John Deere AC-115, AC-165, AC-70 OPERATOR’S MANUAL

AC-70, AC-115
AND AC-165
SPACE HEATERS

Introduction

THANK YOU for purchasing a John Deere product.

READ THIS MANUAL carefully to learn how to operate
and service your machine correctly. Failure to do so
could result in personal injury or equipment damage.
This manual and safety signs on your machine may
also be available in other languages. (See your John
Deere dealer to order.)

THIS MANUAL SHOULD BE CONSIDERED a
permanent part of your machine and should remain
with the machine when you sell it.

MEASUREMENTS in this manual are given in both
metric and customary U.S. unit equivalents. Use only
correct replacement parts and fasteners. Metric and
inch fasteners may require a specific metric or inch
wrench.

RIGHT HAND AND LEFT HAND sides are determined
by facing the motor end of the machine.

The SERIAL NUMBER is located in the Specification
or Identification Numbers section. Accurately record
all the numbers to help in tracing the machine should
it be stolen. Your dealer also needs these numbers
when you order parts. File the identification numbers
in a secure place off the machine.

WARRANTY is provided from your John Deere
dealer for customers who operate and maintain their
equipment as described in this manual. The warranty
is explained on the warranty certificate shown in this
manual.

This warranty provides you the assurance that your
dealer will back products where defects appear
within the warranty period. Should the equipment
be abused, or modified to change its performance
beyond the original factory specifications, the warranty
will become void.

2 Operator’s Manual

Contents

Page

Safety ........................................................................ 4

Controls ................................................................. 10

Assembly .................................................................. 11

Preparation ............................................................... 12

Operation ................................................................ 14

Troubleshooting .....................................................

Service .................................................................... 18

Storage .................................................................... 25

Specifications ......................................................... 26

Warranty ..................................................................27

Notes ........................................................................ 28

16

All information, illustrations and specifications in this manual are based on the latest

information available at the time of publication. The right is reserved to make changes at any

time without notice.

Operator’s Manual 3

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Safety

RECOGNIZE SAFETY INFORMATION

This is the safety alert symbol. When you see this
symbol on your machine or in this manual, be alert to
the potential for personal injury.

Follow recommended precautions and safe operating
practices.

UNDERSTAND SIGNAL WORDS

A signal word--DANGER, WARNING or CAUTION--is
used with the safety-alert symbol. DANGER identifies
the most serious hazards.

DANGER or WARNING safety signs are located near
specific hazards. General precautions are listed on
CAUTION safety signs. CAUTION also calls attention
to safety messages in this manual.

FOLLOW SAFETY INSTRUCTIONS

Carefully read all safety messages in this manual and on
your machine safety signs. Keep safety signs in good
condition. Replace missing or damaged safety signs.
Be sure new equipment components and repair parts
include the current safety signs. Replacement safety
signs are available from your John Deere dealer.

Read this owner’s manual carefully and completely before
trying to assemble, operate, or service this space heater.
Improper use of this space heater can cause serious injury
or death from burns, fire, explosion, electrical shock, and
carbon monoxide poisoning.

Make certain you read and understand all warnings.
Keep this manual for reference. It is your guide to safe
and proper operation of this space heater.

If you do no understand any part of this manual and need
assistance, contact your John Deere dealer.

4 Operator’s Manual

CARBON MONOXIDE - POISONOUS GAS

DANGER: CARBON MONOXIDE POISONING MAY LEAD TO
DEATH!

Space heaters exhaust contains carbon monoxide - a poisonous gas
that can kill you. You CAN NOT smell or see this gas.

Carbon Monoxide Poisoning: Early signs of carbon monoxide poisoning
resemble the flu, with headaches, dizziness, and/or nausea. If you have
these signs, the space heater may not be working properly. Get fresh air at
once! Have space heater serviced. Some people are more affected by carbon
monoxide than others. These include pregnant women, persons with heart
or lung disease or anemia, those under the influence of alcohol, and those
at high altitudes.

Never use a space heater in enclosed or partially-enclosed spaces without
proper ventilation. Use only in well-vented areas. Before using space heater,
provide at least a three-square-foot (2800 square cm) opening of fresh,
outside air for each 100,000 Btu / Hr (30 kw) of rating. Space heaters can
produce high levels of carbon monoxide very quickly. When you use a space
heater, remember that you cannot smell or see carbon monoxide. Even if you
can’t smell exhaust fumes, you may still be exposed to carbon monoxide.

