Desa Tech M100VT, M140VT, M200VT, RH140VT, RH200VT Owner's Manual

...

PORTABLE FORCED

AIR HEATERS

OWNER’S MANUAL

For more information, visit www.desatech.com

Heater Sizes:

125,000 and 170,000 Btu/Hr Thermostat

100,000 140,000 and 200,000 Btu/Hr Variable Output with Thermostat

IMPORTANT: Read and understand this manual before assembling, starting or servicing heater. Improper use of heater can cause serious injury. Keep this manual for future reference.

TABLE OF CONTENTS

SAFETY INFORMATION ............................................................ 2

PRODUCT IDENTIFICATION ..................................................... 3

UNPACKING............................................................................... 3

FUELS......................................................................................... 3

VENTILATION............................................................................. 3

THEORY OF OPERATION ......................................................... 4

ASSEMBLY................................................................................. 4

OPERATION ............................................................................... 5

OPERATION WITH PORTABLE GENERATOR.......................... 6

STORING, TRANSPORTING, OR SHIPPING............................ 7

PREVENTATIVE MAINTENANCE SCHEDULE ......................... 7

TROUBLESHOOTING ................................................................ 8

SERVICE PROCEDURES .......................................................... 9

SPECIFICATIONS .................................................................... 17

WIRING DIAGRAMS................................................................. 17

ILLUSTRATED PARTS BREAKDOWN AND PARTS LIST ....... 18

WHEELS AND HANDLE PARTS LIST...................................... 24

TECHNICAL SERVICE ............................................................. 25

REPLACEMENT PARTS .......................................................... 25

ACCESSORIES ........................................................................ 25

WARRANTY AND REPAIR SERVICE ........................ Back Cover

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.

SAFETY INFORMATION

WARNINGS

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

DANGER: Carbon monoxide poisoning may lead

to death!

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.

• 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.

• Fueling a)Personnel involved with fueling shall be qualified and thor-

oughly familiar with the manufacturer's instructions and applicable regulations 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 extin-

guished 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 structure.

f) All fuel storage shall be located a minimum of 762cm (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 authority hav-

ing jurisdiction.

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

• Heater must be grounded. Use only a properly grounded threewire extension cord. Plug into grounded outlet only.

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

• Minimum clearance from any combustible materials: 8 feet (244 cm) from hot air outlet; 6 feet (183 cm) from top; and 2 feet (61 cm) from sides and inlet.

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

• Use only in well-vented areas. Before using heater, provide at least a 2800 square cm (three-square-foot) opening of fresh, outside air for each 30 kw (100,000 Btu/Hr) of rating. This heater produces carbon monoxide, which is listed by the State of California as a reproductive toxin under Proposition 65.

• Keep children and animals away from heater at all times.

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

• When used with thermostat, heater may start at anytime.

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

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

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

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

• Never use heater in living or sleeping areas.

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

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

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

• Never attach heater to external fuel tank.

• 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

304.8cm (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.

• Unplug heater when not in use.

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

• Warning to New York City Residents For Use Only At Construction Sites in accordance with ap-

plicable NYC codes under NYCFD certificate of approval #4803, #4899, #4908, #4909, or #4934.

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PRODUCT IDENTIFICATION

UNPACKING

FUELS

VENTILATION

PRODUCT IDENTIFICATION

Upper Shell

Hot Air Outlet

Lower Shell

Fuel Cap/ Gauge

Shroud ON/OFF

Switch

Figure 1 - Variable Output With Thermostat Model

Lower Shell

Fuel Cap/ Gauge

Control Cover

Ignition Control Assembly (On Inside of Control Cover)

Upper Shell

Hot Air Outlet

Heat Output Knob

Thermostat Knob

Fuel Tank

Thermostat Knob

Rear Panel

Handle

Extension Cord Wrap

Handle

Fan Guard

UNPACKING

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

2. Remove all items from carton.

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

FUELS

WARNING: Use only kerosene, #1/#2 diesel/fuel oil, JET A or JP-8 fuels to avoid risk of ﬁre or explosion. Never use gasoline, oil drained from crankcases, naphtha, paint thinners, alcohol or other highly ﬂammable fuels.

