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Desa NTH70-2 User's Manual

1. WO ia PORTABLE FORCED AIR HEATERS OWNER S MANUAL Heater Sizes 35 000 50 000 70 000 100 000 150 000 Btu Hr Models NTH35 2 NTH50 2 NTH70 2 NTH100 2 and NTH150 2 IMPORTANT Read and understand this manual before assembling start ing or servicing heater Improper use of heater can cause serious injury Keep this manual for future reference NUZA PORTABLE FORCED AIR HEATERS SAFETY INFORMATION Awarnines IMPORTANT Read this owner s manual carefully and completely before trying to assemble oper ate or service this heater Im proper use of this heater can cause serious injury or death from burns fire explosion electrical shock and carbon monoxide poisoning A 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 nau sea 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 per sons 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 or
2. SB 0 42 424 4 Pasa sa Qa san Ht OO AHA Baan an an on 4 4 4 4 pH PARTS AVAILABLE NOT SHOWN Not available as an assembly order parts separately 105787 23 BP MOY ia PORTABLE FORCED AIR HEATERS WHEELS AND HANDLES 100 000 AND 150 000 BTU HR MODELS PART NUMBER HA2203 HA2204 M12345 33 M12342 3 M12831 3 NTC 3C 107426 01 M28526 M51015 01 M16801 2 PART DESCRIPTION Handles Handles Screw 10 24 x 1 9 4 Wheel Support Frame Wheel Support Frame Hex Nut 10 24 Wheel Quantity of 2 Cap Nut Axle Axle 24 100 000 Btu Hr QTY m o o pw 150 000 Btu Hr QTY v o on 105787 SPECIFICATIONS Output Rating Btu Hr kw 35 000 10 50 000 15 70 000 20 100 000 30 Fuel Use Only Kerosene or No 1 Fuel Oil Fuel Tank Capacity U S Gal Liters 3 0 11 4 5 0 18 9 5 0 18 9 9 0 34 Fuel Consumption Gal Per Hr Liters Per Hr 28 1 1 37 1 40 52 1 97 79 3 0 Electric Requirements 240 V 50 Hz Same All Models Amperage Normal Run 8 1 0 1 0 1 2 Hot Air Output CFM CMM 140 4 205 5 8 225 6 4 425 12 RPM 1425 2850 2850 2850 WIRING DIAGRAM Power Plug 240 V 50Hz ON Off Switch Ignitor Photocell Ignition Control 105787 25 OWNER S MANUAL 150 000 44 13 5 51 1 1 1 4 1 1 2 500 14 2 2850 GIB MUZ Jy fee mm PORTABLE FORCED AIR HEATERS ACCESSORIES Purchase accessories from your loc
3. 10 Attach nozzle assembly to burner strap 11 Attach fuel and airline hoses to nozzle assembly See Fuel and Airline Re placement and Proper Routing 12 Replace fan see page 13 13 Replace fan guard and upper shell see page 8 Combustion Chamber Nozzle Adapter Bracket Photocell Bracket Nozzle Adapter Assembly Air Line Hose Figure 17 Removing Air and Fuel Line Hoses 35 50 70 000 Btu Hr Models Only 105787 Fuel Line Hose OWNER S MANUAL FUEL AND AIR LINE REPLACEMENT AND PROPER ROUTING Combustion Chamber Nozzle Adapter Bracket Air Line Hose Nozzle Adapter Assembly Fuel Line Photocell Bracket Hose Figure 18 Removing Air and Fuel Line Hoses 100 000 Btu Hr Model Only Combustion Chamber Nozzle Adapter Bracket Photocell Bracket Air Line Nozzle Adapter Figure 19 Removing Air and Fuel Line Hoses 150 000 Btu Hr Model Only Combustion Chamber Nozzle Adapter Assembly Figure 20 Removing Nozzle Adapter Assembly Nozzle Face Nozzle Adapter Air Line Fitting Fuel Line Fitting Figure 21 Nozzle and Nozzle Adapter 11 Assembly 1 2 6 7 Remove upper shell see page 8 Remove side cover screws using 5 16 nut driver Remove side cover Inspect fuel and air line hoses for cracks and or holes If fuel line hose is damaged disconnect from nozzle adapter see Fig ure 17 18 or 19 and from fuel filter see pa
4. PORTABLE FORCED AIR HEATERS ASSEMBLY FOR 100 000 AND 150 000 BTU HR MODELS ONLY These models are furnished with wheels and handles Wheels handles and the mounting hardware are found in the shipping carton Tools Needed e Medium Phillips Screwdriver 3 8 Open or Adjustable Wrench Hammer 1 Slide axle through wheel support frame Install wheels on axle IMPORTANT When installing wheels point extended hub of wheels toward wheel support frame see Figure 3 Hot Air Outlet Fuel Tank Flange B WE Wheel Support Frame TOSS it CapNut 16 o Figure 3 Wheel and Handle Assembly Wheel 3 ee Front Handle Place cap nuts on axle ends Gently tap with hammer to secure Place heater on wheel support frame Make sure air inlet end rear of heater is over wheels Line up holes on fuel tank flange with holes on wheel sup port frame Place front handle and rear handle on top of fuel tank flange Insert screws through handles fuel tank flange and wheel support frame Attach nut finger tight after each screw is inserted After all screws are inserted tighten nuts firmly Rear Handle Extended Hub Axle VENTILATION Ay WARNING Follow the mini mum fresh outside air ventila tion requirements If proper fresh outside air ventilation is not pro vided carbon monoxide poison ing can occur Provide proper fresh outside air ventilation be fore runnin