If you start to feel sick, dizzy, or weak while using a space heater, get to fresh
air RIGHT AWAY. DO NOT DELAY. The carbon monoxide from space heaters
can rapidly lead to full incapacitation and death.

If you experience serious symptoms, get medical attention immediately.
Inform medical staff that carbon monoxide poisoning is suspected. If you
experienced symptoms while indoors, have someone call the fire department
to determine when it is safe to re-enter the building.

NEVER operate the space heater in an explosive atmosphere, near
combustible materials or where ventilation is not sufficient to carry away
exhaust fumes. Exhaust fumes can cause serious injury or death.

Follow the instructions that come with your space heater. Locate the unit
outdoors and away from doors, windows, and vents that could allow the
carbon monoxide gas to come indoors.

NEVER run space heaters inside homes, garages, sheds, or other semi­enclosed spaces without proper ventilation. These spaces can trap poisonous
gases EVEN IF you run a fan or open doors and windows. Use only in well­vented areas. Before using space heater, provide at least a three-square-foot
(2800 square cm) opening of fresh, outside air for each 100,000 Btu / Hr (30
kw) of rating.

If you start to feel sick, dizzy, or weak while using the space heater, shut
if off and get fresh air RIGHT AWAY. See a doctor. You may have carbon
monoxide poisoning.

Install battery-operated carbon monoxide alarms or plug-in carbon monoxide
alarms with battery back-up in your home, according to the manufacturer’s
installation instructions. The carbon monoxide alarms should be certified to
the requirements of the latest safety standards for carbon monoxide alarms.
(UL 2034, IAS 6-96, or CSA 6.19.01).

Test your carbon monoxide alarm frequently and replace dead batteries.

Operator’s Manual 5

SAFETY WARNING WHEN REFUELING

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.

Personnel involved with fueling shall be qualified and thoroughly
familiar with the manufacturer’s instructions and applicable
regulations regarding the safe fueling of heating units.

Only the type of fuel specified on the space heater’s data plate
shall be used.

All flame, including the pilot light, if any, shall be extinguished and
the space heater allowed to cool, prior to fueling.

During fueling, all fuel lines and fuel-line connections shall be
inspected for leaks. Any leaks shall be repaired prior to returning
the space heater to service.

At no time shall more than one day’s supply of space heater fuel
be stored inside a building in the vicinity of the space heater. Bulk
fuel storage shall be outside the structure.

All fuel storage shall be located a minimum of 25 feet (762cm) from
space heaters, torches, welding equipment, and similar sources
of ignition (exception: the fuel reservoir integral with the space
heater unit).

Whenever possible, fuel storage shall be confined to areas where
floor penetrations do not permit fuel to drip onto or be ignited by
a fire at lower elevation.

Fuel storage shall be in accordance with the authority having
jurisdiction.

Observe all safety regulations for the safe handling of fuel.
Handle fuel in safety containers. If the container does not have a
spout, use a funnel.

Do not overfill the fuel tank, leave room for the fuel to expand.

Do not refill fuel tank while the engine is running. Before
refueling the space heater, turn it off and let it cool down.

Fill the tank only on an area of bare ground. While fueling the
tank, keep heat, sparks and open flame away. Carefully clean
up any spilled fuel before starting engine.

Always fill fuel tank in an area with plenty of ventilation to avoid
inhaling dangerous fumes.

NEVER store fuel for your space heater in the home. Gasoline,
propane, kerosene, and other flammable liquids should be stored
outside of living areas in properly-labeled, non-glass safety
containers. Do not store them near a fuel-burning appliance, such
as a natural gas water heater in a garage. If the fuel is spilled or
the container is not sealed properly, invisible vapors from the fuel
can travel along the ground and can be ignited by the appliance’s
pilot light or by arcs from electric switches in the appliance.

6 Operator’s Manual

ELECTRICAL HAZARDS

DANGER- IMPROPER CONNECTION OF THE
EQUIPMENT-GROUNDING CONDUCTOR CAN
RESULT IN A RISK OF ELECTROCUTION. CHECK
WITH A QUALIFIED ELECTRICIAN OR SERVICE
PERSON IF YOU ARE IN DOUBT AS TO WHETHER

THE UNIT IS PROPERLY GROUNDED.

