Question about Reddy R155D Utility Heater

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R155 and unburnt Kerosene

I used my R155 kerosene heater for years in my garage without any problems. Then the 097061-01 solid state relay went out. I replaced it with new part number 107850-01. At the same time, I also figured I would replace the filters, gasket, (HA3017) and the rotor (HA3004). When putting it back together, I used the HA1182 low pressure gauge I bought to set the psi to 5.0 psi like the manual said. Upon doing this, it would only blow out a cloud of atomized kerosene and not light. If I put my finger over the adjustment screw and let the pressure increase toward 10 psi, it would light but then go out as it returned to 5.0. I tried increasing the pressure. At ~6 psi would allow it to stay lit but your eyes burned from unburnt kerosene as it ran longer and longer. I decided to replace the other components related to the fuel air mixture (HA3010 nozzle and PP211 spark plug). No improvement. I increased the pressure to 8.5 psi which made the end cap glow slightly but it would stay lit and not put out a cloud as it tried to start. While running at 8.5, slowly you notice a sore throat and burning eyes from the unburnt kerosene. Can you help give me some guidance as to what is wrong or what to check???

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  • Vicious6 Feb 17, 2008

    I have the older model which is doing the same thing, mine is the R155A. I have replaced the plug, cleaned the nozzle, replaced the fuel filter, set the fuel pressure and cleaned the lint filter and so on. I am starting to think there may be a rotor problem. It will burn your eyes out when it does run, when it does not it smokes up the entire garage. This must be a common problem with these things.

  • cjwert Feb 21, 2008

    Is there a specification for the plug gap and for the depth of the tip?
    If not, do you just keep adding shims to back up the plug until it
    won't stay lit???

    Thanks-

    Chris

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Check plug gap and depth of the tip. The spark may be to far into the fuel spray flooding it out. DESA says use a standard spark plug washer or two for shims if needed.

Posted on Feb 21, 2008

  • Todd Gibb Feb 22, 2008

    The gap is .075 inch. No spec on depth just enough that the plug doesn't foul with carbon or become wet with fuel. Good Luck.

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