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PORTABLE
FORCED
AIR HEATERS
OWNER’S MANUAL
Heater Sizes: 35,000 50,000 70,000
100,000 150,000 Btu/Hr
Models: NTH35, NTH50, NTH70, NTH100, and NTH150
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.
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PORTABLE FORCED AIR HEATERS e) At no time shall more than one day's • When moving or storing heater, keep SAFETY supply of heater fuel be stored inside heater in a level position or fuel spillage INFORMATION a building in the vicinity of the heater. may occur. Bulk fuel storage shall be outside the • Keep children and animals away from WARNINGS structure. heater. f) All fuel storage shall be located a • Unplug heater when not in use. IMPORTANT: Read this Owner’s minimum of 762cm (25 feet) from •
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OWNER’S MANUAL PRODUCT UNPACKING 1. Remove all packing items applied to IDENTIFICATION heater for shipment. 2. Remove all items from carton. 3. Check items for any shipping damage. Hot Air Outlet Handle If heater is damaged, promptly inform Upper Shell dealer where you bought heater. Fan Guard FUELS Lower Shell Air Filter WARNING: Use only kerosene End Cover or No. 1 fuel oil to avoid risk of fire Fuel Tank or explosion. Never use gasoline, Fuel Cap naphtha, paint thinners, alcohol or other highl
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PORTABLE FORCED AIR HEATERS 2. Place cap nuts on axle ends. Gently tap ASSEMBLY VENTILATION with hammer to secure. (FOR 100,000 AND 150,000 3. Place heater on wheel support frame. WARNING: Follow the mini- Make sure air inlet end (rear) of heater BTU/HR MODELS ONLY) mum fresh, outside air ventilation is over wheels. Line up holes on fuel requirements. If proper fresh, out- These models are furnished with wheels and tank flange with holes on wheel sup- side air ventilation is not provided, handle
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OWNER’S MANUAL EXTENSION CORD WIRE THEORY OF OPERATION SIZE REQUIREMENTS OPERATION WARNING: Review and un- Up to 30.5 meters (100 feet) long, use 1.0 derstand the warnings in the 2 The Fuel System: The air pump forces mm (16 AWG) conductor Safety Information Section. They air through the air line. The air is then 30.6 to 61 meters (101 to 200 feet) long, use are needed to safely operate this pushed through the burner head nozzle. This 2 1.5 mm (14 AWG) conductor heater. Follow all local code
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PORTABLE FORCED AIR HEATERS STORING, PREVENTATIVE WARNING: Never service heater while it is plugged in, operating, or hot. TRANSPORTING, MAINTENANCE Severe burns and electrical shock can OR SHIPPING SCHEDULE occur. Note: If shipping, transport companies re- quire fuel tanks to be empty. Item How Often How To 1. Drain fuel tank. Fuel tank Flush every 150-200 hours of See Storing, Transporting, or Ship- Note: Some models have drain plug on operation or as needed. ping. underside of fuel tank. If
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OWNER’S MANUAL TROUBLESHOOTING WARNING: Never service heater while it is plugged in, operating, or hot. Severe burns and electrical shock can occur. OBSERVED FAULT POSSIBLE CAUSE REMEDY Heater ignites, but flame-out control shuts 1. Wrong pump pressure 1. See Pump Pressure Adjustment, page 10. off heater after a short period of time. 2. Dirty air output, air intake, and lint filters 2. See Air Output, Air Intake and Lint Filters, page 10. 3. Dirty fuel filter 3. See Fuel Filter, page 8. 4. Dirt i
