
dealer.

11
CLASSIC EDGE OUTDOOR FURNACE • OWNER'S MANUAL
Following are some reasons that green, unseasoned wood should not be used:
• Green wood contains about 50% moisture by weight. Energy is
required to heat the wood and evaporate the moisture - energy which
could have been used to provide heat for the home. e illustration
below shows that burning drier, seasoned wood provides more energy
for heating your home compared with burning green, unseasoned
wood that uses more energy to evaporate the moisture and provides
less energy for heating your home.
• Unseasoned wood provides less heat, resulting in more condensates
(moisture) in the rebox and increased wood consumption.
• Increased moisture in the rebox can result in corrosion.
• Unseasoned wood causes reduced performance, lower combustion
rates and lower heat output.
• e full heating potential is unlikely to be achieved with unseasoned
wood.
• Burning wood with an excessively high moisture content increases
maintenance requirements and can lower the service life of the outdoor
furnace.
• e higher the moisture content of the wood being burned, the harder
it is to maintain a glowing coal bed because it burns more slowly.
NOTE: Do not store wood within the outdoor furnace installation clearances or within the
spaces required for fueling, ash removal and other routine maintenance operations.
Importance of Properly Seasoned Wood
Burning properly seasoned wood (less than 25% moisture content) will
minimize wood usage and maximize the eciency and performance of the
Classic Edge (see Wood Selection and Preparation in the Introduction).
In order for wood to burn, the moisture in the wood must rst be evaporated
(boiled o). e more moisture there is in the wood, the more energy it will
consume to dry it and the less energy will be available for heating the water.
As shown, the higher the moisture in the wood, the larger the volume of the
rebox that is used for drying and the smaller the volume used for burning.
is results in lower eciency and lower heat output.
e lower the moisture in the wood, the smaller the volume of the rebox that
is used for drying and the larger the volume used for burning. is results in
higher eciency and higher heat output.

12 CLASSIC EDGE OUTDOOR FURNACE • OWNER'S MANUAL
Operating Instructions
FIRESTAR CONTROLLER
Refer to the FireStar II Operator's Manual for information about the controller.
Operating the Classic Edge for Maximum Eciency and Performance
Because of its highly ecient and clean-burning design, the Classic Edge
operates dierently than other types of wood-burning devices. Understanding
a few basic principles will help you operate the Classic Edge as it was designed,
maximizing its performance, heat transfer and longevity.
NOTE: For proper operation, the fuel must match the heat load, the furnace must be
maintained to ensure proper air ow, and the water temperature must be kept above
150˚F (66˚C).
1. e combustion air fan pressurizes the airbox located at the front of the
outdoor furnace. Primary air ow, regulated by a solenoid, ows into the
rebox through combustion air outlets located on the front, sides and the
back, near the bottom. Secondary air is regulated by solenoids that allow
air ow through the secondary air charge tube. Combustion starts in the
rebox near the bottom of the wood load.
NOTE: The combustion air outlets must be visible (i.e., ash must be kept below the
combustion air outlets as shown).
Operating with Properly Seasoned Wood
Ash
Coals
Burning
Drying
Ash
Operating with Wood with Too Much Moisture
Less Coals
Less Burning
More Drying
NOTE: The larger the volume where the wood is burning and not drying, the more efficiently the outdoor furnace will be operating.
Wood in
the Firebox
Wood in
the Firebox
• Burns more efficiently
• Minimizes amount of wood used
• Reduces emissions
• Extends life of furnace
• Reduces bridging
• Burns less efficiently
• Increases amount of wood used
• Lowers combustion rates
• Increases maintenance requirements
• Increases bridging
© 2015 Central Boiler

13
CLASSIC EDGE OUTDOOR FURNACE • OWNER'S MANUAL
Combustion
Air Outlets
(one side of firebox
shown - same on
other side)
Secondary Air
Charge Tube
Keep the combustion air outlets open and clear of ash
and coals to allow the furnace to operate properly.
2. Gasied fuel exits the bottom of the rebox alongside and under the
secondary air charge tube, through the mixing channel and down to the
Reaction Chamber™. Final combustion occurs in the Reaction Chamber
where extremely high temperatures aid in complete combustion. e
chimney creates a draft (negative pressure) which helps to draw exhaust
gases from the furnace.
3. Heat is transferred to the water from the hot gases as they move through
the rebox, the Reaction Chamber and the heat exchanger.
Flow
Secondary
Air
Mixing
Channel
3" (8 cm) Max.
Coals
Ash
Ash
Reaction
Chamber
Primary
Combustion
Air Outlets
© 2015 Central Boiler
CORRECT
(Proper Flow)
Front View
NOTE: The illustration shows the Classic Edge operating correctly with proper combustion
air ow and with the wood properly loaded.

