Question about Desa International R70DT Oil Filled Utility Heater

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My Model R70DT will not light and run

When I plug unit up all I get is a Humming sound like the motor is frozen. I have removed the top and the motor does not turn free as it should which idicates to me it is a motor problem. I have in the past take motors of this tyoe apart and free them up using a good grade of oil to clean and lubicate them. In this case I do not have manual and I'm not sure what and how all the parts attached to back of motor work.
If I need to replace the motor where do I get one?
Could you please attach a manual for future use?
Thanks in advance for you help,
Brossie Jones
brossiej@charter.net


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Here is a link to the manual you requested... http://12.153.20.74/manuals/111167-01C.pdf. It could be that the pump rotor is binding. Check to see if there is debis in pump, if so blow it out with compressed air. Check the gap pn the rotor.(Adjust to .076/.101 mm) On page 14 of the owner's manual you can find pics and instruction on checking and servicing a pump rotor binding. If this does not work for you, then I suggest you contact Master Parts for the parts you will need. You can contact them toll free at 800-466-1446 or online at www.masterparts.net.

Posted on Jul 13, 2009

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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.
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  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......
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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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http://www.desatech.com/manuals/Construction%20Heaters/111167-01.pdf

I hope this helped you. Please let me know.

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