CARRIER AC WITH A BLOWN FUSE
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- čas přidán 26. 08. 2024
- This was a service call on a Carrier Ac with a blown fuse, I found that the unit had a bad disconnect switch and the condenser fins were so bent up it was causing high head pressure. I replaced the disconnect and got the unit operating properly again.
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Here's a tip. Cut open any blown fuse you have with a tube cutter. If your fuse element is still visible but open in one tiny spot, that indicates an overamp on that leg of power.(i.e. seized fan motor, seized compressor, bad bearings). If the element is completely annihilated inside and not visible at all, that will be a short. Almost always a short to ground. (I.e. wire rubbed out, grounded compressor. 2 minutes to inspect a fuse on a call can zero you in on your problem and make you more $$$$. Stay safe out there fellas
Thanks bud I will try that!
Interesting!
Thank you Matt! I'm looking forward to trying this!
Your troubleshooting skills are amazing. I’m not an HVAC tech but learn from you and admire your skill and work ethic.
Is it bad that every video I watch of yours I fall more and more in love with HVAC, and I haven’t even started school yet. You truly have impacted my life sir
Without going into detail, your closing statement was 200% spot on! Another great video, thank you!
If you dont have an infrared thermometer or infrared camera and you suspect a poor connection, I like to simply voltage drop test the suspect connection. For example on this testing the line coming in, to the top of that fuse would have had some some voltage drop as long as current was flowing. If you know the amps going through and the volt being dropped you can essentially calculate the watts of heat being generated in the connection by multiplying the two values together. Not trying to sound like a know it all, it just has been a good trick for me.
Also I'm not sure though if your field piece meter will do millivolts the finer the measurement so to speak the more meaningful the value. It seems that most HVAC clamp meters only read to the tenth of a volt. Anyway hope that helps someone. Cheers
Great tip! I'd suggest you make a video about it. I'd watch it.
It’s true as I use it on automobile repair,and it does work!!
Before this video I got an ad about starting a HVAC business in California. They know Mike.
this guy is so safe. i admire it. wish my last job was like this
Hi, great video. everytime I watch your videos I always learn something new. but sometimes you miss the most technical valuable information. thank you.
Troubleshooting 101 techs take notes...Id love to train under this man excellent work.
7/26/19 I was working on a server unit and they had the building power transformer blow up and after it was replaced the server unit didnt come back on, I checked the fuses in the bus bar and 3 of them were bad.
I assumed that the transformer blowing up blew the fuses with the power surge. I'm positive it did but I replaced the fuses and the unit started up, ran for 1¹/² to 2 minutes and then, BOOM blew the compressor motor terminals right out of the peckerhead because it was a remote condenser the compressor was in the building and leaked refrigerant right into the building. If I would've taken the extra time to ohm out the compressor I probably could've avoided catastrophic failure of the compressor. I was just in a rush, they were needing cooling for the server racks and they had a recent history of blowing fuses and I think it was an onset symptom and byproduct of dirty/surging power from the transformer that was in its stages of failure and totally failed earlier that day. Some times that extra step is critical it may be the end of the day on friday and they need cooling but try to go in with an open mind even if you know the history of equipment and take your time to save yourself and your customer the hassle
At least you've learned to check each time now. 😏
I've made a few large bangs myself. For example I'm British and as a younglings I installed some Air Conditioning but the incoming power wiring diagram was in German and included the position of the control wires. I switched on for the 1st time and the PCB exploded because id accidentally wired 240V direct to the wrong board terminal.
I have never seen a bad disconnect knife. Very cool,
I know the young'ens coming up appreciate your knowledge sharing ... Good vid Chris ...
Their is a recall on those disconnects. From November 19 2015 to January 23 2018. The switch may not close or open properly. Look for a yellow dot on the handle. These have been upgraded. Eaton/ Siemens DH321FRK. Good find on the disconnect issue. I would (didn’t see) checking total amps at disconnect to unit amps. I’ve seen heat contactors and sequencers stick and over amp the fuses. Good job on changing all 3 fuses. The others were stressed when that one blew. You could leave the other 2 there for emergency use.
Excellent job of troubleshooting with the unit while running or attempting to run. You are correct an IR camera and practice using it for troubleshooting can make it a valuable tool. May be able to troubleshoot circuits using the IR camera. It always easier to use an image to show the customer what’s wrong. What we have found is that the sheaves are what wear out rather than the belt breaking in. It used to be that the belt would break in, now it’s more like the sheaves wear out to accommodate the belt. I use the high speed camera on my cell to better diagnose belt issues. Put a measuring tool behind the belt and it’s easy to measure belt deflection in the high speed footage. Yet another trick I use is to use a dB app on my cell or a proper dB meter to quickly locate the machine with the most mechanical problems. Works in theory 100% in the field about 80% but it is fast and pretty reliable. Also for mechanical problems I have used a vibration app made by some Russian dude, the app is tight other apps are not so much. The humble cell phone is a pretty good troubleshooting tool.