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PORTABLE FORCED AIR HEATERS Upper Shell Upper SERVICE Shell Fan PROCEDURES Guard WARNING: Never service heater while it is plugged in, op- erating, or hot. Severe burns and electrical shock can occur. Fan Upper Shell Removal Guard 1. Remove screws and lock washers along each side of heater using 5/16" nut- driver. These screws attach upper and lower shells together. Figure 7 - Upper Shell Removal, 35/50/ Figure 8 - Upper Shell Removal, 100/ 2. Lift upper shell off. 70,000 Btu/Hr Models 150,000
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OWNER’S MANUAL Spark Plug Spark Plug SERVICE Mounting Nut Combustion (50/70/100/150,000 Btu/Hr Models) Chamber PROCEDURES Burner Strap 1. Remove upper shell (see page 8). Continued 2. Remove fan (see page 13). Spark Plug Spark Plug 3. Remove spark plug wire from spark plug. Spark (35,000 Btu/Hr Model) 4. Remove spark plug from burner head Plug 1. Remove upper shell (see page 8). using 13/16" open-end wrench. Wire 2. Remove fan (see page 13). 5. Clean and regap spark plug electrodes as follows: 3
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PORTABLE FORCED AIR HEATERS Air Intake Filter SERVICE PROCEDURES Filter End Fan Guard Continued Cover Air Output, Air Intake, and Lint Filters 1. Remove upper shell (see page 8). 2. Remove filter end cover screws using Lint Filter 5/16" nut-driver. Air Output 3. Remove filter end cover. Filter 4. Replace air output and lint filters. 5. Wash or replace air intake filter (see Preventative Maintenance Schedule, page 6). Figure 16 - Air Output, Air Intake, and Lint Filters, 35/50/70,000 Btu/Hr Models 6.
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OWNER’S MANUAL 10. Inspect nozzle seal for damage. SERVICE Burner 11. Replace nozzle into burner head and Strap PROCEDURES tighten firmly (9.1-12.4 n-m/80-110 Continued inch-pounds). 12. Attach burner head to combustion Nozzle chamber. (35,000 Btu/Hr Model) Nozzle 13. Install spark plug in burner head. Assembly 1. Remove upper shell (see page 8). 14. Attach spark plug wire to spark plug. 2. Remove fan (see page 13). 15. Attach fuel and airline hoses to burner 3. Remove fuel and air line hoses fro
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PORTABLE FORCED AIR HEATERS Blade Air SERVICE Pump Intake Plate PROCEDURES Filter Continued Filter End Cover Pump Rotor (Procedure if Rotor is Binding) Fan Guard 1. Remove upper shell (see page 8). 2. Remove filter end cover screws using Insert 5/16" nut-driver. Rotor 3. Remove filter end cover and air filters. Air Output 4. Remove pump plate screws using 5/16" Filter nut-driver. 5. Remove pump plate. Figure 25 - Rotor Location, 35/50/70,000 Btu/Hr Models 6. Remove rotor, insert, and blades. 7. Che
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OWNER’S MANUAL SERVICE SPECIFICATIONS Output Rating (Btu/Hr) 35,000 50,000 70,000 100,000 150,000 PROCEDURES Continued Fuel Use Only Kerosene or No. 1 Fuel Oil Fuel Tank Capacity Fan (U.S. Gal./Liters) 3.0/11.4 5.0/18.9 5.0/18.9 9.0/34 13.5/51.1 IMPORTANT: Remove fan from motor Fuel Consumption shaft before removing motor from heater. (Gal. Per Hr./ The weight of the motor resting on the fan Liters Per Hr.) .26/1.0 .37/1.40 .49/1.85 .70/2.7 1.1/4.1 could damage the fan pitch. Electric Requiremen
