Page 2 - PORTABLE FORCED AIR HEATERS; WARNINGS; DANGER: Carbon monoxide
2 104976 PORTABLE FORCED AIR HEATERS SAFETYINFORMATION WARNINGS IMPORTANT: Read this Owner’sManual carefully and completelybefore trying to assemble, oper-ate, or service this heater. Im-proper use of this heater cancause serious injury or death fromburns, fire, explosion, electricalshock, and carbo...
Page 3 - OWNER’S MANUAL; UNPACKING; WARNING: Use only kerosene
3 104976 OWNER’S MANUAL Side Cover LowerShell Fuel Cap Hot Air Outlet Upper Shell Flame-OutControl ResetButton Power Cord Fuel Tank Fan Guard Lower Shell Side Cover Fuel Tank Upper Shell Hot Air Outlet Handle Fan Guard Air FilterEnd Cover Fuel Cap PowerCord Flame-Out ControlReset Button ON/OFF Switc...
Page 4 - ASSEMBLY; Tools Needed; VENTILATION
4 104976 PORTABLE FORCED AIR HEATERS Screw WheelSupportFrame Wheel Cap Nut Nut ExtendedHub Front Handle Axle RearHandle AirInlet Fuel TankFlange Hot AirOutlet ASSEMBLY (FOR 100,000 AND 150,000BTU/HR MODELS ONLY) These models are furnished with wheels andhandles. Wheels, handles, and the mountinghard...
Page 5 - OPERATION; TO START HEATER
5 104976 OWNER’S MANUAL OPERATION WARNING: Review and un- derstand the warnings in theSafety Information Section. Theyare needed to safely operate thisheater. Follow all local codeswhen using this heater. TO START HEATER 1. Follow all ventilation and safety infor-mation. 2. Fill fuel tank with keros...
Page 6 - How To; WARNING: Never service heater; Item
6 104976 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, removedrain plug to drain all fuel. If heaterdoes not have drain plug...
Page 7 - TROUBLESHOOTING; WARNING: Never service heater while it is plugged in, operating, or; REMEDY; OBSERVED FAULT
7 104976 OWNER’S MANUAL TROUBLESHOOTING WARNING: Never service heater while it is plugged in, operating, or hot. Severe burns and electrical shock can occur. REMEDY 1. See Pump Pressure Adjustment, page 10.2. See Air Output, Air Intake and Lint Filters, page 10. 3. See Fuel Filter, page 8.4. See Noz...
Page 8 - Upper Shell Removal; Fuel Filter; WARNING: Never service
8 104976 PORTABLE FORCED AIR HEATERS Figure 9 - Fuel Filter Removal, 35/50/70,000 Btu/Hr Models Upper Shell Removal 1. Remove screws and lock washers alongeach side of heater using 5/16" nut-driver. These screws attach upper andlower shells together. 2. Lift upper shell off. 3. Remove fan guard....
Page 9 - Continued; Spark Plug
9 104976 OWNER’S MANUAL Spark Plug (35,000 Btu/Hr Model) 1. Remove upper shell (see page 8). 2. Remove fan (see page 13). 3. Remove fuel and air line hoses fromnozzle assembly. 4. Remove spark plug wire from spark plug. 5. Remove two screws using 5/16" nut-driver and remove burner strap. 6. Plac...
Page 10 - Pump Pressure Adjustment
10 104976 PORTABLE FORCED AIR HEATERS Air Output, Air Intake, and LintFilters 1. Remove upper shell (see page 8). 2. Remove filter end cover screws using5/16" nut-driver. 3. Remove filter end cover. 4. Replace air output and lint filters. 5. Wash or replace air intake filter (seePreventative Mai...
Page 11 - Nozzle
11 104976 OWNER’S MANUAL Nozzle (35,000 Btu/Hr Model) 1. Remove upper shell (see page 8). 2. Remove fan (see page 13). 3. Remove fuel and air line hoses fromnozzle assembly. 4. Turn nozzle assembly 1/4 turn to leftand pull toward motor to remove. 5. Place plastic hex-body into vise andlightly tighte...
Page 12 - Pump Rotor
12 104976 PORTABLE FORCED AIR HEATERS Pump Rotor (Procedure if Rotor is Binding) 1. Remove upper shell (see page 8). 2. Remove filter end cover screws using5/16" nut-driver. 3. Remove filter end cover and air filters. 4. Remove pump plate screws using 5/16"nut-driver. 5. Remove pump plate. 6...
Page 13 - SPECIFICATIONS; WIRING DIAGRAMS
13 104976 OWNER’S MANUAL Fan IMPORTANT: Remove fan from motor shaft before removing motor from heater.The weight of the motor resting on the fancould damage 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...
Page 14 - Motor and Pump Assembly
14 104976 PORTABLE FORCED AIR HEATERS 1 2 3 4 5 6 7 8 9 11 22 13 13 15 16 17 18 19 20 21 22 39 43 23 24 26 27 28 29 30 31 32 35 36 37 38 22 14 10 11-1 11-2 11-3 11-4 11-5 33 34 40 41 42 21 46 45 44 25 12 18-1 18-2 18-18 18-4 18-5 18-6 18-7 18-8 18-9 18-10 18-11 18-12 18-13 18-14 18-15 18-16 18-17 18...
Page 15 - PARTS LIST
15 104976 OWNER’S MANUAL KEY PART PART NO. NUMBER DESCRIPTION QTY. 1 M51104-01 Handle 1 2 098511-231 Upper Shell 1 3 102432-01 Screw/Lockwasher, 1/2" 6 4 098512-43 Combustion Chamber 1 5 M51108-01 Heat Shield 1 6 M11084-29 Screw, #10-16 x 3/4" 2 7 M16660 Photocell Bracket 1 8 M10908-2 Screw,...
Page 16 - Burner Head Assembly
16 104976 PORTABLE FORCED AIR HEATERS ILLUSTRATEDPARTSBREAKDOWN NTH5050,000 BTU/HR MODEL 10-6 10-3 10-2 10-4 10-5 10-7 Burner Head Assembly 10-1 18-1 18-2 18-18 18-4 18-5 18-6 18-7 18-8 18-9 18-10 18-11 18-12 18-13 18-14 18-15 18-16 18-17 18-3 Motor and Pump Assembly 1 2 4 3 5 6 7 8 10 11 12 12 14 1...
Page 24 - ACCESSORIES; KEY PART
24 104976 PORTABLE FORCED AIR HEATERS ACCESSORIES Purchase accessories from your local dealer. HEAVY DUTY WHEELS ANDHANDLE KIT - HA1202 For heavy duty applications. Makes yourheater even more portable and convenient.For 35/50/70,000 Btu/Hr models. AIR GAUGE KIT - HA1180 For all models. Special tool ...
Page 25 - EC CONFORMITY DECLARATION
25 104976 OWNER’S MANUAL 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, NTH50, NTH70...
Page 26 - WARRANTY INFORMATION; CERTIFICATE OF GENERAL
WARRANTY INFORMATION WARRANTIES INCLUDING THOSE OF MERCHANTABIL-ITY AND FITNESS FOR A PARTICULAR PURPOSE ARELIMITED 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 theuser. NU-TOOL's obligation...