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Read this manual before using product. Failure to
follow instructions and safety precautions can
result in serious injury, death, or property
damage. Keep manual for future reference.
Part Number: GNA-1435 R0
Revised: April 2020
Downstream Centrifugal Fan
Heater
LP, VP and NG-Fired Heater
Installation, Operation, and Parts Manual
Original Instructions
INSTALLATION AND WIRING MUST BE IN
ACCORDANCE WITH CEC, NEC, AND LOCAL
ELECTRICAL CODES
We strongly recommend that all personnel associated with this equipment be trained in the correct operational
and safety procedures required for this product. This product has been designed and constructed according to
general engineering standards, other local regulations may apply and must be followed by the operator. Use the
sign-off sheet below to record initial and periodic reviews of this manual with all such personnel.
Date Employee Name and Signature Employer Name and Signature
4 GNA-1435 R0
DOWNSTREAM CENTRIFUGAL FAN HEATER – LP, VP AND NG-FIRED HEATER
DOWNSTREAM CENTRIFUGAL FAN HEATER – LP, VP AND NG-FIRED HEATER
GNA-1435 R0 5
CONTENTS
1. Introduction ............................................................................................................................................ 7
1.1 Product Information.................................................................................................................. 7
1.2 Intended Use ............................................................................................................................. 8
1.2.1 Misuse ........................................................................................................................ 8
2. Safety....................................................................................................................................................... 9
2.1 Safety Alert Symbol and Signal Words...................................................................................... 9
2.2 General Product Safety ............................................................................................................. 9
2.3 Heater Safety........................................................................................................................... 10
2.4 Gas Leak Hazards..................................................................................................................... 10
2.5 Grain Bin Fires ......................................................................................................................... 11
2.6 Drives and Lockout/Tagout Safety .......................................................................................... 12
2.7 Personal Protective Equipment............................................................................................... 12
2.8 Safety Equipment .................................................................................................................... 12
2.9 Safety Decals ........................................................................................................................... 12
2.9.1 Decal Installation/Replacement............................................................................... 13
2.9.2 Safety Decal Locations and Details .......................................................................... 13
3. Features................................................................................................................................................. 16
3.1 Downstream Heater ................................................................................................................ 16
3.2 Burner Assembly ..................................................................................................................... 18
3.3 Control Box Assembly ............................................................................................................. 19
4. Installation ............................................................................................................................................ 20
4.1 Installation Safety.................................................................................................................... 20
4.2 Check Shipment....................................................................................................................... 20
4.3 Requirements for Canada ....................................................................................................... 20
4.4 Electrical Connection............................................................................................................... 21
4.4.1 Field and Control Wiring Entry................................................................................. 22
4.4.2 Disconnect ................................................................................................................ 22
4.4.3 Incoming Power Supply............................................................................................ 22
4.4.4 Grounding................................................................................................................. 23
4.5 Fuel Supply .............................................................................................................................. 24
4.6 Install the Heater..................................................................................................................... 27
4.7 Connect the Gas Supply .......................................................................................................... 28
5. Operation .............................................................................................................................................. 30
5.1 Operation Safety ..................................................................................................................... 30
5.2 Pre-Start Check........................................................................................................................ 30
5.3 Start-Up and Operation........................................................................................................... 31
5.3.1 Liquid Propane Startup ............................................................................................ 31
5.3.2 On-Off Heater Operation ......................................................................................... 32
5.3.3 Hi-Low Heater Operation ......................................................................................... 32
5.3.4 Heaters with Modulating Valve ............................................................................... 33
5.4 Shutdown ................................................................................................................................ 34
5.5 Storage Instructions ................................................................................................................ 34
6. Maintenance ......................................................................................................................................... 35
6.1 Maintenance Safety ................................................................................................................ 35
6.2 Maintenance Schedule............................................................................................................ 35
DOWNSTREAM CENTRIFUGAL FAN HEATER – LP, VP AND NG-FIRED HEATER
6 GNA-1435 R0
6.3 Visually Inspect the Downstream Heater ............................................................................... 36
6.4 Annual Maintenance ............................................................................................................... 36
6.5 Fuel Train and Supply Gas Leak Check.................................................................................... 36
6.6 Pressure Regulator Maintenance............................................................................................ 37
6.7 Lubrication Requirements ....................................................................................................... 37
6.8 Electrical Maintenance............................................................................................................ 37
6.9 Access Door ............................................................................................................................. 38
7. Troubleshooting.................................................................................................................................... 39
7.1 General Troubleshooting......................................................................................................... 39
7.2 Heater Diagnostic .................................................................................................................... 39
7.3 Symptoms/Causes/Solutions .................................................................................................. 40
8. Appendix ............................................................................................................................................... 43
8.1 General Drying Operation Information................................................................................... 43
8.2 FENWAL-Related Issues........................................................................................................... 45
8.3 V50 Modulating Valves — Johnson Controls.......................................................................... 49
8.4 Electrical Schematics ............................................................................................................... 52
8.5 Parts Lists................................................................................................................................. 58
9. Warranty ............................................................................................................................................... 70
GNA-1435 R0 7
1. Introduction
Thank you for purchasing a AGI LP, VP and NG-Fired Heater. Follow the instructions in this manual for
safe use of the downstream heater. With proper care, your downstream heater will provide you with
many years of trouble-free operation.