5. the hole in the lower shell 5 Disconnect fuel line hose and air line hose Remove photocell from photocell bracket see Figure 11 Combustion Nozzle Chamber Adapter Bracket Ignitor Air Ignitor Line Wires Hose Fuel Line l T Ignition Control Assembly Photocell Bracket Photocell Assembly Side Cover Figure 11 Disconnecting Ignitor Wires from Ignition Control Assembly 105787 6 Remove combustion chamber Stand OWNER S MANUAL 10 Replace combustion chamber combustion chamber on end with 11 nozzle adapter bracket on top see Fig ure 12 7 Remove ignitor screw with a 1 4 nut driver Carefully remove ignitor from 15 nozzle adapter bracket Route the ignitor wires back down through the hole in the lower shell Connect wires to the ignition control assembly Replace side cover see Figure 9 or 10 page 8 13 Connect and route fuel line hose and air line hose to burner head See Fuel A CAUTION Donotbendorstrike ignitor element Handle with care and Air Line Replacement and Proper Routing page 11 8 Carefully remove replacement ignitor 14 f Replace photocell in photocell bracket from styrofoam packing Route wires as shown in either Figure 17 18 or 19 page 11 Replace fan see page 13 9 Carefully guide ignitor into opening in nozzle adapter bracket Do not strike 5 ignitor element Attach ignitor to nozzle adapter
6. Lockwasher 1 2 Fan Motor and Pump Assembly Motor Pump Body Screw 10 32 x 3 4 Rotor Insert Pump Rotor Pump End Cover Intake Filter Filter End Cover Steel Ball 1 4 Diameter Relief Spring Adjusting Screw Plug Screw 10 32 x 1 Output Filter Lint Filter Barb Fitting Blade Screw 10 32 x 11 s Rubber Bumper Motor Mounting Bracket Button Plug Ignition Control Assembly BoA Pp OhAB BoB Pe E nn nnn nn pposneen nan pone nn nn nin S E nga PART NUMBER NTC 4C M51114 01 M27417 099213 01 M51345 04 107961 01 M51151 02 M10990 3 M50814 03 09851 1 236 M50104 03 M50104 01 102431 01 M11271 8 RF3 4B 108088 05 097702 01 102349 01 M50400 098872 04 M51077 15 102431 01 102861 01 079010 39 105793 01 079919 01 WLE 3 NPF 3B 097468 01 079010 40 HA2210 103814 01 104998 01 106013 04 105880 01 DESCRIPTION Hex Lock Nut 1 4 20 Fan Guard Drain Plug Includes o Ring Button Plug Fuel Line Fuel Filter Fuel Line Tube Rubber Bushing Airline Lower Shell Bushing Bushing Screw Lockwasher 1 2 Clip Nut Screw 4110 32 x 1 2 Fuel Tank Fuel Cap Includes Gasket P C Board Support Strain Relief Bushing Power Cord Side Cover Screw Lockwasher 1 2 Nylon Locknut Wire Assembly Brown White ON OFF Switch Switch Cover Lockwasher 10 Nut 4410 32 Edge Liner Wire Assembly White Filler Neck Screen Wire Tie Tradename Decal Decal Package Ignition Control Assembly Fuse
7. Output nut driver Filter 5 Remove pump plate 6 Remove rotor insert and blades 7 Check for debris in pump If debris is found blow out with compressed air Blade Pump 8 Install insert and rotor Plate Check gap on rotor Adjust to 076 101 mm 003 004 if needed see Figure 25 Note Rotate rotor one full turn to ensure the gap is 076 101 mm 003 004 at tightest position Adjust if needed Air Intake Filter Filter End Fan Guard 10 Install blades pump plate air filters Insert and filter end cover Rot otor 11 Replace fan guard and upper shell 12 Adjust pump pressure see page 10 Air Output Note If rotor is still binding proceed as iis follows 13 Perform steps 1 through 6 above 14 Place fine grade sandpaper 600 grit Figure 24 Rotor Location 100 150 000 Btu Hr Models on flat surface Sand rotor lightly in figure 8 motion four times see Fig Gap Adjusting ure 26 Screw 15 Reinstall insert and rotor D 16 Perform steps 10 through 12 above Blade 076 101 mm 003 004 Gap O C gt O A Measured With Feeler Gauge i 17 Rotor S andpaper EN Gap Adjusting Screw Figure 25 Gap Adjusting Screw Locations Figure 26 Sanding Rotor 12 105787 SERVICE PROCEDURES Continued FAN IMPORTANT Remove fan from motor shaft before removing motor from heater The weight of the motor resting on the fan could damag
8. 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 minimum safe distance is 304 8cm 10 feet It is further recommended that these enclo sure materials be of a fire retardant na ture These enclosure materials shall be securely 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 2800 square cm three square foot opening of fresh outside air for each 30 kw 100 000 Btu Hr of rating Use only in places free of flammable va pors or high dust content Use only the electrical voltage and fre quency specified on model plate Use only a three prong grounded exten sion cord Minimum heater clearances from com bustibles Outlet 250 cm 8 Ft Sides Top and Rear 125 cm 4 Ft Locate heater on a stable and level sur face 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 plug
