Desa Tech A375LP, AC-375LP Owner's Manual

AC-375LP
SPACE HEATER

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.

GENERAL HAZARD WARNING:
FAILURE TO COMPLY WITH THE PRECAUTIONS
AND INSTRUCTIONS PROVIDED WITH THIS
HEATER, CAN RESULT IN DEATH, SERIOUS
BODILY INJU RY AND PROPERTY LOSS
OR DAMAGE FROM HAZARDS OF FIRE,
EXPOSITION, BURN, ASPHYXIATION, AND/OR
CARBON MONOXIDE POISONING.

ONLY PERSONS WHO CAN UNDERSTAND AND
FOLLOW THE INSTRUCTIONS SHOULD USE
OR SERVICE THIS HEATER.
IF YOU NEED ASSISTANCE OR HEATER
INFORMATION SUCH AS AN INSTRUCTIONS
MANUAL, LABELS, ETC. CONTACT THE
MANUFACTURER.

WARNING: FIRE, BURN, INHALATION
AND EXPLOSION HAZARD. KEEP SOLID
COM BUS T IBL E S, SUC H AS BUI LDIN G
MATERIALS, PAPER OR CARDBOARD, A
SAFE DISTANCE AWAY FROM THE HEATER
AS RECOMMENDED BY THE INSTRUCTIONS
NEVER USE THE HEATER IN SPACES WHICH
DO OR MAY CONTAIN VOLATILE OR AIRBORNE
COMBUSTIBLES OR PRODUCTS SUCH AS
GASOLINE, SOLVENTS, PAINT THINNER, DUST
PARTICLES OR UNKNOWN CHEMICALS.

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.

The heater is designed for use as a construction heater in
accordance with ANSI Z83.7/CGA 2.14. Other standards
govern the use of fuel gases and heating products for
specific uses. Your local authority can advise you about
these. The primary purpose of construction heaters is to
provide temporary heating of buildings under construction,
alteration or repair. Properly used, the heater provides
safe economical heating. Products of combustion are
vented into the area being heated.

We cannot foresee every use which may be made of our
heaters. Check with your local fire safety authority if

you have questions about heater use.

Other standards govern the use of fuel gases and
heat producing products for specific uses. Your local
authorities can advise you about these.

Propane gas is odorless. An odor-making agent is added
to propane gas. The odor helps you detect a propane
gas leak. However, the odor added to propane gas can
fade. Propane gas may be present even though no
odor exists.

Install and use heater with care. Follow all local
ordinances and codes. In the absence of local
ordinances and codes, refer to the Standard for Storage

and Handling of Liquefied Petroleum Gas, ANSI/NFPA
58 and the Propane Installation Code, CAN/CGA
B149.2. This instructs on the safe storage and handling

of propane gases.

WA RN I NG : NO T F OR H OME O R
RECREATIONAL VEHICLE USE.

2 Operator’s Manual

Contents

Page

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

Controls ................................................................... 9

Preparation ............................................................... 10

Installation ................................................................ 12

Operation ................................................................ 13

Troubleshooting

Service .................................................................... 16

Storage .................................................................... 19

Specifications ......................................................... 20

Wire Diagram ............................................................ 21

Warr

anty .................................................................. 22

Notes ......................................................................... 23

..................................................... 14

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 mono

xide 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.

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 la
(UL 2034, IAS 6-96, or CSA 6.19.01).

test safety standards for carbon monoxide alarms.

Test your carbon monoxide alarm frequently and replace dead batteries.

Operator’s Manual 5

ELECTRICAL HAZARDS

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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. The electrical connections and grounding of the heater shall
follow the National Electric Code, ANSI/NFPA 70 or the Canadian
Electrical Code, Part 1.

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.

IMPORTANT SAFETY INSTRUCTIONS

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

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

2. Minimum heater clearances from combustible materials: Outlet:
8 Ft. (2.44 m), Sides: 2 Ft. (60.96 cm), Top: 6 Ft. (1.83 m), Rear:
2 Ft. (60.96 cm).

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

7. Keep space heater area clear and free from combustible materials,
gasoline, paint thinner and other flammable vapors and liquids.

