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Hot water pressure washer

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Fred

03-02-2000 11:28:21

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I have a hot pressure washer that pumps water just fine but it won't make the water hot. I have checked the fuel ( sprays a good fine mist), The transformer has voltage to it. Now, how do you check a transformer? Also, when the transformer is working correctly, should there be constant sparking across the little electrode tips? This is a 110 volt unit that was given to me, don't know the brand name.

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Tyler(WA)

03-02-2000 12:04:09

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Re: Hot water pressure washer in reply to Fred, 03-02-2000 11:28:21

Is this an oil fired heater... like the gun off an oil furnace? Transformers are easy to check but if this is an igniter transformer, it probably has some fail safe devices that should be checked first.

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Fred

03-02-2000 12:24:48

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Re: Re: Hot water pressure washer in reply to Tyler(WA), 03-02-2000 12:04:09

Yes, it ignites the fuel. Also it has safety shutdown features like you said. No water flow or excess water temp will shut the burner off. I will check all these things real good before I yell back. Thanks for answering. Is the igniter type transformer hard to check out? Is it expensive?

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Tyler(WA)

03-02-2000 13:12:15

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Re: Re: Re: Hot water pressure washer in reply to Fred, 03-02-2000 12:24:48

It's easy to check out. Use an Ohmmeter to check resistance on the secondary... typically the pair of springs that contact the electrodes. They should read some resistance. Next, check either lead to ground (the case). You should see some resistance between the two springs but none to ground.

If this seems OK, fire the puppy up with the transformer flopped back (or turned over). With 110v. applied to the primary side of the transformer, touch the metal shaft of an insulated screwdriver (one with a plastic handle) to one spring and move the tip of the screwdriver to within about 1/4" of the other spring. You should see sparks jump between the tip and the second spring (I told you to hold on to the plastic end for a good reason.) The sparks should be blue or white. A weak yellow spark isn't good.

That completes both the static and dynamic test of an exciter transformer.

Most cases the problems you are having are related to the electrodes being mis-alligned. They need to be less than 1/4" apart and below the actual stream of fuel vapor. See your owner's manual or maintenance manual for exact allignment.

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Fred

03-02-2000 13:44:05

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Re: Re: Re: Re: Hot water pressure washer in reply to Tyler(WA), 03-02-2000 13:12:15

Thank you very much, I will go through the thing and see what I can find. Sure hope it's something simple. Thanks again.

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Jeremy Warren

05-23-2004 10:09:39

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Re: Re: Re: Re: Re: Hot water pressure washer in reply to Fred, 03-02-2000 13:44:05

OK Fred Just in case you got no further with that hot-water pressure cleaner problem....here's my meagre bit of advice.
Having spent many years trying to build a steam cleaner and finally succeeding I reckon I have learned a great deal about how tricky these things can be. Tyler is right on the money with what he says but I may have more to offer.
The igniter will typically be a straight 18Kv transformer which will be triggered by a simple electronic eye. When there is a flame there is light and the igniter stops and if the flame shouold fail the igniter automatically starts up again, the flame baffle at the front of the burner(the bit that looks like a Leonardo Da-Vince helicopter blade)will allow the initial flame to reignite the new fuel. The position and cleanliness of this baffle is important. Experimentation will show you what is best. The spray nozzles will wear after a while and it may be necessary to either readjust the air flow and baffle for the optimum burn or at worst to get a new nozzle. Make sure there are no fuel leaks in the line to the nozzel as this will reduce the efficiency of the nozzle to attomize the fuel. Back to the beginning now...If the electric eye is bust you can circumnavigate the wiring and put a 3-5 second timer in its place as this amount of time will be sufficient to get the thing going if it is set up right( this is what I have done)however if the flame dies then you will have to re-start the burner. Just in case you are wondering why i didn't buy a burner it is because I am in Taiwan and it is hot here so they don't use oil burners much and also I have yet to see a steam cleaner here in the 13 years that i have lived here!!
Any way...there are also solid state igniters which are light and powerfull. I made my own ignitor(several versions before one worked) and I could give you details if you are mad enough to invest the time in making one!. The problem with your system may also rest in the fact that if the igniter probes, near the nozzel tip, get saturated with oil then the spark will track( not jump). I am not fond of Tyler's idea of using a screwdriver to test the arc flame but the gap does need to be about a quarter of an inch and the arc flame should look good and fat not the same as a petrol engine ignition arc flame which would not work. The transformers will burn out if you use them for more than a few minutes (seconds more like) so dont torture your igniter. I have found that the arc will work just fine above the flame and have seen commercial models that are rigged this way. It is fascinating to note that the air blown by the blower actually blows the arc in a bow which looks really cool but the point is that the arc can be 3-4 mm behind the nozzel front and still work well. I reckon I must have bored you to sleep by now so I will shut up but it has been fun to share my hard earned knowledge!
Have fun , Jeremy

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