Use only the electrical voltage and frequency specified on
model plate.

Space heater must be grounded. Use only a properly
grounded three-wire extension cord. Plug into grounded
outlet only. If it should malfunction or breakdown, grounding

provides a path of least resistance for electric current to
reduce the risk of electric shock.

The space heater is a potential source of electrical shock if
not kept dry. Keep the space heater dry and do not use in
rain or wet conditions. To protect from moisture, operate it
on a dry surface under an open, canopy-like structure. Dry
your hands if wet before touching the space heater.

Check that the entire cord is free of cuts or tears and that
the plug has all three prongs, especially a grounding pin.

Operator’s Manual 7

IMPORTANT SAFETY INSTRUCTIONS

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1. Use only in areas free of flammable vapors or high dust
content.

2. Minimum clearance from any combustible materials: 8
feet (244 cm) from hot air outlet; 4 feet (122 cm) from
top; and 4 feet (122 cm) from sides and inlet.

3. Locate space heater on a stable and level surface while
hot or operating or a fire may occur.

4. Use only in well-vented areas. Before using space
heater, provide at least a three-square-foot (2800 square
cm) opening of fresh, outside air for each 100,000 Btu
/ Hr (30 kw) of rating.

5. Keep children and animals away from space heater at
all times.

6. Never start space heater when combustion chamber is
hot or if fuel has accumulated in combustion chamber.

7. When used with thermostat, space heater may start at
anytime.

8. When space heater is moved or stored, it must be in a
level position or fuel spillage may occur.

9. Use space heater only in accordance with local
ordinances and codes.

10. Never use gasoline, crankcase drainings, naphtha,
paint thinners, alcohol, or other highly flammable
fuels.

11. Never use space heater where gasoline, paint thinner, or
other highly flammable vapors are present.

12. Never use space heater in living or sleeping areas.

13. Never leave a space heater plugged in without adult
supervision if children or animals are likely to be
present.

14. Never move, handle, refuel, or service a hot,
operating, or plugged-in space heater.

15. Never attach duct work to front or rear of space
heater.

16. Never attach space heater to external fuel tank.

17. Space heaters used in the vicinity of tarpaulins, canvas,
or similar enclosure materials shall be located a
safe distance from such materials. The recommended
minimum safe distance is 10 feet (304.8cm). It is
further recommended that these enclosure materials
be of a fire retardant nature. These enclosure
materials shall be securely fastened to prevent them
from igniting or from upsetting the space heater due to
wind action.

18. Unplug space heater when not in use.

19. Never block air inlet (rear) or air outlet (front) of
space heater.

SAVE THESE INSTRUCTIONS

8 Operator’s Manual

WEAR PROTECTIVE CLOTHING

Wear close fitting clothing and safety equipment appropriate
to the job.

Wear a suitable hearing protective device such as
earmuffs or earplugs to protect against objectionable or
uncomfortable loud noises.

Operating equipment safely requires the full attention of
the operator. Do not wear radio or music headphones while
operating machine.

PREPARE FOR EMERGENCIES

Keep a first aid kit and fire extinguisher handy.
Keep emergency numbers for doctors, ambulance service,

hospital and fire department near your telephone.
Be prepared if a fire starts.

INSPECT SPACE HEATER

Be sure all covers, guards and shields are tight and in
place.

Locate all operating controls and safety labels.
Inspect power cord for damage before using. There is a
hazard of electrical shock from crushing, cutting or heat
damage.

Remove all packing items applied to space heater for
shipment. Remove all items from carton. Check items for

any shipping damage. If space heater is damaged, promptly
inform dealer where you bought space heater.

SERVICE SPACE HEATER SAFELY

Before servicing the space heater, disconnect all equipment
and battery (if equipped) and allow unit to cool down.

Service space heater in a clean dry flat area.