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

9. Never leave a space heater plugged in without adult supervision
if children or animals are likely to be present. Do not leave heater
unattended.

10. Never move, handle or service a hot or operating heater. Severe
burns may result. You must wait 15 minutes after turning heater
off.

6 Operator’s Manual

IMPORTANT SAFETY INSTRUCTIONS

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

12. 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.

13. Unplug space heater when not in use.

14. This product has been approved for use in the Commonwealth
of Massachusetts.

15. Use only the hose and factory preset regulator provided with
the heater.

16. Use only propane gas set up for vapor withdrawal.

17. For indoor use only. Do not use heater outdoors.

18. Do not use heater in basement or below ground level. Propane
gas is heavier than air. If a leak occurs, propane gas will sink
to the lowest possible level.

19. Keep heater at least six feet from propane tank(s). Do
not point heater at propane tank(s) within 20 feet.

20. Keep propane tank(s) below 100° F (37.8° C).

21. Check heater for damage before each use. Do not use
a damaged heater.

22. Check hose before each use of heater. If highly worn or
cut, replace with hose specified by manufacturer before using
heater.

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

24. Keep heater away from strong drafts, wind, water spray, rain
or dripping water.

25. To prevent injury, wear gloves when handling heater.

26. Do not alter heater. Keep heater in its original state.

27. Do not use heater if altered.

28. Turn off propane supply to heater when not in use.

29. Use only original replacement parts. This heater must
use design-specific parts. Do not substitute or use generic parts.
Improper replacement parts could cause serious or fatal
injuries.

30. This heater is equipped with a thermostat. Heater may start at
anytime!

31. Do not adjust regulator below 7 PSIG or above 20 PSIG.

SAVE THESE INSTRUCTIONS

Operator’s Manual 7

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 hea

ter, disconnect all equipment

and battery (if equipped) and allow unit to cool down.
Service space heater in a clean dry flat area.

8 Operator’s Manual

CONTROLS

REAR VIEW

A

B

C

D

E

F

G

H

I

AC-375LP

Controls

A -- Hot Air Outlet (Front)
B -- Handle
C -- Fan Guard

D -- Power Cord
E -- Hose / Regulator Assembly
F -- Inlet Connector

G -- On / Off Switch
H -- Outer Shell
I -- Thermostat Knob

Operator’s Manual 9

Preparation

VENTILATION

WARNING: FOLLOW THE MINIMUM FRESH, OUTSIDE
AIR VENTILATION REQUIREMENTS. IF PROPER
FRESH, OUTSIDE AIR VENTILATION IS NOT
PROVIDED, CARBON MONOXIDE POISONING
CAN OCCUR. PROVIDE PROPER FRESH, OUTSIDE
AIR VENTILATION BEFORE RUNNING HEATER.

Provide a fresh air opening of at least three square feet for
each 100,000 Btu/Hr rating. Provide extra fresh air if more
heaters are being used.

PROPANE SUPPLY

Propane / L.P. gas and Propane / L.P. tank(s) are to be
furnished by the user.

Use this heater only with a propane vapor withdrawal
supply system. See Chapter 5 of the Standard for Storage

and Handling of Liquefied Petroleum Gas, ANSI/NFPA 58

and the Propane Installation Code CAN/CGA B149.2. Your
local library or fire department will have this booklet.

The amount of Propane / L.P. gas ready for use from
Propane / L.P. tanks varies. Two factors decide this amount:

1. The amount of Propane / L.P. gas in tank(s)

2. The temperature of tank(s)
The chart below shows the number of 100 pound (45

kg) tanks needed to run this heater. Do not operate this

product with any tanks smaller than 100 pounds.

Temperature at Tank # of Tanks

40°F (5°C) and above 3
Below 40°F (5°C) (Use larger tank)

Less gas is vaporized at lower temperatures. You may
need two or more 100 pound (45 kg) tanks or one larger
tank in colder weather. Your local propane gas dealer will
help you select the proper supply system. The minimum
surrounding air temperature rating for each heater is

-20° F (-29° C).

