Desa Tech HEATERS OWNER'S MANUAL

KEROSENE HIGH PRESSURE PORTABLE FORCED AIR

HEATERS OWNER’S MANUAL

TABLE OF CONTENTS

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

Product Identiﬁcation ...........................................

Unpacking ........................................................... 3

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

Fuels .................................................................... 4

Ventilation ........................................................... 4

Operation ........................................................... 5

Storing, Transporting of Shipping ........................ 6

Operation with Portable Generator ...................... 6

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

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

Service Procedures ............................................11

Maintenance Kits .............................................. 15

Technical Service .............................................. 15

Accessory .......................................................... 15

Replacement Parts ............................................ 15

Illustrated Parts Breakdown and Parts List ....... 16

Speciﬁcations

Wiring Diagram .................................................. 23

Warranty and Repair Services .............Back Cover

................................................... 23

Fill In For Your Records

Model No. _____________________ (Located on side panel)

Serial No. ______________________ (Located on fuel tank)

Date of Purchase: _______________

Save this manual for future reference.

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SAFETY INFORMATION

IMPORTANT: Read this owner’s manual carefully and completely be fo re tr yi ng to a ssemble, 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.

WARNING: This product conta ins and /or generate s chemicals known to the State of California to cause cancer or birth defects or other reproduc tive harm.

DANGER: Carbon monoxide poisoning may lead to death!

Carbon Mono xide 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 ser viced. 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 warn ings. Keep this manual for reference. It is your guide to safe and proper operation of this heater.

1. Use only kerosene or #1 fuel oil to avoid risk of ﬁre or explosion. Never use gasoline, naphtha, paint thinners, alcohol or other highly ﬂammable fuels.

2. Fueling

a) Personnel involved with fueling shall be

qualiﬁed and thoroughly familiar with the manufacturerʼs instructions and applicable federal, state and local regulations regarding the safe fueling of heating units.

b) Only the type of fuel speciﬁed on the heaterʼs

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 dayʼs supply

of heater fuel be stored inside a building in the vicinity of the heater. Bulk fuel storage shall be outside the structure.

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 penetrations 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 having jurisdiction.

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

4. Follow all local ordinances and codes when using heater.

5. 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. 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 heater due to wind action.

6. 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.

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

8. Use only with the electrical voltage and fre quency speciﬁed on model plate.

9. Heater must be grounded. Use only a properly grounded three-wire extension cord. Plug into grounded outlet only.

10. Minimum heater clearances from combus tibles: Outlet: 8 Ft., Sides: 4 Ft., Top: 4 Ft., Rear: 4 Ft.

11. Locate heater on a stable and level surface while hot or running or a ﬁre may occur.

12. When moving or storing heater, keep heater in a level position or fuel spillage may occur.

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SAFETY INFORMATION

Continued

13. Keep chi ldren and an imals away fro m heater.

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

15. Unplug heater when not in use.

16. This heater has a built-in thermostat. Pluggedin heater may start at anytime.

17. Never use heater in living or sleeping areas.

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

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

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

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

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

23. Warning to New York City Residents For

Use Only At Construction Sites

cordance with applicable NYC codes under NYCFD certiﬁcate of approval #4803, #4899, #4908, #4909 or #4934 or NYC Board of Standards and Appeals calendar number 6259-5A.

in ac-

PRODUCT

IDENTIFICATION

Hot Air Outlet

Lower Shell

Fuel Cap

Fuel Tank

Thermostat

Flame-Out Control Reset Button

Figure 1 - 350,000 Btu/Hr Model

Hot Air Outlet

Lower Shell

Fuel Cap

Upper Shell

Power Cord

Thermostat

Power

Cord

Fuel Tank

Flame-Out Control Reset Button

Figure 2 - 600,000 Btu/Hr Model

UNPACKING

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

2. Remove heater from shipping container.

3. Check heater for any shipping damage. If heater is damaged, promptly inform dealer where you bought heater.

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THEORY OF OPERATION

The Fuel System: The motor turns the fuel pump. The fuel pump pulls fuel from the fuel tank. The

fuel pump pushes fuel through a ﬁlter and a solenoid valve and out the burner head nozzle. 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. It

also allows the fan to continue running after normal shutdown of heater. This cools the combustion chamber.