Operator’s Manual 9

CONTROLS

A

B

C

D

E

F

G

H

I

A

B

C

D

E

F

G

H

A

B

C

D

E

F

G

H

Controls

AC-70

A -- Hot Air Outlet
B -- Thermostat Knob
C -- Fan Guard

AC-165

D -- ON / OFF Switch
w/ Light
E -- Ignition Control Assembly
(On Inside of Side Cover)
F -- Side Cover

AC-115

G -- Fuel Cap / Gauge
H -- Fuel Tank
I -- Air Filter End Cover

10 Operator’s Manual

Assembly

Wheel Support
Frame

Fuel
Tank
Flange

Cap Nut

Wheel

Nut

Axle

Extended
Hub

Air
Inlet

Handle

Hot Air
Outlet

Screw

Wheel Spacer
(If Provided)

Cord Cleat with
Bolts and Nuts

Handle

ASSEMBLY

NOTE: For 115 and 165 Models Only

These models are furnished with wheels and a handle.
Some models are furnished with a second handle also.
Wheels, handle(s), and the mounting hardware are 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 wheel spacers
if provided. Install wheels on axle.

IMPORTANT: When installing wheels, point extended

hub of wheels toward wheel support frame (Fig. 1).

2. Place cap nuts on axle ends. Gently tap with hammer
to secure.

3. Place space heater on wheel support frame. Line up
holes on fuel tank flange with holes on wheel support
frame.

4. Place handle(s) on top of fuel tank flange. Insert
screws through handle(s), fuel tank flange, and wheel
support frame. Attach nut, hand tight after each screw
is inserted.

5. After all screws are inserted, tighten nuts firmly.

(Fig. 1)

Operator’s Manual 11

Preparation

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
SPACE HEATERS ARE BEING USED. THE MINIMUM
VENTILATION REQUIREMENTS MUST BE
FOLLOWED TO AVOID RISKS ASSOCIATED WITH
CARBON MONOXID E POISON I NG. MAK E
CERTAIN THESE REQUIREMENTS ARE MET
PRIOR TO OPERATING SPACE HEATER.

Example: A 200,000 Btu / Hr (58.6kw) space heater
requires one of the following:

• a two-car garage door [16 feet (4.88 meter) opening]
raised 5 inches (12.7 cm)

• a single-car garage door [9 feet (2.74 meter) opening]
raised 8 inches (20.3 cm)

• two, 30 inch (76.2 cm) windows raised 15 inches

(38.1 cm)

FUELS

WARNING: USE ONLY KEROSENE, #1/#2 DIESEL/
FUEL OIL, JET A OR JP8 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

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 space 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 space heater.
Foreign matter may also require space heater’s fuel system
to be frequently cleaned.

12 Operator’s Manual

Preparation

Clean
Heated
Air Out

Fuel
Filter

Air Line
To Burner

Air Output Filter

Air Pump

Air Intake Filter

Cool Air In

Fan

Combustion
Chamber

Ignitor

Ignition Control

Assembly
Air For Fuel
System

Air For
Combustion
And Heating

Fuel

Nozzle

Fuel
Tank

Motor

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: The motor turns the fan. The fan pushes air into and around the combustion chamber. This air
is heated and provides a stream of clean, hot air.

The Ignition System: The ignition control assembly provides power to the ignitor. This ignites the fuel / air mixture
in the combustion chamber.

The Flame-Out Control System: This system causes the space heater to shut down if the flame goes out.

Operator’s Manual 13

Operation

ON/OFF
Switch with
Light

ON/OFF
Switch with
Light

OPERATION

IMPORTANT: Review and understand the warnings in
the Safety Information section. They are needed to safely
operate this space heater. Follow all local ordinances and
codes when using this space heater.

START SPACE HEATER:

1.

Follow all ventilation and safety information.

2. Place the space heater in an area that provides
maximum circulation of the heated air. Follow all location
requirements noted in the Safety Information.

3. Fill fuel tank with kerosene, #1#2 diesel / fuel oil, JET A
or JP-8 fuel.

4. Attach fuel cap.

5. For thermostat models, turn thermostat knob clockwise
to the high position.

6.

Plug space heater’s power cord into approved, grounded,
three-wire extension cord. Extension cord must be at least
six feet (1.8 meters) long.

Extension Cord Size Requirement:

2

• 6 to 10 feet (1.8 to 3 meters) long, use 18 AWG (0.75 mm
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

7.

Plug extension cord into standard 120 volt / 60 hertz, 3­prong grounded outlet. Push ON / OFF switch to ON(|)
position and space heater should start in 5 seconds.
(Fig. 2) If space heater does not start, see
Troubleshooting.

8. Adjust thermostat knob to the desired setting.

Note: A cold space heater may affect the thermostat

setting. This thermostat is a general-heating control.
It is not intended for precise temperature control.
Adjust thermostat until space heater cycles at the
desired setting.

