JOHN DEERE PORTABLE FORCED AIR HEATERS
OWNER’S MANUAL
MODELS: AC-70, AC-115, AC-165
IMPORTANT: Read and understand this manual before
assembling, starting, or servicing heater.
Improper use of heater can cause serious injury. Keep
this manual for future reference.
TABLE OF CONTENTS
Safety Information ............................................... 2
Unpacking ........................................................... 2
Product Identification ........................................... 3
Assembly ............................................................. 4
Theory of Operation ............................................ 5
Fuels .................................................................... 5
Ventilation ........................................................... 6
Operation ............................................................ 6
Storing, Transporting, or Shipping ....................... 7
Save this manual for future reference.
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Preventative Maintenance Schedule ................... 7
Troubleshooting ................................................... 8
Service Procedures ............................................. 9
Wiring Diagrams ............................................... 15
Illustrated Parts Breakdown and Parts List ....... 16
Specifications .................................................... 22
Accessories ....................................................... 23
Warranty and Repair Service ............................ 24
SAFETY INFORMATION
IMPORTANT: Read this owner’s
manual carefully and completely
before trying to assemble, operate, or service this heater.
Improper use of this heater can
cause serious injury or death
from burns, fire, explosion,
electrical shock, and carbon
monoxide poisoning.
DANGER: Carbon monoxide
poisoning may lead to death!
Early signs of carbon monoxide poisoning resemble the flu, with headaches, dizziness, and/or
nausea. If you have these signs, the heater may not
be working properly. Get fresh air at once! Have
heater serviced. Some people (such as pregnant
women, persons with heart or lung disease, persons
with anemia, those under the influence of alcohol,
and those at high altitudes) are more affected by
carbon monoxide than others.
1. Use only kerosene, #1/#2 diesel/fuel oil, JET A
or JP-8 fuels to avoid risk of fire or explosion.
Never use gasoline, naphtha, paint thinners,
alcohol, or other highly flammable fuels.
2. Use only with the electrical voltage and frequency specified on model plate.
3. Heater must be grounded. Use only a properly
grounded three-wire extension cord. Plug into
grounded outlet only.
4. Use only in areas free of flammable vapors or
high dust content.
5. Minimum clearance from any combustible
materials: 8 feet (244 cm) from hot air outlet;
6 feet (183 cm) from top; and 2 feet (61 cm)
from sides and inlet.
6. Locate heater on a stable and level surface
while hot or operating or a fire may occur.
7. Use only in well ventilated areas. Provide ventilation of at least three square feet (2,800 square
cm) for each 100,000 Btu/Hr of rating.
8. Keep children and animals away from heater
at all times.
9. Never start heater when combustion chamber
is hot or if fuel has accumulated in combustion chamber.
10. When used with a thermostat, heater may start
at anytime.
11. When heater is moved or stored, it must be in
a level position or fuel spillage may occur.
12. Use heater only in accordance with local
ordinances and codes.
13. Never use gasoline, crankcase drainings,
naphtha, paint thinners, alcohol, or other
highly flammable fuels.
14. Never use heater where gasoline, paint thinner, or other highly flammable vapors are
present.
15. Never use heater in living or sleeping areas.
16. Never leave a heater plugged in without adult
supervision if children or animals are likely to
be present.
17. Never move, handle, refuel, or service a hot,
operating, or plugged-in heater.
18. Never block air inlet at motor end (rear) of
heater.
19. Never attach duct work to front of heater.
20. Never attach heater to external fuel tank.
UNPACKING
1. Remove all protective packaging that has been
applied to heater for shipment
2. Remove heater from carton.
3. Check heater for any shipping damage. If damage is found, promptly inform dealer where
heater was purchased.
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111168-01A2
PRODUCT IDENTIFICATION
Hot Air
Outlet
Lower
Shell
Fuel Tank
Side Cover
Ignition Control Assembly
(assembly on inside of side cover)
Figure 2 - 70 Models
Hot Air
Outlet
Lower Shell
Nose Cone Guard
Upper Shell
Upper Shell
Handle
Fan Guard
Fan Guard
Thermostat
Knob
Air Filter End
Cover
Fuel Cap
Power Cord
Thermostat Knob
Fuel Cap
Side Cover
Ignition Control Assembly
(assembly on inside of side cover)
Figure 3 - 115/165 Models
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Power Cord
Fuel Tank
3111168-01A
ASSEMBLY
(FOR 70 MODELS ONLY)
These models are furnished with a nose cone
guard. Nose cone guard and mounting screws are
found in the shipping carton.
Tools Needed
• 5/16" Nut Driver or Wrench
1. Place nose cone guard on top of upper shell
flange. Make sure nose cone guard is on hot
air outlet end of heater.
2. Insert screws through nose cone guard and
upper shell flange.
3. Tighten screws firmly.
Nose Cone
Guard
Screw
Hot Air
Outlet
Upper Shell
Flange
(FOR 115 AND 165 MODELS ONLY)
These models are furnished with wheels and a front
handle. Some models are furnished with a rear
handle also. Wheels, handle(s), and the mounting
hardware is found in the shipping carton.
Tools Needed
• Medium Phillips Screwdriver
• 3/8" Open or Adjustable Wrench
• Hammer
1. Slide axle through wheel support frame. Install
wheels on axle.
IMPORTANT: Place extended hub of wheel
toward wheel support frame.
2. Place cap nuts on axle ends. Gently tap with
hammer to secure.
