Desa B50G Manuel utilisateur

PORTABLE

FORCED

AIR HEATERS

OWNER’S MANUAL

IMPORTANT

Read and understand this manual before assembling, starting, or servic-

ing heater. Improper use of heater can cause serious injury. Keep this

manual for future reference.

Heater Models:

B50G and REM50B

ARL LOGO G 004

102016

Safety Information.........................................................................2

Product Identiﬁcation .................................................................... 4

Unpacking .....................................................................................4

Theory of Operation ......................................................................4

Fuels ..............................................................................................5

Ventilation .....................................................................................5

Operation .......................................................................................6

Storing, Transporting, or Shipping................................................7

Preventative Maintenance Schedule ............................................. 7

Troubleshooting.............................................................................8

Service Procedures ........................................................................ 9

Upper Shell Removal..............................................................9

Fan........................................................................................... 9

Air Output, Air Intake, and Lint Filters..................................9

Pump Pressure Adjustment..................................................... 10

Fuel Filter................................................................................ 10

Spark Plug............................................................................... 10

Nozzle .....................................................................................11

Pump Rotor ............................................................................. 11

Speciﬁcations................................................................................. 12

Wiring Diagram............................................................................. 12

Technical Service .......................................................................... 12

Replacement Parts ......................................................................... 13

Accessories ....................................................................................13

Illustrated Parts Breakdown and Parts List ................................... 14

Warranty and Repair Service ........................................................Back Cover

CONTENTS SECTION PAGE

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.

Carbon Monoxide Poisoning: 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 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.

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.

WARNINGS

SAFETY

INFORMATION

DANGER

Carbon monoxide poisoning may lead to death!

102016

SAFETY

INFORMATION

Continued

WARNINGS

(Continued)

• Use only kerosene or No. 1 fuel oil to avoid risk of ﬁre or explosion. Never use

gasoline, naphtha, paint thinners, alcohol, or other highly ﬂammable fuels.

• Fueling

a) Personnel involved with fueling shall be qualified and thoroughly familiar with

the manufacturer's instructions and applicable federal, state, and local regula-

tions regarding the safe fueling of heating units.

b) Only the type of fuel specified on the heater's data plate shall be used.

c) All flame, including the pilot light, if any, shall be extinguished and the heater

allowed to cool, prior to fueling.

d) During fueling, all fuel lines and fuel-line connections shall be inspected for leaks.

Any leaks shall be repaired prior to returning the heater to service.

e) At no time shall more than one day's supply of heater fuel be stored inside a

building in the vicinity of the heater. Bulk fuel storage shall be outside the struc-

ture.

f) All fuel storage shall be located a minimum of 25 feet from heaters, torches,

welding equipment, and similar sources of ignition (exception: the fuel reservoir

integral with the heater unit).

g) Whenever possible, fuel storage shall be confined to areas where floor penetra-

tions do not permit fuel to drip onto or be ignited by a fire at lower elevation.

h) Fuel storage shall be in accordance with the federal, state, or local authority hav-

ing jurisdiction.

• Never use heater where gasoline, paint thinner, or other highly ﬂammable vapors are

present.

• Follow all local ordinances and codes when using heater.

• Heaters used in the vicinity of tarpaulins, canvas, or similar enclosure materials

shall be located a safe distance from such materials. The recommended mini-

mum safe distance is 10 feet. It is further recommended that these enclosure

materials be of a fire retardant nature. These enclosure materials shall be se-

curely fastened to prevent them from igniting or from upsetting the heater due to

wind action.

• Use only in well-vented areas. Before using heater, provide at least a three-square-

foot opening of fresh, outside air for each 100,000 Btu/Hr of rating. This heater

producescarbonmonoxide,whichislistedbytheStateofCaliforniaasareproductive

toxin under Proposition 65.

• Use only in places free of ﬂammable vapors or high dust content.

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

• Use only a three-prong, grounded extension cord.

• Minimum heater clearances from combustibles:

Outlet: 8 Ft. Sides: 4 Ft. Top: 4 Ft. Rear: 4 Ft.

• Locate heater on a stable and level surface if heater is hot or running or a ﬁre may

occur.

• When moving or storing heater, keep heater in a level position or fuel spillage may

occur.

• Keep children and animals away from heater.

• Unplug heater when not in use.

• When used with thermostat, heater may start anytime.

• Never use heater in living or sleeping areas.

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

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

• Never attach duct work to front or rear of heater.

102016

PRODUCT

IDENTIFICATION

35/50/70,000 BTU/HR DOMESTIC PFA/PV 042

Handle

Fuel Cap

Lower Shell

Power Cord

Side Cover

Fuel Tank

Hot Air Outlet

Air Filter

End Cover

Fan Guard

Upper Shell

Flame-Out Control

Reset Button

Figure 1 - Models B50G and REM50B

1. Remove all packing items applied to heater for shipment.

2. Remove all items from carton.

3. Check items for shipping damage. If heater is damaged, promptly inform

dealer where you bought heater.

