A-Maize-Ing Heat LDJ620-9 User manual

Furnace Installation and Owners Manual
Model LDJ620-9 Furnace
Model LDJ620-10 Furnace
Model 14 Bin
LDJ620_E01_R03_2006.03

This manual explains the proper installation,
operation, and maintenance of yourA-MAIZE-ING
HEAT®furnace. Study and understand these
instructions thoroughly before installing,
operating, or maintaining the furnace. Failure to
do so could result in serious injury or death and/or
equipment damage. Consult your A-MAIZE-ING
HEAT®dealer or LDJ Manufacturing, Inc. if you do
not understand the instructions in this manual or
need additional information.
LDJ Manufacturing, Inc. recommends that you
retain this manual for future reference of
operation, maintenance, and parts information.
The instructions, illustrations, and specifications in
this manual are based on the latest information
available at the time of publication. Your furnace
may have product improvements and options not
yet contained in this manual.
LDJ Manufacturing, Inc. reserves the right to
make changes at any time without notice or
obligation.
Additional copies of these instructions are
available from LDJ Manufacturing, Inc.
No part of this manual may be reproduced in any form or by any means, electronic or
mechanical, including photocopying, recording, or by any information storage and
retrieval systems, without the express written consent of LDJ Manufacturing, Inc.
Copyright © 2006
All rights reserved.
LDJ Manufacturing, Inc.
1833 Highway 163
Pella, Iowa 50219, USA
A-MAIZE-ING HEAT®, and A-MAIZE-ING HEAT® Logo are
registered trademarks of LDJ Manufacturing, Inc.
in the U.S. and/or other countries.
Furnace testedandcertifiedby
Underwriters Laboratories

Furnace Installation and Owners Manual 1
2005.08.29 PTC Models LDJ620-9 and LDJ620-10
TABLE OF CONTENTS
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Disclaimer of Liability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Welcome to the A-MAIZING-HEAT® Furnace . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Safety Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Contact Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Installation and Location Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Installation Configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Furnace Clearances and Accessibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Combustion Air Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Venting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Important Installation Points . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Masonry Chimney . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Listed Chimney . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Barometric Draft Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Required Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Unpacking and Setup - Furnace . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Unpacking and Setup - Storage Bin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Ducting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Chimney Vent . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Barometric Draft Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Draft Guage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Electrical Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
Electrical Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
Thermostat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
Burner Lighting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
Draft Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
Furnace Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
Typical Operation Cycle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
Clinker Buildup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Power Failure Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Summary of Settings and Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
HIGH FIRE Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
LOW FIRE Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Variable BTU Timer (LDJ620-10 only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
Daily Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
Weekly Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
Monthly Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
Annual Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19

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2005.08.29 PTC
Models LDJ620-9 and LDJ620-10
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
Tips for Good Combustion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
Initial Setup Quick Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
Operation Quick Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
Poor Combustion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
Inefficient Operation and/or Operating Too Hot . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
Mechanical / Electrical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
Wiring Diagram: LDJ620-9 100,000 BTU Furnace . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
Wiring Diagram: LDJ620-10 165,000 BTU Variable Rate Furnace . . . . . . . . . . . . . . . . . .25
Repair Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
Burn Pot Auger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
Hopper Bin Auger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
Storage Bin - Model 14 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
Heat Exchanger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
Furnace Cabinet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30
Furnace Blower . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32
Addendum . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34
Venting Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34
Barometric Draft Control Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36
Ducting Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38