Very good troubleshooting skills, May I add the reason many disconnect switches have this same problem is because we don't lubricate the mechanism inside the switch lever. There is a spring mechanism that snaps those blades back in place to stop blades getting hot from poor connections. You can spray WD40 on this mechanism until it snaps those blades into the proper position. If you don't hear the disconnect snap into place it will need to be lubricated.
Great catch, impressive troubleshooting technique.
An asset to the HVAC community for sure, thanks for the great vids, keep them coming
This looks like it's somewhere in Ontario, maybe up near Rancho. We watch your vids all the time in my HVAC class. Respect!
75% of techs finish troubleshooting after switching that fuse.
Juan Todolí did you just make that number up? Because it looks like you just made that number up
85%
@@TheJordanwright 95% of statistics are made up.
To the Public, the 3 Phase Compressors and Evaporator Motor have a Hot Leg all the time, the Contactors are all Two Pole, the third pole goes directly from the Disconnect to the Motors. I always hated that, and think it should be prohibited.
In the EU it is forbidden now
@@Worstenboer Glad to hear that, hopefully they will make it illegal in the US. I got lit up from a unit, Evap. Fan went to ground, units ground wire had vibrated loose.
The x to c it's something i did not know I like how you went through the whole system thank you
Really good video.... people should gain a lot watching the demonstration of skills on your videos.
Thanks Ted!
Appreciate the professionalism....
Good thorough job, great tip with the disconnect and the temp gun👍🏽
Your electrical troubleshooting is stellar!! Much respect
thanks
Nice job out there. Your like me in finding the root cause of the problem in order to prevent a call back. It costs the company much more to return back to a call, rather than just to spend 15 extra minutes or so to look at the system overall. Call backs are always embarrassing as well.
Thanks for watching I will be going live on CZcams this evening 7/1/19 @ 5:PM west coast time to discuss my most recent uploads and answer questions from emails and the chat. Come check it out if you can czcams.com/video/rlHkdZSIjdU/video.html
Man those condensers could use some lovin'!
"This one has the hidden condenser". At least it's not the one with the "invisible" condenser. Those are damn hard to replace.
Nice learned something from this video. Never knew the thermostat was there. Still learning here.
Learn something new today. I had some issue as you and I’ll definitely be checking the disconnect when I have an issue like this. Thanks
I learn something new on every video you Do! Outstanding work!
No tangent brother.
Kick that knowledge!!
Loved it. Thank you
Hello Matthew from Ottawa Ontario I appreciate what you do and for the unit this looks like a new unit
I’d like to see a bit more on what you’re seeing with pressures, like what you’re expecting from that unit vs actual shown and its variance from ideal, etc.
Some great information for an apprentice like myself. Thank you. Wish I could run calls with you.
Interesting cause. I love watching over the shoulder of a professional at work, I always learn cool things.
Keep up the great work man :)
Thanks bud
I cringed a little when you reached in to push the new fuse in the holder while holding the earthed metal framework with your other hand. Keep clear of earthed metal and good boots, also electrical glove would of been a very good idea with a leather outer. If that disconnect failed or a dag of wire connected that line to a fuse holder... I am alive today because I always use the one hand in the pocket rule around live circuits.
Sweat ; gloves wet from sweat ; moisture from sweat.
I remember my first summer (2004) as an HVAC Service Tech. I found those Carrier package units with the doubled up condenser coils plugged up with cotton from Cottonwood trees. It was a royal pain in the ass to clean. This was at the Lake Elsinore Outlets. Yesterday, in Sedona, Arizona I found a Ruud gas pack with a microchannel condenser coil plugged up by Cottonwood trees. That was much easier to clean. All I did was took a soft bristle brush brushed the loose stuff away, and then washed the condenser coil from the inside out. I'm not a fan of the doubled up condenser coil design.
Funny I just drove by the Elsinore outlets and noticed the coils were all plugged up with that crap...
@@HVACRVIDEOSDo they still have those same Carrier units up there?
no they are changing them out to trane units, Thanks for watching I will be going live on CZcams this evening 7/1/19 @ 5:PM west coast time to discuss my most recent uploads and answer questions from emails and the chat. Come check it out if you can czcams.com/video/rlHkdZSIjdU/video.html
Im surprised that the facility engineer didnt know which one was the bad unit. Im not surprised
me neither. facilities guys are hit or miss. some got it together, some not so much / dont care.
Nice catch on disconnect!!