10 Operator’s Manual

Preparation

Air For Combustion

Air For Heating

Cool
Air In
(Back)

Motor

Nozzle

Power Cord

Hose/
Regulator
Assembly

Solenoid Valve

Ignitor

Combustion Chamber

DSI

Fan

Clean
Heated
Air Out
(Front)

THEORY OF OPERATION

The Fuel System: The hose / regulator assembly attaches to the propane gas supply. The propane gas moves

through the solenoid valve and out the nozzle.

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 direct spark ignitor (DSI) sends voltage to the ignitor. The ignitor ignites the fuel and

air mixture.

The Safety Control System: This system causes the heater to shut down if the flame goes out. The motor will

continue to run, but no heat is produced.

Operator’s Manual 11

Installation

Propane/LP
Tank

Supply
Valve

Hose

POL Fitting

Regulator

Adjustment Knob
(pointing down)

Hose

Inlet Connector

INSTALLATION

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.

WA RN I NG: TEST ALL GAS PIP ING AND
CONNECTIONS FOR LEAKS AFTER
INSTALLING OR SERVICING. NEVER
USE AN OPEN FLAME TO CHECK FOR
A LEAK. APPLY A MIXTURE OF LIQUID
SOAP AND WATER TO ALL JOINTS.
BUBBLES FORMING SHOW A LEAK.
CORRECT ALL LEAKS AT ONCE.

1. Provide Propane / L.P. supply system (see Propane / L.P.
Supply section).

2. Connect POL fitting on hose / regulator assembly to
Propane / L.P. tank(s). Turn POL fitting counterclockwise
into threads on tank. Tighten firmly using wrench.

IMPORTANT: Tighten regulator with black adjustment

knob pointing down. Pointing adjustment knob down
protects regulator from weather damage.

3. Connect hose to inlet connector. Tighten firmly using a
wrench. (Fig. 2)

IMPORTANT: Extra hose or piping may be used if needed.

Install extra hose or piping between hose/regulator
assembly and Propane / L.P. tank. You must use the
regulator supplied with heater.

4. Open propane supply valve on Propane / L.P. tank(s)
slowly.

Note: If not opened slowly, excess-flow check valve on

Propane / L.P. tank will stop gas flow. If this happens,
you may hear a click inside the regulator assembly. To
reset the excess flow check valve, close Propane / L.P.
supply valve and open again slowly.

5. Adjust regulator between 7 and 20 PSIG.

Note: Higher regulator setting will allow heater to produce

more heat.

6. Check all connections for leaks.

7. Close Propane / L.P. supply valve.

(Fig. 1)

(Fig. 2)

WARNING: DO NOT ADJUST REGULATOR
BELOW 7 PSIG OR ABOVE 20 PSIG.
HEATER MAY NOT RUN PROPERLY.

12 Operator’s Manual

Operation

OPERATION

WA R NING: FOL LO W T HE MI N IMUM FRES H,
OUTSIDE AIR VENTILATION REQUIREMENTS.
IF PROPER FRESH, OUTSIDE AIR VENTILATION
IS NOT PR OV IDED , CA R BON MON OX IDE
POISONING CAN OCCUR. PROVIDE PROPER
FRESH, OUTSIDE AIR VENTILATION BEFORE
RUNNING 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. Locate heater on stable and level surface. Make sure strong
drafts do not blow into front or rear of heater.

4. Plug power cord of heater into a three-prong, grounded
extension cord. Extension cord must be at least 6 feet (1.83
m) long, UL listed and of a proper size. See Extension Cord
Chart.

5. Plug extension cord into a 120 volt/60 hertz, 3-hole, grounded
outlet.

6. Open propane supply valve on Propane / L.P. tank(s) slowly.

Note: If not opened slowly, excess-flow check valve on

Propane / L.P. tank will stop gas flow. If this happens, you may
hear a click inside the regulator assembly. To reset the excess­flow check valve,close Propane / L.P. supply valve and open
again slowly.

7. Make sure regulator is set between 7 and 20 psig.

Note: Higher regulator setting will allow heater to produce more

heat.

8. Turn on/off switch to the ON position. Adjust thermostat to
desired setting. If heater does not start, thermostat setting may
be too low. Turn thermostat knob to higher position to start
heater.

Note: If heater does not start, turn on/off switch to the OFF position.

Wait ten seconds for safety control to reset, then try again.

