Central Boiler e-Classic 1450 IR User manual

OUTDOOR WOOD GASIFICATION
FURNACE OWNER’S MANUAL
SAVE THESE
INSTRUCTIONS
(p/n 9000308 - REV. A) - 20-MAY-2015
Portland
Oregon USA
OMNI-Test Laboratories, Inc.
Tested &
Listed By
US
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.
117-O-30-2

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
The E-Classic 1450 outdoor hydronic heater by Central Boiler is listed by OMNI-Test Laboratories to the applicable
portions of the following standards: UL 2523-2009 Solid Fuel-Fired Hydronic Heating Appliances, Water Heaters and
Boilers, CAN/CSA-B366.1-M91 (R2007) Solid-Fuel-Fired Central Heating Appliance. Dual Fuel models tested to
applicable portions of ANSI Z21.20a-2008 Automatic Gas Ignition Systems and Components and certied to add to an
existing heating system.
The E-Classic includes two 4-foot stainless steel insulated chimney sections (6" in diameter, p/n 6500004). 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)
Manuel d'installation en français : p/n 9000202 Décalcomanies : p/n 7000041
Thermal Output Rating*: Manufacturer's Rated Heat Output Capacity: 200,000 Btu/hr
Annual Efciency Rating*: 84% (lower heating value), 77% (higher heating value)
*Performance is a product of the combustion rate, combustion efciency and heat exchange efciency with a single fuel load without refueling.
Results vary based on wood species, wood quality, wood quantity and moisture content. Efciencies are determined under the same test conditions
using higher heating value, lower heating value and annual fuel utilization efciency (AFUE).
• This 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 ranging from 0 to 214,271 Btu/hr.
• This wood heater has a manufacturer-set minimum low burn rate that must not be altered. This 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. The 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.
Videos to supplement the Owner's Manual are available at
www.youtube.com/centralboilerinc
Watch tips on initial startup, testing system water and more.
- Register at time of purchase for FREE 25 Year Limited Warranty -
Verify your warranty at CentralBoiler.com/w25

Table of Contents
INTRODUCTION .............................................................................................3
Labeling and Terminology ..................................................................................3
Foreword ...............................................................................................3
Tools ..................................................................................................3
Measurements...........................................................................................3
IMPORTANT PRECAUTIONARY INFORMATION ........................................................... 5
SECTION 1 – OUTDOOR FURNACE INSTALLATION........................................................ 6
PLANNING THE LOCATION ....................................................................................6
INSTALLATION PRECAUTIONS.................................................................................7
Chimney Recommendations ................................................................................7
GENERAL INSTALLATION INFORMATION ........................................................................8
Foundation..............................................................................................8
Potable Water ...........................................................................................8
Antifreeze ..............................................................................................8
Corrosion Inhibitor Plus™ ..................................................................................8
Shut-Off Valves ..........................................................................................9
Ground Rod Kit ..........................................................................................9
SUPPLY AND RETURN LINES ..................................................................................9
Temporary Above Ground or Winter Installations ...............................................................10
Digging the Trench ......................................................................................10
Underground Electric Wire ................................................................................10
Connecting to Existing Heating System ......................................................................10
INSTALLING LP TANK & GAS PIPING ...........................................................................11
HIGH ALTITUDE INSTALLATIONS ..............................................................................11
CIRCULATION PUMPS.......................................................................................11
Water Flow.............................................................................................11
Access to Ports on Outdoor Furnace ........................................................................11
Pump Selection .........................................................................................11
Installing Circulation Pumps ...............................................................................12
Shut-Off Valves .........................................................................................14
Filters.................................................................................................14
Thermostatic Valves .....................................................................................14
Thermostatic Valve Exemption .............................................................................14
Optional Gas-red Wood Ignition Burner......................................................................16
Purging Air from the System - Manual Air Bleeders .............................................................16
WATER HEATER INSTALLATION...............................................................................16
EXISTING FORCED AIR INSTALLATION.........................................................................17
Thermostatic Controls ....................................................................................20
HEATING MULTIPLE ZONES ..................................................................................21
HYDRONIC INSTALLATIONS ..................................................................................22
Pressurized Boiler System Installations ......................................................................23
Water-to-Water Heat Transfer System........................................................................23
Vented System Installation ................................................................................24
Direct Circulation Baseboard Installation......................................................................25
Radiant Floor System Installations ..........................................................................26
Pool and/or Hot Tub Heating ...............................................................................29
FILLING OUTDOOR FURNACE WITH WATER AND PURGING AIR....................................................30
SECTION 2 – OPERATING INSTRUCTIONS .............................................................. 32
Wood Selection and Preparation............................................................................32
FIRESTAR CONTROLLER ....................................................................................32
Operating the E-Classic for Maximum Efciency and Performance .................................................32
Importance of Properly Seasoned Wood......................................................................33
Air Flow and Maintaining the Coal Bed .......................................................................33
Ash Removal Frequency ..................................................................................34
COLD START FIRING ........................................................................................34
Cold Start Firing.........................................................................................34
Cold Start Firing with Power Ignition .........................................................................35
ADDING HEAT LOAD ........................................................................................36
LOAD WOOD TO REDUCE CONDENSATION.....................................................................37
SECTION 3 – MAINTENANCE ......................................................................... 40
CONTROL LOCATIONS ......................................................................................41
ROUTINE MAINTENANCE ....................................................................................41
WATER QUALITY AND MAINTENANCE .........................................................................49
Water Test Kits and Test Results ............................................................................49
Testing Supply Water.....................................................................................49
Corrosion Inhibitor Plus™ and Initial Treatment ................................................................50
Testing Treated Water in the Outdoor Furnace .................................................................50
System Maintenance .....................................................................................50
POST HEATING SEASON MAINTENANCE .......................................................................51
Flushing the System .....................................................................................51
SECTION 4 – SERVICEABLE ITEMS.................................................................... 52
FIREBOX DOOR SEAL.......................................................................................52
FIREBOX DOOR LATCH BEARING ADJUSTMENT ................................................................52
REACTION CHAMBER DOOR SEAL ............................................................................53
EXTERIOR LED LIGHTS .....................................................................................53
CIRCUIT BREAKER .........................................................................................53
BYPASS DOOR ROPE .......................................................................................54
SOLENOID ................................................................................................54
SECONDARY AIR CHARGE TUBE AND REFRACTORY MODULES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
THERMOCOUPLE ..........................................................................................55
SECTION 5 – TROUBLESHOOTING .................................................................... 56
SECTION 6 – GENERAL INFORMATION.........................................................................63
E-CLASSIC 1450 WIRING DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
E-CLASSIC 1450 WIRING DIAGRAM - OPTIONAL POWER IGNITION .................................................65
GLOSSARY ................................................................................................66
1-YEAR LIMITED WARRANTY ..........................................................................Back Cover