Keep this manual handy for frequent reference and to review with new personnel. A sign-off form is
provided on the inside front cover for your convenience. If any information in this manual is not
understood or if you need additional information, please contact your local AGI representative for
assistance.
This manual should be regarded as part of the equipment. Suppliers of both new and second-hand
equipment are advised to retain documentary evidence that this manual was provided with the
equipment.
1.1. Product Information
Always give your dealer the following product information when ordering parts or requesting service. Please
record the product information in the table below for easy reference.
Local Dealer’s Name and
Address: Phone:
Local Contractor’s Name: Phone:
Service Contractor’s Name: Phone:
Purchase Date: Installation Date:
Model Number: Serial Number:
Fuel Type: Number of Blowers:
Wiring Diagram Drawing Number:
DOWNSTREAM CENTRIFUGAL FAN HEATER – LP, VP AND NG-FIRED HEATER 1. INTRODUCTION
8 GNA-1435 R0
1.2. Intended Use
The downstream heater is intended for use as listed below and described throughout this manual. Use in any
other way is considered as contrary to the intended use.
The downstream heater should be operated, maintained, serviced, and repaired only by persons who are
familiar with its particular characteristics and understand the relevant safety procedures.
Accident prevention regulations and all other generally recognized regulations on occupational health and
safety must be observed at all times.
Any modifications made to the downstream heater may relieve the manufacturer of liability for any resulting
damage or injury.
Intended use for the downstream heater:
• Designed for low temperature drying of field crops.
• Use outdoors only.
Use in any other way is considered as contrary to the intended use and is not covered by the warranty.
1.2.1 Misuse
Do not install/use the downstream heater for/with:
• applications other than as a low temperature heater for drying farm crops.
• heating buildings, sheds, barns, etc.
• finely milled grain dust.
1. INTRODUCTION DOWNSTREAM CENTRIFUGAL FAN HEATER – LP, VP AND NG-FIRED HEATER
GNA-1435 R0 9
2. Safety
2.1. Safety Alert Symbol and Signal Words
This safety alert symbol indicates important safety messages in this manual. When you see
this symbol, be alert to the possibility of injury or death, carefully read the message that
follows, and inform others.
Signal Words: Note the use of the signal words DANGER,WARNING,CAUTION, and NOTICE with the safety
messages. The appropriate signal word for each message has been selected using the definitions below as a
guideline.
Indicates an imminently hazardous situation that, if not avoided, will result in serious injury or
death.
Indicates a hazardous situation that, if not avoided, could result in serious injury or death.
Indicates a hazardous situation that, if not avoided, may result in minor or moderate injury.
Indicates a potentially hazardous situation that, if not avoided, may result in property damage.
2.2. General Product Safety
Read and understand all safety instructions, safety decals, and manuals and follow them when operating or
maintaining the equipment.
• Owners must give instructions and review the information initially and annually with
all personnel before allowing them in the work area. Untrained users/operators
expose themselves and bystanders to possible serious injury or death.
• Use for intended purposes only.
• Do not modify the downstream heater in any way without written permission from the manufacturer.
Unauthorized modification may impair the function and/or safety. Any unauthorized modification will void
the warranty.
• Follow a health and safety program for your worksite. Contact your local occupational health and safety
organization for information.
• Always follow applicable local codes and regulations.