Extension Cord Size Requirement

Length of Cord: Rated Cord:
Up to 50 feet (15 m) 18 AWG
51 to 100 feet (15.5 to 30.48 m) 16 AWG
101 to 200 feet (30.78 to 60.96 m) 14 AWG

STOP SPACE HEATER:

1. Tightly close Propane / L.P. supply valve on propane
tank(s).

2. Wait a few seconds. Heater will burn gas left in supply
hoses.

3. Turn ON/OFF switch to the OFF position.

4. Unplug heater.

TO RESTART HEATER
If safety control stops gas flow to heater, motor will continue to
run.

1. Turn on/off switch to the OFF position.

2. Wait ten seconds, then turn on/off switch to the ON position.

If heater does not restart:

1. Check manual valves (if any) and supply valves (on Propane
/ L.P. tank). Make sure they are open.

2. Check fuel level in Propane / L.P. tank(s). If fuel level is too
low, contact local Propane / L.P. gas company.

If heater still does not restart, contact your local service center.

Operator’s Manual 13

:

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

Fan does not turn when heater
is plugged in.

Heater will not ignite.

No electrical power to heater.

Fan hitting inside of heater shell.

Fan blades bent.

Defective motor.

User did not follow installation or
operation instructions properly.

Check voltage to electrical outlet. If volt­age is good, check heater power cord
for breaks.

Adjust motor / fan mount to keep fan
from hitting inside of heater shell.

Replace fan.

Replace motor.

Repeat installation and operation
instructions.

No spark at ignitor. To test for spark,
see "Service: Ignitor" and follow
step 8. If you see spark at ignitor,
have heater serviced by qualified
service person. If no spark seen:

a. Loose or disconnected ignitor
wire

b. Wrong spark gap

c. Bad ignitor electrode

d. Bad spark transformer

a. Check ignitor wire. Tighten or reattach
loose ignitor wire. See "Maintenance:
Spark Transformer" for ignitor wire
location

b. Set gap between ignitor electrode and
nozzle to .13"/.15" (3.3/3.8 mm)

c. Replace ignitor electrode. See
"Maintenance: Ignitor".

d. Replace spark transformer. See
"Maintenance: Spark Transformer".

14 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
Heater shuts down while

running.

Propane supply may be inadequate.

High surrounding air temperature
causing thermal limit device to shut
down heater.

Restricted air flow.

Damaged fan.

Excessive dust or debris in
surrounding area.

WARNING: Use only in areas free

a. Refill tank
b. Provide additional and/or larger
tanks. See "Preparation: Propane
Supply".

This can happen when running heater
in temperatures above 85° F (30° C).
Run heater in cooler temperatures.

Check heater inlet and outlet. Re­move any obstructions.

Replace fan. See "Maintenance:
Fan".

Clean heater. See "Maintenance".

of high dust content.

Heater producing odor.

Gas leak

Heater not operating on a 100 lb.
propane / L.P. cylinder. Insufficient
propane / L.P. gas will result in odor.

Propane / L.P.... supply tank is

"freezing up". Evaporation and
consumption rate of propane from
supply tank is to great for the size of
the tank and air temperature

Check all connections for leaks. Apply
mixture of liquid soap and water to
gas joints. Bubbles forming show a
leak that must be corrected

To obtain correct mixture of propane
/ L.P. gas and air, use a larger cylin

­der size, i.e. 100 lb. (minimum) See
"Preparation: Propane Supply".

a. Use a larger supply cylinder size,
i.e. 100 lb. (minimum).

b. Reduce consumption rate by
operating the heater at LOW
setting temporarily until frost
disappears from the tank

Operator’s Manual 15

Service

MAINTENANCE:

WARNING: TO AVOID RISK OF BURN AND
ELECTRICAL SHOCK, NEVER ATTEMPT
TO SERVICE SPACE HEATER WHILE IT IS
PLUG G ED I N, OP ER AT I NG , OR HO T .

KEEP HEATER CLEAR AND FREE FROM
COMBUSTIBLE MATERIALS, GASOLINE AND
OTHER FLAMMABLE VAPORS AND LIQUIDS

DO NOT BLOCK THE FLOW OF COMBUSTION
OR VENTILATION AIR.