CENTRAL BOILER ONLINE RESOURCES
Enter the web address 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/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, ThermoPEX piping,
and example congurations for a variety of heating congurations.
Videos - http://www.CentralBoiler.com/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.
E-Classic Initial Startup Procedure
How to re your E-Classic from a cold start (meaning the
furnace water temperature is below 100˚F and/or there is no
charcoal base left in the rebox).
E-Classic Refueling Tips
Following a few easy tips when you're relling your E-Classic
with wood will help to ensure smooth, reliable operation day
after day.
2
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 offers 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 offers 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
This 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.

3
Labeling and Terminology
The outdoor furnace and this owner's manual 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.
DANGER: Indicates an imminently hazardous situation
which, if not avoided, will result in death or serious
injury.
WARNING: Indicates presence of a hazard which
can cause severe personal injury, death, or substantial
property damage if ignored.
CAUTION: Indicates 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.
Foreword
This manual is to be used as a guideline for installation,
operation, and maintenance of the E-Classic Outdoor
Wood Furnace.
This manual is organized into six sections for easy
reference.
• Section 1 – Outdoor Furnace Installation;
• Section 2 – Operating Instructions;
• Section 3 – Maintenance;
• Section 4 – Owner Serviceable Items;
• Section 5 – Troubleshooting;
• Section 6 – General Information.
Anyone owning or operating this outdoor furnace must
read, fully understand, and follow all of the information
in this manual.
NOTE: In higher populated areas, extend
the chimney to a height above the roofs of
surrounding buildings (see E-Classic Outdoor
Furnace Installation Scenario illustration in
Planning the Location section).
NOTE: The outdoor furnace may be connected
to an existing boiler system or hot water heating
system by a qualied installer only. However, the
outdoor furnace must not be pressurized.
Tools
Included with each new furnace are tools that are
invaluable for maintenance and cleaning. Use the hoe
to clean the rebox and Reaction Chamber. The Wonder
Bar® is used for scraping the rebox and the door frame.
The cleaning rod can be used to break up heavy or
solidied ash in the rebox. The heat exchanger scraper
is used to remove y ash and deposits from the heat
exchangers.
Measurements
E-Classic 1450 Measurements
A
42 3451507159475773
107 8613381180150119145185
B C D E F G IH
cm
in.
- Measurement (G) includes two 4 ft (1.2 m) chimney sections.
- Measurement (F) is from firebox door to chimney
inspection cover.
© 2011 Central Boiler
C
A
I
B
D
HG
E
F
INTRODUCTION
Wonder Bar
Hoe
Cleaning Rod
Heat Exchanger Scraper

