Desa B50H User's Manual
Contents
1. WARRANTY SERVICE Should your heater require service return it to your nearest authorized service center 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 Repairs not covered by the warranty will be billed at standard prices Illustrated parts lists can be obtained free of charge Send a self addressed stamped envelope to the address listed below List the heater model number and the date located in the lower right corner of this page A service manual may be purchased from the address listed below Send a check for 5 00 payable to DESA International When writing for information regarding your heater be sure to include the model number and serial number as shown on the model plate Each Service Center is independently owned and operated We reserve the right to amend these specifications at any time without notice KEEP THIS WARRANTY Model No Serial No Date of Purchase To be filled in by purchaser DESA INTERNATIONAL Corporate Headquarters 2701 Industrial Drive P O Box 90004 Bowling Green KY 42102 9004 For information write DESA International P O Box 90004 Bowling Green Kentucky 42102 9004 ATTN Customer Service Depart2. Remove filter end cover Replace air output and lint filters 5 Wash or replace air intake filter see Preventative Maintenance Schedule page 6 6 Replace filter end cover 7 Replace fan guard and upper shell Kw IMPORTANT Do not oil filters A WARNING Never service heater while it is plugged in operating or hot Severe burns and electrical shock can occur F Upper Sp Shell Figure 3 Upper Shell Removal eee Fan Motor Motor Shaft Setscrew Figure 4 Fan Cross Section gt Flush Air Intake Filter Filter End Cover Fan Guard RS Lint Filter Air Output Filter Figure 5 Air Output Air Intake and Lint Filters 102553 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 Turn relief valve to right to increase the pressure Turn relief valve to left to decrease the pressure 5 Remove pressure gauge Replace pressure gauge plug in filter end cover Fuel Filter 1 Remove 4 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
3. Fuel Consumption Gal Per Hr Electric Requirements Amperage Normal Run Motor RPM Hot Air Output CFM Pump Pressure psi Shipping Weight Approximate Pounds Heater Weight without Fuel Approximate Pounds Power Plug 120V 60Hz 003 004 Gap 1 Measured With 4 Feeler Gauge Figure 16 Wiring Diagram Sandpaper Figure 14 Sanding Rotor 50 000 Use Only Kerosene or No 1 Fuel Oil 4 0 40 120 V 60 Hz 2 0 1725 175 3 6 35 30 c lgnitor Common Ignition Control Motor Common Photocell Common CA Photocell 4 AC Common L2 102553 TECHNICAL SERVICE REPLACEMENT PARTS You may have further questions about operation or troubleshooting If so contact DESA International s Technical Service Dept at 1 800 323 5190 Note Use only original replacement parts This will protect your warranty cover age for parts replaced under warranty Parts Under Warranty Contact authorized dealers of this product If they can t supply original replacement part s call DESA International s Technical Service Dept at 1 800 323 5190 When calling DESA International have ready e your name e your address e model number of your heater e how heater was malfunctioning e purchase date 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 repla
4. 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 CONTENTS SAFETY INFORMATION SECTION PAGE Safety Information esee neg eain renterne age sa EEEN 2 Product Identification 0 eccceecceceeceesteeeseeceeneeceeeeeenaeeeeaeeeeeeeeeses 4 Unpacking eeii enoeae o e r a A E E ier 4 Theory of Operation sssini reorienti 4 UGS ee ri E E E e R S 5 Ventilation oneens ee E E ei ed ev een ES 5 OJo Stenn O a IPAE E ET N 5 Storing Transporting or Shipping eeeeeseeeseereesesrrerrererresresrrsre 6 Preventative Maintenance Schedule 0 cecceeeeeeseeceeneeeeeeeeeees 6 Tr u blesho ting nyen e we isons E Enner E kein eins 7 Service Procedures siosio essen E A E N eres 8 Upper Shell Removal cece ceeeeeseeeeeneeeeeeseeeeeeeeeeeeseeees 8 AM PEE E T EE E EET 8 Air Output Air Intake and Lint Filters eee eeeeeeeeees 8 Pump Pressure Adjustment 0 eee eseeseesecsseceseceseceseenseeees 9 Fuel Filter cesta cassie dian Aenea eae ees a i 9 NOZI eere a eE tesa E EE dearest RL bete tela tlie deat 10 PUMP ROOK a o eee EE e inte ducsetivecte tes Pies 10 Speci CAatiOMs iner oeiee rie eenn Ear nEn a E ta RE ota AEN 11 Witing Dia grat onesies piane NN eA e
