Question about Reddy Heater R70 Portable Forced Air Space Heater - 70,000 BTU

1 Answer

Won't stay running

I can only keep it running with the cover off

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  • Paul Bede Dec 01, 2008

    I have the same problem, will only fire if cover is off, I tried jumping the cad cell and no difference.

  • dadiekman Dec 23, 2008

    I have maybe the sae issue, it will tart fr about 20 second and die alng with flipping the breaker ?? Help please. It kerosean

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  • 625 Answers

Is this kerosene or propane. if kerosene, two types of ignition is used.  a spark plug or a hot surface ignitor.  the kero unit uses a cad cell flame detector, the propane unit uses a millivolt generator.
the kero unit uses an air pump that comes off the backside of the fan motor - this airline goes to the nozzle and acts like a siphon for fuel.  there is no air pump for the propane heater. the fan just accelerates airflow through the combustion chamber.  the cad cell of the kero unit sees the flame and varies its resistance.  it is sensitive to the infrared generated by the flame and feeds this signal to the lockout relay. no flame after a few seconds, opens and locks out the unit.  the propane unit uses a millivolt generator.  it is a copper cappillary tube that has two spade connectors on it. the spade connectors are connected to a high limit mounted on the backside of the combustion chamber.  under normal conditions the hi limit is closed and completes the electrical circuit to the main valve. the millivolt generator is electrically connected to the pilot/main valve electromagnet inside. with a flame detect signal the electromagnet is energized and holds the main valve slug open allowing the propane to feed to its nozzle in the chamber. as long as there is a flame the valve stays open. no flame, no signal and the unit releases the valve pellet and closes.  you can test the hi limit by jumping out the two spade connectors and see if the unit starts and stays running.won't stay running - da8a32c.jpg

Posted on Oct 15, 2007

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