4
IMPORTANT PRECAUTIONARY INFORMATION
The information contained on pages 4-5 appears throughout this manual. Be sure to read carefully and understand
these precautions before, during and after the installation, operation and maintenance of the furnace.
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.
WARNING
The outdoor furnace vent cap must t loosely on the
vent opening (Fig. 1). Do not force the cap down or
try to seal it tightly onto the vent pipe. Do not extend
or restrict the vent pipe or opening. DO NOT ALLOW
THE OUTDOOR FURNACE TO BE PRESSURIZED.
Fig. 1
WARNING
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).
WARNING
Do not install this outdoor furnace inside a building.
It is not intended or certied to be installed inside a
building.
WARNING
This outdoor wood furnace and/or chimney must
not be installed inside or under any conguration or
construction that contains combustible materials as
part of the structure or conguration. The chimney is
not intended or safety tested to be used or installed
other than on the furnace located outside of any
structure or enclosure.
WARNING
Disconnect the electrical power to the outdoor furnace
before replacing an electrical component.
WARNING
Should overheating occur or the gas supply fail to
shut off, do not turn off or disconnect the electrical
supply to the outdoor furnace. Instead, shut off the
gas supply at a location external to the appliance.
WARNING
Do not use this appliance if any part of the gas train
system has been under water. Immediately call a
qualied service technician to inspect the appliance
and to replace any part of the control system and any
gas control which has been under water.
WARNING
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.
WARNING
When cleaning the outdoor furnace, be careful not to
spill any coals.
WARNING
ALWAYS store ash in a covered non-combustible
container.
WARNING
When installing a heat exchanger on an existing hot
water boiler or in a forced air system, be sure none of
the existing system safety controls are disabled.
NOTE: Any changes to an existing boiler system
should be done by a qualied installer in
accordance with applicable codes.
WARNING
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.
NOTE: All installations and operations must be
in accordance with local and state codes which
may differ from the information in this manual.
WARNING
Do not allow combustible materials (straw, hay or
wood) near the outdoor furnace. Keep the perimeter
of the outdoor furnace clear and clean.

5
WARNING
Maintain the following clearances from combustibles
for the furnace installation:
• 44" (112 cm) from the back
• 12" (30.5 cm) from the sides
• 48" (122 cm) from the front
• 18" (46 cm) from chimney inspection cover
• The foundation must be noncombustible
• Refer to Fig. 3 for required maintenance
clearances
WARNING
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.
WARNING
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 off to the outdoor
furnace.
CAUTION
Open the bypass door 15 seconds before opening the
rebox door and close the bypass door 15 seconds
after closing the rebox door. Do not leave the bypass
door open during operation. Leaving the bypass
door open during operation may cause damage to
components of the outdoor furnace and may cause
creosote buildup that can prevent the bypass door
from sealing properly.
WARNING
All covers must be maintained at all times except
during maintenance, inspection and service.
WARNING
When opening the rebox door, the door switch will
shut off 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.
CAUTION
This outdoor furnace is not to be connected to a
chimney ue serving another appliance.
WARNING
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.
WARNING
This heater is designed to burn natural wood only.
Higher ef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, materials containing
rubber, waste petroleum products, 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 ineffective and cause smoke.
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 affected wood heater.
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: Do not use chemicals or uids to start
the re. Use kindling or gas-red wood ignition
option to start an initial re.
NOTE: This outdoor furnace is not to be used
with an automatic stoker.
WARNING
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 difcult to handle.
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.
WARNING
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.
IMPORTANT PRECAUTIONARY INFORMATION
The information contained on pages 4-5 appears throughout this manual. Be sure to read carefully and understand
these precautions before, during and after the installation, operation and maintenance of the furnace.

6Section 1 - Outdoor Furnace Installation
To ensure the E-Classic Outdoor Wood Gasication
Furnace functions as designed, careful planning and
proper installation are imperative. This section outlines
much of the information needed to install the outdoor
furnace, select water lines, install circulation pumps and
connect to your existing heat emitter(s).
Be sure to read carefully and observe all of the
information, not only in this section, but in the entire
owner's manual.
If any installation questions arise that cannot be
answered by the information in this manual, be sure to
contact your dealer.
PLANNING THE LOCATION
When selecting a suitable location, carefully consider
each of the following:
❑Must be installed in accordance to all applicable
codes and regulations.
❑Check with your insurance company to see if they
have any location requirements.
❑Consider prevailing winds and the direction smoke
will travel.
❑The shorter the distance between the outdoor
furnace and building(s) being heated, the lower the
cost will be for the installation of the hot supply
and return water lines and insulation.
❑Be sure to maintain the required clearances to
combustibles and recommended maintenance
clearances.
❑ThermoPEX pre-insulated piping is recommended
for all installations. Other types of piping should
not be buried in low-lying areas with standing
water or with a very high water table, or under an
area of heavy vehicle trafc unless protected from
excessive compression.
❑If the ground at the location is unstable or subject
to frost heaving, consider installing 2" (5 cm)
closed-cell insulation under the front portion of the
concrete slab the outdoor furnace will be installed
on, and under the area around the slab used for
walking (see Fig. 3).
NOTE: You may need to increase the chimney
height if conditions occur that force exhaust to
low levels.
SECTION 1 – OUTDOOR FURNACE INSTALLATION
INSTALLATIONS IN MASSACHUSETTS:
1. All installation components must be products
approved in the Commonwealth of Massachusetts
by the Gas and Plumbing Board.
2. The 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
defined in 310 CMR 7.01(1).