UNPACKING

The Fuel System: The air pump forces air through the air line. The air is then

pushed through the burner head nozzle. This air causes fuel to lift 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 electronic ignitor sends voltage to the spark plug.

The spark plug ignites the fuel and air mixture.

The Flame-Out Control System: This system causes the heater to shut down

if the ﬂame goes out.

THEORY OF

OPERATION

THEORY CUTAWAY PFA/OV 003

Combustion

Chamber Spark

Plug Burner

Head Fan

Motor Air Pump

Air Intake

Filter

Cool

Air

Output

Filter

Air Line

To Burner Electronic

Ignitor

Fuel

Filter

Nozzle

Fuel

Tank

Clean

Heated

Air Out

Air For Fuel

System Air For Combustion

And Heating Fuel

Figure 2 - Cross Section Operational View

102016

WARNING

FUELS

Do not use heavy fuels such as No. 2 fuel oil or No. 2 Diesel. Using heavy fuels

will result in:

•clogged fuel ﬁlter and nozzle

•carbon build up on spark plug

•the need of non-toxic anti-icer in fuel during very cold weather

IMPORTANT:

Use a KEROSENE ONLY storage container. Be sure storage

container is clean. Foreign matter such as rust, dirt, or water will cause the flame-

out control to shut down heater. Foreign matter may also require you to clean fuel

system often.

Use only kerosene or No. 1 fuel oil to avoid risk of ﬁre or

explosion. Never use gasoline, naphtha, paint thinners,

alcohol, or other highly ﬂammable fuels.

WARNING

VENTILATION

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 at least a three-square-foot opening of fresh, outside air for each 100,000

Btu/Hr rating. Provide extra fresh air if more heaters are being used.

Example:

A 50,000 Btu/Hr heater requires one of the following:

•a two-car garage door (sixteen foot width) raised at least two inches

•a single-car garage door (nine foot width) raised at least three inches

•two, thirty-inch windows raised at least four inches

102016

OPERATION WARNING

Review and understand the warnings in the Safety

Information Section, pages 2 and 3. They are needed to

safely operate this heater. Follow all local codes when

using this heater.

To Start Heater

1. Follow all ventilation and safety information.

2. Fill fuel tank with kerosene or No. 1 fuel oil.

3. Attach fuel cap.

4. Plug power cord of heater into three-prong, grounded extension cord. Exten-

sion cord must be at least six feet long.

Extension Cord Wire Size Requirements

6 to 10 feet long, use 18 AWG rated cord

11 to 100 feet long, use 16 AWG rated cord

101 to 200 feet long, use 14 AWG rated cord

5. Plug extension cord into standard 120 volt/60 hertz, three-hole, grounded

outlet. Heater will start when extension cord is plugged into outlet. If not,

push in flame-out control reset button (see Figure 3).

Figure 3 - Flame-Out Control Reset Button

Flame-Out

Control Reset

Button

To Stop Heater

1. Unplug extension cord from outlet.

To Restart Heater

1. Wait two minutes after stopping heater.

2. Repeat steps under To Start Heater.

102016

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 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 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 heater.

WARNING

PREVENTATIVE

MAINTENANCE

SCHEDULE Never service heater while it is plugged in, operating, or

hot. Severe burns and electrical shock can occur.

Item How Often How To

Fuel tank Flush every 150-200 hours See Storing, Transporting,

or Shipping, above.

of operation or as needed.

Air output and Replace every 500 hours of See Air Output, Air Intake,

lint ﬁlters operation or once a year. and Lint Filters, page 9.

Air intake Wash and dry with soap and See Air Output, Air Intake,

ﬁlter water every 500 hours of op- and Lint Filters, page 9.

eration or replace as needed.

Fuel ﬁlter Clean twice a heating season See Fuel Filter, page 10.

or replace as needed.

Spark plug Clean and regap every 600 See Spark Plug, pages 10

hours operation or replace and 11.

as needed.

Fan blades Clean each season or as needed. See Fan, page 9 .

Motor Not required/permanently lubricated

102016

Wrong pump pressure

Dirty air output, air intake

and lint ﬁlters

Dirty fuel ﬁlter

Dirt in nozzle

Dirty or bad photocell lens

Bad flame-out control

Heater ignites, but

flame-out control

shuts off heater after

a short period of

time.

WARNING

TROUBLE-

SHOOTING Never service heater while it is plugged in, operating, or

hot. Severe burns and electrical shock can occur.

See Pump Pressure

Adjustment, page 10.