Combustion Chamber

Clean Heated Air Out

Fuel Tank

Spark Plug

Figure 3 - Cross Section Operational View

Burner Head

Nozzle

Fuel Line To

Air for Combustion and Heating

Solenoid Valve

Fan

Fuel

Motor

Electronic Ignitor

Fuel Pump/ Fuel Filter

Cool Air In

Fuel Pickup Line

Fuel Filter

FUELS

WARNING: Use only kerosene or #1 fuel oil to avoid risk of ﬁre or explosion. Never use gasoline, naphtha, paint thin ners, alcohol or other highly ﬂammable 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 ﬂame-out control to shut down heater. Foreign matter may also require you to clean fuel system often.

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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.

Fresh Air Opening Requirements Heater Size Square Feet Opening

350,000 Btu/Hr 10.5 600,000 Btu/Hr 18.0 Note: If you use more than one heater, provide extra

fresh air. Provide a fresh air opening of at least three square feet for each 100,000 Btu/Hr rating.

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OPERATION

WARNING : Revie w and understand the warnings in the Safety Information section, page 2. They are needed to safely operate this heater.

TO START HEATER

1. Follow all ventilation and safety information.

2. Locate heater to provide maximum circulation of the heated air. Follow all location require ments noted in Safety Information, page 2.

3. Fill fuel tank with kerosene or #1 fuel oil.

4. Attach fuel cap.

5. Set thermostat dial to desired temperature. Note: Thermostat setting must be higher than surrounding air temperature.

6. Plug power cord of heater into three-prong, grounded extension cord. Extension cord must be at least six feet long.

WARNING: Use only a threeprong, grounded extension cord. Use cord with proper wire size to assure 120 volt operation. See Extension Cord Wire Size Requirements below.

Extension Cord Wire Size Requirements 6 to 100 feet long, use 14 AWG rated cord 101 to 200 feet long, use 12 AWG rated cord 201 to 300 feet long, use 10 AWG rated cord 301 to 400 feet long, use 8 AWG rated cord 401 to 500 feet long, use 6 AWG rated cord

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

8. The motor will start when extension cord is plugged into outlet. The heater should ignite at once. If heater does not ignite, restart heater. To restart heater, wait 60 seconds, then push in ﬂame-out control reset button. Flame-out control reset button is at rear of heater near power cord (see Figure 4).

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: If starting heater for ﬁrst time, you may need to prime the pump. If equipped, slightly open bleed

er valve of pump to allow air to escape. Quickly close valve once fuel is seen. Wipe up any excess fuel. If equipped with canister fuel ﬁlter, remove the canister bottom and ﬁll with fuel. Reassemble ﬁlter. Wipe up any excess fuel. You may also have to do this after taking heater out of storage.

Figure 4 - Flame-Out Control Reset

Button

Flame-Out Control Reset Button

TO STOP HEATER

CAUTION: Never unplug heater while heater is running. Heater must go through purge cycle. The purge cycle cools the combustion chamber. Damage to heater can occur if combustion chamber is not cooled. Do not restart heater until purge cycle is complete.

1. Turn thermostat dial to lowest temperature setting. This will cause heater ﬂame to go out. The motor will continue to run during the purge cycle. This allows the fan to cool the combustion chamber. When the purge cycle is ﬁnished, the motor will stop. Do not unplug heater until purge cycle is ﬁnished.

2. Unplug extension cord from outlet.

3. To temporarily a temperature lower than air around heater. Heater will cycle back on if air temperature around heater matches thermostat setting.

stop heater, set thermostat at

TO RESTART HEATER

CAUTION: Do not restart heater until purge cycle is ﬁnished. The purge cycle cools the combustion chamber.

1. Wait until purge cycle is ﬁnished after stopping heater.

2. Repeat steps under To Start Heater

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FUEL

STORING,

TRANSPORTING OF

SHIPPING

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

1. Drain all fuel from fuel lines and pump/ﬁlter (see Fuel Filters, page 14).

2. Clean and ﬂush fuel ﬁlter in fuel pump if equipped (see Fuel Filters, page 14).

3. Remove drain plug and drain fuel tank.

4. Replace drain plug.

5. 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.