DOWNSTREAM CENTRIFUGAL FAN HEATER – LP, VP AND NG-FIRED HEATER 2. SAFETY
10 GNA-1435 R0
2.3. Heater Safety
Fire and explosion hazards, as well as carbon monoxide poisoning could occur if the heater is
misused. To avoid serious injury or death:
• Shut off and lock out or disconnect power and close valve at
gas source before inspecting or servicing the heater, or when
not in use.
• Do not operate the heater if not properly connected to an
aeration fan.
• Use the heater only with the gas types intended, connecting
alternate fuel sources to the heater can result in fires.
• Do not store or use gasoline or other flammable vapors and
liquids in the vicinity of this or any other appliance.
• Do not remove covers, touch, or service internal components
during operation.
• After burner shutoff, allow the fan to run for five minutes
before removing cover(s).
• Do not use the heater where a high concentration of grain
dust or flammable liquids or vapors exist, such as milled grain
dust.
• Never allow anyone to enter the grain bin when a fan and
heater is operating. Gases given off by the burner (including
carbon monoxide and carbon dioxide) could cause death.
• Never use the heater to heat a building, shed, barn, etc.
because of the hazards posed by the flame and by the output
of carbon monoxide.
2.4. Gas Leak Hazards
If You Smell Gas:
• Turn off gas at the source if possible.
• Do not try to light or relight any appliance.
• Extinguish any flames and remove any sources of ignition from the vicinity of the bin.
• Do not touch any electrical switch.
• Evacuate all personnel from the vicinity of the source of the smell.
• Immediately call your gas supplier. Follow the gas supplier’s instructions.
• If you cannot reach your gas supplier, call the fire department.
2. SAFETY DOWNSTREAM CENTRIFUGAL FAN HEATER – LP, VP AND NG-FIRED HEATER
GNA-1435 R0 11
2.5. Grain Bin Fires
To Prevent Fires:
• Use the bin for its intended use only.
• Ventilate, purge all contaminates, and allow burner, and drying areas to cool inside the
heater, in the heater area and the grain bin before any persons enter these areas.
• Keep the maximum plenum temperature not more than the maximum set point
temperature.
• Do not install or combine with products from other brands/manufacturers. The design and
safety features may not be compatible.
• Grain dust is a fire hazard. Keep all areas (including areas under the perforated floors) free
from dust and fines.
• Screen grain before it goes into a bin to help prevent dust buildup. Using a grain spreader
will help distribute dust/fines.
• Ensure that floor supports don’t block transitions.
• Use the fan to ventilate the bins before igniting the heater. This will reduce the risk of a fire
or explosion from leaking fuel.
• Make certain a qualified electrician wires the components.
In the Event of a Fire:
• Never enter a bin that is on fire. Grain fires can cause serious injury or death.
• Shut off gas at the source. Shut off the fan. Call the fire department.
• Clear everyone out of the work area.
• Seal the fan inlet and any other opening to smother the fire.
• Remove the fan and heater from the transition. Sandbag the transition opening. Flood the
bottom of the bin with water up to about 4” (10 cm) above the perforated floor. This will
protect the floor supports and may help extinguish the fire.
• Direct water toward the source of the fire. If a fire is in the upper portions of the bin, insert
a long pipe with small holes into the grain and deliver water to the source of the fire. Doing
so may help confine the fire, but extinguishing a grain bin fire with water is unlikely to occur.
Emptying the bin is almost always necessary.
• Take note of neighboring structures and fuel tanks, cool them down if necessary.
• Remove all grain from the bin to reach the fire.
• Do not cut holes in the bin to remove the grain. Stay clear of flowing grain, it can bury a
person.
• Grain smoulders for days. Do not restart the fan until all grain has been removed from the
fire area.
DOWNSTREAM CENTRIFUGAL FAN HEATER – LP, VP AND NG-FIRED HEATER 2. SAFETY
12 GNA-1435 R0
2.6. Drives and Lockout/Tagout Safety
Inspect the power source(s) before using and know how to shut down in an emergency.
Whenever you service or adjust your equipment, make sure you shut down your power
source and gas supply and follow lockout and tagout procedures to prevent inadvertent
start-up and hazardous energy release. Know the procedure(s) that applies to your
equipment from the following power sources.
For example:
WARNING
• De-energize, block, and dissipate all sources of hazardous energy.
• Lock out and tag out all forms of hazardous energy.
• Ensure that only 1 key exists for each assigned lock, and that you are the only one that holds that key.