9. bracket with screw us ing a 1 4 nut driver see Figure 12 Torque 90 to 1 69 N m 8 to 15 in Ibs Do not over torque 16 Replace fan guard and upper shell see page 8 Ignitor Screw Washer Assembly Ignitor Ignitor Element Nozzle Adapter Bracket Photocell Bracket Nozzle Adapter Combustion Bracket Opening Chamber Figure 12 Ignitor Replacement Continued NUZA PORTABLE FORCED AIR HEATERS SERVICE PROCEDURES Continued AIR OUTPUT AIR INTAKE AND LINT FILTERS 1 Remove upper shell see page 8 2 Remove filter end cover screws using 5 16 nut driver 3 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 IMPORTANT Do not oil filters PUMP PRESSURE ADJUSTMENT 1 Remove pressure gauge plug and plas tic cap 35 50 70 000 Btu Hr Models only 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 Adjust pressure Turn relief valve to right to increase pressure Turn relief valve to left to decrease pressure See specifications below for correct pres sure for each model 5 Remove pressure gauge Replace pres sure gauge plug and plastic cap 35 50 70 000 Btu Hr Models only in filter end cov
10. 2861 01 102349 01 104068 04 097702 01 108088 01 M51108 01 NPF 3B 097785 01 WLE 3 079010 39 105793 01 079919 01 079010 40 PARTS AVAILABLE NOT SHOWN HA2210 103814 01 104974 01 106013 01 105880 01 Power Cord Strain Relief Bushing Hex Lock Nut 1 4 20 Screw Lockwasher 1 2 Rubber Bumper Side Cover Motor Bracket Bushing Clip Nut Bushing Screw Lockwasher 1 2 Screw 1110 32 x 1 2 Lower Shell Rubber Airline Fuel Line Fuel Filter Rubber Bushing Nylon Locknut PCB Support Ignition Control Assembly Fuel Cap Includes Gasket Fuel Tank Shell Heat Shield Nut 10 32 Vinyl Foam Gasket Lockwasher 10 Wire Assembly Brown White ON OFF Switch Switch Cover Wire Assembly White Filler Neck Screen Wire Tie Tradename Decal Decal Package Ignition Control Assembly Fuse MOY ia PORTABLE FORCED AIR HEATERS ILLUSTRATED PARTS BREAKDOWN NTH50 2 50 000 BTU HR MODEL Motor and Pump Assembly O 1249 16 105787 OWNER S MANUAL PARTS LIST 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 NTH50 2 and description of the desired part 50 000 BTU HR MODEL PART NUMBER M51104 01 098511 256 M11084 29 102432 01 098512 67 M10908 2 103154 03 M16656 24 ck 100735 27 102548 05 104056 01 102336 01 M10908 75 10
11. 3347 01 102431 01 103684 01 ck 102001 23 079975 02 M22009 M22456 1 M29608 M29632 M29633 M29609 M12461 31 M27694 M10993 1 M22997 M8940 M29612 01 M12461 31 103676 01 M8643 FHPF3 5C 105780 01 M51105 01 OANDOARWND DESCRIPTION Handle Upper Shell Screw 10 16 x 3 4 Screw Lockwasher 1 2 Combustion Chamber Screw 6 32 x 3 8 Photocell Bracket Photocell Assembly Burner Strap Assembly Nozzle Assembly Ignitor Kit Nozzle Adapter Nozzle Adapter Bracket Screw 6 32 x 7 8 Belleville Washer Screw Lockwasher 1 2 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 Nylon Elbow 90 Blade Screw 10 32 x 5 8 Plastic Cap Fan Guard xx Not available as an assembly order parts separately 105787 pO RHO H AH KH BH BH WO AH HSH BSB BP BP SB SB SB SB sep HH KH KB HB SHB SB SB BPO HON H KH PART NUMBER 098872 04 M50400 NTC 4C 102431 01 M50631 097461 09 101205 01 M30865 02 M11271 8 M50104 02 102431 01 RF3 4B 09851 1 237 M50814 06 M29652 05 108060 03 M10990 3 102861 01 102349 01 104068 04 097702 01 108088 03 M51108 01 NPF 3B 097785 01 WLE 3 079010 39 105793 01 079919 01 079010 40 DESCRIPTION Power Cord Strain Relief Bushing Hex Lock Nut 1 4 20 Screw Lockwasher 1 2
12. C 105780 01 M51105 01 OMANDOARWND DESCRIPTION Handle Upper Shell Screw 10 16 x 3 4 Screw Lockwasher 1 2 Combustion Chamber Screw 6 32 x 3 8 Photocell Bracket Photocell Assembly Burner Strap Assembly Nozzle Assembly Ignitor Kit Nozzle Adapter Nozzle Adapter Bracket Screw 6 32 x 7 8 Belleville Washer Screw Lockwasher 1 2 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 Nylon Elbow 90 Blade Screw 10 32 x 5 8 Plastic Cap Fan Guard xx Not available as an assembly order parts separately 105787 pO RHO AH HSH KH KH BH WO KH HSH BSB BSB Bs ase eB SB ses sep KH HSH KH KB BSB a SB SB SB PO HON H PART NUMBER 098872 04 M50400 NTC 4C 102431 01 M50631 097461 09 101205 01 M30865 02 M11271 8 M50104 02 102431 01 RF3 4B 09851 1 237 M50814 06 M29652 05 108060 03 M10990 3 102861 01 102349 01 104068 04 097702 01 108088 03 M51108 01 NPF 3B 097785 01 WLE 3 079010 39 105793 01 079919 01 079010 40 DESCRIPTION Power Cord Strain Relief Bushing Hex Lock Nut 1 4 20 Screw Lockwasher 1 2 Rubber Bumper Side Cover Motor Bracket Bushing Clip Nut Bushing Screw Lockwasher 1 2 Screw 1110 32 x 1 2 Lower Shell Rubber Airline Fuel Line Fuel Filter Rubber Bushi
