PORTABLE FORCED AIR HEATERS OWNER’S MANUAL Models: D20N, D30N, and D44N 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.
D20N, D30N AND D44N MODELS PORTABLE FORCED AIR HEATERS SAFETY INFORMATION WARNINGS 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.
OWNER’S MANUAL PRODUCT IDENTIFICATION UNPACKING 1. 2. 3. Hot Air Outlet Upper Shell Fan Guard Air Filter End Cover Lower Shell Fuel Tank Fuel Cap Power Cord Figure 1 - D20N Model FUELS 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.
D20N, D30N AND D44N MODELS PORTABLE FORCED AIR HEATERS D20N Model ASSEMBLY These models are furnished with wheels and handles. Wheels, handles, and the mounting hardware are found in the shipping carton. Sleeve Cap Hot Air Outlet • Medium Phillips Screwdriver • 3/8" Open or Adjustable Wrench • Hammer 2. 3. 4. 5. 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).
OWNER’S MANUAL THEORY OF OPERATION OPERATION Extension Cord Wire Size Requirements WARNING: Review and understand the warnings in the Safety Information section, page 2. They are needed to safely operate this heater. Follow all local codes when using this heater. 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.
D20N, D30N AND D44N MODELS PORTABLE FORCED AIR HEATERS STORING, TRANSPORTING, OR SHIPPING Note: If shipping, transport companies require 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. 2. Replace drain plug if provided. 3.
OWNER’S MANUAL TROUBLESHOOTING Continued FAULT CONDITION POSSIBLE CAUSE REMEDY Motor starts and runs but heater does not ignite (ON/OFF switch light remains on) 1. 2. 3. 4. 5. 1. 2. 3. 4. 5. No fuel in tank Pump pressure incorrect Dirty fuel filter Obstruction in nozzle assembly Water in fuel tank Fill tank with kerosene See Pump Pressure Adjustment, page 10 See Fuel Filter, page 8 See Nozzle Assembly, page 11 Drain and flush fuel tank with clean kerosene.
D20N, D30N AND D44N MODELS PORTABLE FORCED AIR HEATERS Upper Shell SERVICE PROCEDURES Upper Shell Fan Guard WARNING: Never service heater while it is plugged in, operating, or hot. Severe burns and electrical shock can occur. Fan Guard UPPER SHELL REMOVAL 1. 2. 3. Remove screws and lock washers along each side of heater using 5/16" nutdriver. These screws attach upper and lower shells together. Lift upper shell off. Remove fan guard.
OWNER’S MANUAL SERVICE PROCEDURES 6. Continued IGNITOR 1. 2. 3. 4. 5. 7. 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). Disconnect ignitor wires (gray) from ignition control assembly (see Figure 11). Pull the ignitor wires up through the hole in the lower shell. Disconnect fuel line hose and air line hose. Remove photocell from photocell bracket (see Figure 11).
D20N, D30N AND D44N MODELS PORTABLE FORCED AIR HEATERS Air Intake Filter SERVICE PROCEDURES Filter End Cover Continued Fan Guard AIR OUTPUT, AIR INTAKE, AND LINT FILTERS 1. 2. 3. 4. 5. 6. 7. Remove upper shell (see page 8). Remove filter end cover screws using 5/16" nut-driver. Remove filter end cover. Replace air output and lint filters. Wash or replace air intake filter (see Preventative Maintenance Schedule, page 6). Replace filter end cover. Replace fan guard and upper shell.
OWNER’S MANUAL Combustion Chamber SERVICE PROCEDURES Burner Strap Continued NOZZLE ASSEMBLY 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. FUEL AND AIR LINE REPLACEMENT AND PROPER ROUTING Remove upper shell (see page 8). Remove fan (see page 13). Remove fuel and air line hoses from nozzle assembly (see Figure 17, 18, or 19). Turn nozzle assembly 1/4 turn to left and pull toward motor to remove (see Figure 20). Place plastic hex-body into vise and lightly tighten.
D20N, D30N AND D44N MODELS PORTABLE FORCED AIR HEATERS Blade Pump Plate SERVICE PROCEDURES Air Intake Filter Continued PUMP ROTOR Filter End Cover (Procedure if Rotor is Binding) 1. 2. 3. 4. 5. 6. 7. 8. 9. Remove upper shell (see page 8). Remove filter end cover screws using 5/16" nut-driver. Remove filter end cover and air filters. Remove pump plate screws using 5/16" nut-driver. Remove pump plate. Remove rotor, insert, and blades. Check for debris in pump.