1. Keep heater clean. Clean heater annually or as
needed to remove dust and debris. If heater is dirty or
dusty, clean heater with a damp cloth. Use household
cleaners on difficult spots.

2. Inspect heater before each use. Check connections
for leaks. Apply mixture of liquid soap and water to
connections. Bubbles forming show a leak. Correct
all leaks at once.

3. Inspect hose / regulator assembly before each use. If
hose is highly worn or cut, replace with hose specified
by manufacturer.

4. Have heater inspected yearly by a qualified service
agency.

5. Keep inside of heater free from combustible and
foreign objects. Remove motor and other internal
parts if needed to clean inside of heater.

6. Clean fan blades each season or as needed.

16 Operator’s Manual

MAINTENANCE (CONTINUED):

T

erminal

Board

Grounding Screw

Thermal
Switch Wire

Solenoid
Valve

Motor Wires

Mounting
Bolts

Motor
Mount

Rear
Mounting
Hole

First
Hole

Motor
Shaft

Fan

Setscrew

Service

WARNING: NEVER SERVICE HEATER WHILE
IT IS PLUGGED IN, CONNECTED TO
PROPANE SUPPLY, OPERATING OR
HOT. SEVERE BURNS AND ELECTRICAL
SHOCK CAN OCCUR.

CLEANING FAN:
Clean fan every 500 hours of operation or as needed.

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

2. Remove side cover.

3. Detach the five motor wires from parts under heater
shell. Be sure to detach only wires coming from motor.

(Fig. 3)

(Fig. 3)

The five motor wires are:

• white wire—to terminal board

• black wire—to terminal board

• blue wire—to thermal switch wire

• orange wire—to solenoid valve

• green wire—to grounding screw on shell

4. Remove fan guard from rear of heater.

5. Reach into rear of heater shell. Carefully pull motor wires
through hole in bottom of shell. (Fig. 4)

Note: Pull wires through hole one at a time.

(Fig. 4)

6. Remove nuts and mounting bolts holding motor mount
to shell. Use 3/8" nut-driver and 7/16" wrench.

7. Carefully pull motor and fan out of shell.

IMPORTANT: Be careful not to damage fan. Do not set

motor and fan down with the weight resting on fan. This
could damage fan pitch.

8. Turn motor and fan around. Place motor and fan into
shell backwards.

Note: Motor will go into shell first (Fig. 5).

9. Line up rear mounting holes in shell with first hole on
each side of motor mount (Fig. 5).

Note: When holes are lined up, fan should be outside of

(Fig. 5)

shell.

10. Holding mounting bolt, carefully reach through fan
blades into rear of heater. Be careful not to damage
fan pitch. Insert bolt through motor mount and shell.
With free hand, attach nut, finger tight. Repeat process
for other mounting hole.

11. Use 1/8" hex wrench to loosen setscrew which holds

12. Slip fan off motor shaft.

fan to motor shaft (Fig. 6).

13. Clean fan using soft cloth moistened with kerosene or
solvent.

Operator’s Manual 17

(Fig. 6)

Service

Fan

Hub

Setscrew

Motor
Shaft

CLEANING FAN (CONT.):

14. Dry fan thoroughly.

15. Replace fan on motor shaft. Make sure setscrew is
touching back of flat surface on motor shaft (Fig. 7).

16. Place setscrew on flat of shaft. Tighten setscrew firmly
(40-50 inch-pounds).

17. Remove two nuts and bolts securing motor mount to
shell.

18. Pull motor and fan from shell. Turn motor and fan
around. Carefully place back in shell. Note: Fan will
go into shell first.

19. Line up mounting holes in shell with holes on motor
mount. Replace four bolts through shell and motor
mount. Insert bolts from outside of heater. Tighten nuts
firmly.

20. Route motor wires through hole in bottom of shell
(Fig. 4).

21. Connect motor wires as follows (Fig. 3):

• white wire—to terminal board

Note: Attach to empty connector on white wire side of

terminal board.

• black wire—to terminal board

Note: Attach to empty connector on black wire side of

terminal board.

