Tool List- www.amazon.com/shop/acservicetech Support- www.patreon.com/acservicetech For those that are looking for the tools used in the videos: (Linked Below) Here is a link to the UEI DL389 Multimeter used in the videos- amzn.to/2av8s3q Here is the link to the Fieldpiece SDMN6 Dual Pressure Testing Manometer with Pump-amzn.to/2jyK5Ka Here is a link for the Supco Magnet Jumpers amzn.to/2gS4h6z Here is the link for the Irwin Wire Stripper/Cutter/Crimper amzn.to/2dGTj2V Other tool links can be found in the video description section. ACSERVICETECH is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com.
Watching these videos is like binge watching a great series on Netflix. Some nights I have to watch 4 or 5 of these videos before bed. Thank you for time and efforts.
You did a good job showing us how to test the sensor and limit switch, a lot of people have a hard time reading the schematic diagram, I'm one of them.
Thank you very much for that video, one of the things I struggle with is looking at a wiring diagram and the actual unit and figuring out where the wires go. Been in the field 6.months as a Lab technician
Thank you so much for taking the time and energy to make your videos. I'm just a diy guy but enjoy learning as much as possible. You're excellent at explaining how to troubleshoot quickly and safely and I can't thank you enough!
I must say you do a great job with position of your camera. I've watched a lot of videos where they are talking, but you can't see what they are doing. Awesome video and I just liked and subscribed. Thank you.
I have one more request if I may, Just a short video about trouble shooting reversing valves, diagnostics from the stat through the board to the 24 volts and to the valve, if you could ..then I think you have covered everyone of my weaknesses sir... thank you my brother...
Robert thank you for letting me know what you would like to see in the future. I am glad to hear that these videos are helping solidify things for you!
Thank u sir. It will be very interesting to have deep explanations of the functionning of the Control Board, explanation based on the schematic diagram of the PCB! WHY NO ONE GO INSIDE IT?????0!!!!!. Because since we understand the functionning of this one then we have just to follow the IN/OUT of it to find out everything inside the furnace!!
Great video;As this from a training perspective ,and safety is a lead by example educational guide.Perhaps as in your other videos you should be wearing your "safety" wedding band.
Great explanation! I always learn something from your videos. I'm trying to improve on reading schematics. I'm starting to do commercial work & get confused on some of those schematics
Good explanations and demos. It would be nice if the schematics were easier to read on youtube. Maybe a pdf that you could pan and zoom as you went through it. Thanks
Loving the videos acservicetech!! I know you were just showing us how to troubleshoot with using the control board (your example: COM to one terminal of the switch)... but my question is, can you also check for a voltage reading without using the control board by going across the switch's two terminals with the meter probes?
You could test the switch with the wires disconnected with resistance that way. You need a common and a hot to read voltage though. This will give you the most certain answer, thanks Jay!
Oooou quick reply, thanks acservicetech. But I know you can test resistance across the switch with the wires disconnected. I guess what I was trying to ask was, can a short circuit result when testing for voltage across the switch?
A short circuit usually means a direct connection between hot and common. I always test with a ground or a common for accuracy in being able to tell what is going on since that will be the path back to the breaker anyway, thanks Jay
acservicetech Now I need to go to the book I got in school and read through again why these safety switches would trip. I know you mentioned the cracked heat exchanger but I am sure there are numerous other reasons also.
Next time you are near a furnace, open the door and look at the limit circuit fault code and look at what is says could be the problem for an open limit wire as well.
So if your troubleshooting, what’s the side to go on connection side or wiring diagram? Is there a rule you go by as to what’s the problem with the unit? Not cooling, where would you start?
No cooling, it would depend on if it sounds electrical, airflow or refrigerant charge from what the homeowner says. Typically start with filter and airflow first and then second, turn the outdoor disconnect off. Then turn tstat on cooling and get fan running in high cooling speed. Hook manifold gauges or quick connect test gauges up. Turn disconnect on while you are standing in front of the outdoor unit to listen if there is a problem, go from there. In reference to wiring diagrams, schematic tells you how it works while connection tells what wire goes where, thanks!
Hi, at the end of the video at time [17min.] the voltage between R and C was reading 14 volts, with limit disconnected. Why did'nt it read 0 volts, since the limit was disconnected. THANKS FRIEND [ ALSO] do you have a video on troubleshooting the IFC or control board? I could,nt find on your site.
