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?
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.
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.
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.
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.
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
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, 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.
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
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
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?
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 TB. Hope all is well with you, loving my new gig in the private industrial side of things.
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.
Thank you, this video is great, and the diagram being drawn out is absolutely amazing, so helpful
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.
Finally, found what I was looking for. Thank you! Just to understand the way the climate control board works on a condenser.
Thanks a lot SLC tech for clarifying things for me. Never knew how it actually worked. Great teacher!
Great explanation 👌
Thank you so much
great explanation / concept
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.
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
Good ✔👍
Great explanation! I ran into 1 today not knowing what it was. Now I do. Thanks!
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
Thanks for sharing this information it really helped me understand what is happening to the unit I am working on
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.
Yor explain it really amazing thanu kindly make a video like this on pc board of trane package
Alguien me puede traducir al español está explicación?? Gracias
This made my day. Thanks for your very clear explanation.
Sir please one video make on Emerson ICM-220 lock out relay Waring cannection.
Amazing video I understand every thing about this lock out Realy in only 8:45 mint thanks
Good message sir thanks
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.
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 ??
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
Thank you for explaining this.
Very good example sir thanks
Thank you for explaining. It now makes sense to me now🙏
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?
Nevermind, if the y de-energizes and energizes itll reset that board like you stated.
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
It is actually pretty rare for the board to fail. It can happen, but I encourage techs to exhaust all other avenues, first.
Sir voice not clear
Great video, very illustrated 👏👍🏻
Great explanation. Thank you
Thanks .its helps alot🤩
Great video very informative need more on wiring
Thanks, had that issue today
Also very good diagram
OK
Good job sir
THANKS !!
great