Question about Reddy HEATER R115 115,000-BTU PORTABLE KEROSENE FORCED AIR HEATER

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When i take the top of my reddy hearter off it will start right up . but when it is on it will not start>

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Check the condition of the spark plug electrodes. if they are dirty or cabon fouled the exra air movement with the cover on prevents the fuel from ignition. Also check the air pressure setting for the pump go to
http://www.msservice.net/desa/reddy-low.html for service parts
http://www.bealsmotor.com/Desa%20Hot%20Surface%20Manual.pdf for the service manual

My guess is the plug is dirty or air pressure is off causing the no ignition problem

Posted on Mar 27, 2011

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A worn nozzle creates a spray pattern, where a good nozzle creates a fog.With a coarse spray pattern poor combustion results in an off colorflame, . The photocelldoesn't like the color, sends a signal to the computer whichshuts everything down. That's the job of the electronics. On HSI ( hot surfaceignitor) heaters it is all about correct flame color , not just flame. The part where you write "If I remove the cover again it runsfine" is a symptom of a bad, worn, or restricted nozzle (generally).Remember- the ignitor only stays red for 5 seconds, then the flame keeps itselflit. The nozzle's pattern is a cone. Lift the lid & the pattern widens(aerodynamics) - replace the lid and the cone narrows & possibly distortsthen the flame goes out. This nozzle rule will only apply if everything is correct as far asfuel delivery applies. The pump pressure must be correct- not almost correct.Set the pressure with a low-pressure gauge that registers12-15 psi max. A gaugewith a higher scale just will not read close enough to satisfy the system. If the pressure is not correct, the aboverule will not apply. Instructionsfor setting the pressure can be viewed at http://reddyparts.com/pressure.htm. In addition, a fan can cause the same problem if damaged ormis-matched to your specific model. I must mention that any air leaks onthe pressure side (or vacuum leaks on the fuel line, for that matter) betweenthe pump and the nozzle will create a rich/lean mixture at the combustionchamber, creating an off-color flame.

Posted on Mar 27, 2011

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