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The meter leads that we use for getting into tight connectors can be found on Amazon. If you search for “Pamona meter leads”, you’ll see a bunch of different lead sets containing fine-tipped leads like those.
The spark module produces the spark, not the electrode. The electrode is just where the spark is supposed to come out of. Let’s say that you yank the spark wire out of the electrode, but leave the other end connected to the spark module, and then touch the spark wire to the chassis. You’d get quite a spark — no electrode required!
Remember the findings in one of the previous units:
To verify the problem, you trying lighting all of the surface burners. All light except for the LF. You do hear sparking when the LF burner is turned on, but it sounds much softer than the other burners. You also smell gas coming out.
This told you that the spark module is doing its job and sending out the spark voltage, but the spark isn’t reaching the electrode. And the component that’s between the spark module and the electrode is…?
If a refrigerator has a full-blown computer board, then all the defrost functions will be built in to that. They will definitely not have an ADC board.
ADC boards are only present in models that do not have a more sophisticated computer board.
We cover just about everything there is to do with sealed systems and getting certified for them in Module 3, unit 5 of the Refrigeration course. If you have a specific question about the material of that unit, let me know.
I’ve noticed that a lot of your forum questions recently have been about things that are directly answered in the course material. We’re always happy to help you out, but you need to put in the effort to absorb what’s taught by the course before asking. Otherwise we’ll just direct you back to the coursework!
Make sure to always reread the text and rewatch the videos in the relevant part of the course before posting here. Make lots of notes, too. Odds are that your questions will be answered in the coursework, and that will end up saving you time and improving your information retention.
Assuming that you’re referring to the last video in that unit, then no, it would not mean that something is necessarily wrong at your 240 VAC outlet. The schematic drawn out there is very simplified, because it is focused on just the heating element. The most common cause of a missing line to one side of an electric heating element is a failed control somewhere in that circuit, such as a thermal fuse.
So yes, the scenario shown in that video is a failure that happens pretty commonly in electric dryers, and the culprit is usually a failed control component in the heating circuit.
Remember what the purpose of a start device is: it’s to take the start winding out of the circuit once the motor has started. If it doesn’t do that, then the motor will draw excessive current, so much so that the overload protector will go open, shutting off the motor.
TSDs almost always fail shorted, meaning that they are no longer able to take the start winding out of the circuit. So yes, as the video said, the compressor will run for 10-15 seconds, and then get shut off by the overload protector.
How do you check the amp draw? Just like you would for any other circuit. Put your amp clamp around one of the wires and see what it tells you!
Check out the last video in module 1, unit 10 of the Refrigeration course — it goes into detail about the differences between TSDs and PTCs and how to troubleshoot them both.
What kind of start device are we talking about here? Is it a TSD on a refrigerator compressor?
October 24, 2019 at 12:58 pm in reply to: Question #8: What is the normal state of each interlock switch in a microwave? #17494The Samurai says exactly what state those switches should normally be in the first video for that unit. Give it another watch to see if you can find it!
Hi Shawn,
Could you post a link to the spec sheet or Amazon page for that Sperry tester? If we can take a look at the specifications for the tester, we might be able to figure out what’s going on here.
There will be a bit more info on that — there’s a unit later on that covers using the Ten Step Tango to troubleshoot a refrigerator. However, reading schematics is not a huge focus of Refrigerators, since Fundamentals and Advanced Troubleshooting cover that much more. The Oven and Range course also delves pretty deeply into a reading schematics and using them for troubleshooting.
It’s important to remember that reading schematics is not something you need to learn on a per-appliance basis. Schematics for all kinds of appliances work the same, so once you know how to read one, you know how to read them all.
A refrigerant vapor with high boiling point won’t do no good inside a evaporator coil.
Sounds like you’ve got the right idea, with one clarification: remember that vapor does not boil — it’s only liquid that boils. Since you want refrigerant to boil (i.e. change state) in the evaporator, having refrigerant that is already vapor doesn’t do you any good. And if the boiling point is higher than normal, even the refrigerant that is liquid won’t change state as readily.
We dive into the thermodynamics of refrigeration in far, far more detail a littler later in the course, so stay tuned for that!
The condenser fan is there to cool down the refrigerant inside the condenser coil to condensate the refrigerant vapor.
Correct! So if the condenser fan isn’t running, the condenser won’t dissipate enough heat from the refrigerant, meaning that some of the refrigerant will still be vapor when it exits the condenser. In addition, more heat means more pressure, and more pressure means a higher boiling point.
So if you have a) a portion of the refrigerant that is already vapor when it enters the evaporator, and b) a higher boiling point in the evaporator, what effect will that have?
Woudn’t a weak compressor not pumping enough refrigerant be the cause of a partially frosted evap coil? I don’t get why a condenser fan would be the problem here.
Let’s take a step back to understand the concepts involved here. Could you tell me what the purpose of the condenser fan is?
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