3. Place heater on wheel support frame assembly. Make sure air inlet end of heater is over
wheels.
4. Place front handle on top of fuel tank flange.
Insert screws through handle(s), fuel tank
flange and wheel support frame. Attach nut
finger tight after each screw is inserted.
5. Tighten all nuts firmly.
Front
Handle
Hot Air
Outlet
Rear Handle
(If Equipped)
Screw
Figure 4 - Nose Cone Guard Assembly,
70 Models Only
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Fuel Tank
Flange
Wheel
Support
Frame
Wheel
Nut
Cap Nut
Figure 5 - Wheel and Handle Assembly,
115/165 Models Only
Axle
Air Inlet
Extended Hub
111168-01A4
THEORY OF OPERATION
The Fuel System: The air pump forces air through
the air line. The air is then pushed through the
nozzle. This air causes fuel to be lifted from the
tank. A fine mist of fuel is sprayed into the combustion chamber.
The Air System:
fan pushes air into and around the combustion
The motor turns the fan. The
chamber. This air is heated and provides a stream
of clean, hot air.
The ignition control assembly provides power to
the ignitor. This ignites the fuel/air mixture in the
combustion chamber.
The Flame-Out Control System:
the heater to shut down if the flame goes out.
This system causes
Clean
Heated
Air Out
Fuel Tank
Combustion Chamber
Nozzle
Air For Fuel
System
Figure 6 - Cross Section Operational View
Ignitor
Fuel
Filter
FUELS
WARNING: Use only kerosene, #1/#2 diesel/fuel oil, JET
A or JP-8 fuels to avoid risk
of fire or explosion. Never
use gasoline, oil drained from
crankcases, naphtha, paint
thinners, alcohol or other highly
flammable fuels.
Use only kerosene, #1/#2 diesel/fuel oil, JET A
or JP-8 fuels. Heavier fuels such as No. 2 fuel
oil or No. 2 diesel fuel may also be used but will
result in:
• noticeable odor
• additional fuel filter maintenance
• the need for nontoxic, anti-icer additives in very
cold weather
Motor
Fan
Air Line
To Burner
Air For Combustion
And Heating
Do not use fuels heavier than No. 2 grade or
heavy oils such as oil drained from crankcases.
These heavy oils will not ignite properly and will
contaminate the heater.
IMPORTANT: Use a KEROSENE ONLY (blue)
or DIESEL ONLY (yellow) storage container. Be
sure storage container is clean. Foreign matter
such as rust, dirt, or water will cause the ignition
control assembly to shut down heater. Foreign
matter may also require heater's fuel system to be
frequently cleaned.
Air Pump
Air Intake
Filter
Cool
Air In
Air
Output
Filter
Ignition Control
Assembly
Fuel
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5111168-01A
VENTILATION
WARNING:Provide a fresh air
opening of at least three square
feet (2,800 square cm) for each
100,000 Btu/Hr rating. Provide
extra fresh air if more heaters
are being used. The minimum
ventilation requirements must
be followed to avoid risks associated with carbon monoxide
poisoning. Make certain these
requirements are met prior to
operating heater.
Example: A 165 model heater requires one of
the following:
• a two-car garage door (16 ft. [4.88 m] wide
opening) raised four inches (10.16 cm)
• a single-car garage door (9 ft. [2.74 m] wide
opening) raised seven inches (17.78 cm)
• two, thirty-inch (76.20 cm) windows raised
twelve inches (30.48 cm)
OPERATION
IMPORTANT: Review and understand the warnings in the Safety
Information section, page 2.
They are needed to safely operate this heater. Follow all local
ordinances and codes when
using this heater.
Extension Cord Size Requirement
6 to 10 feet (1.8 to 3 meters) long, use 18 AWG
(0.75 mm2) rated cord
11 to 100 feet (3.3 to 30.5 meters) long, use
16 AWG (1.0 mm2) rated cord
101 to 200 feet (30.8 to 61 meters) long, use
14 AWG (1.5 mm2) rated cord
6.
Plug extension cord into standard 120 volt/60
hertz, 3-prong grounded outlet.
preheat for five seconds, then heater will start.
7. For thermostat models 55T, 70T, 115T, and
165T, adjust thermostat knob to the desired
setting. Note: A cold heater may affect
the thermostat setting. This thermostat is a
general-heating control. It is not intended for
precise temperature control. Adjust thermostat
until heater cycles at the desired setting.
Note:
Ignitor will
TO STOP HEATER
Unplug extension cord from outlet.
TO RESTART HEATER
1. Unplug extension cord from outlet and wait
10 seconds. (Wait two minutes if heater has
been running.)
2. Repeat steps under To Start Heater.
TO START HEATER
1. Follow all ventilation and safety information.
2. Fill fuel tank with kerosene, #1/#2 diesel/fuel
oil, JET A or JP-8 fuels.
3. Attach fuel cap.
4. For thermostat models 55T, 70T, 115T, and
165T, turn thermostat knob clockwise to the
high position.
5. Plug heaterʼs power cord into approved,
grounded, three-wire extension cord. Extension
cord must be at least six feet (1.8 meters) long.
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111168-01A6
STORING, TRANSPORTING,
OR SHIPPING
Note: If shipping, transport companies require
fuel tanks to be empty.