Use only kerosene, #1/#2 diesel/fuel oil, JET A or JP-8 fuels. Heavier fuels such as No. 2 fuel oil or No. 2 diesel fuel may also be used but will result in:

• noticeable odor

• additional fuel ﬁlter maintenance

• the need for nontoxic, anti-icer additives in very cold weather Do not use fuels heavier than No. 2 grade or heavy oils such as oil

drained from crankcases. These heavy oils will not ignite properly and will contaminate the heater.

IMPORTANT:

(yellow) storage container. Be sure storage container is clean. Foreign matter such as rust, dirt, or water will cause the ignition control assembly to shut down heater. Foreign matter may also require heater's fuel system to be frequently cleaned.

Use a KEROSENE ONLY (blue) or DIESEL ONLY

Shroud ON/OFF

Switch

Figure 2 - Thermostat Model

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Control Cover

Ignition Control Assembly (On Inside of Control Cover)

VENTILATION

WARNING: Provide a fresh air opening of at least three square feet (2,800 square cm) for each 100,000

Fuel Tank

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Rear Panel

Extension Cord Wrap

BTU/HR rating. Provide extra fresh air if more heaters are being used. The minimum ventilation requirements must be followed to avoid risks associated with carbon monoxide poisoning. Make certain these requirements are met prior to operating heater.

Example:

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

following:

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

12.7 cm (5 inches)

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

20.3 cm (8 inches)

• two, 76.2 cm (30 inch) windows raised 38.1 cm (15 inches)

THEORY OF OPERATION

ASSEMBLY

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 heater to

shut down if the ﬂame goes out.

Clean Heated Air Out

Combustion Chamber

Ignitor

Motor

Fan

Air Pump

Air Intake Filter

Cool Air In

Air Output Filter

ASSEMBLY

These models are furnished with wheels and a rear handle. Wheels, handle, and the mounting hardware are found in the shipping carton.

Tools Needed

• Medium Phillips Screwdriver

• Pliers

1. Slide axle through shroud. Install washers and wheels on axle as shown in Figure 4.

IMPORTANT:

When installing wheels, point extended hub of

wheels toward shroud (see Figure 4).

2. Place cotter pins in axle. Bend cotter pin legs around axle.

3. Install extension cord wraps into handle.

4. Slide handle onto shroud leaving a one inch gap between parts.

5. Place washers onto screws and insert screws into holes in handles.

6. Visually confirm that all six screws are threaded into nuts in the shroud. Push the handle completely into the shroud.

7. Tighten all scews.

Hot Air Outlet

• Hammer

• Flat Blade Screwdriver

Fuel Tank

Figure 3 - Cross Section Operational View

Nozzle

Air For Fuel System

Fuel Filter

Air For Combustion And Heating

Air Line To Burner

Ignition Control Assembly

Fuel

Shroud

Cotter Pin

Air Inlet

Axle

Extended Hub

Washer

Figure 4 - Wheel and Handle Assembly

Wheel

Handle

Screw

Rear Panel

Washer

Extension Cord Wrap

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108481

OPERATION

OPERATION (Thermostat Models)

IMPORTANT: Review and understand the warnings in the needed to safely operate this heater. Follow all local ordinances and codes when using this heater.

TO START HEATER

1. Follow all ventilation and safety information.

2. Locate heater to provide maximum circulation of the heated

3. Fill fuel tank with fuel. Use only kerosene, #1/#2 diesel/fuel

4. Attach fuel cap/gauge.

5. Plug heater’s power cord into approved, grounded, three-wire

6. Plug extension cord into standard 120 volt/60 hertz, 3-prong

7. Turn thermostat knob to the right (clockwise) to the warmest

8. Push ON/OFF switch to the ON (|) position. Light will come on.

9. After heater is running, adjust thermostat knob to the desired

TO STOP HEATER

Push ON/OFF switch to the OFF (O) position.