13. DITION POSSIBLE CAUSE REMEDY Motor starts and runs but heater does not 1 No fuel in tank 1 Fill tank with kerosene ignite ON OFF switch light remains on 2 Pump pressure incorrect 2 See Pump Pressure Adjustment page 10 3 Dirty fuel filter 3 See Fuel Filter page 8 4 Obstruction in nozzle assembly 4 See Nozzle Assembly page 11 5 Water in fuel tank 5 Drain and flush fuel tank with clean kerosene See Storing Transporting or Shipping page 6 A WARNING High voltage Bad electrical connection between ignitor and ignition control assembly Defective ignitor Defective ignition control assembly 6 Check electrical connections See Wiring Diagram page 25 Replace ignitor see page 9 8 Replace ignition control assembly sJ Heater ignites but ignition control assembly shuts heater off after a short period of time ON OFF switch light remains on aA MO oo Pump pressure incorrect Dirty air intake air output and or lint filter Dirty fuel filter Obstruction in nozzle assembly Photocell assembly not properly installed not seeing the flame See Pump Pressure Adjustment page 10 See Air Output Air Intake and Lint Filters page 10 See Fuel Filter page 8 See Nozzle Assembly page 11 Make sure photocell boot is properly seated in bracket NOR OM B amp B WD A WARNING High voltage Dirty photocell lens Bad electrical con
14. Motor 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 op eration or as needed Clean twice a heating season or as needed No maintenance required Clean every season or as needed Not required permanently lu bricated See Storing Transporting or Ship ping See Air Output Air Intake and Lint Filters page 10 See Air Output Air Intake and Lint Filters page 10 See Fuel Filter page 8 See Fan page 13 A WARNING Never service heater while it is plugged in operating or hot Severe burns and electrical shock can occur ATTENTION The ignition control has built in protection against current overloads Use the light in the ON OFF switch to troubleshoot the fault condition POSSIBLE CAUSE REMEDY Motor does not start five seconds after heater is plugged in ON OFF switch light remains on 1 Bad electrical connection between motor 1 and ignition control assembly or ignition control assembly and power cord Check all electrical connections See Wiring Diagram page 25 WARNING Hig h voltage 2 Binding pump rotor 2 3 Defective ignition control assembly 3 4 Defective motor 4 If fan does not turn freely see Pump Rotor page 12 Replace ignition control assembly Replace motor 105787 TROUBLESHOOTING OWNER S MANUAL Continued FAULT CON
15. 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 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 extinguished and the heater allowed to cool prior to fueling 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 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 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 Fuel storage shall be in accordance with the authority having jurisdiction d e wm g h Never use heater where gasoline paint thinner or other highly flammable vapors are present Follow
16. RRANTY INFORMATION CERTIFICATE OF GENERAL EQUIPMENT LIMITED ONE YEAR WARRANTY NU TOOL warrants new Products sold by it to be free from defects in material or workmanship for a period of one year after date of delivery to the first user and subject to the following conditions NU TOOL s obligation and liability under this Warranty is expressly limited to repairing or replacing at NU TOOL s option any parts which appear to NU TOOL upon inspection to have been defective in material or workmanship when shipped from the factory Such parts shall be provided at no cost to the user atthe business establishment of any factory authorized service center orthe factory during regular working hours The Warranty shall not apply to component parts or accessories of Products not manufactured by NU TOOL and which carry the warranty of the manufacturer thereof or to normal maintenance such as pressure adjustments or to normal maintenance parts such as filters and spark plugs Replacement or repair parts installed in the Product covered by this Warranty are warranted only for the remainder of this Warranty as if such parts were original compo nents of said Product NU TOOL MAKES NO OTHER EX PRESS WARRANTY TO THE EXTENT PERMITTED BY LAW NU TOOL MAKES NO IMPLIED WARRANTY AND MAKES NO WARRANTY OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE IN ANY EVENT IMPLIED WARRANTIES INCLUDING THOSE OF MERCHANTABIL ITY AND FITNESS FOR A PARTICULAR P
17. Rubber Bumper Side Cover Motor Bracket Bushing Clip Nut Bushing Screw Lockwasher 1 2 Screw 1110 32 x 1 2 Lower Shell Rubber Airline Fuel Line Fuel Filter Rubber Bushing Nylon Locknut PCB Support Ignition Control Assembly Fuel Cap Includes Gasket Fuel Tank Shell Heat Shield Nut 4410 32 Vinyl Foam Gasket Lockwasher 10 Wire Assembly Brown White ON OFF Switch Switch Cover Wire Assembly White a Oe a PARTS AVAILABLE NOT SHOWN HA2210 103814 01 104974 01 106013 05 105880 01 Filler Neck Screen Wire Tie Tradename Decal Decal Package Ignition Control Assembly Fuse MOY ia PORTABLE FORCED AIR HEATERS ILLUSTRATED PARTS BREAKDOWN NTH70 2 70 000 BTU HR MODEL Motor and Pump Assembly O 1249 18 105787 OWNER S MANUAL PARTS LIST 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 NTH70 2 and description of the desired part 70 000 BTU HR MODEL PART NUMBER M51104 01 098511 256 M11084 29 102432 01 098512 64 M10908 2 103154 03 M16656 24 LI HA3026 102548 05 104056 01 102336 01 M10908 75 103347 01 102431 01 103684 01 LI 102001 23 079975 02 M22009 M22456 1 M29608 M29632 M29633 M29609 M12461 31 M27694 M10993 1 M22997 M8940 M29612 01 M12461 31 103676 01 M8643 FHPF3 5
