PROPANE CONSTRUCTION HEATER OWNER’S MANUAL Heater Size: 50,000 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 ...................................................................................... 4 Theory of Operation ...................................................................... 5 Propane Supply ..............................................................................
SAFETY INFORMATION Continued 2 100585 ! WARNINGS Continued Propane Gas: Propane gas is odorless. An odor-making agent is added to propane gas. The odor helps you detect a propane gas leak. However, the odor added to propane gas may fade. Propane gas may be present even though no odor exists. Make certain you read and understand all warnings. Keep this manual for reference. It is your guide to safe and proper operation of this heater. • Install and use heater with care.
PRODUCT IDENTIFICATION Hot Air Outlet (Front) Shell Handle Motor Fan Guard Heater Base Piezo Ignitor Button Automatic Control Valve Button Inlet Connector Power Cord Hose /Regulator Assembly Figure 1 - 50,000 BTU/Hr Model UNPACKING 1. Remove all packing items applied to heater for shipment. Keep plastic cover caps (attached to inlet connector and hose/regulator assembly) for storage. 2. Remove all items from carton. 3. Check all items for shipping damage.
The Fuel System: The hose/regulator assembly attaches to the propane gas supply. This provides fuel to the heater. THEORY OF OPERATION 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 piezo ignitor lights the burner. The Automatic Control System: This system causes the heater to shut down if the flame goes out.
INSTALLATION ! 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. ! WARNING Test all gas piping and connections for leaks after installation or servicing. Never use an open flame to check for a leak. Apply a mixture of liquid soap and water to all joints. Bubbles forming show a leak. Correct all leaks at once. 1. Provide propane supply system (see Propane Supply, page 5).
4. Open propane supply valve on propane tank(s) slowly. Note: If not opened slowly, excess-flow check valve on propane tank may stop gas flow. If this happens, close propane supply valve and open again slowly. 5. Check all connections for leaks. Apply mixture of liquid soap and water to gas joints. Bubbles forming show a leak that must be corrected. ! WARNING Never use an open flame to check for a leak. Apply a mixture of liquid soap and water to all joints.
OPERATION Continued 5. Open propane supply valve on propane tank(s) slowly. Note: If not opened slowly, excess-flow check valve on propane tank may stop gas flow. If this happens, close propane supply valve and open again slowly. ! WARNING Be sure motor and fan are running before pushing in automatic control valve button. Flames could flash outside heater if motor and fan are not running. 6. Push in and hold automatic control valve button (see Figure 5). Push piezo ignitor button (see Figure 5).
STORAGE ! CAUTION Disconnect heater from propane supply tank(s). 1. Store propane tank(s) in safe manner. See Chapter 5 of Standard for Storage and Handling of Liquefied Petroleum Gases, ANSI/NFPA 58 and/or CAN/CGA B149.2. Follow all local codes. Always store propane tanks outdoors. 2. Place plastic cover caps over brass fittings on inlet connector and hose/regulator assembly. 3. Store in dry, clean, and safe place. Do not store hose/regulator assembly inside heater combustion chamber. 4.
TROUBLESHOOTING ! WARNING Never service heater while it is plugged in, connected to propane supply, operating, or hot. Severe burns and electrical shock can occur. OBSERVED FAULT POSSIBLE CAUSE Fan does not turn No electrical power when heater is to heater plugged in. Heater will not ignite. Heater shuts down while running. REMEDY Check voltage to electrical outlet. If voltage is good, check heater power cord for breaks.
SERVICE PROCEDURES ! WARNING Never service heater while it is plugged in, connected to propane supply, operating, or hot. Severe burns and electrical shock can occur. Motor 1. Access ground screw through underside of heater base. Remove ground screw. Disconnect the green motor wire and the green power cord wire from underside of shell (see Figure 6). 2. Remove black and white motor wires from terminal board (see Figure 6). 3. Remove two wire guard screws. Remove wire guard. 4. Set heater on its base.
Motor (Continued) 10. Attach fan guard to new motor with three nuts. Tighten nuts firmly. 11. Place fan onto motor shaft of new motor. IMPORTANT: When placing fan onto motor shaft, make sure part number stamped on fan is facing motor. Attach fan nut to end of motor shaft. Tighten fan nut firmly. 12. Place motor and fan guard into rear of heater shell. Carefully route motor wires through hole in shell (see Figure 10). 13. Insert three screws through heater shell and into fan guard. Tighten screws firmly. 14.
Ignitor 1. Remove motor and fan guard from heater (see Motor, page 11, steps 1 through 5). 2. Remove black ignitor wire from piezo ignitor. Access ignitor wire through underside of heater base (see Figure 11). Push wire up through bushing in heater shell. 3. Remove ignitor mounting screw from rear head using nut-driver or standard screwdriver (see Figure 12). 4. Remove ignitor from rear head. 5. Install new ignitor. Attach ignitor to rear head with ignitor mounting screw. 6.
SPECIFICATIONS Output Rating (BTU/Hr) Fuel Fuel Consumption Gallons/Hour Pounds/Hour Supply Pressure To Regulator Minimum (for purposes of input adjustment) Maximum Regulator Outlet Pressure Manifold Pressure Hot Air Output (CFM Approx) Motor Electric Input Amperage Ignition Weight (Pounds) Heater Shipping Size - L x W x H (Inches) Heater Temperature Range for Heater Operation 49,500 Propane Vapor Only 0.5 2.3 10 psi Tank Pressure or 200 psi 18" WC 16" WC 275 3300 RPM 120 volt/60 hertz 2 Manual, Piezo 15.
ACCESSORIES Purchase accessories and parts from your nearest dealer or service center. If they can not supply an accessory or part, either contact your nearest Parts Central (listed in the separate Authorized Service Center booklet) or contact DESA International for referral information. Part Number Description LPA1020 10' Rubber Hose with Brass Fitting U.L. listed. LPA2140 Propane Gas Regulator U.L. listed. LPA3055 Hose/Regulator Assembly U.L. listed.
ILLUSTRATED PARTS BREAKDOWN 1 RUBBER WASHER FAN NUT 2 MOTOR 4 3 FAN MOTOR ASSEMBLY 7 5 6 2 19 16 10 9 39 8 20 41 38 26 18 26 17 39 28 21 22 11 21 33 12 35 37 14 31 24 17 29 32 13 11 36 40 15 23 25 34 16 27 30 100585
PARTS LIST This list contains replaceable parts used in your heater. When ordering parts, follow the instructions listed under Replacement Parts on page 15 of this manual. KEY NO. PART NO.
NOTES _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ _________________________________________________________
NOTES _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ _________________________________________________________
WARRANTY AND REPAIR SERVICE KEEP THIS WARRANTY LIMITED WARRANTY DESA International warrants this product and any parts thereof, to be free from defects in materials and workmanship for one (1) year 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.