OWNER’S MANUAL IGNITION CONTROL ASSEMBLY SERVICE PROCEDURES Continued Installing the New Assembly CAUTION: Ignition control assembly contains electrostatic components. Handle the assembly by the edges of the printed circuit board. Do not touch any of the quick connect terminals or electronic components. WARNING: Unplug heater before servicing. 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.
D20N, D30N AND D44N MODELS PORTABLE FORCED AIR HEATERS ILLUSTRATED PARTS BREAKDOWN 4 2 5 D20N MODEL 9-1 9-2 9-6 9-5 9 7 6 11 9-4 9-3 8 21 10 12 18 26 13 20 22 16 23 24 37 28 39 30 27 29 38 25 35 34 12-1 31 19 12-2 17 12-3 15 12-4 14 12-5 33 32 36 1 12-6 12-18 12-17 12-16 3 40 12-7 12-8 12-9 12-15 12-13 12-14 12-10 Motor and Pump Assembly 12-19 12-12 14 12-11 105843
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 desired part. D20N MODEL KEY NO.
D20N, D30N AND D44N MODELS PORTABLE FORCED AIR HEATERS ILLUSTRATED PARTS BREAKDOWN 2 1 7-1 7-2 D30N MODEL 7-6 7-3 3 7-4 7-5 9 7 10 5 4 16 6 8 11 19 23 24 12 28 15 25 18 26 20 27 22 29 21 41 30 42 31 37 43 10-1 13 35 33 10-2 17 36 10-4 34 14 10-3 10-5 44 39 32 38 10-6 10-17 40 14 10-7 10-8 10-16 10-15 10-13 10-9 10-14 10-10 10-13 Motor and Pump Assembly 10-11 10-12 16 105843
OWNER’S MANUAL PARTS LIST D30N MODEL 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 NO.
D20N, D30N AND D44N MODELS PORTABLE FORCED AIR HEATERS ILLUSTRATED PARTS BREAKDOWN 2 1 7-1 7-2 D44N MODEL 7-6 7-3 3 7-4 7-5 9 7 10 5 4 16 6 8 11 19 23 24 12 28 15 25 18 26 20 27 22 29 21 41 30 42 31 37 43 10-1 13 35 33 10-2 17 36 10-4 34 14 10-3 10-5 44 39 32 38 10-6 10-17 40 14 10-7 10-8 10-16 10-15 10-18 10-9 10-14 10-10 10-13 Motor and Pump Assembly 10-11 10-12 18 105843
OWNER’S MANUAL PARTS LIST D44N Model 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 NO.
D20N, D30N AND D44N MODELS PORTABLE FORCED AIR HEATERS WHEELS AND HANDLES 2 1 8 2 1 D30N and D44N Models D20N Model 7 3 5 4 5 6 4 7 3 KEY PART NO.
OWNER’S MANUAL SPECIFICATIONS ACCESSORIES Output Rating (Btu/Hr) 70,000 110,000 Fuel Use Only Kerosene or No. 1 Fuel Oil Purchase accessories from your local dealer. 150,000 Fuel Tank Capacity (U.S. Gal./Liters) 5.0/18.9 9.0/34 13.5/51.1 (Gal. Per Hr./Liters Per Hr.) .52/1.97 .79/3.0 1.1/4.1 Electric Requirements 230 V/50 Hz (Same All Models) Amperage (Normal Run) 1.0 1.2 1.2 Hot Air Output (CFM/CMM) 225/6.4 425/12 500/14.
D20N, D30N AND D44N MODELS PORTABLE FORCED AIR HEATERS EC CONFORMITY DECLARATION EC CONFORMITY DECLARATION DESA Europe B.V. Innsbruckweg 144, 3047 AH Postbus 11158 3004 ED Rotterdam Holland Manufacturer: DESA International, Inc. 2701 Industrial Drive Bowling Green, KY 42101 U.S.A. Kerosene Portable Forced Air Heaters Model Numbers: D20N, D30N, and D44N 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.
OWNER’S MANUAL NOTES _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ ___________
WARRANTY INFORMATION CERTIFICATE OF GENERAL EQUIPMENT - LIMITED ONE YEAR WARRANTY DESA International 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: DESA International's obligation and liability under this Warranty is expressly limited to repairing or replacing at DESA International's option, any parts which appear to DESA International upon inspection to have been d