• After verifying all energy sources are de-energized, service or maintenance may be performed.
• Ensure that all personnel are clear before turning on power to equipment.
For more information on occupational safety practices, contact your local health and safety organization.
2.7. Personal Protective Equipment
The following Personal Protective Equipment (PPE) should be worn when operating or maintaining the
equipment.
Work Gloves
• Wear work gloves to protect your hands from sharp and rough edges.
2.8. Safety Equipment
The following safety equipment should be kept on site:
Fire Extinguisher
• Provide a fire extinguisher for use in case of an accident. Store in a highly visible and
accessible place.
First-Aid Kit
• Have a properly-stocked first-aid kit available for use should the need arise, and
know how to use it.
2.9. Safety Decals
• Keep safety decals clean and legible at all times.
2. SAFETY DOWNSTREAM CENTRIFUGAL FAN HEATER – LP, VP AND NG-FIRED HEATER
GNA-1435 R0 13
• Replace safety decals that are missing or have become illegible. See decal location figures that follow.
• Replaced parts must display the same decal(s) as the original part.
• Replacement safety decals are available free of charge from your distributor, dealer, or factory as applicable.
2.9.1 Decal Installation/Replacement
1. Decal area must be clean and dry, with a temperature above 50°F (10°C).
2. Decide on the exact position before you remove the backing paper.
3. Align the decal over the specified area and carefully press the small portion with the exposed sticky backing
in place.
4. Slowly peel back the remaining paper and carefully smooth the remaining portion of the decal in place.
5. Small air pockets can be pierced with a pin and smoothed out using the sign backing paper.
2.9.2 Safety Decal Locations and Details
Replicas of the safety decals that are attached to the downstream heater and their messages are shown in the
figure(s) that follow. Safe operation and use of the downstream heater requires that you familiarize yourself
with the various safety decals and the areas or particular functions that the decals apply to, as well as the safety
precautions that must be taken to avoid serious injury, death, or damage.
Figure 1. Safety Decal Locations
601-1995
601-3729
601-3582
DOWNSTREAM CENTRIFUGAL FAN HEATER – LP, VP AND NG-FIRED HEATER 2. SAFETY
14 GNA-1435 R0
Table 1. Safety Decals
Part Number Description
601-1995
(Control panel cover, outside)
To prevent serious injury or death:
• Only qualified personnel should service
electrical components.
• Disconnect and lockout power before
inspecting or servicing unit.
• Keep electrical components in good repair.
ELECTROCUTION HAZARD
WARNING
601-3729
Pour éviter tout risque de brûlure provoqué
par des composants internes:
• NE PAS retirer le couvercle, ni toucher ou changer
des composants internes pendant l’utilisation.
• Après l’arrêt du brûleur, laisser le ventilateur
tourner pendant 5 minutes avant de retirer le
couvercle.
RISQUE DE BRÛLURE
CAUTION
ATTENTION
To prevent burns from internal components:
• DO NOT remove cover, touch, or service internal
components during operation.
• After burner shutoff, allow fan to run for 5 minutes
before removing cover.
BURN HAZARD
2. SAFETY DOWNSTREAM CENTRIFUGAL FAN HEATER – LP, VP AND NG-FIRED HEATER
GNA-1435 R0 15
Table 1 Safety Decals (continued)
Part Number Description
601-3582
(Heater housing)
If the information in the manual is not followed exactly, a fire
or explosion may result causing property damage, personal
injury or loss of life
.
•
DO NOT store or use gasoline or other flammable vapours
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.
• Extinguish any open flames.
• DO NOT touch any electrical switch.
• Immediately call your gas supplier, call the fire
department.
• Installation and service must be performed by a qualified
installer, service agency or the gas supplier.
FOR YOUR SAFETY - The use and storage of gasoline and
other flammable vapors and liquids in open containers in the
vicinity of this appliance is hazardous.
Improper installation, adjustment, alteration, service or
maintenance can cause property damage, injury or death.
Read the installation, operating and maintenance instructions
thoroughly before installing or servicing this equipment.
Si les informations donn
ées dans le mode d’emploi ne sont pas
respectées à la lettre, un incendie ou une explosion pourrait survenir
et entraîner des dommages matériels, des blessures ou la mort.
• Ne pas entreposer ni utiliser d’essence ou autres vapeurs ou liquides
inflammables à proximité de cet appareil ou de tout autre appareil.