18. URPOSE ARE LIMITED TO THE DURATION OF THIS EXPRESS WAR RANTY Any transportation charges costs of installation duty taxes or any other charges whatsoever must be borne by the user NU TOOL s obligation under this limited Warranty shall not include any liability for direct indirect incidental or conse quential damage or delay If requested by NU TOOL products or parts for which a warranty claim is made are to be returned transportation prepaid by user to the factory Any improper use including operation after discovery of defective or worn parts operation beyond capacity substitution of parts not approved by NU TOOL or any alteration or repair by others in such manner as in NU TOOL s judgement affects the Product mate rially and adversely shall void this Warranty NO EMPLOYEE OR REPRESENTATIVE IS AUTHORIZED TO CHANGE THIS WARRANTY IN ANY WAY OR GRANT ANY OTHER WARRANTY UNLESS SUCH CHANGE IS MADE IN WRITING AND SIGNED BY AN OFFICER OF NU TOOL AT ITS HOME OFFICE WARRANTY SERVICE Always specify model and serial numbers when communicating with the factory We reserve the right to amend these specifications at any time without notice The only Warranty applicable is our standard written Warranty We make no other Warranty expressed or implied 105787 01 NOT A UPC 105787 01 Rev D Printed in U S A 12 01
19. al dealer AIR GAUGE KIT HA1180 For all models Special tool to check pump pressure HEAVY DUTY WHEELS AND HANDLE KIT HA1202 For heavy duty applications Makes your heater even more portable and convenient For 35 50 70 000 Btu Hr models d STANDARD WHEELS AND HANDLE KIT HA1206 Makes heater even more portable and con venient Easy to assemble For 35 50 70 000 Btu Hr models IGNITION CONTROL ASSEMBLY PHOTOCELL TESTER HA1170 Special tool used to test the ignition control assembly and photocell 26 105787 OWNER S MANUAL EC CONFORMITY DECLARATION EC CONFORMITY DECLARATION NU TOOL Group Carcroft Industrial Estate Adwick Le Street Doncoster KN6 7DU England Manufacturer DESA International Inc 2701 Industrial Drive Bowling Green KY 42101 U S A Kerosene Portable Forced Air Heaters Model Numbers NTH35 2 NTH50 2 NTH70 2 NTH100 2 NTH150 2 It is declared that these models conform to the Machinery Directive 98 37 EC including 91 368 EEC and the Low Voltage Directive 73 23 EEC It is further declared that these models conform to the EMC Directive 89 336 EEC amended by 92 31 EEC and including EN50081 1 and EN50082 1 We declare that the models noted are in conformity Company DESA International Inc Name Keith Teakell Title Vice President Heating Products Engineering d 06 13 2001 Bowling Green KY CE Date and Place Signature 105787 27 WA
20. ard FUEL FILTER 35 50 70 000 Btu Hr Models 1 7 Remove side cover screws using 5 16 nut driver Remove side cover Pull rubber fuel line off fuel filter neck Carefully pry bushing and fuel filter out of fuel tank Wash fuel filter with clean fuel and re place in tank Attach rubber fuel line to fuel filter neck Replace side cover FUEL FILTER 100 150 000 Btu Hr Models 1 Bo Remove side cover screws using 5 16 nut driver Remove side cover Pull upper fuel line off fuel filter neck Carefully pry bushing lower fuel line and fuel filter out of fuel tank Wash fuel filter with clean fuel and re place in tank Attach upper fuel line to fuel filter neck Replace side cover Upper Shell g Ss Quar Figure 8 Upper Shell Removal 100 70 000 Btu Hr Models 150 000 Btu Hr Models Fuel Filter we Side Cover Fuel Line Figure 9 Fuel Filter Removal 35 50 70 000 Btu Hr Models Fuel Filter Bushing and Lower Fuel Line Upper Fuel Side Cover Figure 10 Fuel Filter Removal 100 150 000 Btu Hr Models 8 105787 SERVICE PROCEDURES Continued IGNITOR 1 Remove upper shell and fan guard see page 8 Remove fan see page 13 Remove 4 side cover screws with a 5 16 nut driver Remove side cover see Figure 9 or 10 page 8 4 Disconnect ignitor wires black from ignition control assembly see Figure 11 Pull the ignitor wires up through
21. art 35 000 BTU HR MODEL PART NUMBER M51104 01 098511 256 M11084 29 102432 01 098512 63 M10908 2 103154 03 M16656 24 ck HA3006 102548 05 104056 01 102336 01 M10908 75 103347 01 102431 01 103684 01 ck 102001 25 079975 03 M22009 M22456 2 M29608 M29632 M29633 M29609 M12461 31 M27694 M10993 1 M22997 M8940 M29612 01 M12461 32 103676 01 M8643 2 FHPF3 6C 105780 01 M51105 01 OONDOARWND DESCRIPTION Handle Upper Shell Screw 10 16 x 3 4 Screw Lockwasher 1 2 Combustion Chamber Screw 6 32 x 3 8 Photocell Bracket Photocell Assembly Burner Strap Assembly Nozzle Assembly Ignitor Kit Nozzle Adapter Nozzle Adapter Bracket Screw 6 32 x 7 8 Belleville Washer Screw Lockwasher 1 2 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 Nylon Elbow 90 Blade Screw 10 32 x 3 4 Plastic Cap Fan Guard Not available as an assembly order parts separately 105787 KEY PART QTY NO NUMBER DESCRIPTION QTY po BHO H HSH KH BH BH WO KH HSH BSB Be Bs se ae Ss SB ep AH HSH KH BSB KSB eB SB SB SV POH OND H SH 098872 04 M50400 NTC 4C 102431 01 M50631 097461 09 101205 01 M30865 02 M11271 8 M50104 02 102431 01 RF3 4B 09851 1 237 M50814 06 M29652 05 108060 01 M10990 3 10