Great Question! There is voltage on the board backfeeding to the R but the board was still able to limit this down to 14 so it would not provide power to turn on a thermostat or to be the correct voltage if R was connected to W on the board. If this was just wires and you broke the circuit then you would just get 0 like you were saying. Thanks So we usually troubleshoot a board by knowing what everything else does and when we should have voltage coming off the board at a certain spot. It is the last thing left if we are certain about everything else. Interesting concept, I eventually should make a video about that concept and how to know if the board is bad for certain. Thanks
Hi Craig...you are truly an asset to have. This was all great, but wanted to ask; after the transformer...where does the 24 volts go to on the board...I thought 24 v was suppose to be present and coming from those terminals that would feed the circuit of operation waiting for a call for heat initiated by the Thermostat !! Thanks
It may be applying power to one item and sending signal voltage to another. After signal voltage goes through a switch, it will come back to a dedicated spot on the board unlike an item being powered which comes back on common, thanks
Hi , is there any other sources/websites i can go to to download the schematics of my HVAC , i try the manufacturer's (Trane) website , but no information there , the schematics on my HVAC's panel washed out badly. Thanks a lot.
Tool List- www.amazon.com/shop/acservicetech
Support- www.patreon.com/acservicetech
For those that are looking for the tools used in the videos: (Linked Below)
Here is a link to the UEI DL389 Multimeter used in the videos- amzn.to/2av8s3q
Here is the link to the Fieldpiece SDMN6 Dual Pressure Testing Manometer with Pump-amzn.to/2jyK5Ka
Here is a link for the Supco Magnet Jumpers amzn.to/2gS4h6z
Here is the link for the Irwin Wire Stripper/Cutter/Crimper amzn.to/2dGTj2V
Other tool links can be found in the video description section. ACSERVICETECH is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com.
Watching these videos is like binge watching a great series on Netflix. Some nights I have to watch 4 or 5 of these videos before bed. Thank you for time and efforts.
Ha ha, thats awesome! Sorry about the banging at the beginning of the earlier videos!
Im currently in school for HVAC. Your videos are definitely a huge help in putting the knowledge learned, in to a much better perspective!
You did a good job showing us how to test the sensor and limit switch, a lot of people have a hard time reading the schematic diagram, I'm one of them.
Thank you Rami Hawari!
The beauty of hvac glad i picked this trade changed my life
Thank you very much for that video, one of the things I struggle with is looking at a wiring diagram and the actual unit and figuring out where the wires go. Been in the field 6.months as a Lab technician
Thank you so much for taking the time and energy to make your videos. I'm just a diy guy but enjoy learning as much as possible. You're excellent at explaining how to troubleshoot quickly and safely and I can't thank you enough!
Thanks Dmenace12483!
I must say you do a great job with position of your camera. I've watched a lot of videos where they are talking, but you can't see what they are doing. Awesome video and I just liked and subscribed. Thank you.
Thanks a lot Sean!
Great combo of schematic and real-world wiring! Thanks, Craig!
Thanks Jack!
I have one more request if I may, Just a short video about trouble shooting reversing valves, diagnostics from the stat through the board to the 24 volts and to the valve, if you could ..then I think you have covered everyone of my weaknesses sir... thank you my brother...
Robert thank you for letting me know what you would like to see in the future. I am glad to hear that these videos are helping solidify things for you!
acservicetech. did you make this video.
man you help so many people ! god will bless and repay your kindness!
Thank you very much megawhitesox05! May the Lord Bless you too!
ditto
Thank u sir. It will be very interesting to have deep explanations of the functionning of the Control Board, explanation based on the schematic diagram of the PCB! WHY NO ONE GO INSIDE IT?????0!!!!!. Because since we understand the functionning of this one then we have just to follow the IN/OUT of it to find out everything inside the furnace!!
Great video;As this from a training perspective ,and safety is a lead by example educational guide.Perhaps as in your other videos you should be wearing your "safety" wedding band.
the reason i ask this is that i live in central fla. and that is realy the only heat that we need. thanx again
Yeah I realize you guys are not running furnaces down south in Florida so the more knowledge on the Reversing Valve the better. Thanks
Great explanation! I always learn something from your videos. I'm trying to improve on reading schematics. I'm starting to do commercial work & get confused on some of those schematics
Got ya!
your videos help me so much! thank you
Glad you like them!
Very informative! Is there an updated version of this video that has better lighting and up close? Thank you in advance!
this was a very good video showing troubleshooting please do more like this thanks
Thanks for letting me know Karen!
Hello, when testing the high limit switch, you should explain the you reconnected the first switch you troubleshooted....because they are in series.
Thanks Keith!
This man is a damn genius
Good explanations and demos. It would be nice if the schematics were easier to read on youtube. Maybe a pdf that you could pan and zoom as you went through it. Thanks
Thank you RJParker, good ideas!
THANK YOU .SO .SO . MUCH FOR Your Times to make this video
Thanks LUONG LY!
That is exactly what happened to me today!
Loving the videos acservicetech!! I know you were just showing us how to troubleshoot with using the control board (your example: COM to one terminal of the switch)... but my question is, can you also check for a voltage reading without using the control board by going across the switch's two terminals with the meter probes?
