One of the most chill, laid back RTU troubleshooting videos I’ve ever seen. I don’t always deal with RTUs so when I get called to one I get a little intimidated. I’d like to be this relaxed with them.
I appreciate this so much , you calmly , precisely basically went and explained everything towards determining the troubleshooting methods and what things do as well as explaining the part what was the issue. As a young technician this video is so helpful and education . You got my subscription 🙏🏾 , keep up the great videos for us young technical entrepreneurs to learn from .
Those are fairly simple to rewire through the safeties back to the contactor coil to get the customer some cooling in the meantime boss Really good find 🙌
this was the most in-depth and informative video i have ever seen over the last 4 years i have been in the trade thank you truly for taking the time to make these videos i found you by accident and truly grateful i did.
Yep on the trane units you have to trace out the wiring because the diagram is always gone just small one little line and it is never the section you are having trouble with
Interesting that the unit can run with the high pressure sensor unplugged. I'd have thought the board would have some type of logic to detect that and fault. Maybe they're not that sophisticated? (coming from a power generation background where we have control units and shit so I'm biased). In any case even if you're not in hvac this is a really good example of how to understand and troubleshoot an electrical control system without a wiring diagram!
Thankyou for the encouragement. Yes the old train units are not sophisticated at all. It's just a daisy chain in which all sensors are connected in series and if the voltage makes it all the way through then the the systems work. And an HVAC there are some systems that are more advanced like you're talking about where the board will actually have to sense each individual lockout switch. Thank you for the comment :)
I would say yes, 1) The unit must be shut down. 2) You cannot let the board touch any metal. I have seen people lay the board on top of the unit, don't do stuff like that. If possible remount it in position. Those circuits in the board can short if they touched any metal, Mounting it up properly before starting is preferable. 3) If you're going to touch metal to the board. Such as a Screwdriver for instance the remove the harness. Just touch The tip of your screwdriver to some random piece of metal. If it has any electrically stored energy it will be dispersed. This is not a big deal but this is how people work on computer circuitry. I would say that's a good start I hope that helps.
Depending on your voltage but in this case I believe yes. It's kind of wonky but for 208 power each leg of a three phase 208 is 120 to ground. But if you take each leg to one another you should get 208. I hope that makes sense
As far as I know there is no like 100% percent method. At least in my experience, I am not the end.All be all over frigeration, so there could be people who are more experienced in controls.That could give better advice. But theway I do it without Swapping A board if that's not available to me. Typically, the owner's manual will have an order of operations.Or if you call the helpline they will tell you the order of operations. For example. This is just an example and does not apply to this train unit.Or any. 1) If the indoor temperature is over seventy five. 2) Refrigeration will turn on. 3) But if it's below seventy outside the economizer will engage. Now let's say if it's 90 degrees outsid. The room inside is 80. And everything is working correctly on the unit but it's not engaging. The fact that it does not complete the order of operations but everything on the unit is working correctly including the t-stat. This would make me take a closer look at the board. I would test the sea if the board was outputting the proper voltage. I would also remove the board and check for corrosion and rust And damage. I hope that's helpful.It's definitely not a hundred percent but it's what I do. God bless
@@La2venida transducers are an electronic device. Senses the pressure, Has to calculate and convert into analog signal, which needs to be processed by a brain (controls). Pressure switch is nothing more than a light switch; pressure simply closes the switch and completes an electric circuit. Electronic and electric are nothing alike. Pressure switch is simply a safety device within a circuit, to protect components such as a compressor. Pressure gets high, high pressure switch opens the electric circuit and nothing works; just like your finger hitting the light switch and the room gets dark. A pressure switch cannot tell you what the pressure is. Transducers are very advanced.
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One of the most chill, laid back RTU troubleshooting videos I’ve ever seen. I don’t always deal with RTUs so when I get called to one I get a little intimidated. I’d like to be this relaxed with them.
Great video you learn a lot by tracing out the wiring in any equipment.
I appreciate this so much , you calmly , precisely basically went and explained everything towards determining the troubleshooting methods and what things do as well as explaining the part what was the issue. As a young technician this video is so helpful and education . You got my subscription 🙏🏾 , keep up the great videos for us young technical entrepreneurs to learn from .
I appreciate RUclips algorithm for this video. I have been looking for one. Amazing step by step troubleshooting video.
Those are fairly simple to rewire through the safeties back to the contactor coil to get the customer some cooling in the meantime boss
Really good find 🙌
Like how you showed where every wire when and how it got its power learnd a lot from you thanks
this was the most in-depth and informative video i have ever seen over the last 4 years i have been in the trade thank you truly for taking the time to make these videos i found you by accident and truly grateful i did.
Thank-you for your kinds words.
I am glad the video helped you !
Amazing job explaining how you go about troubleshooting ac units. ty for sharing this critical knowledge, Keep the videos coming.