22. ation 2 Fill fuel tank with kerosene or No 1 fuel oil 3 Attach fuel cap Plug power cord of heater into standard 240 volt 50 hertz grounded earthed outlet Use an extension cord if needed Use only a three prong grounded earthed extension cord Combustion Chamber Motor Air Pump Ignitor Air Intake Fan Filter ze m E m lj Clean Pi Cool Heated m f Air Air Out lt m In El NAR _ we Jl Se 3 7 Hi mm Air M Output Filter NP Fuel Nozzle Z Fuel Air Line Ignition Control Tank Filter To Burner Assembly emn Air For Fuel System sl Air For Combustion And Heating m Fuel Figure 4 Cross Section Operational View 105787 EXTENSION CORD WIRE SIZE REQUIREMENTS Up to 30 5 meters 100 feet long use 1 0 mm 16 AWG conductor 30 6 to 61 meters 101 to 200 feet long use 1 5 mm 14 AWG conductor Push ON OFF switch to ON I position and heater should start in 5 seconds If ON OFF switch light does not come on or heater does notstart see Troubleshooting pages 6 and 7 TO STOP HEATER Push ON OFF switch to OFF O position TO RESET HEATER 1 Push ON OFF switch to OFF O posi tion and wait 10 seconds 2 minutes if heater has been running 2 Repeat steps under To Start Heater ON OFF Switch with Light Figu
23. e the fan pitch 1 Remove upper shell see page 8 2 Use 1 8 allen wrench to loosen set screw which holds fan to motor shaft 3 Slip fan off motor shaft Clean fan using a soft cloth moistened 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 28 7 Place setscrew on flat of shaft Tighten setscrew firmly 4 5 to 5 6 N m 40 to 50 in Ibs 8 Replace fan guard and upper shell Setscrew Shaft Figure 27 Fan Motor Shaft and Setscrew Location a Motor Shaft Setscrew Figure 28 Fan Cross Section 105787 OWNER S MANUAL IGNITION CONTROL ASSEMBLY AX WARNING Unplug heater before servicing Remove Old Assembly 1 Using the 5 16 nut driver or socket wrench remove the four side cover screws see Figure 29 2 Disconnect the nine wires from the ignition control assembly 3 Using needle nose pliers squeeze the tab on the printed circuit board support and lift up on the edge of the ignition control assembly see Figure 30 Repeat this for the other four printed circuit board sup ports then remove the assembly Side Cover Figure 29 Removing Cover Side Cover o Ignition Control Printed Circuit Assembly Board Supports 5 Figure 30 Removing Circuit Board Installing the New Assembly A CAUTION Ignition control assemb
24. er Air Intake Filter Filter End Fan Guard f SSSSSSSSSSSSSSNNN Lint Filter Air Output Filter Figure 13 Air Output Air Intake and Lint Filters 35 50 70 000 Btu Hr Models Air Intake Filter Filter End Fan Guard Cover Lint Filter Air Output Filter Figure 14 Air Output Air Intake and Lint Filters 100 150 000 Btu Hr Models Pressure Gauge Plug Smp Pressure Relief Model PSI Bar Valve NTH35 2 2 9 0 200 NTH50 2 3 9 0 270 NTH70 2 4 9 0 338 NTH100 2 4 9 0 338 NTH150 2 5 5 0 380 Plastic Cap Figure 15 Pressure Gauge Plug and Pressure Plastic Cap Removal Gauge 35 50 70 000 Btu Hr Models Shown Figure 16 Adjusting Pump Pressure 10 105787 SERVICE PROCEDURES Continued NOZZLE ASSEMBLY 1 Remove upper shell see page 8 2 Remove fan see page 13 3 Removefuelandairline hoses from nozzle assembly see Figure 17 18 or 19 4 Turn nozzle assembly 1 4 turn to left and pull toward motor to remove see Figure 20 5 Place plastic hex body into vise and lightly tighten 6 Carefully remove nozzle from the nozzle adapter using 5 8 socket wrench see Figure 21 7 Blow compressed air through face of nozzle This will free any dirt in nozzle area 8 Inspect nozzle seal for damage 9 Replace nozzle into nozzle adapter un til nozzle seats Tighten 1 3 turn more using 5 8 socket wrench 4 5 to 5 1 N m 40 to 45 in Ibs See Figure 21
25. g heater Provide a fresh air opening of at least 2800 square cm three square feet for each 30kw 100 000 Btu Hr rating Provide extra fresh air if more heaters are being used Example A 44kw 150 000 Btu Hr heater requires one of the following atwo car garage door 4 9 meter 16 feet opening raised 9 cm 3 5 inches asingle car garage door 2 75 meter 9 feet opening raised 15 25 cm 6 inches two 76 cm 30 inch windows raised 28 cm 11 inches 105787 THEORY OF OPERATION 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 ignition con trol assembly provides power to the ignitor This ignites the fuel air mixture in the com bustion chamber The Flame Out Control System This sys tem causes the heater to shut down if the flame goes out OWNER S MANUAL OPERATION AX WARNING Review and un derstand the warnings in the Safety Information section page 2 They are needed to safely op erate this heater Follow all local codes when using this heater TO START HEATER 1 Follow all ventilation and safety infor m