TO RESET HEATER

1. Push ON/OFF switch to the OFF (O) position and wait 10 sec-

2. Repeat steps under To Start Heater.

Safety Information

air. Follow all location requirements noted in Safety Information, page 2.

oil, JET A or JP-8 fuels to avoid risk of fire or explosion. Never use gasoline, naphtha, paint thinners, alcohol, or other flammable fuels.

extension cord. Extension cord must be at least six feet (1.8 meters) long.

Extension Cord Size Requirement

6 to 10 feet (1.8 to 3 meters) long, use 18 AWG (0.75 mm2) rated cord

11 to 100 feet (3.3 to 30.5 meters) long, use 16 A WG (1.0 mm2) rated cord

101 to 200 feet (30.8 to 61 meters) long, use 14 AWG (1.5 mm2) rated cord

grounded outlet.

position.

Note:

Ignitor will preheat for five seconds, then heater will start.

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.

onds. (Wait two minutes if heater has been running.)

Note:

A cold heater may affect the thermostat setting.

section, page 2. They are

OPERATION (Variable Output with Thermostat Models)

IMPORTANT: Review and understand the warnings in the needed to safely operate this heater. Follow all local ordinances and codes when using this heater.

TO START HEATER

1. Follow all ventilation and safety information.

2. Locate heater to provide maximum circulation of the heated

3. Fill fuel tank with fuel. Use only kerosene, #1/#2 diesel/fuel

4. Attach fuel cap/guage.

5. Plug heater’s power cord into approved, grounded, three-wire

6. Plug extension cord into standard 120 volt/60 hertz, 3-prong

Manual Mode of Operation

1. Adjust HEAT OUTPUT knob to the desired setting.

2. Push ON/OFF switch to the ON (|) position. Light will come on.

3. Heater will run in the HI heat output setting for 10 to 15 sec-

Note:

and HI while the heater is running.

Note:

MOSTAT knob has no affect on the operation of the heater.

Safety Information

air. Follow all location requirements noted in Safety Information, page 2.

oil, JET A or JP-8 fuels to avoid risk of fire or explosion. Never use gasoline, naphtha, paint thinners, alcohol, or other flammable fuels.

extension cord. Extension cord must be at least six feet (1.8 meters) long.

Extension Cord Size Requirement

6 to 10 feet (1.8 to 3 meters) long, use 18 AWG (0.75 mm2) rated cord

11 to 100 feet (3.3 to 30.5 meters) long, use 16 A WG (1.0 mm2) rated cord

101 to 200 feet (30.8 to 61 meters) long, use 14 AWG (1.5 mm2) rated cord

grounded outlet.

Note:

Ignitor will preheat for five seconds, then heater will start.

onds, then automatically adjust to the desired heat output.

HEAT OUTPUT can be adjusted to any setting between LO

In the manual mode of operation, the setting of the THER-

section, page 2. They are

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OPERATION

OPERATION WITH PORTABLE GENERATOR

OPERATION (Variable Output with Thermostat Models)

Continued

Automatic Mode of Operation

1. Set the HEAT OUTPUT Knob to the AUTO setting.

2. Set the THERMOSTAT Knob to the desired temperature.

3. Push ON/OFF switch to the ON (|) position. Light will come on.

4. If the thermostat is calling for heat (ie. room temperature is lower than the desired temperature setting), ignitor will preheat for five seconds, then heater will start in the HI heat output setting.

Note:

Heater will automatically adjust the heat output to precisely maintain the desired temperature. This results in quieter operation and better fuel economy.

Note:

The heat output setting will be lowered automatically as the room temperature approaches the desired setting.

Note:

The heater will shut off when the room temperature is two degrees higher than the desired temperature setting. The heater will restart when the room temperature is two degrees lower than the desired temperature setting.

COOL DOWN MODE (200VT MODEL ONLY)

When operating in the automatic mode

After the desired temperature is reached, the heater will continue to run without burning fuel for 30 seconds to cool down the components inside the heater. This provides added safety for the operator and extends the life of the components.

Note:

During the 30 second cool down period, the heater will not immediately respond to any changes to the temperature setting. If the setting is increased the heater will start after the cool down period if the desired temperature setting is 2 degrees higher than the room temperature. If the setting is lowered during the cool down period, the heater will remain off until the room temperature drops two degrees below the desired temperature setting.