1. Drain fuel tank.
2. Replace drain plug if provided.
Some models have drain plug on un-
Note:
derside of fuel tank. If so, remove drain plug
to drain all fuel. If heater does not have drain
plug, drain fuel through fuel cap opening. Be
sure all fuel is removed.
3. If any debris is noted in old fuel, add 1 or 2
quarts of clean kerosene to tank, stir, and drain
again. This will prevent excess debris from
clogging filters during future use.
4. Replace fuel cap or drain plug. Properly dispose of old and dirty fuel. Check with local
automotive service stations that recycle oil.
5. If storing, store heater in dry place. Make sure
storage place is free of dust and corrosive
fumes.
IMPORTANT:
months for use during next heating season. Using
old fuel could damage heater.
Do not store kerosene over summer
PREVENTATIVE MAINTENANCE SCHEDULE
WARNING: To avoid risk of burn and electrical shock, never at-
tempt to service heater while it is plugged in, operating, or hot.
Item How Often How To
Fuel tank Flush every 150-200 hours See Storing, Transporting, or
of operation or as needed Shipping
Air output and lint filters Replace every 500 hours of See Air Output, Air Intake,
operation or once a year and Lint Filters, page 10
Air intake filter Wash and dry with soap and See Air Output, Air Intake,
water every 500 hours of and Lint Filters, page 10
operation or replace as needed
Fuel filter Clean twice a heating season See Fuel Filter, page 11
or replace as needed
Ignitor None required
Fan blades Clean every season or See Fan, page 9
as needed
Motor Not required/permanently
lubricated
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7111168-01A
TROUBLESHOOTING
WARNING: Never service heater while it is plugged in, operating,
or hot. Severe burns and electrical shock can occur.
FAULT CONDITION
Motor does not start five seconds
after heater is plugged in
Motor starts and runs but heater
does not ignite
POSSIBLE CAUSE
1. No power to heater
2. Thermostat setting is too low
WARNING: High voltage!
3. Bad electrical connection between motor and ignition control assembly or ignition control
assembly and power cord
4. Binding pump rotor
5. Defective ignition control assembly
6. Defective motor
1. No fuel in tank
2. Pump pressure incorrect
3. Dirty fuel filter
4. Obstruction in nozzle
5. Water in fuel tank
WARNING: High voltage!
6. Bad electrical connection
between ignitor and ignition
control assembly
7. Defective ignitor
8. Defective ignition control assembly
REMEDY
1. Check circuit breaker in electrical panel
2. Turn thermostat knob to a
higher setting
3. Check all electrical connections. See Wiring Diagrams,
page 15
4. If fan does not turn freely, see
Pump Rotor, page 14
5. Replace ignition control assembly
6. Replace motor
1. Fill tank with kerosene
2. See Pump Pressure Adjust-
ment, page 10
3. See Fuel Filter, page 11
4. See Nozzle Assembly, page 12
5. Drain and flush fuel tank with
clean kerosene. See Storing,
Transporting, or Shipping,
page 7
6.
Check electrical connections.
See
Wiring Diagrams ,
7. Replace ignitor, see page 11
8. Replace ignition control assembly
page 15
Heater ignites but ignition control
assembly shuts heater off after a
short period of time
1. Pump pressure incorrect
2. Dirty air intake, air output,
and/or lint filter
3. Dirty fuel filter
4. Obstruction in nozzle
5. Photocell assembly not properly
installed (not seeing the flame)
6. Dirty photocell lens
WARNING: High voltage!
7. Bad electrical connection between photocell and ignition
control assembly
8. Defective photocell
9. Defective ignition control assembly
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1. See Pump Pressure Adjust-
ment, page 10
2. See Air Output, Air Intake, and
Lint Filters, page 10
3. See Fuel Filter, page 11
4. See Nozzle Assembly, page 12
5. Make sure photocell boot is
properly seated in bracket
6. Clean photocell lens
7. Check electrical connections.
See Wiring Diagrams, page 15
8. Replace photocell
9. Replace ignition control assembly
111168-01A8
SERVICE PROCEDURES
WARNING: To avoid risk of
burn and electrical shock, never
attempt to service heater while it
is plugged in, operating, or hot.
UPPER SHELL REMOVAL
1. Remove screws along each side of heater using
5/16" nut-driver. These screws attach upper
and lower shells together. See Figure 7 or 8.
2. Lift upper shell off.
3. Remove fan guard.
Screw
Upper Shell
Fan Guard
FAN
IMPORTANT: Remove fan from motor shaft
before removing motor from heater. The weight
of the motor resting on the fan could damage the
fan pitch (see Figure 9).
1. Remove upper shell (see Figure 7 or 8).
2. Use 1/8" allen wrench to loosen setscrew
which holds fan to motor shaft.
3. Slip fan off motor shaft.
4. Clean fan using a soft cloth moistened with
kerosene or solvent.
5. Dry fan thoroughly.
6. Replace fan on motor shaft. Place fan hub flush
with end of motor shaft (see Figure 10).
7.
Place setscrew on flat of shaft. Tighten
setscrew firmly (40-50 inch-pounds/4.5-
5.6 n-m).
8. Replace fan guard and upper shell.
Fan
Setscrew
Figure 7 - Upper Shell Removal
(70 Model Only)
Screw
Figure 8 - Upper Shell Removal
(115/165 Models Only)
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Upper Shell
Fan Guard
Motor Shaft
Figure 9 - Fan, Motor Shaft, and
Setscrew Location
Setscrew
Motor
Motor Shaft
Figure 10 - Fan Cross Section
Fan
Flush
9111168-01A
SERVICE PROCEDURES
Continued
AIR OUTPUT, AIR INTAKE AND LINT
FILTERS
1.