26. ge 8 If air line hose is damaged dis connect from nozzle adapter see Figure 17 18 or 19 and from barb fitting on pump end cover see Figure 22 Install new air and or fuel line Attach one end of air line hose to barb fitting on pump end cover see Figure 22 and the other end to nozzle adapter see Figure 17 18 or 19 Attach one end of fuel line hose to fuel filter see page 8 and the other end to nozzle adapter see Figure 17 18 or 19 For 35 50 70 000 Btu Hr model heat ers route air and fuel lines approxi mately as shown in Figure 17 Note Hoses are not to be touching pho tocell bracket For 100 000 Btu Hr model heater route air and fuel lines approximately as shown in Figure 18 Note Hoses are not to be touching pho tocell bracket For 150 000 Btu Hr model heater route air and fuel lines approximately as shown in Figure 19 Note Hoses are not to be touching pho tocell bracket Replace side cover Replace upper shell and fan guard see page 8 Pump End Cover Air Hose Figure 22 Air Hose to Barb Fitting Continued MOZDA PORTABLE FORCED AIR HEATERS SERVICE Blade Air Pump Intak PROCEDURES Filter Continued Filter End PUMP ROTOR Procedure if Rotor is Binding 1 Remove upper shell see page 8 Fan Guard 2 Remove filter end cover screws using 5 16 nut driver 3 Remove filter end cover and air filters Rotor Remove pump plate screws using 5 16 Air
27. ged in heater Never attach duct work to front or rear of heater 105787 OWNER S MANUAL PRODUCT UNPACKING IDENTIFICATION 1 Remove all packing items applied to heater for shipment Remove all items from carton Handle 3 Check items for any shipping damage Hot Air Outlet Upper Shell PSS If heater is damaged promptly inform PP ie es dealer where you bought heater Fan Guard FUELS Lower Shell b Air Filter WARNING Useonly kerosene F el Tank ES End Cover or No 1 fueloil to avoid risk of fire genan or explosion Never use gasoline OSs Fuel Cap naphtha paint thinners alcohol Side Cover SS ie or other highly flammable fuels ON OFF Switch R Do not use heavy fuels such as No 2 fuel oil with Light OX or No 2 Diesel Using heavy fuels will Power Cord clogged fuel filter and nozzle result in use of non toxic anti icer in fuel during Figure 1 35 50 70 000 Btu Hr Models very cold weather IMPORTANT Use a KEROSENE ONLY container Besure storage containeris clean Foreign matter such as rust dirt or water will cause the flame out control to shut down heater Foreign matter may also re quire you to clean fuel system often Upper Shell Lower Shell W i Fan Guard E NI Fuel Tank Side Cover TS rm XN zy SM B ON OFF Switch Wm 2 Power Cord with Light Hot Air Outlet Figure 2 100 150 000 Btu Hr Models 105787 3 NUZA
28. ly contains electrostatic components Handle the assem bly by the edges of the printed circuit board Do not touch any of the quick connect terminals or electronic components 1 Align the five holes in the assembly with the five printed circuit board sup ports in the side cover 2 Holding the assembly by the edges ofthe printed circuit board apply downward pressure until all five tabs on the printed circuit board supports springlock into place Pull up on assembly to verify this see Figure 31 3 Connect the nine wire leads to the ig nition control assembly as shown in the wiring diagram on page 25 AX CAUTION Double check connections Connecting igni tion control assembly wrong could result in damage to the ignition control assembly and or other components in the heater assembly 4 Using the 5 16 nut driver or socket wrench reinstall side cover to heater Tighten screws until snug Do not over torque Unacceptable Acceptable Figure 31 Attaching Circuit Board to Tabs MOY ia PORTABLE FORCED AIR HEATERS ILLUSTRATED PARTS BREAKDOWN NTH35 2 35 000 BTU HR MODEL Motor and Pump Assembly O 1249 14 105787 OWNER S MANUAL PARTS LIST 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 NTH35 2 and description of the desired p
29. n White ON OFF Switch Switch Cover Lockwasher 10 Nut 10 32 Edge Liner Wire Assembly White Filler Neck Screen Wire Tie Tradename Decal Decal Package Ignition Control Assembly Fuse 2a E 024242 424 Pasa a Osean An OOD H BA Baa a ow io 2 14 14 pep PARTS AVAILABLE NOT SHOWN Not available as an assembly order parts separately 105787 21 MOY ia PORTABLE FORCED AIR HEATERS ILLUSTRATED PARTS BREAKDOWN NTH150 2 150 000 BTU HR MODEL Motor and Pump Assembly 10 22 105787 OWNER S MANUAL PARTS LIST 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 NTH150 2 desired part 150 000 BTU HR MODEL PART NUMBER 098511 257 102432 01 098512 66 103154 05 M10908 2 M16656 24 100735 24 102548 05 M10908 75 102336 01 104054 01 103347 01 102431 01 102042 01 102001 24 079975 03 FHPF3 6C M22009 M22456 2 M50545 M12179 M16545 M8940 M10993 1 M27694 M22997 M12461 31 M12244 1 M11637 M50820 02 M8643 2 M12461 32 M50631 101206 01 101695 01 104068 04 DESCRIPTION Upper Shell Screw Lockwasher 1 2 Combustion Chamber Photocell Bracket Screw 6 32 x 3 8 Photocell Assembly Burner Strap Assembly Nozzle Assembly Ignitor Kit Screw 6 32 x 7 8 Nozzle Adapter Bracket Nozzle Adapter Belleville Washer Screw