7
Section 1 - Outdoor Furnace Installation
INSTALLATION PRECAUTIONS
A qualied installer must perform the installation of
this supplementary outdoor furnace and must determine
how to install it to be compatible with the existing
heating source.
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.
Fig. 2 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 (see Fig. 2).
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 in Fig. 2.
NOTE: For chimney extensions or chimney
replacement, use only genuine Central Boiler
chimney components. Parts are available from
an authorized Central Boiler dealer.
The 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.
Fig. 2

8Section 1 - Outdoor Furnace Installation
GENERAL INSTALLATION INFORMATION
Foundation
The outdoor furnace may be installed directly on stable,
level ground without the necessity of a foundation.
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 Fig. 3 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.
Fig. 3
If the area for the concrete slab is unstable and/or
affected 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 (see Fig.
3).
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.
Foundations may consist of concrete, crushed
rock or patio blocks.
Potable Water
If the outdoor furnace is to heat potable water associated
with commercial food preparation or for heating milk-
house hot water, it is recommended to install a double-
wall heat exchanger. Also, when lling the system with
water, a backow preventer must be installed in the line
used for lling.
Antifreeze
Most outdoor furnaces are installed without antifreeze
when an existing heating system is in place and there
is no anticipation of leaving the outdoor furnace
unattended for extended periods of time. If the building
being heated has an alternate heat source, system water
may be kept from freezing by running the circulating
pump(s) and drawing heat from the existing heat
emitter(s).
To prevent freezing if the outdoor furnace is not red for
extended time periods or if lengthy power outages are
anticipated during cold weather, a nontoxic propylene
glycol boiler-type may be used in the system. Some
types of antifreeze that contain various inhibitors
have been known to create problems like coagulation
and jelling. To prevent potential problems, do not
use propylene glycol that is premixed with unknown
inhibitors. Central Boiler Corrosion Inhibitor Plus (p/n
1650) is compatible with straight propylene glycol. It is
important to use Corrosion Inhibitor Plus with straight
propylene glycol for corrosion protection. If adding
antifreeze to the system, it is imperative that the entire
system contain at least 30% antifreeze concentration
mixed with softened water to prevent bacterial growth
and minimize minerals in the system. Bacterial growth
is likely to occur with low antifreeze concentrations and
can cause corrosion in the furnace water jacket and/or
clogging of heat exchangers. To conrm the antifreeze
solution is adequate, allow the pumps to circulate for at
least 24 hours and then obtain a sample of the system
water. Using an antifreeze tester, the solution must be
protected to 0˚F (-18˚C) or below.
NOTE: Be sure to adhere to all warnings and
precautions on the antifreeze label.
NOTE: Do not use automotive or RV types of
antifreeze.
NOTE: If using antifreeze, use Test Kit (p/n 597)
when testing the treated water in the outdoor
furnace (see Water Quality and Maintenance).
Corrosion Inhibitor Plus™
To aid in protecting the system from corrosion, it is
imperative to add Central Boiler Corrosion Inhibitor
Plus™ (p/n 1650). When initially lling the system (see
Finalizing the Installation), add the Corrosion Inhibitor
Plus™ before adding water to the system. Any time
water is added to the system, Corrosion Inhibitor Plus™
must be added if a tested water sample indicates it is
necessary (see Water Quality and Maintenance).

9
Section 1 - Outdoor Furnace Installation
Corrosion Inhibitor Plus™ is composed of common
materials and is biodegradable. However, in keeping
with good safety and environmental practices, the
supplier recommends the following if draining treated
system water becomes necessary:
• You may drain the outdoor furnace to a home septic
system. Central Boiler Corrosion Inhibitor Plus™
is biodegradable and can be properly treated in a
residential septic system. If doing so, however, be
careful not to overow the septic system.
• Do not drain the outdoor furnace in such a manner
that the drain water could in any way contact
surface water, stream, river, estuary (where a river
meets a sea), lake, pond, ocean or other types of
waters.
• Do not drain to any location within 50 feet (15
meters) of any water well.
Shut-Off Valves
Shut-off valves must be installed on each hot supply
and return water line so each line can be shut off
individually for purging air from the system. Be sure all
valves and ttings are metal. Do not use plastic valves
or ttings.
Ground Rod Kit
The 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.
Fig. 4
SUPPLY AND RETURN LINES
Determine the conguration of the supply and return
lines from the outdoor furnace to where the supply and
return lines will connect to the existing heating system.
Central Boiler recommends using the ThermoPEX®
piping system.
ThermoPEX is a fully assembled, pre-insulated
piping system consisting of two 1" Central PEX lines
or two 1-1/4" PEX lines. The two lines (one a supply
and one a return line) are insulated with high-density
urethane insulation and a thick, durable, waterproof,
polyethylene outer jacket. One of the lines is marked
with a black stripe for identication.
NOTE: To prevent ground water from entering the
house, do not use drain tile, PVC pipe with bubble
wrap, or any other inferior material for insulating
the water lines.
NOTE: If the outdoor furnace supply and return
lines are not insulated properly, or if other
brands of insulated piping are used, there can be
excessive heat loss. This heat loss can greatly
increase the fuel consumption.
NOTE: If it is unavoidable that the trench will run
through an area of ponding water, use ThermoPEX
instead of other materials. ThermoPEX should
also be used for above-ground or winter
installations, and if the area is likely to be affected
by compaction.

