Instead of using a digital multi-meter to look for a switching DC voltage on the communication wires of a mini-split I purchased a cheap Amazon pocket oscilloscope to hook up and visually see what is going on.
One note of caution is to not allow the scope lead to be grounded as both connections to the probe have high voltage potential to ground.
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Noticed your scope setting is on DC is selected by the scope in auto or you know to put it on dc. I ask because the power s2 s3 is ac I thought?
Hey bud what kind of clamp meter do you recommend for reading hertz on these minisplit compressor
Nivce video very interesting. Would you be able to simulate outside noise that effects the communication from the outdoor to the indoor unit, on your home brew system to see what effects and diagnosis symptoms would be. Thanks so much.
Any idea what the communication protocol being used is?
That’s great! I need that scope to troubleshoot DDC networks. What’s the price? @hackfreehvac
Song The oscilloscope what would be the difference between the sine waves I know that I see one is square and truncated one is Flowing I think one with his digital I can't remember
Why do they say not to splice communication wire?
Love your videos man! You are one of the best techs on YouTube no doubt bro.
Ty great video
wow, this building have a whole lot of daikin unites
Hack free is the way to be
replacing boards every 5 years and whole unit 10 years is ridiculous…. BuT iTs BeTtEr FoR tHe EnViOrNmEnT dUh…
Are you just plugged on S2 and S3 with the scope?
Some of these companies get it, other's don't. Saw it all the time in the machine tool industry. The better machines had connectors on both ends of their sensor/actuator wiring runs. It made replacing components easy. Other machines were ridiculous – a simple $30 proximity sensor would have a 20 foot long wire snaked through the entire machine, through countless bundles and cable chains and ducts, be just just about impossible to change. It was simpler to just cut the old sensor off and wire in a plug so it could use the same easily replaceable proximity sensors as everything else.
Thanks for sharing Hackfree HVAC. So glad now that now at 55 years old, I'm working "in-house" until retirement. Back when I was in the field in the 1980's and 1990's, there were no laptops or circuit boards in any of the A/C units, (or recovery units back then for that matter!).
Daikin love zip ties! My number 1 bug when replacing parts on their systems.
Link for that scope? I’m lazy 😉
I’m currently visiting Phoenix , and every time I see a Goodman turd on a roof top I think of you ranting lol y’all got some bad ass scenery out here!
There must be a way to test the signal from the main board inverter to the compressor using a scope. Have you tried that?. Instead of using the inverter checker tool with the six lights that go around in a circle or disassembling all the wires off the board in individually testing for home readings by hand. I wonder if there’s a faster way to do it just using a handheld scope ?
You’ve covered the basics of networks and multiplexing. As a car tech, used it all the time; never thought I’d see it so soon in Hvac!
What model is your KUMAN?