STOP SPACE HEATER:
Push ON / OFF switch to OFF (O) position. Unplug space
heater when not in use.

)

Model: AC-70

Models: AC-115 / 165

(Fig. 2)

14 Operator’s Manual

OPERATION (CONTINUED)

Ground Lug

Ground Wire (#10
AWG - Stranded­Copper)

Alternator

Copper
or Brass
Grounding
Point

OPERATION WITH PORTABLE SPACE HEATER:

Operation

WAR NING : BE FO RE OPE R ATIN G SPA CE
HEATER OR ANY APPLIANCE FROM A
PORTABLE SPACE HEATER, VERIFY THAT
SPACE HEATER HAS BEEN PROPERLY
CONNECTED TO THE GROUND (FIG. 3).
IMPROPER GROUNDING OR FAILURE TO
GROUND SPACE HEATER CAN RESULT IN
E LE C TR OC U T IO N I F A G RO UN D
FAULT OCCURS. REFER TO OWNER’S
MANUAL SUPPLIED BY SPACE HEATER
MANUFACTURER FOR PROPER GROUNDING
PROCEDURES.

The operating voltage range of the space heater is 108
to 132 Volts (120 Volts +/- 10%). Prior to plugging space
heater into space heater the output voltage should be
verified (if space heater is equipped with the automatic idle
feature, the output voltage should be measured with the
space heater running at full speed). If the voltage does
not measure in this range the space heater should not be
plugged into the space heater.

Refer to Operation, for starting, stopping, and resetting
space heater procedures.

(Fig. 3)

Operator’s Manual 15

Troubleshooting

WARNING: HIGH VOLTAGE. NEVER SERVICE SPACE HEATER WHILE IT IS PLUGGED IN,
OPERATING, OR HOT. SEVERE BURNS AND ELECTRICAL SHOCK CAN OCCUR.

Symptom Problem Solution

Motor does not start five
seconds after space heater is
plugged in.

No power to space heater.

ON / OFF switch not in the ON(|)
position.

Thermostat setting is too low.

Bad electrical connection between
motor and ignition control
assembly or ignition control
assembly and power cord.

Binding pump rotor.

Defective ignition control
assembly.

Defective motor.
Blown fuse or ignitor control

assembly.

Check circuit breaker in electrical
panel.

Verify the ON / OFF switch is in
ON (|) position and light is on.

Turn thermostat knob to a higher
setting.

Check all electrical connections.

If fan does not turn freely, see
"Maintenance: Pump Rotor".

Replace ignition control
assembly.

Replace motor.
See "Maintenance: Ignition

Control Assembly".

16 Operator’s Manual

Troubleshooting

WARNING: HIGH VOLTAGE. NEVER SERVICE SPACE HEATER WHILE IT IS PLUGGED IN,
OPERATING, OR HOT. SEVERE BURNS AND ELECTRICAL SHOCK CAN OC

CUR.

Symptom Problem Solution
Motor starts and runs but

space heater does not
ignite

Space heater ignites but
ignition control assembly
shuts space heater off after
a short period of time.

No fuel in tank.

Pump pressure incorrect.

Dirty fuel filter.

Obstruction in nozzle.

Water in fuel tank.

Bad electrical connection
between ignitor and ignition
control assembly.

Defective ignitor.

Defective ignition control
assembly.

Pump pressure incorrect.

Dirty air intake, air output, and/or
lint filter.

Dirty fuel filter.

Obstruction in nozzle.

Photocell assembly not properly
installed (not seeing the flame).

Dirty photocell lens.

Bad electrical connection
between photocell and ignition
control assembly.

Defective photocell.

Defective ignition control
assembly.

Fill tank with kerosene.

See "Maintenance: Pump
Pressure Adjustment".

See "Maintenance: Fuel Filter".

See

"Maintenance:

Nozzle

Assembly".

Drain and flush fuel tank with
clean kerosene.

Check electrical connections.

Replace ignitor, see
"Maintenance: Ignitor".

Replace ignition control
assembly.

See "Maintenance: Pump
Pressure Adjustment".

See "Maintenance: Air Output,
Air Intake, and Lint Filters".

See "Maintenance: Fuel Filter".

See

"Maintenance:

Nozzle

Assembly".

Make sure photocell boot is
properly seated in bracket.

Clean photocell lens.

Check electrical connections.