6. Replace fuel cap or drain plug. Properly dis pose of old and dirty fuel. Check with local automotive service stations that recycle oil.

7. Add two gallons (350,000 Btu/Hr) or three gallons (600,000 Btu/Hr) of clean kerosene or #1 fuel oil to fuel tank.

8. Replace fuel cap.

9. Operate heater for 5 minutes (see page 5).

10. Stop heater and let cool completely.

11. Remove drain plug and drain fuel tank.

12. Replace drain plug.

13. Properly dispose of old and dirty fuel.

14. If storing, store heater in a dry location. 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.

Operation,

OPERATION WITH

PORTABLE GENERATOR

WARNING: Before operating heater or any appliance from a portable generator, verify that generator has been properly connected to earth ground. Im proper grounding or failure to ground generator can result in electrocution if a ground fault occurs. Refer to owner’s manual supplied by generator manufacturer for proper grounding procedures.

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

Operation, page 5, for starting, stopping

Refer to and resetting heater procedures.

Ground Lug

Alternator

Copper or Brass Grounding Point

Ground Wire (#10 AWG Stranded-Copper)

Figure 5 - Typical Generator Grounding

Method (Generator construction may

vary from that shown)

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PREVENTATIVE MAINTENANCE SCHEDULE

WARNING: Never service heater while it is plugged in, operating

or hot. Severe burns and electrical shock can occur.

Item

Fuel tank

How Often

Flush every 150-200 hours of operation or as needed

How To

See Storing, Transporting or Shipping, page 6

Filler neck screen

Fuel ﬁlter assembly (Fuel tank)

Fuel ﬁlter lines

Fuel ﬁlter (In pump or external canister)

Spark plug

Fan blades and air deﬂectors

Air passages around burner head

Motor

Check for particles in fuel when ﬁlling fuel tank. Clean when dirty

Clean twice a heating season or replace as needed

Check and tighten loose connections occasionally

Clean fuel ﬁlter element every 250 hours

Clean and regap every 300 hours of operation or replace as needed

Clean each season or as needed

Check each season for dirt and debris

Not required, permanently lubricated

Lift out of fuel tank and rinse with clean kerosene

See Fuel Filters, page 14

See Fuel Lines, page 13

See Fuel Filters, page 14

See Spark Plug, page 11

See Fan Blades and Air Deﬂec- tors, page 11

Remove debris and trash with a clean, soft cloth

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TROUBLESHOOTING

WARNING: Never service heater while it is plugged in, operating or hot. Severe burns and electrical shock can occur. Only a qualiﬁed service person should service and repair heater.

OBSERVED PROBLEM

Motor does not start when heater is plugged in and thermostat set ting is higher than surrounding air temperature

POSSIBLE CAUSE

1. No power or low voltage at

heater due to:

A) Damaged power cord or

extension cord B) Wrong size extension cord C) Heater plugged into outlet

with voltage lower than 120

volt

2. Loose electrical connections

3. Motor ove rload pro tector

tripped due to: A) Dirty fan B) Debris pulled into fan area

by fan C) Binding pump D) Low voltage

4. Flame-out control not reset

5. Damaged ﬂame-out control

6. Damaged power relay

7. Damaged thermostat

8. Binding pump

REMEDY

1. A) Check condition of power cord or extension cord. Repair or replace if damaged

B) Use extension cord with

proper wire size (see To Start Heater, page 5 )

C) Make sure heater is plugged

into 120 volt/60 hertz outlet

2. Check connections. Tighten if loose

3. A) See Fan Blades and Air Deﬂectors, page 11

B) Remove debris from fan

and fan guard area

C) Turn fan by hand. If fan is

hard to turn, see Pump, page 13

D) See steps B and C under

item 1 above

Note: Be sure to reset motor

overload protector by pressing reset button on top of motor

4. Press and release ﬂame-out co nt ro l re se t butt on . See Figure 4, page 5 for button location

5. Replace ﬂame-out control

6. Replace power relay

7. Replace thermostat

8. Turn fan by hand. If fan is hard to turn, see Pump, page 13

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110098-01G

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