Remove upper shell (see Figure 7 or 8, page 9).
2. Remove filter end cover screws using 5/16"
nut-driver. See Figure 11 or 12.
3. Remove filter end cover.
4. Replace air output and lint filters.
5. Wash or replace air intake filter (see Preventa-
tive Maintenance Schedule, page 7).
6. Replace filter end cover.
7. Replace fan guard and upper shell.
IMPORTANT: Do not oil filters.
Air Intake
Filter
Filter End
Cover
Lint Filter
Air Output Filter
Figure 11 - Air Output, Air Intake, and
Lint Filters, 70 Model
Fan
Guard
PUMP PRESSURE ADJUSTMENT
1. Remove pressure gauge plug from filter end
cover (see Figure 13).
2. Install accessory pressure gauge (part number
HA1180).
3. Start heater (see Operation, page 6). Allow
motor to reach full speed.
4. Adjust pressure. Turn relief valve to right to
increase pressure. Turn relief valve to left to
decrease pressure. See specifications correct
pressure for each model (see Figure 14).
5. Remove pressure gauge. Replace pressure
gauge plug in filter end cover.
Relief Valve
Pressure
Gauge
Plug
Figure 13 - Pressure Gauge Plug
Removal (70 Model Shown)
Pump
Model Pressure
70 4.7 PSI
115 5.1 PSI
165 5.6 PSI
Pressure
Gauge
Air Intake
Filter
Filter End
Cover
Lint Filter
Air Output
Filter
Figure 12 - Air Output, Air Intake, and
Lint Filters, 115/165 Models
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Fan
Guard
Figure 14 - Adjusting Pump Pressure
(70 Model Shown)
111168-01A10
SERVICE PROCEDURES
Continued
FUEL FILTER
1. Remove side cover screws using 5/16" nutdriver.
2. Remove side cover.
3. Pull upper fuel line off fuel filter neck (see
Figure 15 or 16).
4. Carefully pry bushing, fuel filter, and lower
fuel line (115/165 models only) out of fuel
tank (see Figure 16).
5. Wash fuel filter with clean fuel and replace in
tank.
6. Attach upper fuel line to fuel filter neck.
7. Replace side cover.
Fuel Filter
Side
Cover
IGNITOR
1. Remove upper shell and fan guard (See Upper
Shell Removal, page 9).
2. Remove fan (see page 9).
3.
Remove 4 side cover screws with a 5/16"
nut driver. Remove side cover (see Figures
15 and 16).
4. Disconnect ignitor wires (yellow) from ignition control assembly (see Figure 17). Pull
the ignitor wires up through the hole in the
lower shell.
5. Disconnect fuel line hose and air line hose.
Remove photocell from photocell bracket (see
Figure 17).
6. Remove combustion chamber. Stand combustion chamber on end with nozzle adapter
bracket on top (see Figure 18).
Nozzle
Combustion
Chamber
Air Line
Hose
Fuel Line
Hose
Photocell
Bracket
Adapter
Bracket
Ignitor
Ignitor Wire
(Yellow)
Upper Fuel Line
Figure 15 - Fuel Filter Removal,
70 Model
Fuel Filter, Bushing,
and Lower Fuel Line
Side
Cover
Upper Fuel Line
Figure 16 - Fuel Filter Removal,
115/165 Models
Photocell
Assembly
Side Cover
Figure 17 - Disconnecting Ignitor Wires
from Ignition Control Assembly
Ignitor Screw/
Washer Assembly
Ignitor Element
Photocell
Bracket
Combustion Chamber
Figure 18 - Ignitor Replacement
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Ignition
Control
Assembly
Ignitor
Nozzle
Adapter
Bracket
Nozzle Adapter
Bracket Opening
11111168-01A
SERVICE PROCEDURES
Continued
7. Remove ignitor screw with a 1/4" nut driver.
Carefully remove ignitor from nozzle adapter
bracket.
CAUTION: Do not bend or
strike ignitor element. Handle
with care.
8. Carefully remove replacement ignitor from
styrofoam packing.
9. Carefully guide ignitor into opening in nozzle
adapter bracket. Do not strike ignitor element.
Attach ignitor to nozzle adapter bracket with
screw using a 1/4" nut driver (see Figure 18, page
11). Torque 8 to 15 in. lbs. Do not over torque.
10. Replace combustion chamber.
11. Route the ignitor wires back down through
the hole in the lower shell. Connect wires to
the ignition control assembly (see Figure 17,
page 11).
12. Replace side cover (see Figures 15 and 16,
page 11).
13. Connect and route fuel line hose and air line
hose to nozzle adapter assembly. See Fuel and
Air Line Replacement and Proper Routing,
page 13.
14. Replace photocell in photocell bracket. Route
wires as shown in Figure 19, 20, or 21.
15. Replace fan (see Fan, page 9).
16. Replace fan guard and upper shell (see Upper
Shell Removal, page 9).