You could test the switch with the wires disconnected with resistance that way. You need a common and a hot to read voltage though. This will give you the most certain answer, thanks Jay!
Oooou quick reply, thanks acservicetech. But I know you can test resistance across the switch with the wires disconnected. I guess what I was trying to ask was, can a short circuit result when testing for voltage across the switch?
A short circuit usually means a direct connection between hot and common. I always test with a ground or a common for accuracy in being able to tell what is going on since that will be the path back to the breaker anyway, thanks Jay
Acservicetech thanks
Thanks again!
Glad to help!
Good stuff. Thanks
Yes this is perfect thank you! 👍
Glad to help David!
acservicetech Now I need to go to the book I got in school and read through again why these safety switches would trip. I know you mentioned the cracked heat exchanger but I am sure there are numerous other reasons also.
Next time you are near a furnace, open the door and look at the limit circuit fault code and look at what is says could be the problem for an open limit wire as well.
acservicetech you should do online school training. I would definitely sign up.
Thanks David! That would be a little much for me at this point but maybe in the future.
Good, solid training info. Well done - thanks.
Thank you!
Great explanation thank you!!!
Thanks jimmy ung!
this helped alot!! thanks
Thanks Jason!
So if your troubleshooting, what’s the side to go on connection side or wiring diagram? Is there a rule you go by as to what’s the problem with the unit? Not cooling, where would you start?
No cooling, it would depend on if it sounds electrical, airflow or refrigerant charge from what the homeowner says. Typically start with filter and airflow first and then second, turn the outdoor disconnect off. Then turn tstat on cooling and get fan running in high cooling speed. Hook manifold gauges or quick connect test gauges up. Turn disconnect on while you are standing in front of the outdoor unit to listen if there is a problem, go from there. In reference to wiring diagrams, schematic tells you how it works while connection tells what wire goes where, thanks!
Good deal. Good info.
Thanks Robert!
Hi. Would you please let me know what type of electrical wires and what gauge to use when replacing them in case they are damaged? Thanks!
14 gauge is good for 15 amps, 12 gauge is good for 20 amps, check the max fuse or max breaker size listed on the rating plate of the unit, thanks
thanks for the great video
Thanks Juan!
I start school for HVAC Technician on Jan 18th in 17 days and this looks a little difficult
Do you have a book that teaches how to read schematics?
Hi, at the end of the video at time [17min.] the voltage between R and C was reading 14 volts, with limit disconnected. Why did'nt it read 0 volts, since the limit was disconnected. THANKS FRIEND [ ALSO] do you have a video on troubleshooting the IFC or control board? I could,nt find on your site.
Great Question! There is voltage on the board backfeeding to the R but the board was still able to limit this down to 14 so it would not provide power to turn on a thermostat or to be the correct voltage if R was connected to W on the board. If this was just wires and you broke the circuit then you would just get 0 like you were saying. Thanks So we usually troubleshoot a board by knowing what everything else does and when we should have voltage coming off the board at a certain spot. It is the last thing left if we are certain about everything else. Interesting concept, I eventually should make a video about that concept and how to know if the board is bad for certain. Thanks
yeah woo hoo!!! nice nice thank you for the video....😃😃
I was thinking of ya!
Fucking love your channel dude. Thanks for spending the time to make your videos. They're all great
Ha ha, thanks Brandon!
Hi Craig...you are truly an asset to have. This was all great, but wanted to ask; after the transformer...where does the 24 volts go to on the board...I thought 24 v was suppose to be present and coming from those terminals that would feed the circuit of operation waiting for a call for heat initiated by the Thermostat !! Thanks
They go through the fuse and then to those limit circuits to check for safety before going to the board at R and C, thanks
In some parts of circuit there are 2 wires in parallel such as at the fuse or into the transformer. The wires run side by side. Why is that ?
It may be applying power to one item and sending signal voltage to another. After signal voltage goes through a switch, it will come back to a dedicated spot on the board unlike an item being powered which comes back on common, thanks
Hi , is there any other sources/websites i can go to to download the schematics of my HVAC , i try the manufacturer's (Trane) website , but no information there , the schematics on my HVAC's panel washed out badly. Thanks a lot.
Really the best bet is just googling it with the specific model number, thanks
OK , Thanks for the reply, watching your videos really help.
What if there is no schematic or diagram? Who to call to provide the diagram?
You could look up that model # right through google and possibly find it. You could contact the manufacturer, thanks!
where do i get that magnet from?
That actually came out of the magnetron from a junk microwave. You get two from each microwave. Otherwise, you would just buy a neodymium one, thanks
info was good but I couldn't close enough.
Got it, thanks Zamar!
Aha 🧐👌🏼
Thanks Brooklyn Droner!
I think I have ADHD
Diagram is too small.
Yes I am planning to draw out some larger circuits to go over. That was just the wiring diagram on the furnace, thanks!