Awesome tip with the temp. gun. i am going to use that one.
Awesome awesome tips. I've learned so much in the past month since I found ur channel. God bless u please don't stop making videos.
I would have liked to see the disconnect replacement still a great video thanks for sharing.
I have learn to just do a a quick pm making sure connections are tight . I recently went to service call at my church where they had new unit installed. I found 2 blown fuses never heard of it . Did my test on all motors checking for grounded motor all checked ok went to the disconnect and started tightening screws on wire the first was loose I got 4 turns out of it. That was my problem. I will now by a laser thermometer and make that part of my pm . Heat video thank you always learn alot
I will be going live on CZcams this evening 11/25/19 @ 5:PM (pacific time) to discuss my most recent uploads, and answer questions from email’s , CZcams comments, and the Live chat come on over and check it out if you can. czcams.com/users/HVACRVIDEOSlive
I would look for a short on all those wires going down from control board through the metal case with no grommets and literally blowing in the wind at like 18:47.
Thanks for your videos methodical approach is always nice to watch!
You should really get a non-contact voltage tester! It's a lot faster than using your volt meter to check if something is dead (and more accurate because it doesn't depend on making good contact with terminals and ground). It literally takes one second to scan a disconnect to see if it's dead. Depending on the spacing, you might be able to scan over the three phase legs and determine if one is dead without using your meter. I recommend the Klein Tools NCVT-2 model. It has a dual range that allows you detect if you have 24VAC on wires as well, so you can see if your transformer is working and what the thermostat is calling for if the wires are spaced apart on a terminal block. Love mine, use it whenever I work on any electrical.
i Love mine too ! But, it will NEVER Replace a meter. But has some awesome uses as u say. its kind of like a Detector detecting if electricity is in a wire only by holding it above the wire. they are definately cool.
"Speed kills".
I have the same tool, it has its place and use, but I am not trusting my life with it.
Looks like the CLO's have been bypassed.
Excellent work, very thorough.
Great vid as usual , Chris 👍. Funny how I do have a laser thermometer but I've never thought of using it to check connections temps ! You've just made my day with that valuable tip , sir , thank you !
awesome, I'm glad i could help! thanks for watching
Thanks for the vids. Found your troubleshooting skills great and ur are great teacher.
Haven’t even watched the video and I know it’s amazing great job Chris!!!!
Absolutely fantastic job
Nice work, might be worth mentioning that the temperature and/or voltage drop comparison relies on each phase is loaded about the same.
Since it had 3 phase supply I *guess* it probably have a 3 phase motors / compressors.
That's good work a lot of people would just throw in another fuse and then turn the power on hope for the best possibly causing more damage good thinking !
Thanks bud
The only thing I worry about is you do not use lockout / tag out procedures. I know its time consuming. Other than that, you are really an excellent technician. I enjoy your video's.
Those disconnect knives need to be lubed along with the mechanical linkage
Nice repair video 👍
Great troubleshooting!
Great video. Very thorough. Keep on posting
Thanks Luke!
Keep the videos coming. Your videos are interesting and informative. 👍🏽👍🏽👍🏽
Hands Down Brother!!! 💪🏼💪🏼💪🏼
You're a bad bad man👍🏿
Good vid. good catch on the fingers not making good contact / not going in all the way. see it before. pretty common problem.
alot of times forgotten to check or overlooked. Good reminder here !
Wires Look suspect going into electrical hole in bottom of electrical control panel. wires rubbing bare against sheet metal bare hole. also wires entering motor look suspect. good places to check when slow.
i Just did contactors on a unit just like that. those ones look toast too. time to go on those contactors when burning like that. they are cheap. Super important on a 3 phase unit like that to have Good contactors. could be your fuse blowing problem too. i just had a weird contactor problem. weak spring on a contact point set. points flopping around when u tap on the unit.
Great video.
Skills homie , good job
Very thorough bro! 👍🏽
Another fantastic video. One question/comment. You obviously went somewhere (to a breaker panel) and shut off power to the rooftop disconnect, however.... you didn't mention anything about a lockout/tagout. Did you do a lock-out (fixed auto-correct mistake)? I hope so. No telling when someone might happen by and light up a breaker. Be safe and keep these great videos coming.
Sometimes you can just bend the switch poles slightly to get better contact, at least temporary until you get new disco. Good procedures you ran though, peace.
15:29 you overlooked a clear hint for a heat issue: Take a look at the wires. The heat melted the outer part of the isolation on wire 1 and 2.
Carrier.. splitting coils to clean them..just soooooo much fun
Said no one ever............:-)
Right..and customers are like ..what do you mean it costs more????
