TRADES THREAD (not so secret Yonic HVAC Chronicles Blog thread)

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User Info: YonicBoom

YonicBoom
4 weeks ago#51
Day 10:

Not a single fan was disassembled.
https://i.imgur.com/C68XoA0h.jpg
https://i.imgur.com/1wTqXr0h.jpg
https://i.imgur.com/GjI3rSHh.jpg
https://i.imgur.com/19RPOBAh.jpg

Break out the recovery pumps, hook up your manifold gauges, and get ready to PURGE YOUR LINES. 10 in/hg vacuum is all that's required to put a smile on the EPA's face when sucking the soul out of a recovery tank, but you'll wanna go make some tea or something while you wait because it takes an AGE to reach that golden number. God help you if you have a leaky Schrader valve pulling air in and undoing all your hard waiting.

It was fun. The order in which you do things is exceedingly important, but it's 100% logical. #1 failure was closing the valve on the tank you were transferring the refrigerant to BEFORE turning off the recovery pump. #1 cool thing was watching the frost build up on the bottom of the tank you were pulling refrigerant from. As long as you follow the flow of the refrigerant it's difficult to screw up.

Nobody got frozen, nobody caused any explosions, all went pretty well.

Extra: I got to class a bit early and asked the professor if there was anything I could do while I was waiting for class to start. He brought over a recovery pump with its power cord snipped off and said "make it work, I know about as much as you do about this thing." Since I'm still working on electrical stuff, I asked one of the former military guys who did electrical all the time to walk me through fixing it. With a few good pieces of advice and several continuity tests to make sure the thing was wired up right, I got the thing running... only to learn that it had a seized motor. There was a reason the power cord was removed (and used for something else somewhere down the line). However, I learned a lot and enjoyed it quite a bit. My confidence with electrical grows with each passing day.
All these boomas like me.
https://www.youtube.com/watch?v=VVkkHVl8QvE

User Info: YonicBoom

YonicBoom
4 weeks ago#52
Day 11:

Haven't been sleeping well lately, so I didn't feel like updating this when I got home last night. No pics either because I forgot, oh well.

Tested compressors to determine whether they're good or shot. You get 3 terminals to test. One of them = Start windings, one of them = Run windings, the other = Common. Set your meter to Ohms and even if your terminals are un-labeled, a bit of common sense will show you the way.

Of your 3 readings, on a GOOD compressor you'll get:
Run+Common = your lowest resistance (run windings are thicker, shorter wires)
Start+Common = Your middle resistance (Start windings are thinner, longer wires)
Run+Start = Your highest resistance (since you go across a f***ton of wires, more resistance)

Assuming those read normally, you then find a bare metal spot on the compressor case and test each terminal to see if it's grounding to the case. If it is, you'll know pretty fast because you'll either have ridiculously high resistances on one/both of your windings when you test those or you'll get any reading at all when you test the case. Basically any reading besides "open" = RIP compressor.

Other things that can happen:
- Run+Start windings can short out to each other, they will read the same when you test them OR you'll get really strange readings that make no sense whatsoever when conducting your other tests
- Things can simply be broken and you can get open readings between terminals (often this is the overload safety switch that pops in the event of overheating/overcurrent)

While testing can offer up useful information, if anything is wrong at all you're binning that compressor.

Yeah. I'm heading to class in a few minutes. Hopefully tonight's another fun one.
All these boomas like me.
https://www.youtube.com/watch?v=VVkkHVl8QvE

User Info: gwwak

gwwak
4 weeks ago#53
So how useful is duct tape for the trades? It is usually the first and only thing I grab when something breaks.
Hardcore - We'll probably be modded for this...
Come visit The Range http://www.gamefaqs.com/boards/1003-

User Info: YonicBoom

YonicBoom
4 weeks ago#54
Day 12:

Went into the shop and did more refrigerant recovery practice. Prof wants to make sure we can all hook everything up with confidence. It's easy enough. The waiting is the hard part. Pulled apart some fans from their motors while waiting for the refrigerant to get moved from tank A to tank B, only half of them survived because some had been screwed up pretty badly beforehand.

One of the recovery tanks had a leaky vapor valve and decided to spew out all of its contents after being filled up most of the way. Wasn't the one I was working on, but it was pretty amusing when the guy who was using it disconnected the hose from the tank (normally results in a little bit of residual refrigerant spewing from the hose) and it just didn't stop. I guess that's why they say to inspect recovery tanks daily.

Otherwise... just studying for the EPA 608 test and getting ahead on my online/homework stuff. I'd start studying for the other cert tests but the professor insists that we don't touch that until after taking the 608, as some of the terminology gets changed up a bit from what is used on the 608 test. Also, the other certs are OPEN BOOK TESTS which is kind of nice.

gwwak posted...
So how useful is duct tape for the trades? It is usually the first and only thing I grab when something breaks.

Haven't used it once yet, though electrical tape has been very useful. As this is HVAC I'm sure that DUCT tape will have its uses later on once we delve into that side of things.
All these boomas like me.
https://www.youtube.com/watch?v=VVkkHVl8QvE

User Info: coolsurfer800

coolsurfer800
4 weeks ago#55
Duct/duck tape is useless but you will need aluminum foil tape to seal up duct joints.
No, John. You are the demons.
Moms are tough.

User Info: nickels

nickels
4 weeks ago#56
Yeah, duct tape is useless. Foil tape however, yeah you'll be usin that.
just a few miles from where the lesbian truck was
Albtraum13

User Info: Albtraum13

Albtraum13
4 weeks ago#57
I have foil tape, the foil tape with strings in it, and UV-resistant lineset tape in my truck, all serve as cup holders until theyre needed for their own specific task. The tape with strings criss-crossed in it is for sealing and patching duct work. Using regular duct tape for duct will fail inspection

User Info: gwwak

gwwak
4 weeks ago#58
I used duct tape to fix stairs.
Hardcore - We'll probably be modded for this...
Come visit The Range http://www.gamefaqs.com/boards/1003-

User Info: YonicBoom

YonicBoom
3 weeks ago#59
gwwak posted...
I used duct tape to fix stairs.

How'd that work out for you?
All these boomas like me.
https://www.youtube.com/watch?v=VVkkHVl8QvE

User Info: gwwak

gwwak
3 weeks ago#60
They are pretty wobbly. I also used some cord too. Overall, would not recommend.
Hardcore - We'll probably be modded for this...
Come visit The Range http://www.gamefaqs.com/boards/1003-
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