5. fuel filter with clean fuel and replace in tank 6 Attach upper fuel line to fuel filter neck 7 Replace side cover Pressure Gauge Plug Fuel Filter Side Cover Pressure Ex SS Figure 6 Pressure Gauge Plug Removal Figure 7 Adjusting Pump Pressure Figure 8 Fuel Filter Removal Relief Valve 102553 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 6 Carefully remove nozzle from the nozzle adapter using 5 8 socket wrench 7 Blow compressed air through face of nozzle This will free any dirt in nozzle area Inspect nozzle seal for damage 9 Replace nozzle into nozzle adapter until nozzle seats Tighten 1 3 turn more using 5 8 socket wrench 40 45 inch pounds 10 Attach nozzle assembly to burner strap 11 Attach fuel and airline hoses to nozzle assembly 12 Replace fan see page 8 13 Replace fan guard and upper shell oe Pump Rotor Procedure if rotor is binding 1 Remove upper shell see page 8 2 Remove filter end cover screws using 5 16 nut driver 3 Remove filter end cover and air filters 4 Remove pump plate screws using 5 16 nut driver 5 Remove pump plate Remove rotor insert and blades 7 Check for debri
6. hot operating or plugged in heater e Never attach duct work to front or rear of heater 102553 PRODUCT IDENTIFICATION UNPACKING THEORY OF OPERATION Hot Air Outlet Upper Shell X Fan Guard Air Filter End Cover Fuel Cap Side Cover w OS 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 Remove all items from carton 3 Check items for shipping damage If heater is damaged promptly inform dealer where you bought heater 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 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 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 Combustion Chamber Motor Air Pump Ignitor Air Intake Fan Filter q j T C Clean amp Cool Heated m H fe Air Air Out In ea imi
7. lt Air I Le Output Filter N a Fuel eA Fuel Air Line Ignition Control Tank Filter To Burner Assembly Air For Fuel Gz Air For Combustion lt a Fuel a System And Heating Figure 2 Cross Section Operational View 102553 FUELS VENTILATION OPERATION A 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 e clogged fuel filter and nozzle e 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 ignition control assembly to shut down the heater Foreign matter may also require you to clean fuel system often AWARNING 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 two square foot opening of fresh outside air for each 50 000 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 e a 16 foot two car garage door raised
8. two inches e a9 foot single car garage door raised three inches e two thirty inch windows raised five inches A WARNING Review and understand the warnings in the Safety Informa tion 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 Note Ignitor will preheat for five seconds then heater will start To Stop Heater 1 Unplug extension cord from outlet To Restart Heater 1 Wait ten seconds after stopping heater 2 Repeat steps under To Start Heater see above 102553 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 This will prevent exce
9. 9851 1 54 09851 1 67 M11084 29 100647 01 098512 39 M10908 2 M16660 M16656 23 HA3021 102548 01 079980 01 102336 01 M11084 42 M11084 26 M30884 102001 01 100422 02 M22009 M22456 2 M29608 M29632 M29633 M29609 M12461 31 M27694 M10993 1 M22997 M8940 M29612 01 M12461 32 M50016 M8643 2 FHPF3 6C M51105 01 098219 31 M11143 1 NTC 4C M11084 26 DESCRIPTION Handle Upper Shell B50H Upper Shell REM50C Screw 10 16 x 3 4 Screw 10 16 x 1 2 Combustion Chamber Screw 6 32 x 3 8 Photocell Bracket Photocell Assembly Burner Head Assembly Nozzle Ignitor Kit Nozzle Adapter Bracket Screw 6 20 x 3 4 Screw 10 16 x 3 8 Fan Motor and Pump Assembly Motor Pump Body Insert Rotor Pump End Cover Lint Filter Intake Filter Filter End Cover Screw 10 32 x 1 Adjusting Screw Pressure Relief Spring Plug Steel Ball 1 4 diameter Output Filter Screw 10 32 x 1 1 8 Elbow 90 Blade Screw 10 32 x 3 4 Fan Guard Power Cord Strain Relief Bushing Hex Lock Nut 1 4 20 Screw 10 16 x 3 8 Not available as an assembly See OPTIONAL ACCESSORIES APD 32 Pha ODO AB Bana wn ae ao on nn nn nn pppoe enn nnn nO HOD AH This list contains replaceable parts used in your heater When ordering parts be sure to provide the correct model and serial numbers from the model plate then the part number and description of the desired part KEY PART QTY NO NU