10 Section 1 - Outdoor Furnace Installation
Temporary Above Ground or Winter
Installations
For temporary above ground or winter installations in
which the supply and return lines can not immediately be
buried underground, Central Boiler recommends using
ThermoPEX. Be sure that both the insulation and the
supply and return lines will not be exposed to ultraviolet
rays. The ThermoPEX black exterior jacket has UV
protection but the insulation and water lines inside do
not. Use a ThermoPEX termination cap at each end of
the installation to protect and seal the insulation from
water.
NOTE: Bury the ThermoPEX as soon as conditions
permit (e.g., once the ground has thawed).
NOTE: If ThermoPEX is installed temporarily
above ground, provisions should be made to
prevent possible risk of re coming into contact
with the ThermoPEX. ThermoPEX is constructed
of materials that can burn and transfer a re.
CAUTION
If ThermoPEX is installed temporarily above
ground, do not cover with combustible materials
(e.g., straw, hay, leaves, etc.).
Digging the Trench
WARNING
Before digging, be sure to call for utility locator
service.
The trench depth for ThermoPEX should be between
10" and 28" (25 and 71 cm).
Fig. 5
Underground Electric Wire
A 14-2 (two wires plus ground) underground rated wire
should supply the outdoor furnace with electricity. A
heavier gauge wire may be needed if the run is over 200
feet (61 meters). Check local codes and requirements.
It is recommended that the incoming fuse or circuit
breaker not exceed 15 amps.
Connecting to Existing Heating System
1. Make an entrance into the building(s) where the
supply and return lines are to enter.
2. Lay the ThermoPEX assembly in the trench and
feed one end into the building. Apply sealant around
the supply and return lines where they enter the
building.
3. Purge the supply and return lines before connecting
any ttings to ensure there is no debris or foreign
matter present.
NOTE: All holes made in basement or building
walls must be sealed completely to prevent water
from entering the building.
4. Close all valves on the outdoor furnace.
5. Install ttings to allow pressure-testing of both
supply and return lines. Pressurize with 50 psi (3.5
kg/cm2) of air; then check after 30 minutes to see if
pressure has dropped. A drop in pressure indicates a
leak; repair as necessary.
6. Connect the supply and return lines to the outdoor
furnace and the existing heat emitter(s). Fig. 6 shows
some of the PEX ttings and tools used in making
connections.
NOTE: The base on the back of the outdoor
furnace is removable if necessary for connecting
the supply and return lines to the outdoor furnace.
Fig. 6

