Susan Brown

[Susan Brown]

It is a lot! For most of our students this is their first time learning this type of refrigeration material. It definitely takes time and practice to really get a strong grasp of it. We try to keep the quizzes pretty straightforward so you can get through them, but hope that students will revisit the material later so they can continue to get more familiar with it.

[Susan Brown]

I have an appointment this evening, so no time right now for more detailed help. Here are the answers – see if they make sense, and if not, let me know.

You can use the transcript search on the videos to find where we talk about things.

What are some “non-invasive” and zero disassembly methods for half-splitting a warm refrigerator problem between the sealed system and everything else? (Choose all that apply)

I answered this above

Did you mean the iceball question?
Answers: Early-stage leak
Undercharge

With a low side leak, how would you expect the high side pressure to compare to normal?

Higher

Question #6 – With a complete capillary tube restriction, how would you expect the compressor run current to compare to normal?

Lower

[Susan Brown]

Hi John,

Lots of techs in the Appliantology community work on LG refrigerators – the key is to be able to reliably troubleshoot down to the correct component so that when you replace a part, it fixes the problem. This makes it a good value for the customer, and makes sure you are not losing money on jobs.

That is the main point of taking the MST training – to be able to troubleshoot well!

[Susan Brown]

A few high-end fridges have ports for measuring pressure, but for most refrigerators it is invasive – you have to pierce the lines.

Besides amps you can measure temperatures at strategic locations to get information about the sealed system functionality.

Danfoss App: They made a small change to their app that makes the numbers slightly different than what we show. No biggie!

[Susan Brown]

Hi Jonathan,
I sent you answers via email.

More on the thermistor:
If you have only one load in a circuit, it will always drop the source voltage (120v for a fridge), no matter what.

When you have two or more loads in series, the voltage drops will add up to 120v, and will be proportional to the resistances.

Example: If one load is 10 ohms and the other is 20 ohms, you’ll have 40v drop across the first and 80v across the second. But if the 10 ohms load changed to a 20 ohm load, then you would have 60v across each one. (I’m not saying what the typical resistances are with thermistor circuits, but just showing how it works.)

[Susan Brown]

Good! Yes, it seemed to be a brief outage. Vimeo is normally very stable.

[Susan Brown]

Vimeo (our video host) was having issues as of 11:06 am EDT. They usually resolve things like this quickly.
I was able to get some videos to load just now. Tip: It’s always good to clear your cache before trying to reload when there’s been a glitch like this.
Sorry for the disruption!
Susan

[Susan Brown]

Don’t worry about that now. You’ll learn a lot more about that in Module 3!

[Susan Brown]

Correct!

[Susan Brown]

Hi Denis,

Question 4
The answer choices are:
gold
aluminum
glass

Which of those do you think would make the least good (in other words, worst) conductor?

Question 14
The answer choices are:
1. It is the voltage difference related to a load that is actively doing work
2. It is the difference between the voltage used by a load and the source voltage
3. It is the difference between what the voltage supply is supposed to be and what is actually measured

Which is the definition of voltage drop?

[Susan Brown]

Glad to hear it!

[Susan Brown]

Were you able to get the videos to play?

[Susan Brown]

Hi Walt – did you received the email I sent you with feedback?

[Susan Brown]

Hi Robert,

I just checked and the videos played for me, so this must be on your end. The thing that usually clears up an issue like this is to log out and refresh your system – clear your cache, start with a fresh browser window.

If that doesn’t fix it, let me know!
~ Susan

[Susan Brown]

Dee – did that fix the issue with the videos playing for you?

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