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Desa B50H Owner's Manual

Portable forced air heater
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PORTABLE
FORCED
AIR HEATER
OWNER'S MANUAL
Models: B50H and REM50C
Heater Size: 50,000 Btu/Hr
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.
®
G 004
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Summary of Contents for Desa B50H

  • Page 1 PORTABLE FORCED AIR HEATER OWNER’S MANUAL Models: B50H and REM50C Heater Size: 50,000 Btu/Hr 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.

  • Page 2: Table Of Contents

    CONTENTS SAFETY INFORMATION SECTION Safety Information ... 2 Product Identification ... 4 Unpacking ... 4 Theory of Operation ... 4 Fuels ... 5 Ventilation ... 5 Operation ... 5 Storing, Transporting, or Shipping ... 6 Preventative Maintenance Schedule ... 6 Troubleshooting ...
  • Page 3 SAFETY INFORMATION Continued 102553 WARNINGS • 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.

  • Page 4: Product Identification

    PRODUCT IDENTIFICATION UNPACKING THEORY OF OPERATION Clean Heated Air Out Hot Air Outlet Lower Shell Fuel Tank Side Cover Ignition Control Assembly (assembly on inside of side cover) Power Cord Figure 1 - 50,000 Btu/Hr Model 1. Remove all packing items applied to heater for shipment. 2.

  • Page 5: Fuels

    FUELS VENTILATION OPERATION 102553 WARNING 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. Do not use heavy fuels such as No. 2 fuel oil or No. 2 Diesel. Using heavy fuels will result in: •...

  • Page 6: Storing, Transporting, Or Shipping

    STORING, TRANSPORTING, OR SHIPPING PREVENTATIVE MAINTENANCE SCHEDULE Note: If shipping, transport companies require fuel tanks to be empty. 1. Drain fuel tank. Drain fuel through fuel cap opening. Be sure all fuel is re- moved. 2. If any debris is noted in old fuel, add 1 or 2 quarts of clean kerosene to tank, stir, and drain again.

  • Page 7: Troubleshooting

    TROUBLE- SHOOTING FAULT CONDITION Motor does not start five seconds after heater is plugged in. Motor starts and runs but heater does not ignite. Heater ignites but ignition control assembly shuts heater off after a short period of time. 102553 WARNING Never service heater while it is plugged in, operating, or hot.

  • Page 8: Service Procedures

    SERVICE PROCEDURES 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. IMPORTANT: Remove fan from motor shaft before removing motor from heater.

  • Page 9: Pump Pressure Adjustment

    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 5). Allow motor to reach full speed. 4. Using a flat blade screwdriver, set the pressure to 3.6 PSI.

  • Page 10: Nozzle

    Nozzle 1. Remove upper shell (see page 8). 2. Remove fan (see page 8). 3. Remove fuel and air line hoses from nozzle assembly. 4. Turn nozzle assembly 1/4 turn to left and pull toward motor to remove. 5. Place plastic hex-body into vise and lightly tighten.

  • Page 11: Specifications

    (Pump Rotor, continued) 10.Install blades, pump plate, air filters, and filter end cover. 11.Replace fan guard and upper shell. 12.Adjust pump pressure (see page 9). Note: If rotor is still binding, proceed as follows. 13. Perform steps 1 through 6 (see page 10). 14.

  • Page 12: Technical Service

    Usually, we will ask you to return the defective part to the factory. Parts Not Under Warranty Contact authorized dealers of this product. If they can’t supply original replacement part(s), call DESA International’s Parts Dept. at 1-800-972-7879 for referral information. When calling DESA International, have ready •...

  • Page 13: Accessories

    If they can not Special tool to check pump supply these accessories or parts, pressure. either contact your nearest Parts Central or DESA International for referral information. Parts Centrals are listed in the Autho- rized Service Center booklet supplied with heater.

  • Page 14: Illustrated Parts Breakdown And Parts List

    ILLUSTRATED PARTS BREAKDOWN 12-1 12-2 12-18 12-17 12-16 Motor and Pump Assembly 12-3 12-4 12-5 12-6 12-7 12-15 12-14 12-13 12-12 12-11 12-8 12-9 12-10 102553...
  • Page 15 Fuel Tank (REM50C) M51108-01 Heat-Shell Shield PARTS AVAILABLE - NOT SHOWN 097646-01 Tradename Decal (B50H) 097764-02 Tradename Decal (REM50C) 101685-09 General Information Decal (B50H) 101685-10 General Information Decal (REM50C) M51017-01 Cushion Grommet (B50H) OPTIONAL ACCESSORIES HA1210 Hang-up Thermostat HA1202 Heavy Duty Wheels and Handle Kit...

  • Page 16: Warranty And Repair Service

    Proof of purchase must be presented with the heater. The heater will be inspected. A defect may be caused by faulty materials or workman- ship. If so, DESA International will repair or replace the heater without charge. REPAIR SERVICE Return the heater to your nearest authorized service center.

This manual is also suitable for:

Arl rem50cArl b50h

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