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How can I tell if my condenser/compressor is not working? Lennox 10ACC03623

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TGrayson

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Hey Guys,
I haven't been here in a while, but it's good to see some familiar names!

I have a Lennox 10ACC−036−230, last night I noticed that the air coming out of the vents was a little warm & I also noticed a loud screeching sound coming from the unit outside. It also sounded like the condenser fan was not turning. So I immediately shut the system off by the thermostat. I have had problems with the fan in the past which had been resolved by replacing the capacitor and oiling the fan shaft with Zoom oil. The system has also had a slow refrigerant leak so at the start of the season (within the last month) I again oiled the fan and also recharged the system with approx. 2 lbs. of R22. I was not able to go outside to physically check the unit tonight because it was dark and it was raining quite a bit (I know waa!). I plan to check it first thing in the morning.

I am concerned that it might have over-heated the compressor since it was blowing warm air out of the return vents/registers. How can I tell if the compressor is working properly? I know how to check the fan but I don't want to replace the fan not knowing if the compressor was damaged.

Thanks for your help!
 
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TGrayson

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There is a breaker box outside by the unit with a handle to pull out to shut off power to it.
 

TGrayson

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Ok, I just went outside to check it out. The fan motor was able to spin freely. I oiled the fan shaft again. I had an extra capacitor so I swapped it out, it's 7.5 MFD, 440 VAC (several yrs ago a tech replaced a dual w/2 singles). I turned it on and it started right up. There is cool air coming out of the vents now but the fan motor does sound a little louder than normal & a high pitch squeal can be heard in the background noise, but nothing like it sounded last night.

I am letting it run for a little bit while keeping a close eye on it. Do you think the fan motor could be going bad? I do you an account with Grainger so I can pick up a new fan motor there for about $75 if it is absolutely necessary.

Thanks for your help!
 

TGrayson

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OK, new update. It happened again. The fan stops spinning and there is a loud screeching sound and when I turn it off the screeching wines down slowly like the motor is spinning to a stop but the fan blade is not spinning, I am not sure if this has anything to do with it but both times the fan motor has stopped working is when it was raining.

The new motor that I am looking to buy is Dayton Condenser Fan Motor, 1/3 HP, 1075 rpm, 60Hz and requires a run capacitor, 7.5 MFD, 370 VAC. I have a fairly new 7.5 MFD with 440 VAC do you think I could use that one on the new motor or should I get a new cap w/new motor? Also the compressor has a separate cap on it, it's 50 MFD with 440 VAC, so I get a dual to cover both? A service tech a few years back replaced a dual with two singles (I guess b/c he didn't have a dual w/him).

I would like to buy the new motor tomorrow, Wednesday because it is going to be about 95 degrees here. So any advice would be greatly appreciated!!

Thanks again!
 

kok328

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TGrayson

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Ok I ordered the new fan motor & am getting ready to go pick it up. Please see previous post for CAP details because I ordered the 7.5 mfd, 440 vac but it apparently is backordered. I would like to install a new cap with the new fan can I use the 7.5 mfd, 370 vac with the compressor cap 50 mfd, 440 vac because they are connected with a jumper? Please see pic below:

 

kok328

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Use the recommended rated cap for both the blower motor & compressor.
They will be different per manufacturer and that's why I sugessted using separate caps on this repair.
You can't always go by what someone else put in there versus what is suppose to be in there.
For the new motor, it will tell you what cap rating you need. For the compressor, you may have to see what is printed on the compressor nameplate.
 

TGrayson

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OK! Thanks again. I am going to pick it up right now. Like i said, they didn't have the 7.5 mfd, 440 vac anyway. I just wasn't sure if I could connect the 2 different vac's together.
 

kok328

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For the motor you have chosen you will need a Motor Run Capacitor, 7.5 MFD Rating, 370 Voltage.
 

TGrayson

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HELP! LOL. My old fan had 3 wires Black, Orange & Purple. The new motor has 4 wires plus ground. Black, Purple, Brown & Brown with white stripe. The 2 brown have connectors but the black and purple do not. I am going to store to get the connectors for the 2 that don't have them. I am planning to plug the new purple where the old purple was and the new black where the old black was. Then should I plug the brown where the orange was and not use the brown w/ brown stripe? It did not have a wiring diagram with new motor. My unit has diagram with black, orange and purple.

Thanks for your help! I am in deep and would like to finish tonight.
 

kok328

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Look at the motor's nameplate, it will show you how to wire it up 3 or 4 wire.
Also, don't forget the verify the proper rotation of the motor and set the windings accordingly.
 

TGrayson

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Thanks. I didn't even think to look at the label/nameplate. But it did get it to work and it sounds great! It's just not rotating in the right direction. It should turn CW but it is going CCW. This fan has the option to go both directions. Before I had cut off the shaft, I tested it to see if it was going in the right direction, it wasn't so I swapped out the solid brown wire for the brown w/ white stripe and I could have sworn it went CW! So I cut the shaft down, adjusted the mounting screws, set the ground wire (which the old fan did not have) and zip tied everything nice and neat and tested it before I set it back over the compressor & it went CCW!? By that time it was dark and I was probably hallucinating by that point so I closed it up and will try again in the morning.

I will look at the nameplate in the morning & I hope it tells me how to get it to go CW. There is a wire harness connector that comes out of the side separate from the other wires, kind of like a loop-back it's white and black wires, I wonder if that somehow has something to do with the rotating direction?

Well thanks for all your help. I hope I can get it to rotate properly in the morning it's suppose to be 95 here on Wednesday.
 

kok328

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That wire harness is what changes the rotation of the motor.
Change the orientation of the harness to achieve these results:
From the shaft end, CW rotation is set by Purple to purple & yellow to yellow.
From the shaft end, CCW rotation is set by Yellow to purple & Purple to yellow.
 

TGrayson

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Yes you are absolutely correct!! The first thing I checked was the nameplate and it said exactly that! I just had to pull it apart & switch it from black-black & white-white for CCW to black-white & white-black for CW! :) All the other wires I had connected were correct according to the nameplate.

Thanks for ALL of your help! I saved about $700+ by doing it myself.

Another successful outcome with help from kok328!!
 

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