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PORTABLE FORCED AIR HEATERS 3 ILLUSTRATED 1 PARTS BREAKDOWN 2 NTH35 4 35,000 BTU/HR MODEL 11-5 11-1 5 11-2 6 11 8 7 9 11-4 15 11-3 13 22 18 13 16 23 17 19 20 24 22 21 21 33 34 39 27 31 41 43 25 29 26 42 30 37 28 12 35 32 36 18-1 18-2 18-18 18-4 18-5 22 18-6 14 10 38 18-7 18-3 40 18-8 18-17 45 46 18-16 44 18-9 18-15 18-10 18-11 18-14 Motor and Pump Assembly 18-12 18-13 104976 14
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OWNER’S MANUAL This list contains replaceable parts used in your heater. When ordering parts, be sure to PARTS LIST provide the correct model and serial numbers (from the model plate), then the part number NTH35 and description of the desired part. 35,000 BTU/HR MODEL KEY PART PART KEY PART PART NO. NUMBER DESCRIPTION QTY. NO. NUMBER DESCRIPTION QTY. 19 M51105-01 Fan Guard 1 1 M51104-01 Handle 1 2 098511-231 Upper Shell 1 20 NTC-4C Hex locknut 2 3 102432-01 Screw/Lockwasher, 1/2" 6 21 M50104-02
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PORTABLE FORCED AIR HEATERS 3 ILLUSTRATED 1 PARTS BREAKDOWN 2 NTH50 4 50,000 BTU/HR MODEL 5 10 7 6 14 8 12 11 12 18 15 19 Burner Head Assembly 23 17 24 10-1 20 21 10-2 10-4 10-5 21 11 35 10-3 36 41 43 29 10-7 45 27 31 28 32 44 33 10-6 38 30 39 22 18-19 18-1 37 18-2 34 18-18 18-4 40 18-5 18-6 11 13 9 18-7 18-3 18-8 18-17 42 25 26 18-16 18-9 16 18-15 18-10 18-11 18-14 18-12 Motor and Pump Assembly 18-13 104976 16
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OWNER’S MANUAL This list contains replaceable parts used in your heater. When ordering parts, be sure to PARTS LIST provide the correct model and serial numbers (from the model plate), then the part number NTH50 and description of the desired part. 50,000 BTU/HR MODEL KEY PART PART KEY PART PART NO. NUMBER DESCRIPTION QTY. NO. NUMBER DESCRIPTION QTY. 18-16 M50016 Elbow, 90˚ (Barb Fitting) 1 1 M51104-01 Handle 1 18-17 M8643 Blade 4 2 098511-231 Upper Shell 1 18-18 FHPF3-5C Screw, #10-32 x 5/8" 2
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PORTABLE FORCED AIR HEATERS 3 ILLUSTRATED 1 PARTS BREAKDOWN 2 4 NTH70 70,000 BTU/HR MODEL 5 10 7 6 14 8 12 11 12 18 15 Burner Head Assembly 19 23 17 24 10-1 20 21 10-2 10-4 10-5 21 11 35 10-3 36 41 43 29 10-7 45 27 31 28 32 44 33 10-6 38 30 39 22 18-19 37 18-1 34 18-2 18-18 40 18-4 18-5 11 13 18-6 9 18-7 18-3 42 25 26 18-8 18-17 16 18-16 18-9 18-15 18-10 18-11 18-14 18-12 Motor and Pump Assembly 18-13 104976 18
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OWNER’S MANUAL This list contains replaceable parts used in your heater. When ordering parts, be sure to PARTS LIST provide the correct model and serial numbers (from the model plate), then the part number NTH70 and description of the desired part. 70,000 BTU/HR MODEL KEY PART PART KEY PART PART NO. NUMBER DESCRIPTION QTY. NO. NUMBER DESCRIPTION QTY. 18-16 M50016 Elbow, 90˚ (Barb Fitting) 1 1 M51104-01 Handle 1 18-17 M8643 Blade 4 2 098511-231 Upper Shell 1 18-18 FHPF3-5C Screw, #10-32 x 5/8" 2
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PORTABLE FORCED AIR HEATERS 2 ILLUSTRATED PARTS BREAKDOWN 1 NTH100 3 100,000 BTU/HR MODEL 4 5 8 12 13 14 7 8-1 9 15 8-2 10 17 11 8-4 8-5 30 31 8-3 20 21 25 26 28 8-7 27 23 9 22 24 33 36 18 34 8-6 19 44 35 Burner Head Assembly 32 37 13-19 38 29 39 16 13-1 43 13-3 13-2 42 40 13-4 9 41 13-5 13-6 6 13-7 46 47 13-18 45 13-8 13-17 13-16 13-9 13-10 13-15 13-14 13-11 13-13 13-12 Motor and Pump Assembly 104976 20