30. nection between photocell and ignition control assembly Defective photocell Defective ignition control assembly 6 Clean photocell lens 7 Check electrical connections See Wiring Diagram page 25 8 Replace photocell 9 Replace ignition control assembly ON OFF switch light does not come on when switch is turned to the ON position and heater does not start No power to heater 1 Verify that power cord is plugged into an electrical outlet and that the circuit breaker in the electral panel is reset A WARNING High voltage Bad electrical connections Electrical short in ignitor 2 Check electrical wiring and connections See Wiring Diagram page 25 3 Check ignitor wiring If no problems are found replace ignitor see page 9 ON OFF switch light comes on when switch is turned to the ON I position but turns off after five seconds 105787 Electrical short in motor 1 Check motor wiring If no problems are found replace motor A WARNING High voltage NUZA PORTABLE FORCED AIR HEATERS SERVICE PROCEDURES AX WARNING Never service heater while it is plugged in op erating or hot Severe burns and electrical shock can occur UPPER SHELL REMOVAL 1 25 3 Remove screws and lock washers along each side of heater using 5 16 nut driver These screws attach upper and lower shells together Lift upper shell off Remove fan gu
31. ng Nylon Locknut PCB Support Ignition Control Assembly Fuel Cap Includes Gasket Fuel Tank Shell Heat Shield Nut 4410 32 Vinyl Foam Gasket Lockwasher 10 Wire Assembly Brown White ON OFF Switch Switch Cover Wire Assembly White a Oe a PARTS AVAILABLE NOT SHOWN HA2210 103814 01 104974 01 106013 02 105880 01 Filler Neck Screen Wire Tie Tradename Decal Decal Package Ignition Control Assembly Fuse MOY ia PORTABLE FORCED AIR HEATERS ILLUSTRATED PARTS BREAKDOWN NTH100 2 100 000 BTU HR MODEL 10 1 10 2 x 10 3 o Oye o ARDT d oQ CA XI 10 177 Paid a Motor and Pump Assembly 10 20 105787 OWNER S MANUAL PARTS LIST 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 NTH100 2 desired part 100 000 BTU HR MODEL PART NUMBER 098511 257 102432 01 098512 65 103971 01 M10908 2 M16656 24 HA3027 102548 05 M10908 75 102336 01 104054 01 103347 01 102431 01 102042 01 102001 24 079975 02 FHPF3 5C M22009 M22456 1 M50545 M12179 M16545 M8940 M10993 1 M27694 M22997 M12461 31 M12244 1 M11637 M50820 02 M8643 M50631 101206 01 101695 01 104068 04 DESCRIPTION Upper Shell Screw Lockwasher 1 2 Combustion Chamber Photocell Bracket Screw 6 32
32. re 5 ON OFF Switch 35 50 70 000 Btu Hr Models ON OFF Switch with Light Figure 6 ON OFF Switch 100 150 000 Btu Hr Models NUZA PORTABLE FORCED AIR HEATERS STORING TRANSPORTING OR SHIPPING Note If shipping transport companies re quire 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 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 dur ing future use 4 Replace fuel cap or drain plug Prop erly 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 TROUBLESHOOTING FAULT CONDITION PREVENTATIVE MAINTENANCE SCHEDULE Item while it Severe occur A WARNING Never service heater is plugged in operating or hot burns and electrical shock can How Often How To Fuel tank Air output and lint filters Air intake filter Fuel filter Ignitor Fan blades
33. x 3 8 Photocell Assembly Burner Strap Assembly Nozzle Assembly Ignitor Kit Screw 6 32 x 7 8 Nozzle Adapter Bracket Nozzle Adapter Belleville Washer Screw Lockwasher 1 2 Fan Motor and Pump Assembly Motor Pump Body Screw 10 32 x 5 8 Rotor Insert Pump Rotor Pump End Cover Intake Filter Filter End Cover Steel Ball 1 4 Diameter Relief Spring Adjusting Screw Plug Screw 10 32 x 1 Output Filter Lint Filter Barb Fitting Blade Rubber Bumper Motor Mounting Bracket Button Plug Ignition Control Assembly KEY PART QTY NO NUMBER DESCRIPTION QTY 1 8 1 1 2 1 1 1 1 1 1 1 1 2 1 1 1 1 2 1 1 1 1 1 1 1 1 1 A o a a po RH SH nma NTC 4C M51114 01 M27417 099213 01 M51345 01 107961 01 M51151 01 M10990 3 M50814 03 09851 1 236 M50104 03 M50104 01 102431 01 M11271 8 RF3 4B 108088 04 097702 01 102349 01 M50400 098872 04 M51077 15 102431 01 102861 01 079010 39 105793 01 079919 01 WLE 3 NPF 3B 097468 01 079010 40 HA2210 103814 01 104998 01 106013 03 105880 01 Hex Lock Nut 1 4 20 Fan Guard Drain Plug Includes o Ring Button Plug Fuel Line Fuel Filter Fuel Line Tube Rubber Bushing Airline Lower Shell Bushing Bushing Screw Lockwasher 1 2 Clip Nut Screw 10 32 x 1 2 Fuel Tank Fuel Cap Includes Gasket P C Board Support Strain Relief Bushing Power Cord Side Cover Screw Lockwasher 1 2 Nylon Locknut Wire Assembly Brow

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