• blue wire—to thermal switch wire

• orange wire—to solenoid valve

• green wire—to grounding screw on shell

22. Replace side cover.

23. Replace fan guard.

(Fig. 7)

18 Operator’s Manual

Storage

STORAGE

CAUTION: DISCONNECT HEATER FROM
PROPANE / L.P. SUPPLY TANK(S).

1. Store

2. Place plastic cover caps over brass fittings on inlet

3. Store in dry, clean and safe place. Do not store

4. When taking heater out of storage, always check

Propane / L.P. tank(s) in safe manner. See

Chapter 5 of Standard for Storage and Handling of

Liquefied Petroleum Gases, ANSI/NFPA 58 and the
Propane Installation Code CAN/CGA B149.2. Follow

all local codes. Always store propane tanks outdoors.

connector and hose / regulator assembly.

hose / regulator assembly inside heater combustion
chamber.

inside of heater. Insects and small animals may place
foreign objects in heater. Keep inside of heater free
from combustible and foreign objects.

Operator’s Manual 19

Specifications

ITEM SPECIFICATION

Model Size AC-375LP

Output Rating (BTU / Hr) 225,000 to 375,000

Fuel Propane / L.P. Vapor Only

Fuel Consumption:
(Gal. Per Hr / Liters Per Hr) Min: 2.5 / 9.4
Max: 4.0 / 15
(Pounds Per Hr / Kilograms Per Hr) Min: 10.4 / 4.7
Max: 17.4 / 7.9

Supply Pressure to Regulator:
Minimum (for input adjustment) 25 PSIG / 172kPa
Maximum Tank Pressure

Regulator Outlet Pressure 7-20 PSIG / 48 to 138 kPa

Hot Air Output (Approx.) 1500 CFM / 42.5 cubic meter / minute

Motor RPM 1725

Motor HP 1/5

Electric Input 120V / 60Hz

Amperage (Normal Run) 4.2

Ignition Electronic Direct Spark, D.S.I.

Shipping Weight
(Approximate Pounds /
Kilograms) 48 / 21.8

Space Heater Weight
(Approximate Pounds /
Kilograms) 41 / 18.6

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)

20 Operator’s Manual

Electrical Ladder Diagram

Green

Black

White

Thermal Switch

Blue

Motor

Line

Ground

Neutral

White

White

Orange

Orange

Green

Black

Connector

Blue

Blue

Ignitor

Solenoid

Valve

Direct Spark

Ignitor

Centrifugal

Switch

Green

Green

Black

T

T

Green

Green

Solenoid

Valve

Motor

On/Off
Switch

Green

Power

Cord

T

Blue

Blue

Black

White

DSI

Control

Orange

Ignitor

Thermal

Switch

Orange

Terminal

Board

White White

Black Black

Blue

Connector

Blue

Connector

Connector

Blue

Black

T

Wiring Diagram

Wire Diagram

Operator’s Manual 21

STATEMENT OF WARRANTY

John Deere warrants all parts, (except those referred to below), of your new space heater
to be free from defects in materials and workmanship during the following periods:

For One (1) Year from the date of original purchase.

Defective parts not subject to normal wear and tear will be repaired or replaced at
our option during the warranty period. In any event, reimbursement is limited to the
purchase price paid.

EXCLUSIONS

1. This warranty does not cover parts damaged due to normal wear, misapplication,
misuse, operation at other than recommended. Failure to follow recommended
operating and maintenance procedures also voids warranty.

2. The use of other than genuine manufacturer repair parts will void warranty.

3. Warranty will be void if used in any application other than consumer / homeowner.
Parts returned, prepaid to our factory or to an Authorized John Deere Service Center
will be inspected and replaced free of charge if found to be defective and subject
to warranty. There are no warranties which extend beyond the description of the
face hereof. Under no circumstances shall the manufacturer bear any responsibility
for loss of use of the unit, loss of time or rental, inconvenience, commercial loss or
consequential damages.

For Service or Warranty Consideration, contact

Mi-T-M

®

Corporation, 8650 Enterprise Drive, Peosta, IA 52068

1-877-JD-KLEEN / (1-877-535-5336) Fax [phone]

Monday - Friday 8:00 a.m. - 5:00 p.m. CST

22 Operator’s Manual