• Quoi faire si vous sentez une odeur de gaz
• N’allumez aucun appareil ;
• Éteindre toutes les flammes nues ;
• Ne touchez à aucun interrupteur ;
• Appelez immédiatement votre fournisseur de gaz. Suivez les
instructions du fournisseur de gaz ;
• Si vous ne pouvez rejoindre le fournisseur, appelez le service des incendies.
• L’installation et les réparations doivent être confiés à un installateur
ou un réparateur qualifié ou au fournisseur de gaz.
POUR VOTRE S
ÉCURITÉ -
Il est dangereux d’utiliser et d’entreposer
de l’essence et autres vapeurs et liquides inflammables se trouvant
dans des contenants ouverts à proximité de cet appareil.
Une installation, un réglage, une modification, une réparation ou un
entretien inadéquats peuvent entraîner des dommages matériels, des
blessures ou la mort. Lire attentivement les instructions d’installation,
de fonctionnement et d’entretien avant de procéder à l’installation ou
à la réparation de cet appareil.
WARNING AVERTISSEMENT
DOWNSTREAM CENTRIFUGAL FAN HEATER – LP, VP AND NG-FIRED HEATER 2. SAFETY
16 GNA-1435 R0
3. Features
This section covers the main features of the downstream heater.
3.1. Downstream Heater
Note
AGI Downstream Centrifugal Fan Heaters are sized according to the centrifugal fan’s power source and
the motor HP rating.
MOUNTING FLANGE
TO
CENTRIFUGAL FAN
BURNER
ASSEMBLY
FUEL TRAIN
ASSEMBLY
(LP or NG)
CONTROL BOX
ASSEMBLY
MOUNTING FLANGE
TO
SHUTTERS OR
TRANSITION
AIR FLOW
DIRECTION
TRANSITION
HI LIMIT
BOX
3. FEATURES DOWNSTREAM CENTRIFUGAL FAN HEATER – LP, VP AND NG-FIRED HEATER
GNA-1435 R0 19
3.3. Control Box Assembly
Important
The power “IN” to the heater control box comes from the centrifugal fan - this must be wired such that
there is no power to the heater unless the fan is running.
1.5A FUSE
ON / OFF
SWITCH
3A FUSE
12’ [3.6 METERS]
POWER “IN” CABLE
(CONNECTED TO FAN)
FENWAL
CONTROL
BOARD
BURNER
HI - LIMIT
SAFETY CONTROL
TRANSITION
HI - LIMIT
SAFETY CONTROL
(INSIDE BOX)
TERMINAL
BLOCK
DOWNSTREAM CENTRIFUGAL FAN HEATER – LP, VP AND NG-FIRED HEATER 3. FEATURES
20 GNA-1435 R0
4. Installation
Before continuing, ensure you have completely read and understood this manual’s
Safety section, in addition to the safety information in the section(s) below.
4.1. Installation Safety
• All installation and servicing operations are to be carried out by a qualified technician.
• The equipment shall be installed in accordance with applicable local codes and regulations.
• Do not take chances with safety. The components can be large, heavy, and hard to handle.
Always use the proper tools, rated lifting equipment, and lifting points for the job.
• Always have two or more people installing the downstream heater.
• Make sure you have sufficient lighting for the work area.
• Tighten all fasteners according to their specifications. Do not replace or substitute bolts,
nuts, or other hardware that is of lesser quality than the hardware supplied by the
manufacturer.
4.2. Check Shipment
Inspect the downstream heater and accessories on receipt to ensure that all items have arrived and that none
are damaged.
Report missing or damaged parts immediately to ensure that proper credit is received from AGI or your
distributor/dealer, and to ensure that any missing parts can be shipped quickly to avoid holding up the
installation.
Important
Do not use damaged components.
4.3. Requirements for Canada
• “The equipment shall be installed in accordance with the Natural Gas and Propane Installation Code, CSA
B149.1 and the Propane Storage and Handling Code, CSA B149.2, or applicable provincial regulations, which
should be carefully followed in all cases. Authorities having jurisdiction should be consulted before
installations are made”.
• Electric disconnect switch having adequate ampacity (if not provided as part of the dryer) shall be installed
in accordance with the Canadian Electric Code. Part 1, CSA C22.1.
4. INSTALLATION DOWNSTREAM CENTRIFUGAL FAN HEATER – LP, VP AND NG-FIRED HEATER
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