Refrigerator not working again

Sep 21, 2010 254 Replies

VFD has been around for years in industrial apps, but it is just now showing up in residential HVAC apps.

Its not the refrigeration technologies, other than much higher efficiencies, but rather the change in refrigerants with the changes in pressures and oils in residential HVAC stuff. This change is not new, its been in the works since 1989. Granted, there is a large portion of the "techs" out there who only have a ticket book, jug of gas and set of gages don't know or understand how a refrigeration system works or why it works that way. My company gets called frequently to straighten out their messes because the home owner tried to get it done cheap, instead of calling a licensed, insured, professionally trained, master HVAC tech.

A Phase Locked Loop is new how, to residential H/C ?

No, I was in that field in the late '90s and early '00s, until my health failed. Did you use any equipment from Microdyne? They were still supplying parts & upgrades for the 1100 series they built during that era. The 1200 series was still in production, along with the

700/1620 series, and the 1400 series. I worked on the launch of their RCB2000/DR2000 series to move it from prototype to production ready.

After I left the US Army, I started an Industrial Electronics repair business. I never had a sign on the business, or even a listed telephone number. I also did all the electronic repair for three school systems. The only time they asked for a price up front was when they needed new equipment. The rest of the time, the principals called me, and at the end of the month I billed the school systems. When I started, some customers had piles of 'unreparible' equipment that took six months to two years to get back from their previous contractor. I fixed all of it.

Someone really needs to clean up that industry, and I wish you luck. A lot of companies around here were hiring anyone with a valid driver's license. They don't care about their reputation, or their customers. Some operate under five or more business names, so when they screw a customer, they end up calling the same people.

I miss firing the M-72, and the sound of exploding parts inside big TV transmitters while you were on the air. The first was at a US Army base where I was a broadcast engineer. :)

Yes, on cars equiped with blinker fluid.

The Daring Dufas wrote:

Ever had the hood pop up and pull one hinge out of the body? It happened to me on I-75 near cincinnati, Ohio in the '70s. It was a 66 Opal Cadet. I was doing 55 MPH when the hood latch failed. A split second later I was looking at the bottom of the hood, that was caught on the wiper post. It had hit one of the carburetors and bent the top, which wouldn't let me slow down, and had ripped the reservoir off the master cylinder, so I had no brakes. I had to power shift to get work my way down to first gear before I shut off the engine. I was steering by looking down at the flashing white line, which made me quite dizzy. I finally got it slowed enough to pull off to the right side of the road. Luckily, I didn't hit anything before I stopped. I got out and ripped the other hinge out, and shoved it into the trunk. I pried the top of the carburetor open, so I could drive it home. The car was a total loss, because the of the hood hitting the right door post before it hit the windshield. The welds cracked, all the way down the door post, and across the floor to my feet. The only thing holding the body together was the roof and the left door post. I called my boss as soon as II got home and was told that I should have tied the hood down and drove to work, and that what happened was no excuse for missing work. Its no wonder that people called the place 'Chickenshit Electronics'. I was working in QA on the PRC77 manpack radio at the time.

Beware of relatives bearing grease! ;-)

Hello Steve, It is fortunate for the HVAC industry that the general public does not read the alt.hvac newsgroup. The regulars there seem to know more about their reproductive organs and lower digestive tract than anything about HVAC. I remember a reply from a homeowner asking a question and the slew of BS that came back was amazing. One memorable reply came from a regular poster (pjm) that said this was group for "professionals only" and homemoaners (sic) were not welcome here. Well my sampling of "professionals" on that group does not speak well of their competence and people skills. They do not seem to realize that basic refrigeration and heating is quite simple. The complexity comes from the newer electronic controls and they know nothing about that other than swap things until it works. A case in point was a neighbor that called a professional because the blower motor in the furnace had stopped working. The "pro" said the motor controller was bad, the board was no longer available, so both the motor and controller needed replacing for $800. The neighbor is a bit of a handyman so I asked him to bring the control board to my house and I would look it over. One look and it was obvious that there was a bad solder joint on the line input common mode choke coil and a bit of solder restored it completely. I will bet not one in a hundred of these "pros" even know what a common mode choke is.

David

David

Or that broken solder joints are quite common failures.

Yes, cold solder joints are a common problem. GE refrigerators are another example of this. A friend of mine is a computer repairman, so I've given him a couple GE boards to remelt. Havn't used them in the field yet, but I'm guessing they are fine.

I'm glad you were able to repair the board.

I've also noticed a severe lack of manners. Sadly, so. Not sure what's that all about.

The blinker fluid reservoir is right next to the back seat choke.

I remember TV repairmen, and the most prominent memory, other than that tube caddy and their genial personalities, was the B.O.

Thanks, Rich

I was reading a review of some computeristic trade show, and the writer was discussing some pitchdrone, who would answer all his questions very enthusiastically, with little or no information: "Yes, yes, we have all the latest features." "But, does it have ventricles?" "Yes, we keep up with all the latest technical advances!" "But, does it have ventricles in the frammistan?"

The writer says, "It was probably "frammistan" that tipped him off that I was messing with him" or some such.

But actually, the first time I heard "Frammistan" was on the "I Love Lucy" show (ca. 1950's), when Lucy and Ethel were trying to scam somebody, by impersonating the "Maharincess of Frammistan".

Or maybe "Franistan." ;-)

Cheers! Rich

I've also heard that called the "three-pronged blivet"

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the "Mad POIUYT."
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But "veeblefork?" That's a new one on me! ;-P

Cheers! Rich

In USAF electronics tech school, we used to send the newbies out for a bucket of prop wash, 20 ft. of flight line, a cup of grid-leak bias, and when doing the floor, a buffer amplifier. ;-)

Some guy actually came back with a cup of some pink liquid, which they had told him was "grid-leak bias."

And then there's the guy who wanted to borrow a Crescent wrench, and the shop guy asked, "Metric or standard?" ;-)

Cheers! Rich

Its closely related to, but totally different from the famed veeblefetzer.

Gunner

I am the Sword of my Family and the Shield of my Nation. If sent, I will crush everything you have built, burn everything you love, and kill every one of you. (Hebrew quote)

That, plus the Yellow Pages are so quaint...

Do you have a web site? (The new Yellow Pages)

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