Question about Mitsubishi Mr. Slim MXZ30TN Air Conditioner

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A/C stopped working because contactor melted, new con. installed

Model BFDL301H Mitsubishi (20yrs old) we need a new wiring diagram, appears that thermo overload relay is faulty, where to purchase in Adelaide S.Australia Please?

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  • lnejedlik Jan 30, 2009

    the air con is not Mr Slim it is a heavy industry Mitsubishi a/c unit


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No we did not solve, also we do not have your slim a/c but an old outside model as above.
sorry if I have filed in the wrong box for help.

Posted on Jan 30, 2009

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Wiring- Connecting wiring on replaced fan motor

Your new fan motor should have a diagram with it or at least printed on the side of the motor, that will help a lot from your end. As for me, I don't know what unit you have, so I will try to help you with just the basics.

Your old motor probably had 3 wires. One went to the contactor, that is the "Line Voltage", one went to the Common terminal on the old capacitor (COM), that's the other "Line Voltage" wire, and the last one went to the "FAN" terminal on the old capacitor. The reason the old capacitor looks different is because it works for both the compressor and the fan motor (split capacitor). You still need this hooked up for the compressor to work.

The new fan motor.
These vary in brands and wiring so I can not tell you the colors without knowing exactly which motor you have. On the new motor wiring diagram, you should see the "Line Voltage" as described above that 2 of the wires are ran to each other (just on the diagram, not wired together on the unit). This is your power wire that goes to the contactor on the unit, usually black, and your Common wire that runs to the capacitor. You can still run this wire (COM) to the common terminal on the old capacitor since you still have to use the old capacitor for the compressor and the common terminal should still be jumper-ed from the contactor to the (COM) terminal. Then you will probably have 2 wires for the new capacitor, usually Brown and Brown/White. These wires run to each side of the new capacitor and doesn't matter which terminal. Then you will take a new jumper wire from the (COM) terminal on the old capacitor to the terminal on the new capacitor that has your Brown/White lead. Make sure you secure the capacitors inside the unit so not to touch anything surrounding them. Your new motor might also be a "Reversible" motor that has reversing wires also. Again, your new motor diagram can tell you how to hook these up. You have to have it spinning the right way, most of the time it is CCW (counter-clockwise).

I'm sorry I can't be any clearer on this, but without knowing the brands, models, etc, I'm in the dark. If you need any additional help, I would be glad to help! Good luck and hope you get to cooler days!

Jun 28, 2012 | Heating & Cooling

3 Answers

Heil outside fan motor 3 wire rd/blk/br new dayton motor 4 wire blk /br /purpule /brown with white strip Need help on wiring

Hi, the new motor takes its own capacitor to run it. This is what the 2- brown wires are for, one will have a white stripe. You will need to but a seperate run capacitor for this motor, a 5 uf, 7.5, or what ever it calls for. they should have told you when you bought the motor. It will have to spade connectors on it where the brown wires connect alone. Use the dual capacitor if that is what you have for the other 220 volt wires.Black and purple will be your 2 hot wires.You can connect either one to the old capacitor on the fan terminal and the other to the load side of the contactor, so when the contactor closes it will energize the motor.Or, take both the black and the purple wires and to the load side ( outlet side ) of the contactor, connect one to one side and the other to the other side. The line side is where your 2 hot wires that connect to the contactor from the incoming wires from the electrical box, you want to be on the other end. I would connect the black to the contactor load side and purple to the old capacitor as long as the old wiring is still on it as it has to be fed by a hot wire from the contactor. Each wire, blk, and purple has to have 120 volts to each one and you can get this a couple of ways. The contactor has several terminals that are not used and if you wire them on the outlet side, they will only be energized when the contactor is closed on a call from the stat, very easy to do. You will have to get a coulple of crimp on connectors to put on the ends of the wires, but the brown ones should already have them for this capacitor. Do not try to put the brown wires on the old run capacitor as you will burn out the new motor! Go get the small run cap for these 2 wires for about $10. I know that you can do this wiring change just remember the blk is hot 120, and purple is hot 120, = 240.volts. If you have removed all of the wires from the old capacitor, then use the contactor to connect to. The compressor wires must stay on the old run cap on the hermetic side and this old cap. must be fed by a hot wire from the contactor to the common terminal, that is marked with a C..If you look at the new motor diagram, it will show you also. Please dont forget to rate me as I know you will be kind, and I will check in on you to see how you are doing. Get this capacitor and it will run. This is a must!! Please keep me posted.
A/C, Heating, & Refrigeration Contractor