Combustion
Chamber
Burner Strap
Photocell
Bracket
Air Line
Hose
Figure 19 - Removing Air and Fuel Line
Hoses, (70 Model Only)
Nozzle/
Adapter
Assembly
Fuel Line
Hose
Combustion
Chamber
Burner Strap
Photocell
Bracket
Air Line Hose
Figure 20 - Removing Air and Fuel Line
Hoses, (115 Model Only)
Combustion
Chamber
Burner Strap
Photocell
Bracket
Air Line
Hose
Figure 21 - Removing Air and Fuel Line
Hoses (165 Model Only)
Nozzle/
Adapter
Assembly
Fuel Line
Hose
Nozzle/
Adapter
Assembly
Fuel Line
Hose
NOZZLE ASSEMBLY
1. Remove upper shell (see Upper Shell Removal, page 9).
2. Remove fan (see Fan, page 9).
3. Remove fuel and air line hoses from nozzle
assembly (see Figure 19, 20, or 21).
4. Turn nozzle assembly 1/4 turn to left and pull
toward motor to remove (see Figure 22).
5. Place plastic hex-body into vise and lightly
tighten.
Burner Strap
Nozzle
Assembly
Figure 22 - Removing Nozzle Assembly,
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All Models
111168-01A12
SERVICE PROCEDURES
Continued
6. Carefully remove nozzle from the nozzle adapter
using 5/8" socket wrench. See Figure 23.
7. Blow compressed air through face of nozzle.
This will free any dirt in nozzle area.
8. Inspect nozzle sleeve for damage.
9. Replace nozzle into nozzle adapter until
nozzle seats. Tighten 1/3 turn more using
5/8" socket wrench (40-45 inch-pounds). See
Figure 23.
10. Attach nozzle assembly to burner strap (see
Figure 22).
11. Attach fuel and airline hoses to nozzle adapter
assembly. See Fuel and Air Line Replacement
and Proper Routing.
12. Replace fan (see Fan, page 9).
13. Replace fan guard and upper shell (see Upper
Shell Removal, page 9).
Nozzle
Face
Nozzle
Nozzle Adapter
Air Line Fitting
Figure 23 - Nozzle and Nozzle Adapter,
All Models
Nozzle
Sleeve
Fuel Line Fitting
FUEL AND AIR LINE REPLACEMENT
AND PROPER ROUTING
1. Remove upper shell (see Upper Shell Removal, page 9).
2. Remove side cover screws using 5/16" nut
driver (see Figure 15 or 16, page 11).
3. Remove side cover.
4. Inspect fuel and air line hoses for cracks and/or
holes. If fuel line hose is damaged, disconnect
from nozzle adapter (see Figure 19, 20, or 21,
page 12) and from fuel filter (see Fuel Filter,
page 11). If air line hose is damaged, disconnect from nozzle adapter (see Figure 19, 20,
or 21, page 12) and from barb fitting on pump
end cover (see Figure 24).
5. Install new air and/or fuel line. Attach one
end of air line hose to barb fitting on pump
end cover (see Figure 24) and the other end to
nozzle adapter (see Figure 19, 20, or 21, page
12). Attach one end of fuel line hose to fuel
filter (see Fuel Filter, page 11) and the other
end to nozzle adapter (see Figure 19, 20, or
21, page 12).
Note: Route hoses as shown in Figure 19, 20,
or 21, page 12, according to model. Hoses are
not to touch photocell bracket.
6. Replace side cover.
7. Replace upper shell and fan guard (see Upper
Shell Removal, page 9).
Pump End Cover
Model 70
Figure 24 - Air Hose to Barb Fitting
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Barb
Fitting
Barb
Fitting
Air Hose
115/165
Models
13111168-01A
SERVICE PROCEDURES
Continued
PUMP ROTOR
(Procedure if Rotor is Binding)
1. Remove upper shell (see Upper Shell Removal, page 9).
2. Remove filter end cover screws using 5/16"
nut-driver (see Figure 25 or 26).
3. Remove filter end cover and air filters.
4. Remove pump plate screws using 5/16" nutdriver.
5. Remove pump plate.
6. Remove rotor, insert, and blades.
7. Check for debris in pump. If debris is found,
blow out with compressed air.
8. Install insert and rotor.
9. Check gap on rotor. Adjust to .003"/.004"
(.076-.101 mm) if needed (see Figure 27).
Note: Rotate Rotor one full turn to insure the gap
is .003"/.004" (.076-.101 mm) at tightest position.
Adjust if needed.
10. Install blades, pump plate, air filters, and filter
end cover.
11. Replace fan guard and upper shell (see Upper
Shell Removal, page 9).
12. Adjust pump pressure (see Pump Pressure
Adjustment, page 10).
Note: If rotor is still binding, proceed as follows.
13. Perform steps 1 thru 6.
14. Place fine grade sandpaper (600 grit) on flat
surface. Sand rotor lightly in “figure 8” motion
four times (see Figure 28).
15. Reinstall insert and rotor.
16. Perform steps 10 thru 12.
Blade
Pump Plate
Air Intake Filter
Insert
Rotor
Air Output
Filter
Fan Guard
Figure 25 - Rotor Location, 70
Insert
Rotor
Figure 26 - Rotor Location, 115/165
Models
Blade
Pump Plate
Air Output
Filter
Models
Gap Adjusting Screw
Air Intake Filter
Filter End Cover
.003"/.004"
(.076-.101 mm)
Gap Measured
With Feeler
Gauge
Filter End
Cover
Fan Guard
Blade
Figure 27 - Gap Adjusting Screw
Figure 28 - Sanding Rotor
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Rotor
Gap Adjusting Screw
Locations
Sandpaper
111168-01A14
SERVICE PROCEDURES
Continued
IGNITION CONTROL ASSEMBLY
WARNING: High Voltage!