Replace photocell.

Replace ignition control
assembly.

Operator’s Manual 17

Service

MAINTENANCE

PREVENTATIVE MAINTENANCE SCHEDULE:

WARNING: HIGH VOLTAGE. NEVER SERVICE Space heater WHILE IT IS PLUGGED IN, OPERATING,
OR HOT. SEVERE BURNS AND ELECTRICAL SHOCK CAN OCCUR.

Item How Often How to
Fuel tank

Air output and lint
filters

Air intake filter

Fuel filter

Ignitor

Fan blades

Motor

Flush every 150-200 hours of
operation or as needed.

Replace every 500 hours of
operation or once a year.

Wash and dry with soap and
water every 500 hours of opera­tion or as needed.

Clean twice a heating season or
as needed.

No maintenance required.

Clean every season or as
needed.

Not required / permanently
lubricated.

See "Storage: Storing,
Transporting, or Shipping".

See "Maintenance: Air Output,
Air Intake, and Lint Filters".

See "Maintenance: Air Output,
Air Intake, and Lint Filters".

See "Maintenance: Fuel Filter".

See "Maintenance: Fan".

18 Operator’s Manual

Service

Upper Shell

Fan Guard

Screw

Fan
Guard

Upper Shell

Screw

Motor Shaft

Setscrew

Fan

Motor
Shaft

Fan

Setscrew

Flush

Motor

MAINTENANCE (CONTINUED):

WARNING: TO AVOID RISK OF BURN AND
ELECTRICAL SHOCK, NEVER ATTEMPT
TO SERVICE SPACE HEATER WHILE IT IS
PLUGGED IN, OPERATING, OR HOT.

UPPER SHELL REMOVAL:

1. Remove screws along each side of space heater using
5/16" nut-driver. These screws attach upper and lower
shells together. (Fig. 4 or 5)

2. Lift upper shell off.

3. Remove fan guard.

FAN:

IMPORTANT: Remove fan from motor shaft before
removing motor from space heater. The weight of the
motor resting on the fan could damage the fan pitch.
(Fig. 6)

Model: AC-70

(Fig. 4)

1. Remove upper shell. (Fig. 4 or 5)

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. (Fig. 7)

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.

Models: AC-115 / 165

(Fig. 5)

(Fig. 6)

Operator’s Manual 19

(Fig. 7)

Service

Air Intake Filter

Lint Filter

Filter End
Cover

Air Output Filter

Air Intake Filter

Filter
End
Cover

Lint Filter

Air Output Filter

Pressure
Gauge

Plug

Relief
Valve

Pressure
Gauge

MAINTENANCE (CONTINUED):

AIR OUTPUT, AIR INTAKE AND LINT FILTERS:

1. Remove upper shell. (Fig. 4 or 5)

2.

Remove filter end cover screws using 5/16" nut-driver.
(Fig. 8 or 9)

3. Remove filter end cover.

4. Replace air output and lint filters.

5. Wash or replace air intake filter (see "Preventative
Maintenance Schedule").

6. Replace filter end cover.

7. Replace fan guard and upper shell.

IMPORTANT: Do not oil filters.

PUMP PRESSURE ADJUSTMENT:

1. Remove pressure gauge plug from filter end cover
(Fig. 10).

2. Install a pressure gauge.

3. Start space heater (See "Operation"). 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
(Fig. 11). See specifications below for correct pressure
for each model.

Model: Pump Pressure:
70 4.7 PSI
115 5.1 PSI
165 5.6 PSI

Model: AC-70

(Fig. 8)

Models: AC-115 / 165

(Fig. 9)

5. Remove pressure gauge. Replace pressure gauge plug

20 Operator’s Manual

in filter end cover.

Model: AC-70 Shown

(Fig. 10)

Model: AC-70 Shown

(Fig. 11)

MAINTENANCE (CONTINUED):

Fuel Filter and
Bushing

Side Cover

Upper Fuel Line

Fuel Filter, Bushing,
and Lower Fuel Line

Upper Fuel Line

Side
Cover

FUEL FILTER:

1. Remove side cover screws using 5/16" nut-driver.

2. Remove side cover.

3. Pull upper fuel line off fuel filter neck (Fig. 12 or 13).

4. Carefully pry bushing, fuel filter, and lower fuel line
(AC-115/165 models only) out of fuel tank (Fig. 13).

5.

