This was a mystery, I was trying to find out why the fuse had blown and it’s not always an easy solution.

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01:26 VISUAL INSPECTION
02:40 CONTACTOR INSPECTION
04:51 LOW VOLTAGE
08:02 DISCONNECT INSPECTION
08:30 TIMECLOCK INSPECTION
09:40 RE-WIRE EXPLANATION
10:20 COMPRESSOR WINDING TEST
15:57 CONTACTOR TEAR DOWN
18:18 CLOSING WORDS

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50 thoughts on “WHY DID THE FUSE BLOW ON THE WALK IN COOLER ?

  1. Kyle Zilke says:

    I think you hit it on the head. It’s always an educated guess when it happens only when you aren’t there. I have had one fuse blow and it lasts for months with no issue.

  2. uxwbill says:

    I don't know if it'd be worth your while to do so, but I'd love to see you offer the "generic" HVAC/R logo from the hats on a T or sweat shirt. I'd certainly order some of those, if they existed, and maybe other folks who are a one man show would as well?

  3. A Wilson says:

    With the Breaker in between the Disconnect and the Equipment, the NEC might allow you to replace the Fused Disconnect with a Non-Fused Disconnect…

    It might be something to ask a Licensed Electrician…

  4. ProC says:

    So with a disconnect and a breaker, hard to tell in the video, but looks like the breaker was 20 amps and the fuses were 30amps. Since the fuse blew, wouldn’t that mean that the issue was between the disconnect and the breaker otherwise with a issue inside the condensing unit itself, the breaker would have tripped first. Just a theory.

  5. Silas Marner says:

    Chris, you present your trade and craft so eloquently, and you cover a wide range of subjects within HVAC. I wish you and your company and your family the absolute best in 2022.

  6. zordmaker says:

    In a unit of that age I certainly wouldn't be pulling stuff off willy nilly without knowing that was definitely the fault, otherwise you're likely to create more faults than you fix. For me? One 20+ year old fuse blows for no readily apparent reason? Most likely a fault in the fuse itself. Replace and just leave it. If same fuse blows again, suspect supply issue and replace again. Third time? Then pull the covers off and call sherlock holmes…..

  7. Jonathan Langlois says:

    Is the voltage issue related to equipment on the costumer side, or the utility side? That's one thing that I seem to notice about the US electrical grid. Since much of it is privatised, some issues are just overlooked. In Canada, we have certainly had some issues from time to time with our electrical grid, but it seems that every time there are issues, they don't just merely correct the issues. They make sure that it does not happen again, and they really don't mess around. They have a lot of power (pardon the pun) to be able to get the work done regardless of what property owners might think or say.

  8. J Hintonjr says:

    Just want to thank you man I’m new in the field. I have a lot to learn just finished school in September I start my job next month in hvacr a bit nervous considering I been a chef for 20 yrs lol. But hey man I’ve watched almost all your videos keep ‘em coming I will support the best way I can got to get me one of those hats!!

  9. Andy Peek says:

    Thanks again Chris for another informative program. Yes, old fuses get tired, and sometimes, just give up and blow, changing the contactor was a very good move, nobody knows how many times it has operated.
    I agree entirely about using MCBs on all systems, you dont end up single phasing the motor and cooking it, we have motor rated D curve breakers in NZ. You would have an equivalent in the USA.
    Im past retirement age now, but still working, I hope you do not mind me using your videos to train our apprentices.Its the best training series I have found.
    I wish we had had the internet back in the 70s, it was slide rules and log tables back then, and night school, twice a week.
    You and your employees are a credit to our industry, we need more 1st class engineers like you and your team.
    Take care all out there.And remember, The customer is always right, sometimes.

  10. PAUL B says:

    Contactor points are convex and new points make contact in the center. As they wear the convex shape flattens out. If they are flat it's time to replace the contactor. A rough surface indicates that the points have not been separating cleanly and are sticking.

  11. George Robles says:

    I think it was lower voltage/higher current, plus current of control circuit and comp' and fans and weakest fuse because those have tolerance too and it caused fuse failure. I totally think you where on the right path. Good one

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