cd
New Member
Posts: 1
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Post by cd on Dec 26, 2021 2:40:37 GMT
Hello all this is a neat site I love it thanks for letting me join. I have 2 Servel Kerosene machines but I have now rescued on of these dr machines from a scrapper. It does run but when you touch it it shocks you and a small spring looking gadget gets hot and trips a contact to the off position any ideas where to start THANKS
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Post by turbokinetic on Dec 26, 2021 14:45:34 GMT
Hello all this is a neat site I love it thanks for letting me join. I have 2 Servel Kerosene machines but I have now rescued on of these dr machines from a scrapper. It does run but when you touch it it shocks you and a small spring looking gadget gets hot and trips a contact to the off position any ideas where to start THANKS Hi, and welcome to the forum! I hate to say it, but the problem you describe sounds like the overload breaker is shutting off the motor because it is drawing high current. The overload breaker is comprised of a heating element which looks somewhat like a spring; and a bi-metallic strip which flexes from the heat and releases the run contact. This is in place to protect the motor from burnout if there are other electrical problems with the system. The shocking is caused by a ground fault in the system. Was the unit out in the rain, at the scrap yard? Being a realist, I would want to warn you that the possibility is that the compressor motor winding is failed and has shorted internally, and shorted to ground. The DR machines are all going on 85 years old and they were an early design and part of GE's learning curve. If this is the case, it's a very costly and specialized repair. Having said that, other things to check are the crankcase heater. It could develop a ground fault and result in the shock issue. That is not internal to the compressor and can be replaced relatively easily. The overload tripping can also be caused by a problem with the control; wherein the start relay is not switching off the start winding, after startup. Could you share pictures of the unit, and the control with the cover off? Do you have a current meter to see how many amps it is taking? Sincerely, David
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Post by elec573 on Jan 2, 2022 5:42:07 GMT
I agree with what turbo said I’d just add look through the dr section there’s a wealth of information there. Also you can download and print out the manual for the drs for free from this site.
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