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LDJ620_E01_R03_2006.03 Models LDJ620-9 and LDJ620-10
WARRANTY
LDJ Manufacturing, Inc. warrants the A-MAIZE-ING HEAT®furnace against any defects in workmanship
and materials for a period of one (1) year after the date of purchase. LDJ Manufacturing, Inc. will repair
or replace as necessary any defective parts within the warranty period.
LDJ Manufacturing, Inc. warrants the heat exchanger and burner only, for a period of five (5) years after
the date of purchase. LDJ Manufacturing, Inc. will replace any defective heat exchanger or burner parts
free of charge within the five (5) year period. All heat exchanger and burner claims will be limited to parts
only, labor is not provided.
This warranty does not take effect until the warranty registration card is sent in. If the card is not filled out
and returned to LDJ Manufacturing, Inc. within 30 days of date of purchase, warranty claims on your unit
may be denied. All warranty claims must be reported to the nearest A-MAIZE-ING HEAT®dealer.
DISCLAIMER OF LIABILITY
The foregoing warranty constitutes the only warranty made by LDJ Manufacturing, Inc. regarding the
A-MAIZE-ING HEAT®furnace. LDJ Manufacturing, Inc. makes no warranty as to the merchantability or
as to the fitness of this product for any particular purpose. LDJ Manufacturing, Inc. disclaims any and all
liability for damages, consequential or otherwise, cost or expense of any sort or nature arising out of the
use of the A-MAIZE-ING HEAT® furnace or any alleged defect in design, manufacture, assembly,
instructions, or labeling thereof.
WELCOME TO THE A-MAIZING-HEAT®FURNACE
Congratulations on your purchase of the A-MAIZE-ING HEAT®biomass fueled furnace. We are honored
that you selected the A-MAIZE-ING HEAT®furnace. The A-MAIZE-ING HEAT®furnace is the first
biomass fired furnace to be listed by Underwriters Laboratories. The UL listing is your assurance of a
safe and quality product.
As convenience fuels become more expensive and less abundant, corn and pellets as fuel are becoming
very attractive and viable as alternative heat sources. With high energy costs it makes sense to use a
heat source that utilizes a resource that is readily available and cost effective.
LDJ Manufacturing, Inc. believes that there is no substitute for safety and quality. You can have
confidence that your A-MAIZE-ING HEAT®furnace will serve your heating needs now, and for years to
come. We emphasize that you follow our policy of SAFETY FIRST when installing and using your
A-MAIZE-ING HEAT®furnace. The installation and owners manual must be read before installing and
operating your A-MAIZE-ING HEAT®furnace.
Your A-MAIZE-ING HEAT®furnace is a practical alternative heat source specifically designed for
residential use. Proper care of this appliance should result in many years of service and comfort. An
annual checkup by a certified HVAC service person is recommended.
If you have any problems, questions, or concerns, please contact your nearest A-MAIZE-ING HEAT®
dealer, or contact LDJ Manufacturing, Inc. at 866-535-7667 for information on the dealer nearest you.

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LDJ620_E01_R03_2006.03
Models LDJ620-9 and LDJ620-10
SAFETY INSTRUCTIONS
Failure to follow these safety instructions may result in serious injury
or death and/or property damage.
• Do not install or use this product unless the instructions within this manual have been carefully read
and understood.
• This heating appliance must be installed in accordance with local codes.
• Installation is to be performed by a qualified installer, according to state and local codes.
• Maintain adequate minimum clearances to combustible materials (refer to “Furnace Clearances and
Accessibility” on page 5).
• Install in an area with adequate air for combustion and ventilation: a minimum of 60 cubic feet per
minute.
• Do not connect this heating appliance to a chimney flue serving any other heating device.
• Disconnect all power to the unit before performing routine maintenance or service. Before servicing,
allow the unit to cool.
• Establish a regular service and maintenance schedule for efficiency and safe operation (refer to page
page 18). Have a qualified service person perform tasks you are not familiar with.
Children and adults should be alerted to potential high service
temperatures of the burner door. KEEP CHILDREN AWAY!
Risk of fire or explosion. Do not burn gasoline, oil, garbage or other
flammable substances.
Do not burn treated corn. Treatment chemicals can be unknown and
their inhalation can result in serious health problems or death.
• Do not place clothing or other flammable materials on or near this appliance.
• Ashes should be placed in a metal container with a tight fitting lid. The closed container of ashes
should be placed on a non-combustible floor or on the ground, well away from all combustible
materials pending final disposal. If the ashes are disposed of by burying in soil or otherwise
dispensed, they should be retained in the closed container until all clinkers have thoroughly cooled.
CONTACT INFORMATION
If you have any questions about this product or its installation, please contact us:
Address LDJ Manufacturing, Inc.
1833 Hwy 163
Pella, Iowa 50219
Phone 641 • 620 • 9412
866 • 535 • 7667
Fax 641 • 620 • 8302
Website www.cornheat.com
Email inf[email protected]