11
Section 1 - Outdoor Furnace Installation
CAUTION
Allow for expansion and contraction of the supply
and return lines at each end. Without an allowance
for expansion and contraction, the lines may kink
or the ttings may be pulled apart, causing an
immediate water loss from the outdoor furnace.
Central PEX water lines can have an expansion
and contraction rate up to .095" per each 100 ft
and each 10°F (2.4 mm/30 m/5.5˚C).
7. Make sure there are no leaks in the supply and return
lines; then backll the trench.
NOTE: Do not backll the trench until the supply
and return lines have been tested to ensure there
are no leaks.
INSTALLING LP TANK & GAS PIPING
If installing an LP tank for the optional gas-red wood
ignition burner, it must be installed by a qualied
installer familiar with all regulations and must conform
to the authorities having jurisdiction, or in the absence
of such requirements, with the NFPA 54, the National
Fuel Gas Code ANSI Z223.1 or CAN/CGA B149.
All gas piping must conform to the authorities having
jurisdiction, or in the absence of such requirements,
with the National Fuel Gas Code ANSI Z223.1 or CAN/
CGA B149. The line to the outdoor furnace should be
buried underground and supported to the gas valve
appropriately. The piping should be installed and
tested for leaks by a qualied installer familiar with
all regulations. A sediment trap should be provided
upstream of the gas controls.
A two-regulator system using a rst-stage and a second-
stage regulator, or a combination two-stage regulator
(p/n 1930) such as the one shown in Fig. 7 should be
used. A small single-stage regulator may not ow
enough in cold weather.
Fig. 7
CAUTION
Make sure all covers for the gas ignition system
on the appliance are in place during operation
and service.
WARNING
Once the gas supply is connected, the appliance
and gas connection must be tested for leaks
before placing the appliance in operation.
HIGH ALTITUDE INSTALLATIONS
High altitude derating instructions are included with the
Gas-red Wood Ignition Burner Kit.
CIRCULATION PUMPS
NOTE: The direction of water ow is very
important for the proper operation of the outdoor
furnace. Installing a swing check valve in the
return line can prevent possible reverse ow.
Water Flow
For a single building water-to-air heat exchanger system
with a domestic water heater, the direction of water
ow must go from the hot outlet on the outdoor furnace
to the lower side tting of the domestic water heater
exchanger, to the lower tting of the heat exchanger
in the plenum of the existing furnace, and then to the
return port of the outdoor furnace.
NOTE: Some systems may have different ow
patterns.
Access to Ports on Outdoor Furnace
NOTE: Spare ports are sealed with pipe plugs
and covered with vinyl caps. To access a spare
port, remove the vinyl cap and trim the foam as
necessary.
The upper ports are the hot supply outlets and the lower
ports are the return inlets. This conguration allows for
mounting the circulation pumps on the outdoor furnace.
Refer to Fig. 8 and 9 for proper supply and return line
and pump installations.
Pump Selection
The Taco 009 is a medium ow, high head pressure
pump that requires an adequate amount of pressure on
the outlet side to prevent the motor from overloading.
The Taco 014 is a high ow, high head pressure pump
that requires an adequate amount of head pressure on
the inlet side to prevent cavitation. Therefore, a Taco
014 may need to be mounted lower near the base of the
furnace.
The Taco 007 is a medium to high ow, low head
pressure pump. In a very low-resistance system (e.g.,
short length of supply and return lines, only a at plate
heat exchanger, etc.), the 007 pump may need to be
mounted lower near the base of the furnace to prevent
cavitation at high water temperatures.
NOTE: See the Hydronic Component Selection
Guide (p/n 2482) for more detailed information.

12 Section 1 - Outdoor Furnace Installation
Fig. 8
Fig. 9
Installing Circulation Pumps
The following guidelines must be adhered to when
installing the circulation pump(s).
NOTE: See the Hydronic Component Selection
Guide (p/n 2482) for more detailed information.
WARNING
Maximum load of the outlet on the outdoor
furnace is 10A, 120VAC, and 60Hz.
A. The pump motor must be installed in a horizontal
position.
B. The junction box must not be located below the
pump motor (see Fig. 10). If necessary, remove the
four screws and rotate the pump body.
Fig. 10
C. Do not operate the circulation pump until the entire
system has been lled with water and checked for
leaks or the pump may be damaged.
D. Insulate the areas around the supply and return lines,
pumps and drain valve (Fig. 11); then install and
secure the back panel.
Fig. 11

13
Section 1 - Outdoor Furnace Installation
NOTE: At least one circulation pump must run
continuously to ensure proper operation of the
outdoor furnace.
E. The circulation pump(s) must be installed in the
supply line(s) with the arrow on each pump pointed
away from the outdoor furnace. In order to avoid
circulation problems, do not install the pump(s) in
the return line(s).
F. The pump(s) must be located near the base of
the outdoor furnace if the system has a high-ow
pump or very low resistance on the outlet side of
the pump. For example, if the outdoor furnace is 20
feet (6 meters) from the building and pumping water
through one-inch pipes, a 50-plate heat exchanger
or water-to-air exchanger, and back to the outdoor
furnace, the pump needs to be mounted with four
feet of water above the pump.
The pump(s) must also be located near the base of the
outdoor furnace if operating with water temperatures
of 195˚F. Water at 195˚F will boil on the inlet side of
the pump if there is not an adequate amount of water
above the pump. This causes cavitation, indicated
by a noisy, rattling pump and results in premature
failure of the pump.
Three or four feet of water above the pump should
be adequate for systems with higher resistance
(e.g., longer loops with other ttings, elbows, heat
exchangers). For systems with low resistance (e.g.,
short loops, larger diameter pipes and low resistance
heat exchangers like a water-to-air exchanger), it
may be necessary to mount the pumps with four
to eight feet of water above the pump. See the
Hydronic Component Selection Guide (p/n 2482)
for more information.
NOTE: See the Hydronic Component Selection
Guide (p/n 2482) for more detailed information.
Fig. 12
Installing the circulation pump(s) at the outdoor furnace
is recommended, but required if the building being
heated is higher than the outdoor furnace or if there is a
large rise in the water lines between the outdoor furnace
and building (see Fig. 13 and 14). Hot water boils at a
lower temperature when pulled uphill (because it is at
a lower pressure); therefore, hot water must be pushed
uphill to ensure proper circulation.
Fig. 13
Fig. 14
If not mounted on the outdoor furnace, the circulation
pump(s) must be mounted 4 to 5 feet (1.2 to 1.5 meters)
lower than the top water level in the outdoor furnace
(see Fig. 15).
Fig. 15
4 ft. (1.2 m) min.
Pump must be installed
in the hot supply line,
before the heat exchanger,
and may be located inside
this building or on the
outdoor furnace.
Water Level Building to be heated
Ground
Level
© 2015 Central Boiler

