Assessments - 5, GPA: 4.4
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10. Discard old motor. 11. Attach motor to motor mount with two nuts. Tighten nuts firmly. 12. Replace fan on motor shaft. Make sure set screw contacts flat surface on motor shaft. 13. Tighten set screw firmly (40-50 inch-pounds). 14. Carefully route motor wires through hole in shell (see Figure 7). Place motor, motor mount, and fan guard into rear of heater shell. 15. Insert screws through heater shell and into motor mount. Tighten screws firmly. 16. Turn heater on its side to access opening in bottom of base. Connect green wires from motor, transformer, and power cord to heater shell using ground nut (see Figure 5). 17. Attach black and white wires to terminal board (see Wiring Diagram, page 9, for correct locations) . 18. Replace base tray. Transformer Ground Green Lead Screw Terminal Board Motor Green Lead Power Cord Green Lead Figure 5 - Location of Ground Screw Motor Mount Screw Hole in Shell for Wires Fan Guard Motor Mount Figure 6 - Removing Motor, Motor Mount, and Fan Guard from Heater Hole in Shell for Wires Figure 7 - Replacing Motor, Motor Mount, and Fan Guard into Heater For more information, visit more information, visit 102370-01K 8 8 SERVICE PROCEDURES SERVICE PROCEDURES Continued FAN Remove motor, motor mount, and fan (see Motor, steps 1 through 8, page 7). 2. Clean fan using soft cloth moistened with kerosene or solvent. 3. Dry fan thoroughly. 4. Replace fan on motor shaft. Make sure setscrew is touching back of flat surface on motor shaft (see Figure 8). 5. Place setscrew on flat of shaft. Tighten setscrew firmly (40-50 inch-pounds). 6. Place motor, motor mount, and fan guard into rear of heater shell (see Motor, steps 14 through 18, page 7). Motor Shaft Fan Setscrew Figure 8 - Fan, Motor Shaft, and Setscrew Location Fan Hub Motor Shaft Setscrew Figure 9 - Fan Cross Section SPARK TRANSFORMER 1. Remove base tray. 2. Locate and disconnect white, black, and orange wires from spark transformer. 3. Remove two screws holding spark transformer to base. Remove sheet metal nuts on transformer and install on new transformer. Discard spark transformer. 4. Install new spark transformer. Position new spark transformer in same manner as old transformer. 5. Connect white, black, and orange wires to new spark transformer. Connect wires to correct terminals as noted in step 2. 6. Replace base tray. Ignitor Wire Bushing Figure 10 - Removing Ignitor Wire from Spark Transformer IGNITOR 1. Remove motor, motor mount, and fan guard (see Motor, page 7, steps 1 through 6) . 2. Remove orange ignitor wire from ignitor. 3. Remove ignitor mounting screw from rear head using nut-driver or standard screwdriver (see Figure 11). 4. Remove ignitor from rear head. 5. Install new ignitor. Attach ignitor to rear head with ignitor mounting screw. 6. Attach ignitor wire. Figure 11 - Removing Ignitor Mounting Screw and Ignitor Rear Head Ignitor Ignitor Mounting Screw For more information, visit more information, visit 102370-01K SERVICE PROCEDURES SPECIFICATIONS WIRING DIAGRAM ACCESSORIES 9 SERVICE PROCEDURES WIRING DIAGRAM Continued 100,000 Btu/Hr Model 7. Check gap between ignitor electrode and nozzle to .13"/.15" (see Figure 12). 8. Test for spark. WARNING: Make sure heater is disconnected from propane supply. Heater could ignite causing severe burns. Plug into extension cord and watch for spark between ignitor electrode and nozzle. 9. Place motor, motor mount, and fan guard into rear of heater shell (see Motor, page 7, steps 14 through 18). Burner Nozzle Gap Area Ignitor Electrode Figure 12 - Clearance between Ignitor Electrode and Target Plate SPECIFICATIONS Output Rating (Btu/Hr) 65,000 85,000 100,000 Fuel Consumption Gallons/Hour 0.7 .93 1.1 Pounds/Hour 3.0 3.9 4.6 Fuel Propane Vapor Only Supply Pressure To Regulator Minimum (for purposes of input adjustment) 10 psi Maximum Tank Pressure Regulator Outlet Pressure (Factory Preset) Manifold Pressure 10" WC Hot Air Output (CFM Approx) 475 Motor 3,200 RPM, 1/10 HP Electric Input 120 V/60 Hz Amperage 2.9 Ignition Continuous Ignitor Gap (Inches) .13/.15 Weight (Pounds) Heater 23 Shipping 29 Size - L x W x H (Inches) Carton 28.5 x 12.5 x 17 Heater 26.25 x 9 x 15.5 Black Green White Motor Ignitor Orange Blue Blue Auto Control Valve Thermocouple 1 2 3 4 5 6 87 Thermal Switch Terminal Board Blue Black Ignition ControlWhite Relay Green Green Black Black White White GreenPower Cord ACCESSORIES Purchase accessories and parts from your nearest dealer or service center. If your dealer or service center can not supply an accessory or part, either contact your nearest Parts Central (listed in the separate Authorized Service Center booklet) or call DESA Heating Products at 1-866-672-6040 for referral information. You can also write to the address listed on the back page of this manual. Fuel Gas Connector: LPA4020 - For All Models A POL adapter with excess-flow For more information, visit more inf...
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