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LDJ620_E01_R03_2006.03 Models LDJ620-9 and LDJ620-10
INSTALLATION AND LOCATION CONSIDERATIONS
Failure to install the A-MAIZE-ING HEAT®furnace according to the
guidelines and instructions contained within this manual may result in
serious injury or death, property damage, or voiding of the warranty.
Installation Configurations
IMPORTANT: The A-MAIZE-ING HEAT®
furnace is designed for use as a primary heat
source furnace. It should be installed with its
metal hot air plenum connected to the hot air
duct work, and its metal cold air joined to the
return air system.
This unit is not intended to be an add-on unit
to another furnace. If you intend to use the A-
MAIZE-ING HEAT®furnace in conjunction with
another furnace, air back-feed prevention
measures must be taken to prevent the
overheating of either furnace.
Furnace Clearances and Accessibility
The following are the minimum distances the
furnace may be to a combustable surface:
top.........................................................................32"
either side ...............................................................6"
front.......................................................................30"
rear-most surface on back (furnace or flue)..........18"
For ease of service, the following minimum
distances are recommended:
top.........................................................................32"
side opposite bin...................................................24"
front.......................................................................36"
rear-most surface on back (furnace or flue)..........18"
12"7"
18" (**)
41"
36" (*) 24" (*) 22" 35"
51"
*Minimum service distance
**Minimum combustable clearance

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LDJ620_E01_R03_2006.03
Models LDJ620-9 and LDJ620-10
The overall dimensions of the A-MAIZE-ING
HEAT®furnace are as follows:
furnace cabinet width............................................22"
furnace cabinet depth (with door) .........................41"
furnace cabinet height...........................................51"
widest point of furnace (cabinet + burner fan) ......29"
storage bin width...................................................35"
storage bin depth..................................................51"
storage bin height .................................................47"
overall width when assembled
(as configured above) ...........................................76"
Combustion Air Requirements
Failure to provide adequate combustion air can lead to increased
carbon monoxide production and increased emissions of combustion
gases into the building, which may cause death or serious injury.
The furnace must have a minumum supply of
60 cubic feet of air per minute. Consult a
qualified furnace installer to analyze if the air
supply is adequate. In newer air-tight homes,
the combustion air may need to be brought in
from the outside.
Venting
Failure to provide correct chimney venting can lead to increased
carbon monoxide production and increased emissions of combustion
gases into the building, which may cause death or serious injury.
Do not connect this heating appliance to a
chimney flue serving any other heating
device.
Venting may be provided using a lined masonry
chimney or a listed chimney (class ‘A’). The
chimney has two functions:
1. To exhaust smoke and flue gases that are the
result of combustion.
2. To provide “draft” to the furnace. This provides a
continous supply of fresh air into the appliance so
that proper combustion is possible.
Important Installation Points
• The connection from the heating appliance to
the chimney must be made using 6" black
pipe.
• Avoid using more than two elbows in
connecting the furnace to the chimney.
• Any horizontal runs of connector pipe should
have a minimum rise of 1/4" per foot of run to
allow condensation to flow back to the
firebox.
• A minimum distance of 18" must be
maintained between the connection pipe and
combustible wall surfaces.
• A minimum distance of 32" must be
maintained between the connection pipe and
combustable ceiling surfaces.
Masonry Chimney
An existing lined masonry chimney must be
cleaned and inspected. All connections made to
the chimney must comply with NFPA Standard
211 and all applicable building codes. Consult a
qualified furnace installer and/or local building
inspector to make sure the chimney and
connections comply and are safe.
Listed Chimney
A listed chimney must be rated for a solid-fuel
burning appliance and must comply with NFPA

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LDJ620_E01_R03_2006.03 Models LDJ620-9 and LDJ620-10
Standard 211 and all applicable building codes.
Consult a qualified furnace installer and/or local
building inspector to make sure the chimney and
connections comply.
For more information on venting with listed
chimneys, refer to “Venting Information” on
page 34.
Barometric Draft Controls
IMPORTANT: In order for the furnace to operate
correctly, 0.04" to 0.06" water column of draft
during low-fire operation must be established
and maintained. Low-fire operation is when the
thermostat is satisfied and no fuel is being
augered into the burner. If the chimney draft is
too high, the fire will go out. If the draft is too low,
smoke may back up into the furnace and
storage bin, creating a possible hazard.
The procedure for establishing the proper
chimney draft will be discussed in the
“Installation” section starting on page 7.
For more information on the barometric draft
regulator, refer to “Barometric Draft Control
Information” on page 36.
INSTALLATION
Required Tools
• Flat bit screwdrivers
• Phillips screwdriver
• 5/16" hex driver
• 3/8" hex driver
• 7/16" wrench
• 7/16" socket
• Drill and 1/4" bit
Unpacking and Setup - Furnace
IMPORTANT: Beforeunpackingandassembling
the A-MAIZE-ING HEAT®furnace, review the
“Installation and Location Considerations”
section starting on page 5 for the proper
placement of the furnace and storage bin.
Step 1: Remove all shipping materials.
Step 2: Remove three screws holding furnace to
pallet and remove furnace from pallet.
• Access one screw by removing filter door.
• Remove the other two screws from beneath
the pallet.
Step 3: Remove auger motor assembly and
hardware package from ash pan drawer.
Step 4: Insert burner auger assembly (1) into
burner auger tube (2).
1
2