1. Unplug heater.
2. Remove side cover screws (4) using 5/16"
nut-driver to expose ignition control assembly
(see Figure 15 or 16, page 11).
3. Remove fuse cover (see Figure 29).
4. Remove fuse from fuse clips (see Figure 29).
5. Replace fuse with fuse of the same type and
rating (GMA-10). Do not substitute a fuse
with a higher current rating.
WIRING DIAGRAMS
Photocell
Photocell
Ignitor
Motor Return
AC Neutral (L2)
120V (L1)
Ignition Control Assembly
Motor
Ignitor
6. Replace fuse cover (see Figure 29).
7.
Replace side cover (see Figure 15 or 16, page 11).
Fuse
Clips
Figure 29 - Replacing Fuse
Blue
Photocell
Blue
White
Green
Red
Black
White
Motor
Green
Yellow
Po
12
w
0V
Fuse
Cover
Fuse
ug
Pl
er
Hz
0
/6
Yellow
Ignitor
Figure 30 - Wiring Diagram for non-thermostat Models
Photocell
Photocell
Ignitor
Motor Return
AC Neutral (L2)
120V (L1)
Ignition Control Assembly
Motor
Ignitor
Blue
Blue
White
Green
Red
Black
Yellow
Photocell
White
Green
Motor
Yellow
Thermostat
Ignitor
Figure 31 - Wiring Diagram for 70/115/165 Thermostat Models
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ug
Pl
r
we
Po
12
Black
0V
z
0H
/6
15111168-01A
MODEL AC-70
ILLUSTRATED PARTS BREAKDOWN
4
5
7
8
22
35
41
40
36
3
9
6
21
20
28
30
29
1
2
9-1
9-6
9-2
9-5
11
9-4
9-3
10
18
23
25
16
24
27
12
13
26
39
38
31
33
19
32
17
37
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34
15
14
111168-01A16
PARTS LIST
MODEL AC-70
This list contains replaceable parts used in your
heater. When ordering
parts, be sure to provide
the correct model and serial numbers (from the
model plate), then the part
number and description of
the desired part.
KEY PART
NO. NUMBER DESCRIPTION QTY.
1 M51104-01 Handle 1
2 098511-67
3 M11084-29 Screw, #10-16 x 3/4" 2
4 108631-01 Screw, #10-16 x 1" 2
5
098512-51 Combustion Chamber 1
6 M10908-2 Screw, #6-32 x 3/8" 2
7 103154-03 Photocell Bracket 1
8 M16656-24 Photocell Assembly 1
9 ** Burner Head Assembly
9-1
HA3026 Nozzle Assembly 1
9-2 HA1000 Ignitor Kit 1
9-3 104056-01 Nozzle Adapter 1
9-4
102336-01 Nozzle Adapter Bracket 1
9-5 M10908-75 Screw, Hex Head, Tapping 1
9-6 103347-01 Belleville Washer 1
10 M11084-26 Screw, #10-16 x 3/8" 2
11
M29678 Fan 1
12 ** Motor (see page 22) 1
13 M51105-01 Fan Guard 1
14 098219-38 Power Cord 1
15 M11143-1 Strain Relief Bushing 1
16 NTC-4C Hex Lock Nut, 1/4-20 2
17 M11084-26 Screw, #10-16 x 3/8" 4
18 M50631 Rubber Bumper 2
19 097461-09 Side Cover 1
20 101205-01 Motor Bracket 1
21 M30865-02 Bushing 2
22 M11271-8 Clip Nut 6
23 M50104-02 Bushing 1
24 M11084-26 Screw, #10-16 x 3/8" 6
25 097211-02 Screw, #8-18 x 1/2" 1
26 098511-234
27 M50814-06 Rubber Airline 1
28 079973-01 Fuel Line 1
29 M50876-05 Fuel Filter (with bushing) 1
30 M10990-3 Rubber Bushing 1
31 WLE-2 Lock Washer, #8 1
32 102349-01 PCB Support 5
33 104068-02 Ignition Control Assembly 1
34 097702-01 Fuel Cap (Includes Gasket) 1
35 108088-03 Fuel Tank 1
36 M51108-01 Shell Heat-Shield 1
37 104458-01 Thermostat 1
38 M12461-18 Screw, #8-32 x 7/8" 1
39 104460-01 Thermostat Knob 1
40 M15823-27 Screw, #10-16 x 1/2" 4
41 079532-01 Guard, Nose Cone 1
100621-09 Thermostat Decal 1
103814-01 Wire Tie 1
M9900-170 Wire Assembly 1
105550-01 Warning/Maintenance Decal 1
105550-02 Warning/Maintenance Decal 1
** Not available as an assembly
Upper Shell (Service Part Will Be Black)
Lower Shell (Service Part will be Black)
PARTS AVAILABLE - NOT SHOWN
1
1
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17111168-01A
ILLUSTRATED PARTS BREAKDOWN
MODELS AC-115, AND AC-165
2
1
3
7
5
4
6
23
24
28
40
41
20
22
21
30
14
31
11
8
19
25
18
29
37
9
10
12
15
26
26
27
39
38
13
7-4
7-1
7-6
7-2
7-3
7-5
16
41
47
35
33
36
32
14
17
44
45
42
43
46
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34
111168-01A18
PARTS LIST
MODELS AC-115, AND AC-165
KEY PART NUMBER
NO. 115 165 DESCRIPTION QTY.