TO STOP HEATER

Push ON/OFF switch to the OFF (O) position.

TO RESET HEATER

1. Push ON/OFF switch to the OFF (O) position and wait 10 seconds. (Wait two minutes if heater has been running.)

2. Repeat steps under To Start Heater.

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. Improper 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 automatic 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.

Refer to Operation, page 5, for starting, stopping, and resetting heater procedures.

Alternator

Ground Lug

Copper or Brass Grounding Point

After a safety shutdown

If heater turns off for safety reasons or it runs out of fuel, the heater will continue to run without burning fuel for 30 seconds to cool down the components inside the heater. This safety shutdown can occur while operating in either the Automatic or Manual mode.

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Ground Wire (#10 AWG Stranded-Copper)

Figure 5 - Typical Generator Grounding Method (Generator construction may vary from that shown)

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STORING, TRANSPORTING, OR SHIPPING

Note:

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

1. Remove drain plug from bottom side of fuel tank and drain all fuel.

2. Replace drain plug.

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. 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:

during next heating season. Using old fuel could damage heater.

Do not store kerosene over summer months for use

STORING, TRANSPORTING, OR SHIPPING

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

Air output and lint ﬁlters

Air intake ﬁlter

Fuel ﬁlter

Ignitor

Fan blades

Motor

How Often

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

How To

See Storing, Transporting, or Shipping, above

See Air Output, Air Intake, and Lint Filters, page 9

See Fuel Filter, pages 10 and 11

See Fan, page 9

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TROUBLESHOOTING

WARNING: Never service heater while it is plugged in, operating, or hot. Severe burns and electrical shock can occur.

FAULT CONDITION

Motor does not start five seconds after heater is plugged in

Motor starts and runs but heater does not ignite

POSSIBLE CAUSE

1. No power to heater

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

3. Thermostat setting is too low

WARNING: High voltage!

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

5. Binding pump rotor

6. Blown fuse (F1, GMA 10A) on ignition control assembly

7. Defective ignition control assembly

8. Defective motor

1. No fuel in tank

2. Pump pressure incorrect

3. Dirty fuel ﬁlter

4. Obstruction in nozzle

5. Water in fuel tank

WARNING: High voltage!

REMEDY

1. Check circuit breaker in electrical panel

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

3. Turn thermostat knob to a higher setting

4. Check all electrical connections. See Wir- ing Diagrams, page 17

5. If fan does not turn freely, see Pump Rotor, page 15

6. See Ignition Control Assembly, page 16

7. Replace ignition control assembly

8. Replace motor

1. Fill tank with kerosene

2. See Pump Pressure Adjustment, page 10

3. See Fuel Filter, pages 10 and 11

4. See Nozzle Assembly, pages 13 and 14

5. Drain and ﬂush fuel tank with clean kerosene. See Storing, Transporting, or Ship- ping, page 7

Heater ignites but ignition control assembly shuts heater off after a short period of time

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6. Bad electrical connection between ignitor and ignition control assembly

7. Defective ignitor

8. Blown fuse (F2) on ignition control assembly

9. Defective ignition control assembly

10. 200VT Model Only: Defective fuel valve

1. Pump pressure incorrect

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

3. Dirty fuel ﬁlter

4. Obstruction in nozzle

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

6. Dirty photocell lens

WARNING: High voltage!

7. Bad electrical connection between photocell and ignition control assembly

8. Defective photocell

9. Defective ignition control assembly

6. Check electrical connections. See Wiring Diagrams, page 17

7. Replace ignitor, see page 12

8. See Ignition Control Assembly, page 16

9. Replace ignition control assembly

10. See Fuel Valve, page 11

1. See Pump Pressure Adjustment, page 10

2. See Air Output, Air Intake, and Lint Filters, page 9

3. See Fuel Filter, pages 10 and 11

4. See Nozzle Assembly, pages 13 and 14

5. Make sure photocell boot is properly seated in bracket

6. Clean photocell lens

7. Check electrical connections. See Wiring Diagrams, page 17

8. Replace photocell

9. Replace ignition control assembly

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