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Step 5: Secure auger assembly into position
with self-tapping bolt (3).
Step 6: Remove cover from auger motor
housing (4).
Step 7: Attach flex conduit (5) from electrical
box on side of furnace to furnace auger motor
housing with conduit lock nut (6).
Step 8: Install wooden handles onto door
handle (8) and heat exchanger cleaner (9) by
twisting them on. Do not drive them on,
splitting may result.
Unpacking and Setup - Storage Bin
Step 1: Remove base parts and storage bin
from shipping container.
Step 2: Assemble base rails (1) and legs (2)
together with sixteen 1/4"-20 x 1/2" bolts (3)
and nuts.
Step 3:
Position storage bin (4) on top of base (5) .
Make sure it is level and fitted against base at all
corners.
3
6
4
58
9
1
2
3
4
5

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Step 4: Slide auger boot (6) with clamp (7) over
bin outlet. Tighten clamp securely.
Step 5: Install two sheet metals screws through
clamp, auger boot, and into the bin outlet for a
permanent connection.
Step 6: Install coupler (8) between bin auger
tube and furnace fuel inlet. Secure with two
hose clamps (9).
Step 7: Attach flexible conduit (10) from bin
auger to furnace auger motor housing (11)
with a conduit locknut.
Step 8: Connect one black bin auger motor wire
to the two orange wires in the auger motor
housing with a wire nut connector.
Step 9: Connect the other black bin auger motor
wire to the two white wires in the auger motor
housing with a wire nut connector.
Step 10: Install cover on auger motor housing.
Ducting
IMPORTANT: The hot and cold air furnace
connections to the A-MAIZE-ING HEAT®
furnace must not be less than 196 square
inches. Any reduction in size of the connections
will restrict air movement through the heat
exchanger, resulting in overheating and
operational problems with the furnace.
NOTE: For more information on ducting
guidelines and installation, refer to “Ducting
Information” on page 38.
6
7
8
9
9
10
11

