Question about Reddy Heater-40,000 BTU Kerosene w/T'stat

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50,000 btu ready heater not enough pressure 2.5

Psi all i can get ,drained tank do i need fuel for setting pressure

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Fuel is not necessary to set the pressure.

If you can't get more than 2.5 you either have an air leak or the rotor/vanes are worn. Remove the airline from the elbow at the pump and plug the elbow, run the pressure screw all the way in. If the pump is OK and there are no leaks the pressure should go up to about 10 psi.

Posted on Feb 15, 2009

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I have 2 heaters that will run out of fuel when tank is still half full


What size LP tank are you using? If you are running (2) 175,000 btu heaters on a tank that is too small, especially in this cold weather, it will not have enough vaporization to keep up with demand. This will cause the outside of the tank to frost up and the pressure inside will be too low to run the heaters. You need more wet surface area, i.e. a bigger tank or just manifold 2 tanks together.

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The line from the pump to the nozzel should go inthe front fitting and the one from the tank goes to the backfitting. If either of these have cracks in them or do not fit tightly over the fittings it will not build enough pressure and burn. You may also check the filters mainly the output filter as this will also effect pump pressure. I don't have as much experiance with that brand so I can't be sure exactly about the pressure. I think it should be 3.5 to 4 Psi. If this doesn't help please email me and I will find out for sure.

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If you can only get 4 psi from the pump then you have a problem with the rotor. This could be from the vanes not coming out properly of if you have replaced or serviced the rotor you may not have the clearance set properly between the pump ring and the top of the rotor.
Make sure to inspect the pump cover for any small cracks..

If you pump pressure in not enough the unit will not be able to pull fuel from the tank and you will see the burner cone slowly start to go from the orange color to a dark color and the unit will shut down.

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Is there a Desa heater repair facility in York Pa


most likely the fuel pressure is wrong. you need a fairly accurate gauge to reset it. there are two screws in the back of the heater, one is a cover for the gauge port the other is a regulator to adjust the pressure, the pressure is set between about 3 and 6 psi depending on how many btu s your heater is. bigger heater bigger psi. for example a 60k btu heater is set at 3.4 psi. these gauges cost 30-40 bucks online, but if you have a welding supply store or a northern tools nearby you can usually find an inexpensive acetylene gauge that will measure that fine and at at that low a pressure. all you need to do is make up a little adaptor to fit, parts also available at same store. mine cost about 7 dollars all in. the pressure setting is critical on these heaters, you cant swag it, you really have to have a gauge and set it.

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You must set the pressure! If the heater runs with your compressor connected, but won't when the pressure is disconnected, well.......

Setting the pressure is easy!

Jan 15, 2009 | Reddy Heater-40,000 BTU Kerosene w/T'stat

1 Answer

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Remove plug on left and install low pressure air gauge. Adjust right screw to 3.4 psi on the gauge. See web site www.Desatech.com Manuals with parts breakdown are available on line.

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