1 098511-292 098511-292 Upper Shell (Service Part Will Be Black) 1
2 M15823-27 M15823-27 Screw, #10-16 x 1/2" 8
3 098512-71 098512-75 Combustion Chamber 1
4 103154-05 M16660-02 Photocell Bracket 1
5 M10908-2 M10908-2 Screw, #6-32 x 3/8" 2
6 M16656-24 M16656-24 Photocell Assembly 1
7 *** *** Burner Head Assembly 1
7-1 HA3027 HA3028 Nozzle Assembly 1
7-2 HA1000 HA1000 Ignitor Kit 1
7-3 M10908-75 M10908-75 Screw, Hex Head, Tapping 1
7-4 102336-01 102336-01 Nozzle Adapter Bracket 1
7-5 104054-01 104054-01 Nozzle Adapter 1
7-6 103347-01 103347-01 Belleville Washer 1
8 M11084-27 M11084-27 Screw, #10-16 x 1/2" 2
9 097293-01 102042-01 Fan 1
10 *** *** Motor (see page 22) 1
11 M50631 M50631 Rubber Bumper 2
12 101206-01 101206-01 Motor Mounting Bracket 1
13 WLE-2 WLE-2 Washer, #8 1
14 104068-02 104068-02 Igni ion Control Assembly 1
15 NTC-4C NTC-4C Hex Lock Nut, 1/4-20 2
16 111037-01 111037-01 Fan Guard 1
17 M27417 M27417 Drain Plug (Includes “o” Ring) 1
18 099213-01 099213-01 Button Plug 1
19 M51345-06 M51345-06 Fuel Line 1
20 106896-01** 106896-01** Fuel Filter 1
21 M51151-01 M51151-02 Fuel Line Tube 1
22 M10990-3 M10990-3 Rubber Bushing 1
23 M50814-03 M50814-03 Airline 1
24 098511-293 098511-293 Lower Shell (Service Part will be Black) 1
25 M50104-06 M50104-06 Bushing 1
26 M50104-01 M50104-01 Bushing 2
27 M11084-27 M11084-27 Screw, #10-16 x 1/2" 6
28 M11271-8 M11271-8 Clip Nut 8
29 M10908-14 M10908-14 Screw, #8-32 x 3/8" 1
30 108088-04 108088-05 Fuel Tank 1
31 097702-01 097702-01 Fuel Cap (Includes Gasket) 1
32 102349-01 102349-01 P.C. Board Support 5
33 M11143-1 M11143-1 Strain Relief Bushing 1
34 098219-38 098219-38 Power Cord 1
35 M51077-15 M51077-15 Side Cover 1
36 M11084-27 M11084-27 Screw, #10-16 x 1/2" 4
37 104458-01 104458-01 Thermostat 1
38 M12461-18 M12461-18 Screw, #8-32 x 7/8" 2
39 104460-01 104460-01 Thermostat Knob 1
40 079998-01 099614-01 Front Handle 1
41 M12345-33 M12345-33 Screw #10-24 x 1 3/4" 8
42 107426-01 107426-01 Wheels 2
43 M28526 M28526 Nut Cap 2
44 M12342-3 M12831-3 Wheel Support Frame 1
45 NTC-3C NTC-3C Hex Lock Nut, #10-24 6
46 M51015-01 M16801-2 Axle 1
_____
47
103814-01 103814-01 Wire Tie
HA1180 HA1180 Air Gauge Kit
HA2210 HA2210 Fuel Tank Filter Screen
HA3004 HA3004 Rotor Kit (M22456-1, M22009, M8643)
HA3017 HA3017 Filter Kit (M11637, M12179, M12244-1,106896-01)
HA3020 HA3020 Pump Kit (M27694, M10993-1, M22997,M8940)
100621-08 100621-08 Thermostat Decal 1
** See OPTIONAL ACCESSORIES *** Not available as an assembly.
099614-02 Rear Handle (If Equipped) 1
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19111168-01A
ILLUSTRATED PARTS BREAKDOWN
MOTOR AND PUMP ASSEMBLY MODEL AC-70
1
3
4
2
18
17
16
6
5
15
14
9
7
8
13
12
10
11
MODELS AC-115, AND AC-165
1
2
17
16
15
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3
4
5
6
7
8
9
13
14
13
12
10
11
111168-01A20
This list contains replaceable parts used in your heater. When ordering parts, be sure to provide the correct
PARTS LIST
model and serial numbers (from the model plate), then the part number and description of the desired part.
MODEL AC-70
KEY PART
NO. NUMBER DESCRIPTION QTY.
1 1
102001-20 Motor
2 079975-02 Pump Body 1
3 M22009* Insert 1
4 M22456-1* Rotor 1
5 M29608 Pump End Cover 1
6 M29632*** Lint Filter 1
7 M29633*** Intake Filter 1
8 M29609 Filter End Cover 1
9 M12461-31 Screw, #10-32 x 1" 3
10 M27694 ∞ Adjusting Screw 1
11 M10993-1 ∞ Pressure Relief Spring 1
12 M22997 ∞ Plug 1
13 M8940 ∞ Steel Ball, 1/4" Diameter 1
14 M29612-01*** Output Filter 1
15 M12461-31 Screw, #10-32 x 1" 6
16 103676-01 Nylon Elbow, 90° 1
17 M8643* Blade 4
18 FHPF3-5C Screw 2
* Included in Rotor Kit (Part No. HA3004)
*** Included in Filter Kit (Part No. HA3014)
MODELS AC-115, AND AC-165
KEY PART
NO. NUMBER DESCRIPTION QTY.