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Chimney Vent
Failure to provide correct chimney venting can lead to increased
carbon monoxide production and increased emissions of combustion
gases into the building, which may cause death or serious injury.
Do not connect this heating appliance to a
chimney flue serving any other heating
device.
Step 1: Make sure an approved lined masonry
or listed chimney is installed for the A-MAIZE-
ING HEAT®furnace. All chimneys and
connections made to the chimney must comply
with NFPA Standard 211 and all applicable
building codes. Consult a qualified furnace
installer and/or local building inspector to make
sure the chimney and connections comply.
Refer to “Venting” on page 6 and “Venting
Information” on page 34 for additional
information.
Step 2: Make sure the furnace and storage bin
are correctly placed. Refer to “Furnace
Clearances and Accessibility” on page 5 for
proper clearance dimensions.
Step 3: Connect furnace to chimney with 6"
metal flue pipe using sheet metal screws to
secure (refer to “Venting” on page 6).
Barometric Draft Control
Install the baromatric draft control according to
the directions beginning on page 36. It will be
adjusted (refer to “Draft Adjustment” on
page 15) after the installation of the furnace is
complete and a fire has been built
Draft Guage
The draft guage is installed to monitor the
chimney draft measured in inches of water
column. The A-MAIZE-ING HEAT®furnace
requires 0.04 to 0.06 water column inches of
draft.
Install the draft guage as follows:
NOTE: There are parts in the kit that will not be
used in this installation.
Step 1: Remove gauge and installation
accessories from box.
Step 2: Select an installation location close to
the flue pipe where the gauge can remain
level.
Step 3: Hold gauge in position and install one
1-3/4" screw through top hole (1); do not fully
tighten.
Step 4: Level unit with bubble level (2) located in
face of unit and install a second 1-3/4" screw
through bottom hole (3); do not fully tighten.
Step 5: Check level of unit and tighten screws.
Step 6: Drill a 1/4" hole into the flue connection
pipe at a location between the furnace flue
connection and the barometic draft control.
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LDJ620_E01_R03_2006.03 Models LDJ620-9 and LDJ620-10
Step 7: Straighten the aluminum tube (4)
included with the draft gauge kit.
Step 8: Uncoil the white rubber tubing and slip
the black rubber connection (5) over one end
of the aluminum tube. The other tube will just
hang and be left unconnected.
Step 9: At the opposite end of the double tubing,
split the two individual hoses apart for about 1-
1/2".
Step 10: At the top of the unit, connect the
hoses to it.
• Connect the all white hose to the port
marked HIGH (6).
• Connect the white hose with the red line to
the port marked LOW (7).
Step 11: Turn the ZERO SET (8) knob counter-
clockwise 2 to 3 turns.
Step 12: Loosen and remove the FILL (9) plug.
Step 13: Open the bottle of red gage oil (10)
and install nozzle top.
Step 14: Carefully pour oil into the FILL opening
until the red gage oil reaches ZERO (11).
Step 15: Re-install FILL plug.
Step 16: If the red gage oil is not exactly on
ZERO, adjust it by turning the ZERO SET knob
clockwise or counter-clockwise.
Step 17: Slide the aluminum tube about 2" to 3"
into the hole drilled into the flue.
Step 18: The draft gauge is now ready to be
used.
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9
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LDJ620_E01_R03_2006.03
Models LDJ620-9 and LDJ620-10
Electrical Connections
Turn off electric power at the breaker box or service panel before
making any electical connections. The ground connection must be
completed before making line voltage connections. Failure to do so
can result in electrical shock, severe personal injury, or death.
The furnace cabinet must be permanently grounded. A ground screw
is provided in the junction box for this purpose. Failure to properly
ground the furnace cabinet can result in fire, electrical shock,
personal injury, or death.
Electrical Supply
IMPORTANT: All electrical work must conform
to local codes and ordinances or with the
National Electrical Code. If unfamiliar with wiring
and codes, have a licensed electrician perform
the electrical connection.
The electrical supply to the furnace should be
from a 120V, 15 amp protected circuit. Make all
connections inside box (1):
• Black wire to black wire
• White wire to white wire
• Ground wire (green) to ground terminal.
Thermostat
A thermostat is not included with the A-MAIZE-
ING HEAT®furnace. Read and follow all
directions included with the thermostat. The
location of the thermostat has an important
effect on the overall performance of the furnace.
The thermostat relay (2) is located above the
electrical supply connection box. Connect the
thermostat wires to terminals “R” and “W” on the
relay.
The relay terminal markings are as follows:
•“R” - 24V power supply to thermostat
•“W” - Heat signal from thermostat
•“G” - Fan full time signal from thermostat
•“Y” - A/C signal from thermostat
•“C” - 24V common
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LDJ620_E01_R03_2006.03 Models LDJ620-9 and LDJ620-10
OPERATION
Burner Lighting
