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Lg a/c unit11500btu

Unit was wired in for 208 instead of 120 volts.blew mini fuse there were flashing on pc board where leads come off board and go to capacitor.corrected wiring and replaced fuse.tryed start ,stayed in for 2 sec. then popped.is pcboard shot?

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What popped? the new fuse or something else? The pc board will have a transformer built on it. It looks like a little coil.The fuse is supposed to protect that, but if you replaced it with a larger amp that the original, then , it may have burnt the coil out. The plug is supposed to be a different design to prevent the wrong voltage from being applied like your case. Why was this able to happen? For example 208 looks like I- and 120 is like II

Posted on Mar 12, 2008

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Where can i obtain a wiring diagram


A one phase 3 wire system has a center tap. Two hots and a neutral. Typical 120/240 volts.
A three phase 4 wire system has Three hots in a Y or Delta. The Y system has three hots and the neutral comes from the center of the Y, this is the neutral and grounded conductor, 120 volts from hot to ground and 208 volts hot to hot. In a 3 phase system the voltage is not doubled hot to hot as in a single phase system because the hots are 120 degrees phased from each other and the square root of 3 is the factor, multiply the 120 volts by 1.73 to get 208 volts hot to hot. Multiply 208 by the reciprocal of 1.73 and get 120 volts. Your exact application is not given so it is not known. A delta system is a triangle and the angle of each triangle is a hot wire, one angle would be grounded or the center tap of one of the sides of the triangle. Y is the configuration of the windings of the alternator or transformer and Delta is the configuration as a triangle of the windings of the alternator or transformer where the power supply is.

With a three phase home service, you can only connect two hots from your single phase generator, and the neutral. One of the house's hot does not get connected and any three phase loads in the house should be switched off and kept from energyzing or a circuit breaker or fuse serving that 3 phase load may trip.
Only one power supply can be connected at a time. The power company power must not be connected at all while using an alternate power supply unless your power supply has means to synchronize the alternating cycle.

It is adviced that the loads be kept within 10% of their rated voltage, especially motors.

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2 Answers

I have Mitsubishi Mr. Slim Model R410A and the outdoor unit is not working the fuse was burnt I changed the fusebit is still not working


Could be several things causing the problem. You didn't say what size fuse you replaced. If you replaced the small fuse on the control board then you probably have a bad board.

If you replaced the fuse that provides 120/208 volts to the unit then either the compressor is bad, you may have a short in the power wiring or the fan motor is bad.

All three things can cause the fuse to blow.

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1 Answer

LP126HD3A rated for 265 volts AC single phase I have 240V ac single phase, how can I use this unit on 240V ac


You'd need to supply a "Buck-Boost" transformer to do this properly. Technically, the 265 VAC is one hot leg and neutral of a 480 VAC 3 Phase Y system that measures 277 VAC. The 265 number comes from this:

265 is the standard nameplate voltage for a 277 volt motor or AC unit.

230 is standard name plate for 240.
200 is standard name plate for 208
460 is standard name plate for 480.
110 is standard name plate for 120.

Most electricians call the hot leg / neutral circuit "277V AC".

Some popular "Buck-Boost" transformers will convert 208 to 240 and 240 to 208 volt systems, and 240 to 277 and 277 to 240 volt systems - among many other variations. These are auto-transformers as the primary secondary windings share a connection. KVA ratings differ significantly from name plate because of this fact. You should contact a qualified electrician to not only size, but wire the transformer for you. Failure to install a Buck-Boost transformer - and running this unit on 240V AC mains will cause premature failure of motors - fans and compressor due to overheating. This can also result in a fire hazard.

I hope this helps and good luck!

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1 Answer

Okcarltons one additional question. how do i identify the 208 volt side of the transformer


Follow the wires the 208 volt will lead you to the fuses or breakers, the 24 side will go to sequencers relays coils, thermostat ect. one side of the 24 volt will usually go to chassie ground.

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1 Answer

THE BLOWER ON MY FURNANCE WON'T WORK


The first thing to check with a multimeter is if the motor is receiving a 120 volts from the control board and the way to do that is put one of your meter leads on a neutral terminal on the board and the other lead to the HEAT terminal on the board, you should get 120 volts. if not the control board is bad and must be replaced. if you are receiving a 120 volts then turn off power to the furnace and set your meter to continuity, Take the white motor lead and put one meter lead to it and then the other meter lead to the other wires from the motor one at a time, u should have resistance if not the motor is bad and must be replaced. Also check the run capacitor connected to the motor, make sure you discharge the capacitor first and then use a meter and check if it;'s working properly.

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yes your ok if they say the unit doesn't need to be changed in the incomimg power from 208 up to 230 volts or vice-versa,normally they classify motors as120/208/ 230 /460 volts, instead of 120/240/480 volts,but all line voltage varies in this voltage range between 230 to 255 volts a.c. with a +10/-10 percent tolerance either way,and as long as the instructions dont say anything about changing motor connections your good to go, just look on the motor body if possible and make sure theres no wiring diagrams to change voltage,but i would say no in a package A/C like that, and as far as the current goes your good with the 20 amp tandem pole breaker,let me know if i can further assist you. thanks

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2 Answers

We purchased a Amcor Amcoraire Mini Split Unit ? 12000BTU However the Power Transformer Input: AC115-120v 60hz Output: 10.5v 550mA isn't working as per the installer and we can't seem to find it...


Hi, this is a 1-ton cooling unit per your numbers. If they just installed it and the line side (120 volts) is good but nothing on the secondary low voltage side, they should have replaced the transformer themselves? If it is a split system, it is normally on all splits to be located in the indoor unit control section. I can't tell you exactly, but look where the 120 volts come into the indoor unit and the high voltage wiring should be connected to it then stepped down to lower voltage. It may have a fuse on the circuit board that they blew when installing it. If you are not familar with electrical, I wouldn't attempt to make these repairs. You can look for a small plug in type fuse to see if it blew, it looks like one on your automobile. I would call this installer out and its there job to do this!! These transformers look different, there not all the same, but will have a black and white wire coming in, and several colored wires coming out for low voltage. It will be in the indoor unit. Keep me posted on what you find or if you need more help. How long ago was the unit installed?
Shastalaker7

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1 Answer

230/208 Volt Built-In Room Air Heat/Cool Unit blows cold air, not heat. Unsure if it may be thermostat, if so.. where is it? Another one blew fuse. Where is it located?


To locate the fuse;

1. Turn the power off or unplug the Room Air Heat/Cool unit.
2.Follow the power cord of the unit. This will normally
terminate at the fuse terminal/power reset button., where you can replace the fuse.
3. After the fuse/power reset button terminal the wire
go to a thermostat normally located at the air output
section at the front portion before it goes to the motor
and heating element, while the other wire may connect direct from the fuse terminal to the motor or
heating element.
This is just the basic electrical set up, it can be modi-
fied. Hope this will guide you in locating the fuse and
the thermostat.
fied

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I need to know which wires go into which transformer lead there is a red wire and grey connected together then orange and black together then yellow and black together then black comming from air...


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