See Air Output, Air Intake

and Lint Filters, page 9.

See Fuel Filter, page 10.

See Nozzle, page 11.

Clean or replace photocell

lens.

Replace flame-out control.

OBSERVED FAULT POSSIBLE CAUSE REMEDY

Heater will not

ignite, but motor runs

for a short period of

time.

Wrong pump pressure

Carbon deposits on spark

plug and/or improper gap

Dirty fuel ﬁlter

Dirt in nozzle

Water in fuel tank

Electronic ignitor not

grounded

Bad electronic ignitor

Motor does not start

when heater is plugged

in, fan rotates slowly

or does not turn.

Flame-out control not reset

Solid state relay not

allowed to reset

Binding pump rotor

See Pump Pressure

Adjustment, page 10.

See Spark Plug, pages 10

and 11.

See Fuel Filter, page 10.

See Nozzle, page 11.

Drain and ﬂush fuel

tank with clean kerosene.

See Storing, Transport-

ing, or Shipping, page 7.

Make sure electronic ig-

nitor mounting is tight.

Replace electronic ignitor.

Press flame-out control

reset button.

Wait two minutes

before trying to restart

heater.

If fan is hard to turn, see

Pump Rotor, page 12.

WARNING: High voltage!

102016

SERVICE

PROCEDURES WARNING

Upper Shell Removal

1. Remove screws along each side of

heater using 5/16" nut-driver. These

screws attach upper and lower

shells together.

2. Lift upper shell off.

3. Remove fan guard.

Never service heater while it is plugged in, operating, or

hot. Severe burns and electrical shock can occur.

Air Output, Air Intake, and

Lint Filters

1. Remove upper shell (see above).

2. Remove ﬁlter end cover screws

using 5/16" nut-driver.

3. Remove ﬁlter end cover.

4. Replace air output and lint ﬁlters.

5. Wash or replace air intake ﬁlter

(see Preventative Maintenance

Schedule, page 7).

6. Replace ﬁlter end cover.

7. Replace fan guard and upper shell.

IMPORTANT:

Do not oil ﬁlters.

Upper

Shell

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.

1. Remove upper shell (see above).

2. Use 1/8" allen wrench to loosen

set-screw which holds fan to motor

shaft.

3. Slip fan off motor shaft.

4. Clean fan using soft cloth mois-

tened 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 5).

7. Place setscrew on ﬂat of shaft.

Tighten setscrew ﬁrmly (40-50

inch-pounds).

8. Replace fan guard and upper shell.

Figure 4 - Upper Shell Removal

Fan

Guard

Lint Filter Air Output

Filter

Fan

Guard

Filter End

Cover

Air Intake

Filter

Figure 6 - Air Output, Air Intake

Figure 5 - Fan Cross Section

Flush

Motor

Fan

Setscrew

Motor

Shaft

102016

Relief

Valve

Pressure

Gauge

Plug

Continued

Pump Pressure

Adjustment

1. Remove pressure gauge plug from

ﬁlter end cover.

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. Set pump pressure at 3.4

psi.

5. Remove pressure gauge. Replace

pressure gauge plug in ﬁlter end

cover.

Spark Plug

1. Remove upper shell (see page 9).

2. Remove fan (see page 9).

3. Remove fuel and air line hoses

from nozzle assembly.

4. Remove spark plug wire from

spark plug.

5. Remove two screws using 5/16"

nut-driver and remove burner

strap.

6. Place hex-body of spark plug into

vise and tighten.

7. Remove spark plug mounting nut

using 11/16" open-end wrench.

8. Remove burner strap from spark

plug.

9. Clean and regap spark plug

electrodes to .055" gap.

10.Replace burner strap onto spark

plug. Rotate burner strap to

position spark plug electrodes (see

Figure 12, page 11).

11.Tighten spark plug with spark plug

mounting nut.

12.Release hex-body of spark plug

from vise.

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.

4. Carefully pry bushing and fuel

ﬁlter out of fuel tank.

5. Wash fuel ﬁlter with clean fuel and

replace in tank.

6. Attach upper fuel line to fuel ﬁlter

neck.

7. Replace side cover.

Figure 7 - Pressure Gauge Plug Removal

Pressure

Gauge

Figure 8 - Adjusting Pump Pressure

Bend Here

to Adjust

Gap

.055" Gap

Figure 11 - Spark Plug Gap

Figure 10 - Spark Plug Removal

Air Line

Hose

Burner

Strap Spark Plug

Wire

Nozzle Assembly

Fuel Line Hose

Spark

Plug

Spark Plug

Mounting Nut

Combustion

Chamber

Fuel Filter

Side

Cover

Upper Fuel Line

Figure 9 - Fuel Filter Removal

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