14 Section 1 - Outdoor Furnace Installation
Shut-Off Valves
Shut-off valves should be installed on both sides of each
pump so if it becomes necessary to repair or replace the
pump, the pump can be isolated (see Fig. 9).
Filters
A Y-strainer or lter may be installed at the outlet side
of the pump to remove foreign particles which may be
present in the water. Always install Y-strainers with the
cleanout in the lowest position.
Thermostatic Valves
NOTE: A 3/4" thermostatic valve with installation
instructions is included with each new E-Classic
1450 and must be installed on each set of supply
and return lines or warranty can be voided.
NOTE: For additional thermostatic valves, or
for 1-1/4" thermostatic valves, contact your
authorized Central Boiler dealer.
NOTE: The thermostatic valves illustrated
throughout the manual may vary from your
installation. See the installation instructions
provided with the thermostatic valve.
A thermostatic valve must be installed on each set
of supply and return lines in the system to maintain
the outdoor furnace water temperature above 150˚F
(65˚C). Operating the outdoor furnace with the water
temperature less than 150˚F (65˚C) may result in more
condensation in the rebox that can lead to corrosion.
It is recommended that the water temperature setpoint
of the furnace be set to 185˚F (85˚C) to decrease the
likelihood of the water temperature falling to 150˚F
(65˚C). As a result, the outdoor furnace will operate
with a greater efciency and require less maintenance.
Failure to follow proper operating instructions may
result in furnace damage.
Fig. 16
Ball Valve
Hose Bib
Hot Supply from Pump
on Outdoor Furnace
Return to
Outdoor Furnace
Thermostatic Valve
Thermostatic Valve Exemption
If the system includes more than one building and one of
the buildings is heated with an oil, gas or electric boiler
that also serves as a backup for the other building(s)
by keeping the system water temperature above 150˚F
(65˚C) when the outdoor wood furnace is not red, the
thermostatic valve is not required.

15
Section 1 - Outdoor Furnace Installation

16 Section 1 - Outdoor Furnace Installation
Optional Gas-red Wood Ignition Burner
An optional Gas-red Wood Ignition Burner Kit (p/n
2500000) may be installed to light and automatically
relight the wood. Installation instructions are provided
with the kit.
Purging Air from the System - Manual Air
Bleeders
Manual air bleeders may be installed in the high points
of the water lines where air may get trapped and cause
circulation problems. Water can be pumped to levels
higher than the outdoor furnace as long as the pump is
pushing the water to the higher level and there are no air
leaks in the system. Additionally, air should be purged
from the system using pressurized domestic water and a
hose with two female ends (see Fig. 17 and 35).
WARNING
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 the vent pipe. Do not
extend or restrict the vent pipe or opening. DO
NOT ALLOW THE OUTDOOR FURNACE TO BE
PRESSURIZED.
If any auto oat vents are present in the system, they
must be capped off tightly to prevent air from entering
the system.
Fig. 17
NOTE: See the Hydronic Component Selection
Guide (p/n 2482) for more detailed information.
WATER HEATER INSTALLATION
WARNING
DO NOT disable or remove any safety reliefs or
controls. Turn off the power to the water heater
before installation.
When installing a domestic hot water heat exchanger,
the hot supply line from the outdoor furnace should be
plumbed rst to the water heater heat exchanger and
then to the balance of the heating system.
A manual 3-way valve may be installed so that during
the non-heating season, the water heater may be operated
without operating the entire heating system (see Fig.
20). A tempering valve (or thermostatic mixing valve)
is to be installed in the hot water outlet from the water
heater. Install a tee in a tting on the top of the water
heater (see Fig. 18) for the hot water heat exchanger.
NOTE: If the water heater has been in service,
ush the water heater prior to installing the hot
water heat exchanger. Anode rod residue or other
sediments in the water heater may plug the heat
exchanger.
NOTE: Some gas water heaters are equipped with
a high water temperature probe that is connected
to the gas valve. When the water temperature
exceeds the high limit, the gas valve enters a
non-resettable lock out condition. This requires
replacement of the entire valve. The installer must
determine if this type of valve is present before
installation of a water-to-water heat exchanger.
CAUTION
Costly maintenance may be incurred if steps
are not taken during installation to reduce or
eliminate the possibility of the water temperature
in the water heater exceeding the high limit.
Fig. 18
H
C
M
R
NOTE
Use softened water if
water has a high mineral
content to avoid plugging
the heat exchanger.
NOTE
Installer must comply
with all applicable codes
and regulations.
NOTE
Outdoor furnace water
temperature setpoint
should be set at 185˚F
(85˚C) minimum.
NOTE
A pump must be installed
in the hot supply line
between the outdoor
furnace and thermostatic
valve.
NOTE
If outdoor furnace is not
being used for an
extended period of time
to heat water, this valve
should be closed to
prevent heat loss from
the water heater through
the side arm exchanger.
Hot Supply from Pump
on Outdoor Furnace
Return to Outdoor Furnace
Thermostatic Valve
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.
Hot Supply
For illustration purposes
only, water heater styles
may vary.
© 2015 Central Boiler
Existing
Water
Heater
1"
Central
PEX®
Optional Bypass
Valve

