Question about Reddy R155D Utility Heater

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Master Reddy 30,000 btu heater put out nasty fumes.

I have adjusted the air pump pressure anywhere from 2 psi to 3 psi range and it runs fine until I install the top sheet metal back on it then it puts out fumes so bad you can't stand it for it burns your eyes so bad. I have cleaned the fuel filter screen and nothing was in it. I took the rotar and blades out to relace them but they were like new so I blew everything out with compressed air a put it back together and does the same thing. I took the nozzle out blew it with compressed air and found nothing wrong ,it was perfectly clean, along with both fuel line and air hoses. Spark plug is gapped at .055 " where as a sticker on inside of heater reads range is .055" -.060".No mater where I adjust the air pressure ,it runs fine until I install the top sheet metal cover.Can anybody help me with this problem? Thanks..

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  • elbo46 Jan 26, 2009

    Thanks for the help. I installed a new air line, it still did the same thing, after putting on the cover it put out the same fumes so bad it would burn your eyes.Then I cranked the air pressure up to 4 P.S.I. and it cleared right up and has been working A-OK ever since. Thanks for the help...Its nice having a web site on repairing things yourself without haveing a fee to get an answer,Maybe someday I can help someone out by returning the faver.Thanks again ,Randy

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  • 92 Answers

Sounds like it's not getting enough air to fuel mix, check your air inlet line for breaks or just put a new one on for a couple bucks. any fuel line thats the right diameter will work, got mine from auto zone.

Posted on Jan 22, 2009

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1 Answer

Runs when started but won't stay running.


REAL FACT is: If all individual components of the heater are at 100% but the air pump pressure is not on it's mark, then the heater WILL NOT continue to run!
Air Pump Pressure is directly related to fuel delivery. Read that statement again! It is the most important line of text on this website.
If the pump pressure is incorrect, then, the fuel delivery will be incorrect. As a result, the heater will not run to specs.
Instructions for setting the air pump pressure:
Air pump pressure is the pulse of the heater. Pump pressures range from 3 psi to 6 psi depending on heater BTU size (see chart below). A loss of ONLY 1 psi translates to a 30% to 17% loss of FUEL FLOW (starvation). You must know the specified required pressure and set the pressure accordingly.
Heaters with Hot Surface Ignitor technology are extremely critical to pump pressure. If the pressure is off by 1/2 psi, the heater may run for 5 seconds, then shut down because of IGNITION FAILURE. The only way to correct this problem is to set the pump pressure to DESA's recommended pressure specification.
  1. The FIRST STEP in diagnosing any heater problem should be checking the output of the air pump. Determine the air pressure required for the heater model that is being tuned. The air pump, in turn, is responsible for fuel delivery.
  2. If you do not know the required pressure look for a decal on the side (usually) of your heater. This decal will state the model number, serial number, fuel capacity, pump pressure, etc.
  3. If your plastic end cover looks like this......
m29609t.jpgM29609 has 2 threaded holes. The hole on the left has a square plug inserted. Remove the plug. Screw in the nipple end of the gauge into the threaded hole. Check for air leaks with soapy water.
or
If your plastic end cover looks like this......
m16545t.jpgM16545 has 2 threaded holes. The shorter projection with a hole on the left has a square plug inserted. Remove the plug. Screw in the nipple end of the gauge into the threaded hole. Check for air leaks with soapy water.
4. The other hole (longer projection) has a screw with a hole which adjusts a ball and spring relief valve assembly. Carefully adjust the screw until the gauge is reading the pressure level that is specified on the heater's label. If operating properly, the pump should produce more pressure than is required to operate the heater. The relief valve allows the excess air to escape before being sent to the nozzle.
5. Replace plug. Test for leak.
6. If you are unable to reach the desired pressure spray soapy water around the seal of the end cover- at the same time check the plastic cover for a crack. A cracked end cover will not allow the heater to perform properly and will not allow for an accurate reading. The pump must be set at the specified pressure in order to have adequate fuel delivery an adequate fuel atomization. Replace if needed.
7. If you set the pressure to specs and the heater does not perform properly or the cone does not glow a soft red, then check for other fuel delivery problems such as a clogged fuel filter, cracked rubber hose, clogged or worn nozzle, or a cracked nozzle adapter. Soapy water lightly sprayed in these areas will quickly identify the problem most of the time. Any air leak will create problems.

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Handy Master Fumes so Bad your Eyes can"t take the smell


It sounds like it's not getting enough air to fuel mix, check your lines.

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Here are a couple of tips that I wrote that tell you how to troubleshoot aTorpedo or Reddy heater...

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/,,,.

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