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Samurai Appliance Repair Man's Blog



What does the run capacitor do in split-phase compressor circuits?

compressor, refrigerator and 2 more...

The run capacitor is wired in series with the start winding. When the compressor first starts, the run capacitor is shunted by the closed PTC (or whatever start relay or device is being used) so current just flows through the main and start windings which are in parallel with each other. The start winding is there to create that split-phase magnetic field that's out of phase with the main winding field that rotates around the stator. This rotating magnetic field is what starts the rotor turning from a dead stop.

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After the compressor has started and is up and running, the PTC opens which removes the shunt from the run capacitor. Now the run capacitor and start winding are in series with each other and both are in parallel with the main winding.

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At this point, the run capacitor does a couple things:

1) limits current flow through the start winding

2) smooths out the back EMF pulses from the main winding.

The net effect of the run capacitor is to reduce the current draw of the compressor while running (which also helps it run a bit cooler) and to help the compressor run smoother and more efficiently.

If the run capacitor were shorted (ie., replaced by a wire), the compressor would still start but the compressor would draw A LOT more current, run very rough, and quickly kickout on thermal overload.

I have never seen a run capacitor fail short.


Learn more about refrigerators and how to troubleshoot them in the Refrigerators training course at the Samurai Tech Academy.




Source: Sub Zero 632-S S/N prior to 1810000


Learn Appliance Repair Online at the Samurai Tech Academy - Limited Time Tuition Discount!

Posted by Samurai Appliance Repair Man, in Appliance Repair Training 06 July 2015 · 308 views
appliance school and 2 more...


Learn appliance repair at the best online appliance repair school on the web! Act now to take advantage of this limited-time offer for a 14% tuition discount. Offer ends July 11, 2015. Use the coupon code FREEDOM14 on the Enroll page: http://mastersamurai...ine-enrollment/

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http://mastersamuraitech.com/


Dielectric Grease: Myths and Reality

dielectric grease
There's a lot of misinformation and mythology out there in the tech community about the use of dielectric grease on electrical connections. Some techs, knowing that the word "dielectric" refers to an electrically insulating material, mistakenly conclude that dielectric grease should never be used on electrical connections. This is based on a misunderstanding about how dielectric grease works.

Dielectric grease has two main properties that make it especially desirable specifically for use on electrical connections, especially in wet environments such as refrigerators and washing machines. In fact, this is its primary intended design use. Those properties are:

1. Low viscosity. This means that the grease will readily get out of the way of two metal contacts touching each other and flow around the contacts giving rise to the second desirable properly...

2. Sealant effect. As the dielectric grease flows around the contacts, it seals out moisture and oxygen preventing them from reaching the contacts and causing corrosion and/or oxidation.

Still don't believe me? How about Frigidaire tech bulletin RF1207:

Recommendation for Use of Dielectric Grease on French Door Models with Bullet-Style FFIM (RF1207)

Water intrusion into electrical connections within the FFIM causes intermittent interruption of ice production and melting of ice in the bin.

Symptoms: No ice in FF
Ice melting in the ice bin while FFIM is
turned on

Models Affected: All ICON, Electrolux and Frigidaire models with Bullet-Style FFIM

Solution: Use dielectric grease Part number: 5304485963

Part number: 5304485963

to improve electrical connections inside the FFIM. Application is recommended on EEV, TH3, TH1 and fan connectors, however it can also be used on any connector within the FFIM assembly. In general, if all diagnostics pass and the unit has 8.1/8.5 FFIM board yet the unit is either not producing or not maintaining ice, water intrusion into electrical connection can be suspected and dielectric grease may resolve the problem.

Bulletin is in the Downloads section here, starting on page 1-5.


Basic Electricity Demonstrated on the Hoary Cliffs of Moher

cliffs of moher and 3 more...
In this video, filmed on the hoary Cliffs of Moher in Ireland, I demonstrate basic electrical principles, like voltage and current path, using an electric cow fence charged with 5,000 volts. See, even when I'm on vacation, I'm thinking of ways I can explain this stuff to y'all!




Team Samurai Heading off to the Old Country

Posted by Samurai Appliance Repair Man, in Samurai Incarnate 26 May 2015 · 646 views
samurai incarnate, vacation and 1 more...
Well, mah Bruvahs, Mrs. Samurai finally convinced me that we needed to take a vacation. It's been decades since we've taken a true vacation that wasn't a business trip in disguise.

The past couple of years have been especially intense and transformative ones for Team Samurai (me, Mrs. Samurai, and our two sons Stephen and Sam) with the creation and development of the Samurai Tech Academy. I know I make all this look easy and it seems like one day I just whipped out MasterSamuraiTech.com like, "Oh, look what I just pulled outta my ass."

But designing the Academy and creating all the content for it was probably the toughest project I've ever undertaken. The comprehensive, preeminent training courses at the Samurai Tech Academy and the website itself represents tens of thousands of hours of intense focus by the whole team. The only other thing I've ever done that comes close in terms of sustained project focus was getting my Master's degree in Environmental Engineering and writing my Master's thesis-- and I was a lot younger, smarter, and better looking then.

These past few years have been so intense that it changed my whole lifestyle for the worse. That's okay-- you have to do that sometimes to get shit done. Short term sacrifice, long term gain and all that. Plus, I'm extremely proud of the Academy and all of the effort from Team Samurai. But sustaining that kind of lifestyle is also a great way to die early. I'm 55 years old. According to insurance company death statistics, the 50's are death alley for men. If a man is going to drop dead, he'll generally do it in his 50's. That's exactly where I was headed if I kept up the lifestyle of the past few years.

So, I'm going to use this trip to make a lifestyle change, too. For example, I haven't been hiking in the White Mountains in years and certainly not as a lifestyle anymore. That, my friends, will change. When I get back, there's gonna be less work, a more balanced life, and many, many sweaty, blissful hours spent bagging peaks with the Oz Man in New Hampshire's White Mountains.

So with the release of two new courses at the Samurai Tech Academy, the timing is perfect for Team Samurai to fly off to Ireland-- the "Old Country" as the referred to by the Irish diaspora-- for a ten day vacation. I'll do the obligatory beer drinking and pub diving thing but hopefully get in some hiking, too. Wifi is ubiquitous in Ireland so I'll still be checking in here at Appliantology and checking/replying to email.

Well, mah bruvahs, I leave you with a non-traditional Irish blessing from the inimitable and iconoclastic Ween:


Aye aye aye, sharpen your boot, and bludgeon your eye
Aye aye aye, the blarney stone brings a tear to me eye








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