Wash fuel filter with clean fuel and replace in tank.

6. Attach upper fuel line to fuel filter neck.

7. Replace side cover.

Service

Model: AC-70

(Fig. 12)

Models: AC-115 / 165

(Fig. 13)

Operator’s Manual 21

Service

Fuel Line Hose

Air Line
Hose

Nozzle/
Adapter
Assembly

Combustion
Chamber

Photocell
Bracket

Nozzle
Adapter
Bracket

Nozzle/
Adapter
Assembly

Combustion
Chamber

Air Line
Hose

Nozzle
Adapter
Bracket

Fuel
Line
Hose

Photocell
Bracket

Photocell
Bracket

Air Line
Hose

Fuel
Line
Hose

Combustion
Chamber

Photocell
Assembly

Ignitor

Nozzle
Adapter
Bracket

Ignition
Control
Assembly

Side Cover

Ignitor
Wire

Photocell
Bracket

Ignitor

Ignitor Screw/
Washer Assembly

Nozzle
Adapter
Bracket

Ignitor
Element

Combustion
Chamber

Nozzle Adapter
Bracket Opening

MAINTENANCE (CONTINUED):

IGNITOR:

1. Remove upper shell and fan guard (See "Maintenance:
Upper Shell Removal").

2. Remove fan.

3. Remove 4 side cover screws with a 5/16" nut driver.
Remove side cover (Fig. 12 or 13).

4. Disconnect ignitor wires from ignition control assembly
(Fig. 14). 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 (Fig. 14).

6. Remove combustion chamber. Stand combustion
chamber on end with nozzle adapter bracket on top (Fig.

15).

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.

(Fig. 14)

8. Carefully remove replacement ignitor from 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
(Fig. 16). Torque .90 to 1.69 N-m (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 (Fig. 15).

12. Replace side cover (Fig. 13 or 14).

13. Connect and route fuel line hose and air line hose
to nozzle adapter assembly. See "Maintenance: Fuel
and Air Line Replacement and Proper Routing".

14. Replace photocell in photocell bracket. Route wires
as shown in either Fig. 16 or Fig. 17.

15. Replace fan.

16. Replace fan guard and upper shell.

22 Operator’s Manual

(Fig. 15)

Model: AC-70

(Fig. 16)

Models: AC-115 / 165

(Fig. 17)

Service

Nozzle/
Adapter
Assembly

Combustion
Chamber

Nozzle Face

Nozzle

Nozzle Sleeve

Nozzle Adapter

Air Line
Fitting

Fuel Line Fitting

Air Hose

Pump End Cover

Barb
Fitting

115/165 Models70 Models

Barb Fitting

MAINTENANCE (CONTINUED):

NOZZLE ASSEMBLY:

1. Remove upper shell (See "Maintenance: Upper Shell
Removal")

2. Remove fan (See "Maintenance: Fan").

3.

Remove fuel and air line hoses from nozzle assembly
(Fig. 16 or Fig. 17).

4. Turn nozzle assembly 1/4 turn to left and pull toward motor
to remove (Fig. 18).

5. Place plastic hex-body into vise and lightly tighten.

6. Carefully remove nozzle from the nozzle adapter using 5/8"
socket wrench (Fig. 19).

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 4.5 to 5.1 N-m (40 to
45 in-lbs). See Fig. 19.

10. Attach nozzle assembly to burner strap (Fig. 18).

11. Attach fuel and airline hoses to nozzle assembly.
See "Maintenance: Fuel and Air Line Replacement
and Proper Routing".

12. Replace fan (See "Maintenance: Fan").

13. Replace fan guard and upper shell (See "Maintenance:
Upper Shell Removal").

(Fig. 18)

(Fig. 19)

FUEL AND AIR LINE REPLACEMENT AND PROPER
ROUTING:

1. Remove upper shell (See "Maintenance: Upper Shell
Removal").

(Fig. 20)

2. Remove side cover screws using 5/16" nut driver (Fig. 12
or 13).

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 (Fig.
16 or 17) and from fuel filter (See "Maintenance:Fuel Filter").
If air line hose is damaged, disconnect from nozzle adapter
(Fig. 16 or 17) and from barb fitting on pump end cover (Fig.

20).

