International Association of Certified Home Inspectors
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| Inspecting HVAC Systems Topics include heating, venting, and air conditioning inspections. |
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#1
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An HVAC tech was at my mothers home doing a routine maintenance when his elbow brushed against the ac line. He received a shock and started to investigate. He found the outer casing of the AC was reading 105 VOLTS????
after removing everything giving a load he still could not find out why? but he replaces a single pole lennox a the shut off with a double pole. That seemed to mostly fix the problem. There is still some minor voltage , i think he said 15volts. We dont know why the breaker did not trip. Obviously one of the legs is making contact with something it shouldnt. Has anyone encountered a similar situation? This guy and another veteran of HVAC were baffled. Joseph Tribuzio 708 453 8447 Tribuzio Home Inspection Services CHICAGOLAND, ILLINOIS www.thishomeinspector.com ID# NACHI07062507 IL Lic#450.003128 Radon lic# RNIT2008216 Home Inspector Pro Software HIP Web Hosting |
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#2
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Does this compressor have a heater?
"War is an ugly thing, but not the ugliest of things; the decayed and degraded state of moral and patriotic feeling which thinks nothing is worth a war, is worse. A man who has nothing which he cares more about than he does about his personal safety is a miserable creature who has no chance at being free, unless made and kept so by the exertions of better men than himself." - John Stuart Mill |
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#3
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Probably leakage from a conductor in the compressor to the case along with poor bonding of the case to ground. I would also verify proper connections in the panel for this circuits equipment ground.
B.A. King Home Inspections, LLC www.BAKingHomeInspections.com Serving Charlotte NC area and Rock Hill SC areas. CMI Certified Master Inspector and Independent License NC2449 and SC1597 704 301-3207 "Discovery consists in seeing what everyone else has seen and thinking what no one else has thought." - Albert Szent-Gyvrgyi, Nobel Prize for Medicine 1937 |
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#4
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nope, just a outdoor ac unit.
Joseph Tribuzio 708 453 8447 Tribuzio Home Inspection Services CHICAGOLAND, ILLINOIS www.thishomeinspector.com ID# NACHI07062507 IL Lic#450.003128 Radon lic# RNIT2008216 Home Inspector Pro Software HIP Web Hosting |
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#5
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The panel is a Wadsworth, I haven't been there to look it over but im still puzzled why it would not trip?
Joseph Tribuzio 708 453 8447 Tribuzio Home Inspection Services CHICAGOLAND, ILLINOIS www.thishomeinspector.com ID# NACHI07062507 IL Lic#450.003128 Radon lic# RNIT2008216 Home Inspector Pro Software HIP Web Hosting |
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#6
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Plastic condensor pad?
“Of liberty I would say that, in the whole plenitude of its extent, it is unobstructed action according to our will. But rightful liberty is unobstructed action according to our will within limits drawn around us by the equal rights of others. I do not add 'within the limits of the law,' because law is often but the tyrant's will, and always so when it violates the right of an individual.” - Thomas Jefferson |
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#7
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Quote:
Ever notice how a 14/3 or 12/3 cable will have 30-40 volts on the red wire when it is not connected to anything? This is "crosstalk" or simply leakage along the length of the cable from the black wire induced into the red wire. If you put even a very small load on that stray voltage it will disappear. B.A. King Home Inspections, LLC www.BAKingHomeInspections.com Serving Charlotte NC area and Rock Hill SC areas. CMI Certified Master Inspector and Independent License NC2449 and SC1597 704 301-3207 "Discovery consists in seeing what everyone else has seen and thinking what no one else has thought." - Albert Szent-Gyvrgyi, Nobel Prize for Medicine 1937 |
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#8
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Andrew, YEAH it is on a plastic pad.
Bruce, I'm going to take a closer look at that breaker and the grounding/bonding. The crosstalk sounds like a factor too. Joseph Tribuzio 708 453 8447 Tribuzio Home Inspection Services CHICAGOLAND, ILLINOIS www.thishomeinspector.com ID# NACHI07062507 IL Lic#450.003128 Radon lic# RNIT2008216 Home Inspector Pro Software HIP Web Hosting |
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#9
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Check the ground rod also
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#10
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Check to see if the capaciter is not starting to short out.
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