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PORTABLE
FORCED
AIR HEATERS
OWNER’S MANUAL
Heater Models:
B50G and REM50B
IMPORTANT
Read and understand this manual before assembling, starting, or servic-
ing heater. Improper use of heater can cause serious injury. Keep this
manual for future reference.
®
G 004
ARL LOGO
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SECTION PAGE CONTENTS Safety Information......................................................................... 2 Product Identification .................................................................... 4 Unpacking ..................................................................................... 4 Theory of Operation ...................................................................... 4 Fuels ..............................................................................................
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SAFETY WARNINGS (Continued) • Use only kerosene or No. 1 fuel oil to avoid risk of fire or explosion. Never use INFORMATION gasoline, naphtha, paint thinners, alcohol, or other highly flammable fuels. Continued • Fueling a) Personnel involved with fueling shall be qualified and thoroughly familiar with the manufacturer's instructions and applicable federal, state, and local regula- tions regarding the safe fueling of heating units. b) Only the type of fuel specified on the heater's data plate shal
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PRODUCT Hot Air Outlet Handle IDENTIFICATION 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 - Models B50G and REM50B 1. Remove all packing items applied to heater for shipment. UNPACKING 2. Remove all items from carton. 3. Check items for shipping damage. If heater is damaged, promptly inform dealer where you bought heater. The Fuel System: The air pump forces air thr
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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. Using heavy fuels will result in: • clogged fuel filter and nozzle • carbon build up on spark plug • the need of non-toxic anti-icer in fuel during very cold weather IMPORTANT: Use a KEROSENE ONLY storage container. Be sure storage container is clean. Foreign matte
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OPERATION ! WARNING Review and understand the warnings in the Safety Information Section, pages 2 and 3. They are needed to safely operate this heater. Follow all local codes when using this heater. To Start Heater 1. Follow all ventilation and safety information. 2. Fill fuel tank with kerosene or No. 1 fuel oil. 3. Attach fuel cap. 4. Plug power cord of heater into three-prong, grounded extension cord. Exten- sion cord must be at least six feet long. Extension Cord Wire Size Requirements 6 to
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Note: If shipping, transport companies require fuel tanks to be empty. STORING, 1. Drain fuel tank. TRANSPORTING, 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 OR SHIPPING through fuel cap opening. Be sure all fuel is removed. 2. 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
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TROUBLE- ! WARNING SHOOTING Never service heater while it is plugged in, operating, or hot. Severe burns and electrical shock can occur. OBSERVED FAULT POSSIBLE CAUSE REMEDY Wrong pump pressure See Pump Pressure Heater ignites, but flame-out control Adjustment, page 10. shuts off heater after Dirty air output, air intake See Air Output, Air Intake a short period of and lint filters and Lint Filters, page 9. time. Dirty fuel filter See Fuel Filter, page 10. Dirt in nozzle See Nozzle, page
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SERVICE ! WARNING PROCEDURES Never service heater while it is plugged in, operating, or hot. Severe burns and electrical shock can occur. Upper Shell Upper Shell Removal 1. Remove screws along each side of Fan heater using 5/16" nut-driver. These Guard screws attach upper and lower shells together. 2. Lift upper shell off. 3. Remove fan guard. Figure 4 - Upper Shell Removal Fan IMPORTANT: Remove fan from motor shaft before removing motor from heater. The weight of the motor Fan resting on the fa
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Pump Pressure Adjustment 1. Remove pressure gauge plug from Relief Pressure filter end cover. Valve Gauge 2. Install accessory pressure gauge Plug (part number HA1180). 3. Start heater (see Operation, page 6). Allow motor to reach full speed. Pressure Figure 7 - Pressure Gauge Plug Removal Gauge 4. Adjust pressure. Turn relief valve to right to increase pressure. Turn relief valve to left to decrease pressure. Set pump pressure at 3.4 psi. 5. Remove pressure gauge. Replace pressure gauge plug in
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Burner 45° 13.Replace burner strap onto combus- Strap tion chamber. 14.Attach spark plug wire to spark plug. 15.Attach fuel and air line hoses to nozzle assembly. 16.Replace fan (see page 9). 17.Replace fan guard and upper shell. Nozzle Figure 12 - Spark Plug Rotation 1. Remove upper shell (see page 9). 2. Remove fan (see page 9). 3. Remove fuel and air line hoses from Combustion Chamber nozzle assembly. 4. Turn nozzle assembly 1/4 turn to left and pull toward motor to remove. Nozzle 5. Place pl
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(Pump Rotor, continued) 10.Install blades, pump plate, air Gap Adjusting Screw filters, and filter end cover. 11.Replace fan guard and upper .003"/.004" Gap Sandpaper shell. Measured With 12.Adjust pump pressure (see Feeler Gauge page 11). Note: If rotor is still binding, pro- ceed as follows. Blade Rotor 13.Perform steps 1 through 6 (see page 12). Gap Adjusting Screw Figure 18 - Sanding Rotor 14.Place fine grade sandpaper Figure 17 - Gap Adjusting Screw Locations (600 grit) on flat surface. Sand ro
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Note: Use only original replacement parts. This will protect your warranty cover- REPLACEMENT age for parts replaced under warranty. PARTS Parts Under Warranty Contact authorized dealers of this product. If they can’t supply original replacement part(s), call DESA International’s Technical Service Dept. at 1-800-323-5190. When calling DESA International, have ready • your name • your address • model number of your heater • how heater was malfunctioning • purchase date Usually, we will ask you to
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ILLUSTRATED 4 1 PARTS BREAKDOWN 5 2 9-1 39 9-2 3 9 9-5 7 6 11 9-4 9-3 8 21 10 12 18 13 20 22 23 16 34 35 24 25 30 26 28 27 32 33 31 36 38 29 37 19 12-1 12-2 17 15 12-3 14 12-4 12-5 40 12-6 12-7 12-18 12-8 12-17 12-16 12-9 12-15 12-10 12-14 12-13 12-11 14 MOTOR & PUMP 30 EAI/EBI PFA/P 003 12-12 102016
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This list contains replaceable parts used in your heater. When ordering parts, be sure PARTS LIST to provide the correct model and serial numbers (from the model plate), then the part Models B50G and number and description of the desired part. REM50B KEY PART KEY PART NO. NUMBER DESCRIPTION QTY. NO. NUMBER DESCRIPTION QTY. 1 M51104-01 Handle 1 17 M11084-26 Screw, #10-16 x 3/8" 2 2 098511-54 Upper Shell (B50G) 1 18 M50631 Rubber Bumper 2 098511-67 Upper Shell (REM50B) 1 19 M50899-03AA Side Cover
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WARRANTY AND REPAIR SERVICE WARRANTY SERVICE LIMITED WARRANTY Should your heater require service, return it to your nearest authorized service center. Proof of purchase must DESA International warrants this product and any be presented with the heater. The heater will be inspected. parts thereof, to be free from defects in materials and A defect may be caused by faulty materials or workman- workmanship for six (6) months from the date of first ship. If so, DESA International will repair or replac
