Question about Mr. Heater Portable Kerosene Heater - 175,000 BTU

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I have a all pro 175,000 btu forced air heater, it will run for 5 to 10 minutes, and then trip the breaker, I have set fuel pressure to 5.75 as stated in the book and the gauge on the machine is read

Starts but won't stay running

Posted by Anonymous on

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6ya6ya
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Posted on Jan 02, 2017

hotuna
  • 288 Answers

SOURCE: MHU 75 Model Mr. Heater

The roll out switch is a small disc shaped part about the size of a nickle. There may be more than one. anyway there is a button shaped like a small peg in the center if it, push it in and it should stay in. You may need to re examine the limit switch, because this is what it sounds like. they are rated for a set temperature, so your application may need a higher temp. A simple way to check parts like these is to by-pass them by taking the wires off the part and connecting them together. If this solves the problem, that it. My only concern is that this is a new installation, and maybe its not venting adequately or its burning up all the usable air in the room. That's why most of these parts are on the equipment.

Posted on Dec 24, 2007

Therinnaiguy
  • 1420 Answers

SOURCE: Intalled an overhead 130K BTU Mr. Heater last

On a call for heat, the 24 volt thermostat sends a signal to the control module. The control module will indicate a call for heat with a light on the control either blinking or remain solid depending upon model. The inducer (exhaust) blower will purge all gasses from the furnace and pressurize a pressure switch. Once the pressure switch tells the module to continue, the electronic ignition will energize and send 120 volts to the igniter. The igniter will glow and you will be able to see it if viewed thru the small inspection port. Once the igniter gets hot enough, it sends a signal to the module opening up the gas valve (24 volts). Either a pilot will come on or the burner tube will ignite then spread the flame to all burners. Lastly a safety sensor will be looking for a certain temperature within a few seconds and the furnace will continue to operate and the room air blower will turn on in a minute or two.

What could go wrong? The unit will not run if there is no signal from the thermostat (bad thermostat or broken wire), the control module does not sense a signal from the thermostat (bad control), the inducer does not energize (bad motor), the pressure switch does not close (blocked vent piping, bad switch, plugged condensate hose), the igniter does not energize (bad control, bad igniter), the gas valve does not open or there is no gas (bad gas valve, broken wire, no gas), the pilot does not light (dirty pilot), the burner does not light (bad burner, plugged orifice, not enough combustion air), the flame does not spread to each burner (bad flame spreader, dirty flame spreader, more bad burners), the flame safety sensor does not detect flame (dirty or bad flame spreader, bad flame sensor, broken wire, bad control), or the room air blower does not energize (bad fan motor, bad control).

Posted on Dec 01, 2009

wilsodfarm
  • 986 Answers

SOURCE: pilot will not stay on

replace your regulater,which almost cost as much a a new heater.I have own 4 or 5 and finally got a good one,I have in the past cleaned out the regulator that was plugged with oil from the propane,they put oil in the propane for leak detection,I hope this helps you

Posted on Dec 02, 2009

Testimonial: "Thank You. perhaps it is not adjusted properly. I so appreciate the quick response..Good Job!!!"

jusjunk
  • 72 Answers

SOURCE: my mr heater won't stay running

No pilot in this unit.
Check the thermocouple and its connections.
The thermocouple is the device that has the copper cable connecting it to the vave unit. It leads up into where the burner can "heat it up". This indicates to the controll valve that the gas is actually burning and keeps the valve open.

Posted on Jan 06, 2010

  • 117 Answers

SOURCE: Installed new heater it ran

the high limit is an over heat switch that could mean the unit is over fired. you would need to time input or check manifold pressure. the roll out switch is a switch that shuts the unit off if combustion is spilling at the divitor on the unit where the vent connects. with this you need to check your venting

Posted on Jan 05, 2011

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1 Answer

I have an All Pro 150000 btu kerosene / diesel torpedo heater. It runs for a few minutes and then starts sputtering, shooting flames and smoke. What causes this problem?


First thing is to download the service manual.

http://www.desaparts.com/service_manuals.html

You need to make sure the filters are clean and that you are getting the proper air pump pressure.

If the units starts up and runs good and slowly goes out it will normally be due to a lack of fuel getting to the nozzle. When there is not enough fuel being delivered to the nozzle from either a clogged fuel filter of dirty air pump output filter the unit will slowly shut down from lack of fuel.

If the unit shuts down while it is running properly and the nose come is orange then you probably have a problem with a photocell or the flame out control.

If you have other questions you can contact our service department at 269-685-4125 at extension 224

Thanks

M Cramer

www.allpartsinc.com

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