PORTABLE FORCED AIR HEATERS OWNER’S MANUAL 100 SIDE FRONT HANDLES PFA/PV 003 150 SIDE FRONT HANDLE PFA/PV 007 Heater Sizes: 35,000 50,000 55,000 70,000 100,000 110,000 150,000 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 SECTION PAGE Safety Information ......................................................................... 2 Product Identification .................................................................... 4 Unpacking ..................................................................................... 5 Assembly ....................................................................................... 5 Theory of Operation ...................................................................... 6 Fuels ..
SAFETY INFORMATION Continued WARNINGS (Continued) • 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. • Fueling a) Personnel involved with fueling shall be qualified and thoroughly familiar with the manufacturer's instructions and applicable federal, state, and local regulations regarding the safe fueling of heating units. b) Only the type of fuel specified on the heater's data plate shall be used.
PRODUCT IDENTIFICATION Hot Air Outlet Handle Upper Shell Fan Guard Lower Shell Air Filter End Cover Fuel Tank Fuel Cap Side Cover Flame-Out Control Reset Button Power Cord 35/50/70,000 BTU/HR DOMESTIC PFA/PV 042 Figure 1 - 35/50/55/70,000 BTU/Hr Models Hot Air Outlet Upper Shell Lower Shell Fuel Cap Fan Guard Fuel Tank Side Cover 100,000 BTU/HR DOMESTIC Flame-Out Control Reset PFA/PV 043 Button Power Cord Figure 2 - 100/110/150,000 BTU/Hr Models 4 099176
UNPACKING ASSEMBLY (For 100,000, 110,000, and 150,000 BTU/Hr Models Only) 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. These models are furnished with wheels and a front handle. Some models are furnished with a rear handle also. Wheels, handle(s), and the mounting hardware are found in the shipping carton.
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 electronic ignitor sends voltage to the spark plug.
VENTILATION ! WARNING 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 three-square-foot opening of fresh, outside air for each 100,000 BTU/Hr rating. Provide extra fresh air if more heaters are being used.
OPERATION Continued To Stop Heater 1. Unplug extension cord from outlet. To Restart Heater 1. Wait two minutes after stopping heater. 2. Repeat steps under To Start Heater, page 7. STORAGE 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 used. 3. Add one gallon of clean kerosene to fuel tank. 4.
TROUBLESHOOTING ! WARNING Never service heater while it is plugged in, operating, or hot. Severe burns and electrical shock can occur. OBSERVED FAULT Heater ignites, but flame-out control shuts off heater after a short period of time. Heater will not ignite, but motor runs for a short period of time. ! POSSIBLE CAUSE Wrong pump pressure REMEDY See Pump Pressure Adjustment, page 11. Dirty air output, air intake and lint filters See Air Output, Air Intake and Lint Filters, page 10.
SERVICE PROCEDURES ! WARNING Never service heater while it is plugged in, operating, or hot. Severe burns and electrical shock can occur. Upper Shell Upper Shell Removal Fan Guard 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.
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 7). 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 at right for correct pressure for each model. 5. Remove pressure gauge. Replace pressure gauge plug in filter end cover.
11.Tighten spark plug with spark plug mounting nut. 12.Release hex-body of spark plug from vise. 13.Replace burner strap onto combustion chamber. 14.Attach spark plug wire to spark plug. 15.Attach fuel and air line hoses to nozzle assembly. 16.Replace fan (see page 10). 17.Replace fan guard and upper shell. Spark Plug Burner Strap 45° Figure 19 - Spark Plug Rotation, 35/50/55,000 BTU/Hr Models Only Burner Head Spark Plug Wire (70/100/110/150,000 BTU/Hr Models) 1. Remove upper shell (see page 10). 2.
Nozzle (70/100/110/150,000 BTU/Hr Models) 1. Remove upper shell (see page 10). 2. Remove fan (see page 10). 3. Remove fuel and air line hoses from burner head. 4. Remove spark plug wire from spark plug. 5. Remove spark plug from burner head using 13/16" open-end wrench. 6. Remove three (3) screws using 5/16" nut-driver and remove burner head from combustion chamber. 7. Place burner head into vise and lightly tighten. 8. Carefully remove nozzle from burner head using 5/8" socket wrench (see Figure 26). 9.
Gap Adjusting Screw (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 11). .003"/.004" Gap Measured With Feeler Gauge Sandpaper Note: If rotor is still binding, proceed as follows. 13.Perform steps 1 through 6 (see page 13). 14.Place fine grade sandpaper (600 grit) on flat surface. Sand rotor lightly in “figure 8” motion four times (see Figure 30). 15.Reinstall insert and rotor. 16.
MAINTENANCE KITS 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. Parts Centrals are listed in the Authorized Service Center booklet supplied with heater. DESA International P.O. Box 90004 Bowling Green, KY 42102-9004 1-800-972-7879 Parts Department BTU/Hr Flame-Out Control Part No. Spark Plug Part No. Filter Kit Part No. Nozzle Kit Part No.
WARRANTY AND REPAIR SERVICE LIMITED WARRANTY DESA International warrants this product and any parts thereof, 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.