IMPORTANT: Corn or pellets containing stalks,
fines, dirt, etc. may cause the augers to plug,
resulting in excessive wear and possible auger
motor failure. Also, burning treated corn is not
recommended because of increased clinker
buildup and the extinguishing properties of the
treatment used on the corn.
NOTE: If the furnace has ash and clinkers left
over from a previous burn in the burner pot, they
must be completely removed before lighting a
new fire.
NOTE: Use of powdered graphite.
• During the initial lighting of the furnace, skip
step 1 and only add 2 to 3 cups of corn or
pellets to the storage bin.
• Then add 1 tablespoon of powdered graphite.
• Continue with steps 2 through 7 below.
• As this mixture feeds into the storage bin
auger, repeat this procedure one more time.
• The powdered graphite will lubricate the
storage bin auger until it begins to polish from
the flow of corn/pellets.
• This operation should be repeated at the
beginning of each heating season.
• This operation should also be repeated if the
hopper is allowed to run empty and a sticky
smoke film coats the storage bin auger tube.
• Powdered graphite may also be added about
once a month at a time when the storage bin
is low on fuel to help the auger stay
lubricated and polished.
NOTE: When lighting the LDJ620-10 furnace
(variable BTU output), always light it with the
furnace set for 100,000 BTU output. After the
furnace has run for thirty minutes, make the
desired adjustments to the output. Refer to
“Variable BTU Timer (LDJ620-10 only)” on
page 17 for more information.
Step 1: Fill the storage bin (1) with dry (15% or
less moisture) and clean (USDA #2 or better)
corn or pellets.
Step 2: Turn on electrical power to the furnace.
Step 3: Turn the thermostat to its highest
setting.
Step 4: Fill the burner pot with corn/pellets (2) to
the lower set of air holes on the inside of the
burner.
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LDJ620_E01_R03_2006.03
Models LDJ620-9 and LDJ620-10
Step 5: Finish filling the burner pot with kindling
wood and paper, or pelletized wood (3). Gelled
fire starter may be used as a substitute for the
paper.
Step 6: Light fire and move the START/OFF/ON
switch (4) to START. This will start the burner
blower only (the auger motors will not turn until
the furnace has reached operating
temperature). Keep the switch in the START
position for 5 to 10 minutes, or until you see a
good even fire.
Step 7: With the fire (5) well started, move the
START/OFF/ON switch to ON.
Step 8: Set wall thermostat to desired
temperature.
Step 9: If the corn/pellets do not completely
ignite, it may be necessary to add more
kindling a couple of times to get it completely
burning.
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LDJ620_E01_R03_2006.03 Models LDJ620-9 and LDJ620-10
Draft Adjustment
After the furnace has been lit and has cycled a
few times, the chimney draft will need to be
adjusted.
The barometric draft control, installed in the
metal flue pipe connecting the furnace to the
chimney, must be adjusted so the A-MAIZE-ING
HEAT®furnace has 0.04 to 0.06 water column
inches of draft. Refer to “Barometric Draft
Control Information” on page 36 for adjustment
instructions.
The draft gauge installed earlier (refer to “Draft
Guage” on page 10) will be used to set the
barometric draft control.
IMPORTANT: The chimney draft should never
exceed 0.06 water column inches. On extremely
tall chimneys or chimneys larger than 6" in
diameter, it may be necessary to install a
secone barometric draft control, or to reduce the
outlet opening of the chimney to approximately
28 square inches, or both to maintain the
chimney draft at 0.04 to 0.06 water column
inches.
Furnace Operation
Typical Operation Cycle
NOTE: After the furnace has been properly lit
and the operating temperature has been
reached (refer to “Burner Lighting” on page 13),
only the thermostat needs to be set to maintain
the desired temperature. The thermostat,
furnace temperature sensors, andtimers control
the augers and blowers.
A typical furnace operation cycle is as follows:
Step 1: Thermostat activates fuel feed system.
The combustion fan starts and the augers feed
fuel into the burner (HIGH FIRE).
Step 2: Heat builds up in the furnace which
activates the blower fan switch. The blower fan
starts and warm air is distributed through the
ductwork.
NOTE: The furnace blower has three (3)
speeds.
• Low (red wire #3)
• Medium (blue wire #2)
• High (black wire #1)
All units are shipped from the factory set to the
medium speed. The blower speed can be
changed by accessing the 10"x10" control box
on the left side of the furnace. Change blower
speeds by removing the blue wire from the
current speed terminal and reconnect it to the
desired speed terminal.
Step 3: When the thermostat setting is satisfied,
it will shut off the fuel feed system.
Step 4: To maintain the fire, a furnace timer will
activate the fuel feed system for a short period
of time followed by a longer period of no fan or
auger activity (LOW FIRE).
NOTE: The LOW FIRE timer is factory set to
cycle at 2 minutes ON and 6 minutes OFF. This
is a suggested setting, but can be adjusted
depending upon user experience.
Step 5: The furnace blower will continue to run
until the warm air is removed from the furnace.