FLY EAGLES FLY Bleed Green Tranes are fun to split also.
good job bud. I know someones who is really good at changing fuses(mike) haha...have to say you are just as good.
Weather master carrier units. I have a lot of these at the buildings I work on
13:19 Thank you for this tip!
Thanks for watching!
What was the reason for the fuse to go out ?
A) old discount
B) was amp drawn
C) something else
The disconnect switch was not making good contact and causing an overamp situation.
What made it do that ?
After replacing fuses, you said no resistance, but wouldn't that mean 0 ohms direct short, not no continuity?
Benjamin Crall I think he meant to say there’s infinite resistance to ground and each leg
it must be so cool to work with such a beautifull vieuw!
WHEN IN DOUBT, JUMP IT OUT !!!!!!!!!!!!!!!!!!!! :)
just make sure u check for shorts to ground first. then have at it.
you did a good job!
Thanks
Anyone else's asshole still pucker when changing those fuses? even though no voltage has been verified LOL
Nope..wear the right gloves and fuse puller and all is okay. If the old fuse didn't blow apart but was dead in theory when the culprit is disconnected all should be okay when putting in new fuses
I check once for 120, twice for 208, and three or four times for 480 before touching anything. I knew an electrician that had been at it for over 40 years. I watched him pull a 200 amp fuse with his bare hands while saying here is your problem. 5 of us were there, all five of us ran! I am not that brave. He actually died of old age believe it or not.
No. But that comment was Funny as Hell ! 🤣🤣🤣🤣🤣 i'm still laughing. 🤣
480 volt makes me pucker. metering out at 512 volts it will make u pucker a bit. but not 208.
Love your videos brother!
One thing though, could Line 1 also be hotter because it's taking more load?
I usually come across units where L1 is jam packed leaving 2 & 3 running at lower capacity..
learned a lot thank you
Just started video.. blown fuse..what motor is bad.. compressor or fan motor..usually on 3 phase the compressor or wiring causes bad blown fuses.
Holy shit, I just learned something new thank you
If its a bearing, I bet they could be replaced. The windings and everything else is fine.
I have no idea how that happened!
Great video thanks alot
Those MQ screenshots are impossible to read on my phone. Just FYI. I assume most of us are watching on our phones.
What you are talking between you and your customers is called "a balancing act".
Good vid
Please do trane voyager
I find this very helpfull.
I see that new Milwaukee drill I bought the same one and made the switch Welcome to the dark side.
I'm on the fence , mate , should I get the drill or the impact ? Advice ? Cheers .
Sterling Archer get the kit with both it’s a better deal
I am not a fan of impact guns for panel screws. If your using it to screw legs into wood than yeah but if it is for drill bits and screws go with the drill.
@@HVACRVIDEOS I'm gonna try and get the drill then , cheers
@@logan2195 I was gonna get the drill but I'm kinda hoping the price will go down a little. Over here in Europe , Milwaukee is more expensive than German brands like Bosch and such
Did you check the compressor to see if they were shorted or had bad windings? You didn’t mention that in the video. But all in all great video
In Germany, a similar type of fuses is only used to protect 3 phase resettable fuses like to each apartment on the distribution box with the meters etc.
They are commonly referred to as "Panzersicherung" (Battle tank-Fuse) in English they are called HRC fuse.
I've never seen round fuses here anywhere - are they still legal in the US for new installations? :)
👍 what kinds of wiring practices do you use for the 6-8 awg wires like in this unit when you have to make repairs? Do you use special crimp tools and connectors like how they come from the factory?
I keep watching the new videos and this one has managed to have the most short comings from your recent videos
FYI you need to check fuses before removing covers and claims
Bypassing a disconnect switch and “getting the customer running “ can make you loose your license you should know that when ur not hands on with something ur being negligent that’s not how you repair multiple units??? Throwback
I think you need to watch again, I never bypassed anything
You jumped the disconnect switch with the cover open !!!! And then showed everyone on the young toube how to get a shock lol Popped fuses with ur hands put a disclaimer that the equipment is live or learn how to diagnose without electricity
I turned the disconnect switch on while the cover was open but there's nothing wrong with that I needed to verify voltage at the disconnect switch I did not jump anything out.
Condensers are the most fragile part of the air conditioner
Nice!!!!( do you ever use fin combs?)
Don't get me wrong , i'm not trying to pin on you but I didn't see you checking how tight wire connections at the disconnect switch or contactors at that matter are . Those contactors that are almost black must be replaced before further troubleshooting. I know the business with restaurants is tough (been there for over 20 years) and you are trying to make a bill more affordable but they will blame you later for not disclosing all issues.
I keep hearing you say something about it being milfed lol
Wow man I'd love to work with you
how did you turn off incoming power to fuse box?I thought that was always hot on one side?