17
Section 1 - Outdoor Furnace Installation
EXISTING FORCED AIR INSTALLATION
When the E-Classic Outdoor Wood Gasication Furnace
is installed in conjunction with 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.
Following are several important items for this type of
installation.
• Plenums installed to the furnace must be
constructed of metal in accordance with NFPA
90B, 2-1.3.
• If an air conditioning coil is located in the plenum,
the heat exchanger should be mounted between
the fan and the air conditioning coil so the heat
exchanger will not freeze when the air conditioner
is being used.
• The heat exchanger should not be installed in the
cold-air return of the existing forced air furnace
because components of the existing furnace could
overheat.
• The heat exchanger may be mounted either
horizontally or vertically with the outlets on the
side (see Fig. 19).
Fig. 19
• In all applications, the heat exchanger must be
mounted level from front to back, with the outlets
on the side. If the outlets are positioned upward or
if the exchanger is not level, an air lock can restrict
the water circulation and reduce the amount of
heat transfer.
• The lower tting is the inlet/hot supply from the
outdoor furnace and the top tting is the outlet/
return back to the outdoor furnace.
• It is best to install a heat exchanger that ts the
plenum.
• If the plenum is larger than the heat exchanger, it
should be mounted in the center without gaps on
the sides that would allow air to ow around the
heat exchanger. All air must be directed through
the face of the exchanger. Air ow deectors need
to be installed in the plenum on the outlet side of
the heat exchanger if air ow is funneled into the
heat exchanger.
• Be sure to consider the airow through the
ductwork so air circulation is not blocked off to
parts of the building.
• Adding a heat exchanger coil in the hot air
plenum or ductwork of the existing furnace may
decrease the air ow in the system. The existing
heat emitter(s) (gas or electric) should be operated
before adding the heat exchanger.
• The air temperature rise should be measured with
the heat emitter(s) running for an adequate amount
of time to get a stabilized temperature reading.
The heat exchanger can then be installed in the
system. The existing heat emitter(s) should be
operated again and the air ow should be adjusted
to maintain the same temperature reading. The air
ow may have to be increased to accomplish this.
• On a belt-drive system, the blower pulley and/
or motor pulley may be changed; however, the
electrical current owing through the motor must
not be changed to exceed the nameplate rating.
A larger blower motor may be used. On a direct-
drive system, in most cases the blower motor will
not need to be replaced; however, the speed of the
blower motor may have to be increased.
CAUTION
When installing the heat exchanger, be sure
none of the existing system safety controls are
disabled.
NOTE: Any electrical installation should be done
by a certied electrician in accordance with all
applicable codes.
• Due to the internal circuitry of some thermostats,
a snap disc temperature control may have to be
installed on the heat exchanger manifold to provide
an interlock for the air conditioner. This prevents
the air conditioner from operating when the water
temperature is higher than 140°F (60˚C).

18 Section 1 - Outdoor Furnace Installation
H
C
M
R
Hot Supply
Water-to-Water
Heat Exchanger
Bypass Line
Hot Supply from Pump
on Outdoor Furnace
Return to Outdoor Furnace
Thermostatic Valve
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
On multi-speed fans, cap and
tape off any extra wires.
NOTE
Installer must comply with all
applicable codes and regulations.
NOTE
This configuration allows
use of a 24-volt thermostat
on older forced-air units
with no control board.
NOTE: A certified electrician must
perform the electrical installation.
WATER-TO-AIR HEAT EXCHANGER
AND WATER HEATER SYSTEM
C
R
Y
G
FAN
TIME PRGM RUN HOLD
SYSTEM
COOLON AUTO OFF HEAT
110-V Line
Voltage
White
G
Transformer
© 2015 Central Boiler
Thermostat
p/n 588
White
White
Ground, Hot and
Neutral Wires
at Furnace
White
Neutral
For illustration purposes only.
R
Black
Black
Neutral
Red
Ground
Fan Relay
Fan
Switch or
Snap Disc
on Furnace
Black
Brown
Fan Speed Tap Wires
(Connect Prefered Speed Tap Wire)
C
G
R
W2
E/W1
Y1
(O/B)Y2
L
24-Volt Thermostat
C is optional
with batteries
Fig. 20