5. Install new air and/or fuel line. Attach one end of air line hose
to barb fitting on pump end cover (Fig. 20) and the other end
to nozzle adapter (Fig. 16 or 17). Attach one end of fuel line
hose to fuel filter (see "Maintenance: Fuel Filter") and the
other end to nozzle adapter (Fig. 16 or 17).

Note: Route hoses as shown in see Fig. 16 or 17, according to
model. Hoses are not to touch photocell bracket.

6. Replace side cover.

7. Replace upper shell and fan guard (See "Maintenance: Upper
Shell Removal").

Operator’s Manual 23

MAINTENANCE (CONTINUED):

Pump
Plate

Insert

Rotor

Blade

Filter
End
Cover

Air Intake
Filter

Air Output Filter

Insert

Blade

Rotor

Pump Plate

Air
Intake
Filter

Air Output Filter

Filter End Cover

Gap Adjusting Screw

Rotor

Blade

.003”/.004”
(.076-.101 mm)
Gap Measured
With Feeler
Gauge

Gap Adjusting Screw

Sandpaper

Fuse Clips

Fuse

Fuse
Cover

Service

PUMP ROTOR: (

1. Remove upper shell (See

Procedure if Rotor is Binding)

"Maintenance: Upper Shell

Removal").

2. Remove filter end cover screws using 5/16" nut driver
(Fig. 21 or 22).

3. Remove filter end cover and air filters.

4. Remove pump plate screws using 5/16" nut-driver.

5. Remove pump plate.

6. Remove rotor, insert, and blades (Fig. 21 or 22).

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 .076/.101 mm (.003”/.004”)
if needed (Fig. 23).

Note: Rotate rotor one full turn to ensure the gap is

.076/.101 mm (.003"/.004") 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 "Maintenance:
Upper Shell Removal").

12. Adjust pump pressure (see "Maintenance:Pump
Pressure Adjustment").

Model: AC-70

(Fig. 21)

Models: AC-115 / 165

(Fig. 22)

Note: If rotor is still binding, proceed as follows.

13. Perform steps 1 through 6.

14. Place fine grade sandpaper (600 grit) on flat surface.
Sand rotor lightly in a “figure 8” motion four times (Fig.

24).

15. Reinstall insert and rotor.

16. Perform steps 10 through 12.

IGNITION CONTROL ASSEMBLY:

WARNING: HIGH VOLTAGE!

1. Unplug space heater.

2. Remove side cover screws (4) using 5/16" nut-driver
to expose ignition control assembly.

3. Remove fuse cover (Fig. 25).

4.

Remove fuse from fuse clips (see Fig. 25).

5. Replace fuse with fuse of the same type and rating
(GMA-10). Do not substitute a fuse with a higher current
rating.

6. Replace fuse cover (Fig. 25).

7. Replace side cover.

24 Operator’s Manual

(Fig. 23)

(Fig. 24)

(Fig. 25)

Storage

STORAGE

STORING, TRANSPORTING OR SHIPPING:

Note: If shipping, transport companies require fuel tanks
to be empty.

1. Drain fuel tank.

Note: Some models have drain plug on underside of fuel
tank. If so, remove drain plug to drain all fuel. If
space heater does not have drain plug, drain fuel
through fuel cap opening. Be sure all fuel is
removed.

2. Replace drain plug if provided.

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 space heater in dry place. Make sure
storage place is free of dust and corrosive fumes.

IMPORTANT: Do not store kerosene over summer
months for use during next heating season. Using old
fuel could damage space heater.

Operator’s Manual 25

Specifications

ITEM SPECIFICATION

Model Size 70 115 165

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 120V / 60 HZ 120V / 60 HZ 120V / 60 HZ

Amperage (Normal Run) 2.8 3.6 3.6

Motor RPM 3440 3400 3400

Hot Air Output (CFM) 360 490 575

Motor HP 1/8 1/5 1/5

Shipping Weight
(Approximate Pounds /
Kilograms) 36 / 16.3 56 / 25.4 71 / 32.2

Space heater Weight without Fuel
(Approximate Pounds /
Kilograms) 32 / 14.5 48 / 21.8 61 / 27.7

* 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.

RECORD SERIAL NUMBER

Write you model number, machine serial number and
date of purchase in the spaces provided below. Your
dealer needs this information when ordering parts.

Model No. ______________________________________________

Machine Serial No. _______________________________________

Date of Purchase ________________________________________
(To be filled in by purchaser)

26 Operator’s Manual