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contactor L2=120 volts L2=208 volts
L1 to ground = 120 volts. - L2 to ground = 208 volts residential AC condenser this is voltage leading to the contactor. from L1 to L2 around 230 volts. helper used a cheater cord from L2 to ground and burn out his vacuum pump. always check voltage!! can anyone explain this please thank you in advance!!
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Single pole contactor? going thru cap?
UA Local 32 retired as of Jan 2020
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yes single pole contactor - voltage going direct to contactor - also air handler same way
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Single phase incoming power from pole?
UA Local 32 retired as of Jan 2020
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they might have had 3 phase -machine shop with large equipment Ac was used too cool small office,& breakroom
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Then sounds like the high or wild leg. Maybe TB will chime in.
UA Local 32 retired as of Jan 2020
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sorry just realized typo in title - L1 to ground 120 volts -- L2 to ground = 208 volts
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Did the vac pump go real fast, just before the smoke came out.
UA Local 32 retired as of Jan 2020
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yes vacuum pump run real fast trip off on overload he took the pump apart and bypass some wires turn it back on and smoked the motor good lesson always check voltage!
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Originally Posted by
doug1111
yes vacuum pump run real fast trip off on overload he took the pump apart and bypass some wires turn it back on and smoked the motor good lesson always check voltage!
Did it turn the condenser into a micro channel? Definitely grabbed the high leg of a delta.
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Originally Posted by
doug1111
yes vacuum pump run real fast trip off on overload he took the pump apart and bypass some wires turn it back on and smoked the motor good lesson always check voltage!
So i guess he owes you a new pump
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CleterD no the old train that was replaced was over 20 years old and the new system is running good
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Pecmsg - no the vacuum pump belong to my helper and he ended up getting a used one for a cheap cheap price 7 CFM- but all in all it was an expensive learning experience will not happen again always check voltage!helpers class instructor explained the voltage situation but by the time he explained it to me we still both don't understand.
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We all live and learn, somethings cost more than others.
UA Local 32 retired as of Jan 2020
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yes I agree and also they say things happen for a reason? and IF is a large word IF the vacuum pump was up to l1 this would not have happened and IF the voltage was checked as it should have this would not have happened but he ended up with a better vacuum pump for a cheap price. always check voltage do not assume 120 volts on both sides of contactor
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Something doesn't add up. L1=120 to ground. L2=208 to ground? And only 208 across? Something is up, but don't see it with those numbers.
Unless it's a delta Supply, with no neutral, but someone hooked up a neutral in the panel, so you have a floating reference. I'm just guessing at this point. Something still doesn't add up
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Originally Posted by
supers_5
Something doesn't add up. L1=120 to ground. L2=208 to ground? And only 208 across? Something is up, but don't see it with those numbers.
Unless it's a delta Supply, with no neutral, but someone hooked up a neutral in the panel, so you have a floating reference. I'm just guessing at this point. Something still doesn't add up
230 across, no neutral but box ground. It fits the high leg of a delta IMO.
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Except with delta you wouldn't have a ground reference, and no 120, unless it has some odd tapping.
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It is a Stinger Leg "High Leg Delta Transformer" Quite common
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Originally Posted by
lkapigian
It is a Stinger Leg "High Leg Delta Transformer" Quite common
Thank you sir. It's not common around here. Although i was thinking of something along these lines. Phase imbalances would be interesting though.
http://en.m.wikipedia.org/wiki/High-leg_delta
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