Sep 07, 2010 | Goodman CLQ36AR49 Air Conditioner

1 Answer

Not sure need a diagram for payne 2 ton or 21/2 ton yac108c. The service techs tore it off need it to install a blow motor.

Actually you can change it without the diagram. Simply cut the wires on the motor and leave the terminal ends attached to both the contactor terminals, and possibly the cpacitor if present. Then install your new fan motor replacing the leads from the old one with the leads from the new one.

But if the new motor has different colored leads, usually the brown leads are attached to the capacitor (it doesn't matter which terminal the leads go to, as long as there are only two leads and it is just the fan's capacitor). And then attach the other two leads to where the other two old leads are. (Naturally removing or swapping new wires to where old ones were.)

Sep 03, 2010 | Heating & Cooling

1 Answer

The unit will not start for the summer. It worked last summer.

Open the control box and see if you have around 220-240V at the bottom of the contactor. The contactor is the switch looking thing in the bottom. If the unit is calling for air it should have a button in the middle that is pulled in. If you are not getting the volts at the contactor then you need to find the electrical problem.
If you have the correct voltage then look and see if the contactor is connected. The middle button should be pulled in. If you have one where you are unable to see the button, or it is not pulled in, Check the low voltage wiring. This is done by checking to see if there are 24V-28V on the side terminals of the contatcor. These terminals are located on the sides of the contactor. (some contactors have both sides of the 24V on one side.) Either way you should read 24-28V when checking across the two terminals. If you do not then you have a problem with the control wiring. (cut with weed eater, chewed by mouse etc.) I know the 24V coil is good because the inside unit is running. If the contactor is pulled in and the outdoor unit still does not run check and see if there is power at the other end of the contactor. (The end the switch breaks off)
If the switch is pulled in (or you read 24- 28V on the side of the contactor, and there is 240 V coming in on the line. Chances are you need to replace the contactor. Disconnect the power and pull one wire at a time of of the old contactor and install it on the new. After all of the wires are on the new one, remove the old contactor and throw it away. Screw the new contactor with all of the wires back onto the unit. restore power. Often times in our part of the country, there will be ants stuck in the points of the contactor. Just cleaning the contactor will buy more time.
Hope this helps.

Jul 11, 2010 | Carrier 38CKC024 Air Conditioner

1 Answer

On outside compressor for whole house AC: Critters ate wires. Have Blk & Red power in from breaker. 24vac switched from thermostat. 1 contactor with 24vac coil(original). 1 Capacitor w/ 3 terms...

There should be a wiring diagram on the back of the access panel. If you can't read it, check online for model wiring diagram. Don't guess, you may cause more expensive damage.

