Question about Reddy HEATER R70DT 70,000-BTU PORTABLE KEROSENE FORCED AIR HEATER

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Runs when started but won't stay running.

I have a Reddy Heater R70DT that runs every time I start it but only stays running for about 20 min. I wait about a minute and it starts right up but only stays running about 10 min. The more times I start it the less time it stays running. I have cleaned the nozzle and filters and things and that hasn't helped. I have clean fuel. What could fix this? Also what are the settings on the 2 screws? Thanks for any help you can give.

Posted by Anonymous on

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  • 74 Answers

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......
runs when started but won't stay running. - 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.

Posted on Mar 04, 2015

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SOURCE: RM115 Reddy Heater forced air heater problem

air pressure should be no more than 3.5 psi. could be your pressure is too high and is blowing out the flame.

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have you cleaned the little sponge filter?

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tinytrees
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SOURCE: Sears forced air kero heater wont start, spitting fuel out front

sounds like the ignitor is bad, mine would try to light and do the same thing. I noticed one night that it was arcing out the entire length of the wires to the plug. If you have a good spark then i would suggest a CAD flame sensor, very cheap.

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SOURCE: pro 110, runs 10 min., blows white smoke ,shuts off

the first thing you need to do is go back to useing K1 kerosene, diesel fuel not only burns dirty but also has a tendency to gel up in cold weather which could be makeing it hard for the heater to draw the proper amount of fuel. To reset the pressure you will need a gage, it should run at about 6-7 psi. you can order a pressure gage from mr. heater online, they are by far the cheapest I have found as they are the actual manufacturer or call 1-800-251-0001

Posted on Feb 05, 2009

hardrocko
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SOURCE: R55B Reddy Heater won't stay running. (PMS? menopause?)

Wow! Yours is the best description of a problem I have ever seen!!! Before I read the whole thing I figured you missed the pressure check as most people do but you nailed it. This is what I would try, Replace the air filter, the fuel filter, and the fuel (to make absolutely sure there is no water in the fuel) and readjust the fuel/air mixture. If that does not do it replace the cadmium cell they only cost pennies. Let me know how you make out and good luck.

hardrocko

PS, I have one of these so I am pretty familiar with the problems.

Posted on Feb 03, 2010

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Wow! Yours is the best description of a problem I have ever seen!!! Before I read the whole thing I figured you missed the pressure check as most people do but you nailed it. This is what I would try, Replace the air filter, the fuel filter, and the fuel (to make absolutely sure there is no water in the fuel) and readjust the fuel/air mixture. If that does not do it replace the cadmium cell they only cost pennies. Let me know how you make out and good luck.

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jack
c132367.jpg

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