10. MBER DESCRIPTION QTY M50631 097461 03AA 101205 01 M30865 02 M11271 8 M50104 02 M11084 26 M10908 12 098511 12 098511 81 M29652 04 079973 01 M50876 02 M10990 3 101695 01 102349 01 102350 01 097702 01 098513 27 098513 20 M51108 01 PARTS AVAILABLE NOT SHOWN 097646 01 097764 02 101685 09 101685 10 M51017 01 OPTIONAL ACCESSORIES HA1210 HA1202 HA1206 HA1180 HA2210 HA3005 HA3014 HA3020 HA1170 Rubber Bumper Side Cover Motor Bracket Bushing Clip Nut Bushing Screw 10 16 x 3 8 Screw 8 32 x 3 8 Lower Shell B50H Lower Shell REM50C Rubber Airline Fuel Line Fuel Filter With Bushing Rubber Bushing Button Plug PCB Support Ignition Control Assembly Fuel Cap Includes Gasket Fuel Tank B50H Fuel Tank REM50C Heat Shell Shield se es eae oa oa on on on on on an on in in CE HA ODM LT Tradename Decal B50H Tradename Decal REM50C General Information Decal B50H General Information Decal REM50C Cushion Grommet B50H Hang up Thermostat Heavy Duty Wheels and Handle Kit Standard Wheels and Handle Kit Air Gauge Kit Fuel Tank Filter Screen Rotor Kit M22456 2 M22009 M8643 2 Filter Kit M29632 M29633 M2961 2 01 Pump Kit M27694 M10993 1 M22997 M8940 Ignition Control Assembly Photocell Tester 102553 WARRANTY AND REPAIR SERVICE LIMITED WARRANTY DESA International warrants this product and any parts thereof
11. POSSIBLE CAUSE No power to heater Bad electrical connection between motor and ignition control assembly or ignition assembly and power cord Binding pump rotor Defective ignition control assembly Defective motor REMEDY Check circuit breaker in electrical panel Check all electrical connec tions See Wiring Diagram page 11 If fan does not turn freely see Pump Rotor page 10 Replace ignition control assembly Replace motor Motor starts and runs but heater does not ignite A WARNING High voltage No fuel in tank Pump pressure incorrect Dirty fuel filter Obstruction in nozzle Water in fuel tank Bad electrical connection between ignitor and ignition control assembly Defective ignitor Defective ignition control assembly Fill tank with kerosene See Pump Pressure Adjust ment pages 9 See Fuel Filter page 9 See Nozzle page 10 Drain and flush fuel tank with clean kerosene See Storing Transporting or Shipping page 6 Check electrical connections See Wiring Diagram page 11 Replace ignitor Replace ignition control assembly Heater ignites but ignition control assembly shuts heater off after a short period of time Pump pressure incorrect Dirty air intake air output and or lint filter Dirty fuel filter Obstruction in nozzle Photocell assembly not properly installed not seeing the flame Dirty photocell lens Bad electrical connect
12. cement part s call DESA International s Parts Dept at 1 800 972 7879 for referral information When calling DESA International have ready e model number of your heater e the replacement part number 102553 ACCESSORIES Purchase accessories and parts from your nearest dealer or service center If they can not supply these accessories or parts 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 DESA International P O Box 90004 Bowling Green KY 42102 9004 1 800 972 7879 Parts Department AIR GAUGE KIT HA1180 Special tool to check pump pressure the temperature you select day and night Helps economize on fuel o f 4 f 8 3 i THERMOSTAT a KIT HA1210 Keeps your building at S O STANDARD WHEELS AND HANDLE KIT HA1206 Makes heater even more portable and convenient Easy to assemble HEAVY DUTY WHEELS AND HANDLE KIT HA1202 For heavy duty applica tions Makes your heater even more portable and convenient IGNITION CONTROL ASSEMBLY PHOTOCELL TESTER HA1170 Special tool used to test the ignition control assembly and photocell 102553 Motor and Pump Assembly BREAKDOWN ILLUSTRATED 102553 PARTS LIST Models B50H and REM50C PART NUMBER M51104 01 0
13. e gasoline naphtha paint thinners alcohol or other highly flammable fuels Continued 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
14. es 11 Technical Services ssiisau tects a e hee ten eit ess 12 Replacement Parts se s0sjecescesseseaveessvacscontsasuootvasenagnieverscetetdeseusavess 12 INCCESSOLICS Ss nane e r a uttes ta e a a cette fons 13 Ilustrated Parts Breakdown and Parts List eeceesceeseeeeeeeees 14 Warranty and Repair Service 0 cece ceeceeseceseceseceeeeeeeeeseeeeeeeeaes Back Cover AWARNINGS 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 ADANGER 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 102553 SAFETY AWARNINGS Continued INFORM ATION e Use only kerosene or No 1 fuel oil to avoid risk of fire or explosion Never us
15. 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 produces carbon monoxide which is listed by the State of California as a reproductive 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 e Unplug heater when not in use e When used with thermostat heater may start anytime e Never use heater in living or sleeping areas e Never block air inlet rear or air outlet front of heater e Never move handle refuel or service a