1 102001-30 Motor 1
2 079975-02 Pump Body 1
3 FHPF3-5C Screw, #10-32 x 5/8" 2
4 M22009** Rotor Insert 1
5 M22456-1** Pump Rotor 1
6 M50545 Pump End Cover 1
7 M12179** Intake Filter 1
8 M16545 Filter End Cover 1
9 M8940** Steel Ball, 1/4" Diameter 1
10 M10993-1** Relief Spring 1
11 M27694** Adjusting Screw 1
12 M22997** Plug 1
13 M12461-31 Screw, #10-32 x 1" 10
14 M12244-1** Output Filter 1
15 M11637** Lint Filter 1
16 M50820-02 Barb Fitting 1
17 M8643** Blade 4
** Included in Rotor Kit (Part No. HA3004)
∞ Included in Pump Adjustment Kit (Part No.
HA3020)
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21111168-01A
SPECIFICATIONS
Model Size 70T 115T 165T
Output Rating (Btu/Hr) 70,000 115,000 165,000
Fuel Use only kerosene, #1/#2 diesel/fuel oil, JET A or JP-8 fuels*
Fuel Tank Capacity
(U.S. Gal./Liters) 5/18.9 9/34 13.5/51
Fuel Consumption
(Gal. Per Hr/Liters Per Hr) .52/1.97 .85/3.00 1.2/4.54
Pump Pressure (psi) 4.7 5.1 5.6
Electric Requirements 120 V/60 HZ (Same All Models)
Amperage (Normal Run) 2.8 3.6 3.6
Motor RPM 3440 3440 3440
Hot Air Output (CFM) 360 490 575
Shipping Weight 35/15.9 54/24.5 65/29.5
(Approximate lbs./kg)
Heater Weight without Fuel 30/14 46/21 55/25
(Approximate lbs./kg)
* Use of #2 diesel & fuel oil will result in noticeable odor and could require additional fuel filter maintenance. Use in extreme cold temperatures may require nontoxic anti-icer additives.
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111168-01A22
ACCESSORIES
Heater accessories and parts are available at your
local dealer. Should your dealer not stock or is unable to order a particular accessory or part, please
contact DESA Industries for more information.
DESA Industries of Canada, Inc.
2220 Argentia Road, Unit #4
Mississauga, Ontario L5N 2K7
Parts Department
1-905-826-8010
AIR GAUGE KIT - HA1180
For all models. Special tool to check pump
pressure.
THERMOSTAT KIT - HA1210
Keeps your building at the temperature
you select day and night. Helps economize
on fuel.
IGNITION CONTROL ASSEMBLY/
PHOTOCELL TESTER - HA1170
Special tool used to test the ignition control assembly and photocell.
HEAVY DUTY WHEELS AND
HANDLE KIT - HA1202
For heavy duty applications. Makes your heater even more portable and convenient. Fits
70 model.
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23111168-01A
WARRANTY AND REPAIR SERVICE
KEEP THIS WARRANTY
Model No.
Serial No.
Date of Purchase
(To be filled in by purchaser)
LIMITED WARRANTY
DESA Industries warrants this product and any parts thereof, to be free from defects in materials and workmanship
for one (1) year from the date of first purchase when operated and maintained in accordance with instructions. This
warranty is extended only to the original retail purchaser, when proof of purchase is provided.
This warranty covers only the cost of parts and labor required to restore the product to proper operating condition.
Transportation and incidental costs associated with warranty repairs are not reimbursable under this warranty.
Warranty service is available only through authorized dealers and service centers.
This warranty does not cover defects resulting from misuse, abuse, negligence, accidents, lack of proper maintenance, normal wear, alteration, modification, tampering, contaminated fuels, repair using improper parts, or
repair by anyone other than an authorized dealer or service center. Routine maintenance is the responsibility of
the owner.
THIS EXPRESS WARRANTY IS GIVEN IN LIEU OF ANY OTHER WARRANTY EITHER EXPRESSED
OR IMPLIED, INCLUDING WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE.
DESA Industries assumes no responsibility for indirect, incidental or consequential damages. Some states do
not allow the exclusion or limitation of incidental or consequential damages or limitations or exclusions may not
apply to you. This Limited Warranty gives you specific legal rights and you may also have other rights which
vary from province to province.
WARRANTY SERVICE
Should your heater require service, return it to your nearest authorized service center. Proof of purchase must be
presented with the heater. The heater will be inspected. A defect may be caused by faulty materials or workmanship.
If so, DESA Industries will repair or replace the heater without charge.
REPAIR SERVICE
Return the heater to your nearest authorized service center. Each Service Center is independently owned and operated.
Repairs not covered by the warranty will be billed at standard prices. We reserve the right to amend these specifications
at any time without notice.
Illustrated parts lists can be obtained free of charge. Send a self-addressed stamped envelope to the address listed
below. List the heater model number and the date located in the lower right corner of this page. A service manual may
be purchased from the address listed below. Send a cheque for $5.00 payable to DESA Industries.
When writing for information regarding your heater, be sure to include the model number and serial number as shown
on the model plate.
Printed in USA
1083 Pine Ridge Rd
Martin, MI 49070
1-800-475-5660
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