Jun 25, 2009 | Heating & Cooling

1 Answer

My outside a/c unit fan stopped working. When I

By saying the condenser fan is not working as well, I have to ask is the contactor making any kind of noise?. If the contactor is not making noise, look for some smaller wires going to the contactor. These are the low voltage wires that send 24 volts to the contactor. Make sure the thermostat is turned on, set it for a temperature lower than the current room temperature. Are you getting voltage to the contactor? If the answer is no check the W wire at the air handler and at the thermostat. The G wire runs the inside blower only. This is why you can put the fan in the ON position and not have the compressor running all the time. If you are getting voltage at the contactor turn the power back on at the compressor, take a sturdy insultaded rod, very dry wood or plastic remember electricity can kill damp wood can conduct electricity. Look for a small bump in the center of the contactor. Press it with the rod and see if the compressor turns on. If it turns on when you press this point on the contactor and off when you release it then the low voltage side of the the contractor is bad. If the bump is pulled in and the unit is not running take the multimeter and carefully check to see if your are getting 240 volts across the two bottom connections and then 240 volts across the top of the connections. If you are getting 240 volts on one side only the the contactor is bad and you need a new one. Turn off ALL POWER this is the breakers for both the compressor and the furnace. Again make sure the power is off. Make a diagram of the wire positions, then disconnect them. Remove the contactor and take it to an electrical supplier or an HVAC parts supplier and get a new one. Reinstall it and reconnect the wires. Turn the power back on and everything should be working again.
Good Luck

Jun 15, 2009 | Ruud UBHC Air Conditioner

1 Answer

Hi my name is adriana and I was wondering if you have the mitsubishi daiya packaged air con. My problem is that our remote control is not working cos the remote melted on the canara, which the back of it...

Have you tried calling the manufacturer at 800-332-2119 to get a new remote yet? If they don't have one, then a supplier should and I can get a number or website for you but Mitsubishi should have one.


Mar 20, 2009 | Mitsubishi MS-A09WA Split System Air...

1 Answer

I am a ac tech, and i was working on a old carrier unit, wich had no schematic diagram. I need it in order to get the compressors going. if i give you a model # can you please provide one. roof top ac...

you aren't an ac tech number one but i shall overlook that . your question is llike will the sun come up in the north or the south tomorrow. obviously in the east as it has since the earth was created. anyway. all compressors since the beginning of time wire up the same .a wire commonly referred to as the common goes from the contactor to the compressor. usually black in color, hence the old coloqualism Blacks are common. the run wire is from the contactor to the run side of the run capacitor or from the contactor to the run connection on the compressor. hence the old slogan reds run when you point a gun at them. the only wire left is the start wire that come from the start capacitor and is usually yellow . hence the old saying blacks are common, reds run, and yellows are always starting something. very ethnic i know but thats how i was that the wirings correct check to see volts through contactor are correct and if one side of contactor is not feeding. if volts good then check capacitors with a cap checker. if all else looks good kill power and inspect compressor terminals at compressor. if burned off consider a termilock kit good luck..

Jul 19, 2008 | Goodman CLQ36AR49 Air Conditioner

1 Answer

Carrier A/C units

Double check that the new contactor has the same electrical ratings on it. My guess is that the coil should be 24v while the relay should be able to carry the same amperage at 220v.

First shut off the breaker and disconnect switch for the furnace and outdoor condenser and call a licensed HVAC contractor:)

If you are determined to do it yourself, Then read the schematics first. Be aware, if you mis wire the system you may cause more damage than you have now. Not to mention your personal safety is at risk.

I am basing this on the most common style contactor found in my area.

The main relay side should be labeled. (eg. L1,L2-T1, T2). These should match exactly like the old one. L1 and L2 are the incoming power. T1 and T2 are the power leaving the contactor. All the 220v wires should correspond to one of these four terminals either by screwing them down or fitting the spade connectors together.

Usually the 24v wires will plug onto the coil (near the bottom, left and/or right sides of the contactor) silver spade connectors.

(STEP 1.) Leave all Wires Connected to your Old Contactor.
(STEP 2.) Remove the two mounting screws that hold the Old Contactor to the Air Conditioners casing.
(STEP 3.) Now Install the New Contactor to the old contactors existing location using the Same two Screws.
(STEP 4.) Now take Off one wire at a time from your old Contactor and Install each wire one at a time to the proper location on the new Contactor.

Jun 24, 2008 | Carrier 38CKC042 Air Conditioner

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