14 CLASSIC EDGE OUTDOOR FURNACE • OWNER'S MANUAL
NOTE: A key point to remember about the operation of the Classic Edge is that as wood
burns, the combustion gases ow down through the bottom of the rebox so the proper
ow must be maintained as shown.
NOTE: Refer to the General Troubleshooting Information for more information on outdoor
furnace operation and for conditions to avoid.
Air Flow and Maintaining the Coal Bed
Each time the rebox is loaded with wood, make sure that air ow through
the combustion system is not blocked or restricted. Maintain 1-3 inches (2.5
cm to 7.5 cm) of loose, glowing coals alongside the charge tube to optimize
the operation of the outdoor furnace. If the coal bed is too deep, it will restrict
air ow and limit the amount of heat output. If there is no coal bed, or if the
coal bed is too shallow, it will reduce the potential heat output, and can reduce
eciency.
Generally, the coal bed depth will increase if smaller dry wood is loaded at
more frequent intervals. If too large pieces of wood and/or wood with too high
moisture content are used, the coal bed is likely to be depleted, resulting in
reduced heat output and eciency.
Some ash in the bottom of the rebox (but not alongside the charge tube)
is necessary for the proper operation of the outdoor furnace. Ash acts as an
insulator, keeping the glowing coals in the bottom of the rebox hot enough to
restart the re when needed after being in idle mode.
Ash Removal Frequency
During the rst week of operation, check the level of ash in the Reaction
Chamber every two days. Ash needs to be removed from the Reaction
Chamber before it obstructs the combustion air ow for ecient operation.
Clean the Reaction Chamber before it becomes 1/3 full of ash (approximately
3" or 7.5 cm deep in any area of the Reaction Chamber).
If there are signicant changes in the heat load because of colder weather and
more wood is burned each day, ash will need to be removed from the Reaction
Chamber more often. Using dierent types of wood can also aect the
frequency with which ash will need to be removed.
Cold Start Firing
NOTE: These procedures apply to initial ring or refueling the outdoor furnace from a cold
start (water temperature below 100˚F or 38˚C) and/or no charcoal base left in the rebox).
It's been said that lighting a re can be more of an art than a science. You
may need to vary techniques to achieve best results. Many factors can have a
signicant eect such as size of wood, moisture content, wood storage, etc.
Over time, you will become familiar with your particular conditions. is will
allow you to identify cause and eect in a variety of circumstances and what
works best for your conditions.

15
CLASSIC EDGE OUTDOOR FURNACE • OWNER'S MANUAL
CAUTION
Do not burn plastic, garbage, treated wood or fuels not listed for this outdoor furnace.
CAUTION
If the water in the outdoor furnace boils, be sure to check the water level and restore
to full. Add Corrosion Inhibitor Plus™ (p/n 1650) as needed (see Water Quality and
Maintenance).
NOTE: Before ring the outdoor furnace for the rst time, make sure the proper amount
of Corrosion Inhibitor Plus™ has been added and the water level is 1" below the full mark
on the sight gauge, as the water will expand when heated.
1. Disconnect the heat load draw by turning o the pump(s).
2. Turn the controller on by pressing the Power button.
3. For Classic Edge 750 models, lift and push the bypass door handle toward
the back of the outdoor furnace to open the bypass door; then unlatch
and open the rebox door.
NOTE: For Classic Edge 750 models, if the optional Bypass Alarm Kit (p/n 2500153) is
installed, the alarm is a reminder that the bypass door is open. During a cold start, it will
continue to sound.
When opening the rebox door, the door switch will shut o the primary air supply solenoid
while the rebox door is open. Do NOT disable the door switch.
4. e rst time you re the outdoor furnace, add very dry kindling to ll
the rebox to a level approximately 15 inches (38 cm) from the bottom of
the rebox. Smaller kindling is preferred. It should be staggered and able
to ignite and burn quickly for the initial re.
5. To get the cleanest start-up, the kindling must rst start to burn at the
bottom and as close to center as possible. Place paper around the rebox
with very small pieces of kindling on top. Light the paper and kindling.
Once the paper and kindling are lit, close and latch the rebox door. For
Classic Edge 750 models, do not close the bypass door.
CAUTION
Do not leave the rebox door open while the re is burning. Damage to the door seal
and paint on the front of the outdoor furnace will result and it could cause a dangerous
build-up of gas in the rebox.

16 CLASSIC EDGE OUTDOOR FURNACE • OWNER'S MANUAL
Cold Start Initial Fire Up
Kindling Approximately
15" (38 cm)
Paper
© 2015 Central Boiler
6. Allow the wood load to burn until the kindling turns to coals (for Classic
Edge 750 models, leave the bypass door open); then add enough kindling
again to ll the rebox about 1/4 full. On top of the kindling, add 8-10
inches (20-25 cm) of dry, seasoned split wood. Close and latch the rebox
door.
7. For Classic Edge 750 models, wait for 15 seconds; then slowly pull the
bypass door handle toward the front of the furnace and push down to
close the bypass door.
8. After the water temperature is above 150˚F (66˚C), proceed to Adding
Heat Load.
Adding Heat Load
NOTE: During initial start-up, a considerable amount of moisture from condensation will
collect inside the rebox and heat exchanger and may drip out of the Reaction Chamber
door. This is normal and the moisture will evaporate after the rst couple of fuel loads.
1. With no heat load draw in the system, monitor the operation of the
outdoor furnace until the water temperature reaches the water temperature
setpoint.
2. Turn on the pump(s); then start a heat load draw in the system by turning
up the thermostat in the house. Monitor the outdoor furnace for one hour
or until another cycle occurs (i.e., outdoor furnace goes from combustion
to idle mode). If the water temperature drops and does not recover to the
water temperature setpoint within one hour of starting the heat load draw,
the heat load draw should be shut o, allowing the furnace to cycle to the
idle mode again.
NOTE: The outdoor furnace will not operate satisfactorily if the heat load is higher than
the output capacity of the outdoor furnace.
3. At this point, there should be glowing coals established in the bottom of
the rebox. e rebox can be lled with dry, seasoned split wood.
Load wood to reduce
condensation - this means
adding only enough wood
each time to maintain the
re for 12 hours.