Carrier CLO (Current or Compressor Lock Out Board) explained. 

Thank you, this video is great, and the diagram being drawn out is absolutely amazing, so helpful

Hi, SLC. TB here. The most frequent cause of the CLO locking out the compressor is when the LP switch opens during a low ambient startup on units without a working economizer. Carrier had a timer kit that could be installed to bridge the LP switch until pressures could rise enough that the LP would stay closed. We found we could make our own bypass. Of course, I have found the compressor conductor removed from the sensing loop and terminals 2 and 3 jumpered together by others... which is not the right approach to that issue. When they place that jumper, they lose the protection the safeties provide, including the HP switch and the freeze stat. The purpose of the board is to not allow the contactor to ride on the safeties, opening and closing repeatedly when there is a problem. This way, the tech can know that an issue exists, and then investigate the issue, and the contactor can have a much longer lifespan, along with the compressor. That's a very good explanation of the way it works, too.

Thanks a lot SLC tech for clarifying things for me. Never knew how it actually worked. Great teacher!

Finally, found what I was looking for. Thank you! Just to understand the way the climate control board works on a condenser.

Great video. On some of the (older?) carrier units these are in, the larger Carlyle compressors have a internal protector in 24v series with the LP, HP, FP.

This made my day. Thanks for your very clear explanation.

Great explanation! I ran into 1 today not knowing what it was. Now I do. Thanks!

Thanks for sharing this information it really helped me understand what is happening to the unit I am working on

Thank you, thank you.....SLC TECH😀😀😀😀. I had been searching for this circuitry and explanation for a while. I was so happy to came across your channel and VOILA!!!! there she is hehehe. The best ClO explanation of what it does and how it operates. BTW , Thanks for the wiring diagram. God bless you and your family.

Holy crap I just had a issue with this today and I’m not a carrier tech but this board through me a loop , didn’t know exactly what the board does but now I think I know what’s wrong

Thank you for explaining. It now makes sense to me now🙏

Hello SLC Tech Yesterday I was working on one of the Carrier Horizontal units with a Current Sensing Board. It was my first time troubleshooting one of these boards. I suspected it had something to do with the amp draw because my compressor was drawing too much amp and it was shutting down on LRA Locl Rotor Amp. When I removed the common wire on the board and contactor will energize try to start the compressor but it will fail on LRA. Thank you for clarifying. Great educational video.

Great explanation 👌

Thank you for explaining this.

great explanation / concept

Thank you sooo much. My air con does not recover after power outages, until I manually reset the thermostat, sometimes I have to turn off the breaker.

Amazing video I understand every thing about this lock out Realy in only 8:45 mint thanks

Great video, very illustrated 👏👍🏻

Thank you for this video, by any chance are you familiar with the blue control boards with the CLO moles plug intertwined with the main board itself? And if the CLO trips would the condenser fan motor stay running without the compressor?

Great video very informative need more on wiring

Thank you so much

TY , For this. So if I measure 24 volts at terminal X that means the board is in Lockout due to a low current at the compressor? Other than that X terminal should not read any Voltage in normal operation operation.

Very good example sir thanks

Great explanation. Thank you

Yor explain it really amazing thanu kindly make a video like this on pc board of trane package

Good ✔👍

Thanks .its helps alot🤩

Thanks sir good information and nice explanation sir i have one question plz show me high amp auto cutoff circuit board so we can protect compressor from high current plz sir

Good message sir thanks

Thanks, had that issue today

Now i know how it works what is its main purpose of the CLO . To detect any fault that stops current in winding and require a power cycle to reset ??

Sir please one video make on Emerson ICM-220 lock out relay Waring cannection.

Also very good diagram

One more thing to add: can I temporarily eliminate this board once I determined it defective ? New board take a week @ the supply house. Thank you. Sir

Good job sir

THANKS !!

What if it's a 2 stage and both have clo, they are in series. If second stage drops off then itll trigger the clo right?

Alguien me puede traducir al español está explicación?? Gracias

great

Sir voice not clear

OK

Dude, you didn’t mention that it won’t start up if it senses current when not calling, not so needed with this but the older ones people try to jump out