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LDJ620_E01_R03_2006.03
Models LDJ620-9 and LDJ620-10
Clinker Buildup
The A-MAIZE-ING HEAT®furnace feeds the
corn/pellets into the bottom of the burner,
thereby creating conditions for efficient fuel
consumption. The residual ash (clinkers) are
then spilled over the top of the burner ring,
falling into the ash pan below. This process
cleans the burner chamber.
IMPORTANT: If the furnace is installed in an
application that causes the furnace to run
almost continously, or if incorrect types of corn/
pellets are burned, large clinkers can form.
These clinkers can stick to burner pot and
eventually extinquish the fire. They must be
loosened and removed with the clinker tool.
NOTE: If your furnace has been installed in an
application where it runs almost continuously,
and you are experiencing problems, contact LDJ
Manufacturing, Inc. for assistance.
Power Failure Instructions
NOTE: If a power failure does not last longer
than 20 to 30 minutes, the furnace will cycle
back to operation without starting the fire. If the
power failure lasts an extended period of time,
the clinkers will have to be cleaned out of the
burner pot and the fire restarted.
IMPORTANT: When ashes are removed from
the ash pan, they should be placed in a metal
container with a tight fitting lid. The closed
container of ashes should be placed on a non-
combustible floor or on the ground, well away
from all combustible materials pending final
disposal. If the ashes are disposed of by burying
in soil or otherwise dispensed, they should be
retained in the closed container until all clinkers
have thoroughly cooled.
Summary of Settings and Operation
HIGH FIRE Adjustment
Adjustment of the combustion gate (1) on the side
of the combustion blower controls fuel air mixture
during high fire only. Only adjust this openingwhen
the combustion blower is running. Its adjustment
should yield an intense fire that consumes the fuel
at the same rate it is augered in.
LOW FIRE Adjustment
The rate of burn during low fire operation is
controlled by the amount of chimney draft.
Chimney draft must remain below 0.06 water
column inches and be consistant (refer to “Draft
Adjustment” on page 15).
To maintain the fire, the low fire timer will
activate the fuel feed system for a short period
of time followed by a longer period of no fan or
auger activity (LOW FIRE). Adjusting the on and
off cycle time controls the amount of fuel going
into the burner pot during low fire operation.
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LDJ620_E01_R03_2006.03 Models LDJ620-9 and LDJ620-10
The LOW FIRE timer (2) is factory set to cycle at
2 minutes ON and 6 minutes OFF. This is a
suggested setting, but can be adjusted
depending upon user experience.
After approximately 24 hours of operation, a
layer of ash and clinkers forms in the
combustion area. After they form, the OFF time
can be increased to reduce the amount of fuel
consumed during low fire.
NOTE: Timer (3) is used for furnaces in special
applications. Timer (4) is the variable BTU timer
and is used on the LDJ620-10 only.
Variable BTU Timer (LDJ620-10 only)
Below are suggested timer settings to obtain
various BTU outputs from the LDJ620-10
furnace when burning corn. The actual BTU
output may vary depending upon the
characteristics of the fuel being burned. Contact
LDJ Manufacturing for settings for other fuels
(pellets, etc.).
The green arrow indicates the number of
seconds the timer is OFF (“1.5” = 15 seconds)
and the red arrow indicates the number of
seconds the timer is ON.
IMPORTANT: When adjusting the furnace,
always start with the settings for 100,000 BTU
output and then make further adjustments after
the furnace has run for thirty minutes.
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BTU Output Green Arrow Red Arrow Combustion Gate
165,000 0 3.0 full to half open
132,000 1.5 3.0 full to half open
100,000 1.5 2.0 half to one quarter open
90,000 1.5 1.5 half to one quarter open
80,000 1.5 1.0 half to one quarter open

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LDJ620_E01_R03_2006.03
Models LDJ620-9 and LDJ620-10
MAINTENANCE
Daily Maintenance
• Inspect Burner
During use, ash and clinkers will be pushed
out over the top of the burner pot (1) as fuel is
augered in at the bottom. Clinkers that
appear to be stuck to the side of the burner
must be loosened with the included clinker
tool.
• Check Fuel Supply
Check level of corn/pellets in storage bin (2).
Refill as necessary to maintain an adequate
supply.
Weekly Maintenance
• Check Ash Drawer
Check ash drawer (3) and empty as needed.
Ashes should be placed in a metal container
with a tight fitting lid. The closed container of
ashes should be placed on a non-
combustible floor or on the ground, well away
from all combustible materials pending final
disposal. If the ashes are disposed of by
burying in soil or otherwise dispensed, they
should be retained in the closed container
until all clinkers have thoroughly cooled.
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