16. ion between photocell and ignition control assembly Defective photocell Defective ignition control assembly See Pump Pressure Adjust ment page 9 See Air Output Air Intake and Lint Filters page 8 See Fuel Filter page 9 See Nozzle page 10 Make sure photocell boot is properly seated in bracket Clean photocell lens Check electrical connections See Wiring Diagram page 11 Replace photocell Replace ignition control assembly 7 102553 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 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 Slip fan off motor shaft 4 Clean fan using soft cloth mois tened with kerosene or solvent Dry fan thoroughly 6 Replace fan on motor shaft Place fan hub flush with end of motor shaft see Figure 4 7 Place setscrew on flat of shaft Tighten setscrew firmly 40 50 inch pounds 8 Replace fan guard and upper shell W n Air Output Air Intake and Lint Filters 1 Remove upper shell see above 2 Remove filter end cover screws using 5 16 nut driver
17. ment When writing always include model number and serial number 102553 01 Rev B 11 95
18. s in pump If debris is found blow out with compressed air Install insert and rotor 9 Check gap on rotor Adjust to 003 004 if needed see Figure 13 oN oo Note Rotate rotor one full turn to insure the gap is 003 004 at tightest position Adjust if needed Continued Combustion Chamber Nozzle Assembly Nozzle Assembly we Air Line Hose Fuel Line Hose Figure 9 Removing Air and Fuel Line Figure 10 Removing Nozzle Assembly Hoses Nozzle Adapter Pa Fuel Line Air Line Fitting Fitting Figure 11 Nozzle and Nozzle Adapter Pump Plate Air Intake Filter Filter End Cover Fan Guard Air Output Filter Figure 12 Rotor Location 102553 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 through 6 see page 10 14 Place fine grade sandpaper 600 grit on flat surface Sand rotor lightly in figure 8 motion four times see Fig ure 14 15 Reinstall insert and rotor 16 Perform steps 10 through 12 above SPECIFICATIONS WIRING DIAGRAM Gap Adjusting Screw a lt 7 nate SEX Rotor Gap Adjusting Screw Figure 13 Gap Adjusting Screw Locations Output Rating Btu Hr Fuel Fuel Tank Capacity U S Gal
19. ss debris from clogging filters during future use 3 Replace fuel cap Properly dispose of old and dirty fuel Check with local automotive service stations that recycle oil 4 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 A WARNING 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 of operation or as needed Shipping above Air output and Replace every 500 hours of See Air Output Air Intake lint filters operation or once a year and Lint Filters page 8 Air intake Wash and dry with soap and See Air Output Air Intake filter water every 500 hours of op and Lint Filters page 8 eration or replace as needed Fuel filter Clean twice a heating season See Fuel Filter page 9 or replace as needed Ignitor No maintenance required Fan blades Clean each season or as needed See Fan page 8 Motor Not required permanently lubricated 102553 TROUBLE SHOOTING A 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
20. to be free from defects in materials and workmanship for six 6 months from the date of first purchase when operated and maintained in accordance with instructions This warranty is extended only to the original retail purchaser when proof of purchase is provided This warranty covers only the cost of parts and labor required to restore the product to proper operating condition Transportation and incidental costs associ ated with warranty repairs are not reimbursable under this warranty Warranty service is available only through authorized dealers and service centers This warranty does not cover defects resulting from misuse abuse negligence accidents lack of proper maintenance normal wear alteration modification tampering contaminated fuels repair using improper parts or repair by anyone other than an authorized dealer or service center Routine maintenance is the responsibility of the owner THIS EXPRESS WARRANTY IS GIVEN IN LIEU OF ANY OTHER WARRANTY EITHER EX PRESSED OR IMPLIED INCLUDING WARRAN TIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE DESA International assumes no responsibility for in direct incidental or consequential damages Some states do not allow the exclusion or limitation of incidental or consequential damages or limitations or exclusions may not apply to you This Limited War ranty gives you specific legal rights and you may also have other rights which vary from state to state
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