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Reading the “homework” from 3.5 half splitting – under the condenser split portion – this discussed a shared condenser between dual compressors. This is something I have not been exposed to or forgot about, so I will have to do more research. Interesting.
Hello.
For question 2 – ohhhhh. I understand now. I was looking the other way – towards the load. That makes way more sense. Very helpful.
For question 1 – sorry! The schematic was the same the whole time but if you look at video 4, at 0:33 – this is the problem report from the customer. And then if you look at 3:46 it will show you the snapshot of the schematic. I guess I am asking – is there really only 1 condenser? That seems like it wouldn’t make sense but also I believe this is the first example I’ve seen with 2 compressors, so maybe I’m misunderstanding. And then – the schematic only shows 1 condenser fan I think – if there are 2 condensers, do they just share a fan? The fact that there is only 1 made me wonder if I was wrong and they somehow share a condenser too.
Again, much appreciated. Thank you.
This was very helpful and everything was answered. Thank you.
Thank you.
Regarding the wires you can check amps on, that makes sense. I guess I was a little thrown with the circuit being L1 to the inverter, lots of stuff happening at the inverter, and then neutral back from the board – I didn’t know if that would have some impact. But I understand.
This makes sense, I appreciate it. I’ve really been spun around on this power source for the BLDC compressor (AC vs DC), but I think I’m hearing I can stop worrying (obsessing) about it. I understand the troubleshooting and the process described in the module. I was worried this gap in thorough understanding would bite me at some point, if I didn’t know it inside and out, but it sounds like knowing precisely what is happening, where the switches are, etc. is not necessary. You’ve helped me understand the concept, much appreciated.
Because it also says it runs on the varied AC voltage.
And thank you!
Thank you. I now understand. I didn’t have any issue with BLDC motors in the core etc. but the addition of the AC load and line input confused me. Much appreciated, moving on.
Thank you. I didn’t know if the three way would move to open the fresh food compartment path, which would close the freezer path, and this would somehow stop the compressor from being able to pull refrigerant from the freezer evaporator (like pulling on a vacuum), or if this would ever be relevant.
Your answers have been very thorough and helpful. They are greatly appreciated. I apologize for the numerous questions.
Thank you for your response, it was very helpful.
I still find the BLDC situation a little confusing. But I’ll review and get to the bottom of it. I understand after your response that the fan has no need for the line voltage because it doesn’t need the same amount of power, so it is all powered via DC. I remember the diagram that shows how the switches are changing paths that effectively create an AC power.
I guess with a compressor, the line voltage is supplied separately to the inverter. It is using the line voltage (AC) to put out the appropriate DC power, which the switches are commutating into effectively AC power, right? So it goes AC input from line, changed to DC output that board is actually creating but that output is effectively changed back to a 3 phase AC voltage via the switches? For example, this BLDC compressor motor shown in the second video of 1.13 at about 15:12. The return circuit for the BLDC motor connects to the inverter. This portion is an AC circuit? That would require my meter to be in AC and requires the neutral that is connected to the inverter to be a complete circuit?
I found my other answer – at 5:22 of the video in 1.12, it states that the inverter board itself does run on the 120 VAC. So the line voltage is supplying the power to the inverter, it is not being powered by DC voltage from the main board. Boards run on DC, right? So this separate 120 VAC is being changed by the inverter to DC to run its own operations?
This was very helpful, thank you.
4. I assume the reed valve is not fixable – requires new compressor?
This was very helpful, I appreciate you taking the time to answer so thoroughly.
Thank you,
Dan
Sure! sorry for the length.
1. This is from the text after video 3 (A failed defrost system in a refrigerator). This section begins with, “Sometimes, you can’t tell visually…”
2. This is from video 4 (GE TMNF Adaptive defrost systems). The portion about 4:20 is what confused me. I understand the other process, with the door switch.
3. This is just a general question. When I watch some of these repair videos, the freezer is obviously empty. I remember we are to instruct them to leave it shut an plugged in until we arrive. I was just asking best practice – do they also need to leave the food etc. in the freezer and you take it out when you get there?
4. This is from Video 5 (fixing an iced up bottom mount freezer in a Maytag-whirlpool refrigerator). He is cleaning the drain water with hose/mouth at about 6:25 and references using salt water, but I didn’t see this happen and do not understand what he means.
Generally, when this drain gets clogged and there is no obvious reason, what do you tell the customer and how can you assure them it won’t happen again (and is actually fixed)?
I’d also add – at 5:38 he says he’ll use a plastic knife if in danger of puncturing “these tubes,” are these evaporator coils or are there other tubes I should be concerned about?
Thank you!!
No, no. That makes sense. I mean I’m not sure I would have remembered that if without having found the information in another answer post.
Luckily, this schematic says it. This one sort of confused me, I’m not sure why. If it was the element being above and the lights below but protector being attached to the element etc. Or if it was the vocab. with hot light switches, temperature limiter, protector, etc. But I read the the underlined portion and it just did not click what it was saying. It makes more sense now, I appreciate it.
I was thinking of the RTD unit (module 3, unit 4), when it talks about RTD use in surface elements. That picture of the RTD surface element (no box) and the thermal limiter element (box) stuck with me, where you called out the lack of box for thermal limiter on the RTD.
I was just a little turned around in this one. I understand now. Thank you.
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