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October 3, 2020 at 11:47 pm in reply to: Split Phase Drive Motors and Timers in Top Load Washers #20252
So anytime I see relays and triacs, I am looking at the control board
I would put a slightly finer point on that. If you see a relay or a triac, you’re looking at a control board, not necessarily the main control. Some units have multiple control boards, and some even have dedicated relay boards.
October 1, 2020 at 12:53 pm in reply to: Split Phase Drive Motors and Timers in Top Load Washers #20241Are switches always in the control board?
Switches in general don’t have to always be on a control board, but specifically relays and triacs will always be on a board of some kind. That’s because their purpose is to use a small DC control voltage to switch a large AC voltage.
September 30, 2020 at 5:09 pm in reply to: Split Phase Drive Motors and Timers in Top Load Washers #20239This is just a matter of learning different schematic conventions, some of which definitely can be confusing when you’re unfamiliar. In this particular case, all of the segments of wire and switches that are thicker and darker are timer contacts. That’s just how the engineers chose to draw the schematic.
Does that answer your question?
You’re thinking along the right lines — you might have just gotten your terms mixed up. Multi-point ignition is when you have one spark module igniting multiple burners. Single-point ignition is when a spark module only ignites a single burner, so each burner has its own spark module.
Reviewing the video on this topic is a good idea, too. Let me know if anything still isn’t clear!
if there is an issue with return current where does the burner head come into play?
We’re seeing the spark make it all the way out of the electrode, so an educated hypothesis is that something after that point in the circuit is interrupting the current flow. And the burner head is the first step on the current’s journey through the appliance chassis back to the DSI board; it’s the big hunk of metal that the spark wants to jump into.
If that burner head isn’t properly seated, or maybe if it’s covered in gunk that insulates it from the rest of the chassis, that could certainly mess with your return current.
Make sense?
September 25, 2020 at 11:38 pm in reply to: Refrigeration….Just when you thought it was safe to be here; I’m Baaaaaack..! #20227Sorry for the slip up calling you Scott last night.
No worries! Happens more often than you would think. 😉
September 25, 2020 at 10:59 am in reply to: Refrigeration….Just when you thought it was safe to be here; I’m Baaaaaack..! #20220Gauge, as its name suggests, is what you would see if you used a gauge for measuring the pressure, so it’s the more practical one for us to use in a real-world situation like this. But Scott could have just as well used absolute instead of gauge. It doesn’t really matter which you use, as long as you make sure you don’t get them mixed up.
September 24, 2020 at 6:36 pm in reply to: Refrigeration….Just when you thought it was safe to be here; I’m Baaaaaack..! #20216Make sure to use inHg gauge, not absolute. If you do that, you’ll get around -1.5 inHg in the Danfoss app, which is almost exactly the same value that Scott got in the video, except negative.
Why didn’t Scott include a minus sign in the video? Because he’s talking about inHg Vacuum — “Vacuum” meaning the negative end of the inHg gauge scale.
September 22, 2020 at 5:57 pm in reply to: Schematic Exercises: Appliances with Electronic Control Boards 3 #20204It’s hard to talk about this without looking at the schematic together, so I’ll go ahead and show this schematic markup — see if it makes sense to you.
September 22, 2020 at 5:05 pm in reply to: Schematic Exercises: Appliances with Electronic Control Boards 3 #20201I think you might be looking at the heater PCB (control board), not the heater itself. The heater itself is connected to the heater PCB at 32-2. See if you can trace out what the other end of the heater is connected to and deduce which side is line and which is neutral.
September 22, 2020 at 4:57 pm in reply to: Schematic Exercises: Appliances with Electronic Control Boards 2 and 3 #20200WAIT, I think I am beginning to see it now. Sorry for the inconvenience, I was getting a little frustrated with myself. I just reviewed the schematic and found something I did not realize. Part of learning I suppose.
Great to hear! Sometimes a little persistence is all it takes to have that “aha!” moment.
But if you still have any specific questions about these units, let me know!
September 21, 2020 at 5:56 pm in reply to: Refrigeration….Just when you thought it was safe to be here; I’m Baaaaaack..! #20194Hi Darren,
Yes, differences like that between your results and Scott’s are just due to tweaks that have been made to the app since that video was recorded. Those are very small variances which would not make a difference in an actual troubleshooting scenario.
September 21, 2020 at 3:08 pm in reply to: Schematic Exercises: Appliances with Electronic Control Boards 2 #20192The relays are open as shown, you are only measuring N-N.
That’s exactly what EEPs are — two points in a circuit that have the same electrical potential. In this case, both of those points have 0 volts of potential, regardless of whether the relay is open or closed.
Does that make sense?
What that question is asking about is devices like triacs and relays, both of which allow the board to use low-voltage DC power to open or close a switch — thereby switching AC power on and off. That’s why you can say that they’re controlling AC loads using DC power.
Does that make sense?
September 20, 2020 at 3:57 pm in reply to: Refrigeration….Just when you thought it was safe to be here; I’m Baaaaaack..! #20186Another question has formed in my mind…watching the Practical Sealed System Thermodynamics video…the term Cap Tube separation is mentioned as a possible reason for the shift in the vertical line down to the Evaporator Coil…what does Cap Tube separation mean..? Thx
I believe what that’s referring to is how the capillary tube separates the two different pressure zones of the sealed system. There’s the high-pressure side located after the output of the compressor (that’s where the condenser is), and then there’s the low-pressure side before the input to the compressor (that’s where the evaporator is).
Make sense?
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