Yep on the trane units you have to trace out the wiring because the diagram is always gone just small one little line and it is never the section you are having trouble with
Excellent presentation very helpful and a big thank you 😃👍👍👍💯
Interesting that the unit can run with the high pressure sensor unplugged. I'd have thought the board would have some type of logic to detect that and fault. Maybe they're not that sophisticated? (coming from a power generation background where we have control units and shit so I'm biased). In any case even if you're not in hvac this is a really good example of how to understand and troubleshoot an electrical control system without a wiring diagram!
Thankyou for the encouragement.
Yes the old train units are not sophisticated at all.
It's just a daisy chain in which all sensors are connected in series and if the voltage makes it all the way through then the the systems work.
And an HVAC there are some systems that are more advanced like you're talking about where the board will actually have to sense each individual lockout switch.
Thank you for the comment :)
totally like this video... so well explained so laid back ...totally got to check out your other videos.. God blessings
Thanks, man.I'm glad you found it helpful :)
I'd be lost working on that, great stuff!
Good thorough breakdown.
Great video as always ! I love the longer vids !
Thanks ! 😊
Nothing stops a TRANE, expect a bad control board
I've found the Bob Ross of HVAC 😎👍🏼
🤣 thanks
"Because it's hard to stop a Trane" 😆
Nice one here on Guam, hope u could work on your camera set up
there is no start capacitor for the condenser fan motor. it is a run capacitor .
Thanks for the comment :) didn't know that
Are there any special precautions not to create a short circuit and prevent from damaging the board?
I would say yes,
1) The unit must be shut down.
2) You cannot let the board touch any metal. I have seen people lay the board on top of the unit, don't do stuff like that. If possible remount it in position. Those circuits in the board can short if they touched any metal, Mounting it up properly before starting is preferable.
3) If you're going to touch metal to the board. Such as a Screwdriver for instance the remove the harness. Just touch The tip of your screwdriver to some random piece of metal. If it has any electrically stored energy it will be dispersed. This is not a big deal but this is how people work on computer circuitry.
I would say that's a good start I hope that helps.
Thanks 🙏
You sure did and tank you
Good tech
Very through!
On the contactor, L1 L2 L3, each one should be 120v to ground?
Depending on your voltage but in this case I believe yes.
It's kind of wonky but for 208 power each leg of a three phase 208 is 120 to ground. But if you take each leg to one another you should get 208.
I hope that makes sense
@@gendronhvac-r1269 it absolutely does make sense, thanks brother, I appreciate you
I have one of these I can’t figure out. Thought it was the board didn’t work
I have 5 units just the same they start and stop , short cycles I can’t figure it out?
Did you check pressures?
Short cycling can be a sign of low refrigerant.
Yeah I figure that was the issue. Thank you for answering me. I was about to pull my hair out.
What is the actual method to verify 100% that the board is bad without swapping from another unit?
As far as I know there is no like 100% percent method. At least in my experience, I am not the end.All be all over frigeration, so there could be people who are more experienced in controls.That could give better advice.
But theway I do it without Swapping A board if that's not available to me.
Typically, the owner's manual will have an order of operations.Or if you call the helpline they will tell you the order of operations.
For example. This is just an example and does not apply to this train unit.Or any.
1) If the indoor temperature is over seventy five.
2) Refrigeration will turn on.
3) But if it's below seventy outside the economizer will engage.
Now let's say if it's 90 degrees outsid.
The room inside is 80.
And everything is working correctly on the unit but it's not engaging.
The fact that it does not complete the order of operations but everything on the unit is working correctly including the t-stat. This would make me take a closer look at the board. I would test the sea if the board was outputting the proper voltage. I would also remove the board and check for corrosion and rust And damage.
I hope that's helpful.It's definitely not a hundred percent but it's what I do.
God bless
it is a run capacitor .
Thanks for sharing.
I do not deal with HVAC very much.
It's nice to have people sharing there experience :)
@@gendronhvac-r1269 Other than that very good diagnostic.
not bad except for the camera man,
Rtm boards suck. Had to change out those multiple times.
Those are pressure switches, not transducers.
Thank you for the comment I am terrible with naming things that is definitely a more accurate description
Pressure switches ARE transducers. Gtfo
They are the same. Pressure switches are transducing the psi to a signal?
@@La2venida transducers and switches are far from the same.
@@La2venida transducers are an electronic device. Senses the pressure, Has to calculate and convert into analog signal, which needs to be processed by a brain (controls). Pressure switch is nothing more than a light switch; pressure simply closes the switch and completes an electric circuit. Electronic and electric are nothing alike. Pressure switch is simply a safety device within a circuit, to protect components such as a compressor. Pressure gets high, high pressure switch opens the electric circuit and nothing works; just like your finger hitting the light switch and the room gets dark. A pressure switch cannot tell you what the pressure is. Transducers are very advanced.