L.B. White Therma Grow HW220 Owner's Manual And Instructions
Also see for Therma Grow HW220: Owner's manual and instructionsOwner's manual and instructionsOwner's manual and instructions
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Contents
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1141. Remove the motor mounting plate screws and pullthe fan and motor assembly from the housing.2. Loosen the square head set screw(s) on the fanwheel.3. Pull the fan wheel from the motor shaft. Use a wheelpuller if necessary.4. Remove the four (4) nuts securing the motor to themounting plate.NOTES:a. Fan wheel to motor mount plate spacing must beadjusted to the clearance specified in the tablebelow before tightening the fan wheel to themotor shaft.b. Make sure that set screw(s) of the fan are on theflats of motor shaft when tightening.FIG. 11MOTOR AND FAN WHEEL ASSEMBLYMOTOR MOUNT PLATE FAN WHEELCLEARANCEMOTOR 1/8 IN.Service InstructionsGENERAL1. Close the fuel supply valve to the heater anddisconnect the electrical supply before servicingunless necessary for your service procedure.2. Open end panels for access to heater components.3 Disconnect the appropriate electrical leads for thecomponent being replaced.4. The thermostat, and high limt switch can be tested byjumpering the suspect part out of the electricalcircuit.:-- Reconnect the electrical supply and open fuelsupply valves.-- If the heater lights, the component is defectiveand must be replaced.-- Do not operate the heater with the componentjumpered. Replace the part immediately.-- An alternate method for checking thecomponents is to perform a continuity check.5. Do not jumper the air proving switch. If jumpered, theignition control will not allow heater operation. Testthe air proving switch for continuity. If defective,replace the switch6. For reassembly, reverse the respective serviceprocedure. Ensure gas connections are tightenedsecurely.7. After servicing, start the heater to ensure properoperation. Check for gas leaks with approved leakdetectors.8. Clean the heater’s orifice with compressed air or asoft, dry rag. Do not use files, drills, broaches, etc. toclean the orifice. Doing so may enlarge the hole,causing combustion or ignition problems. Replacethe orifice if it cannot be cleaned properly.WARNINGFire and Explosion Hazard■ Do not disassemble or attempt to repair anycomponent part of the heater, including regulatorsand gas hoses.■ All components must be replaced if defects arefound.■ Failure to follow this warning will result in gas leaks.■ Gas leaks cause fire or explosions, leading toproperty damage, injury, or death.WARNINGBurn Hazard■ Heater surfaces are hot for a period of time after theheater has been shut down.■ Allow the heater to cool before performing service,maintenance, or cleaning.■ Failure to follow this warning will result in burnscausing injury. |
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