Testing Fujitsu AOT17RNA Coindensing unit - Ohming Rotary Compressor

[cheetawolf]

i recently got an old fridge compressor which im not planning to cut open and burn out. maybe i can over pressure plastic bottles and things :P

[Aussie50]

@cheetawolf lol yeha :D, I always thought about doing over pressure tests on things except it would have the police here because I'm making explosions :(

[animebsd]

hey how hot deos it get there?

and also whats the humidity like there? what %?

do you guys have swamp coolers aka evaporative coolers?

i just built one and posted a vid

u should check it out

once again its a really simple machine

[Aussie50]

@animebsd pretty hot, 46*c is what I remember it getting to last sumer.

Humidity isn't too bad down south and we do run Evap coolers a lot too, but I hate them since their not crispy cold and most often get neglected and breed germs.

but Evap coolers do work here.

[animebsd]

@Aussie50 oh ok cool!

yea i do know what you meen haha

[TehMG]

Interesting. Around here black is usually "hot" and white is "neutral"/common.

[Aussie50]

@TehMG yeha, big difference between Aus and US/Canada power codes.

Red/Brown is Active 240V

Black/Blue or White is Grounding (Neutral)

green is always Earth.

but you have Center tap transformers that give you 2X 120V legs going toi the center tap plus 240 across both active legs.

[bdixon86]

It seems like all the ac units you get are about 2 ton capacity. Do you ever see larger condensing units like 4 or 5 tons and are mos of them heat pumps?

I'm from Chicago in the US and all i usually see are large 2.5 to 5 ton AC units and no heat pumps. Our climate range is from 95F(35C) to 0F(-17).

[Aussie50]

@bdixon86 yeah my average haul consists of 1 - 3 ton units, occasionally a 4 - 5 ton one.

we do get big ones but the company I puck up from deals mainly in small units/residential/commercial.

biggest I had was 20ton and it was a monster!.

[chrisgj198]

One reason why the comon-start and common-run readings might not quite add up to the start-run reading would be if there is some resistance in the multimeter test leads, or if there is a bit of oxidation on the terminals. It can be pretty hard to get the test lead resistance less than 0.2 or 0.1 Ohm, but if you need that kind of accuracy you can use a 4-terminal ohm meter with force and sense leads, (called a Kelvin connection).

[Aussie50]

@chrisgj198 thats a very good point!, my DMM is pretty old and it would explain the slight difference I get when ohming compressors.

[airconguy1]

Nice stuff. You ever heard of Fujin? Those fujitsus are pretty reliable!

[Aussie50]

@airconguy1 yeah the old Fujitsu's are very good

never herd of Fujin but its probably a chinese generic unit re-branded..

[airconguy1]

@Aussie50 Yep, I would expect that thing to die soon. But it does a darn good job at heating AND cooling! On high fan the thing literally blows everyone away. (The tech said they needed a unit that big!). It is getting on about 3 years now! But the thing is quite noisy-not fan wise, the refrigerator going through the evaporator makes a bit of a hiss-as do the larger units

[V8Jagnut]

cool vid. you know what the greek rule of thumb is.lmao. commen only is the one that is commen to all parts.lol.

[Aussie50]

@V8Jagnut lol yeah, as I said, being alternating current it really dosn't matter.

[V8Jagnut]

@Aussie50 lmao yer.

[russelD9]

thats like the one i am after. I will be getting one soon.

[riverside03]

I have never seen a start relay on a airconditioner, the start winding is actually in all the time same as run winding and the cap is a run cap !

[Aussie50]

@riverside03 I have seen a few, but they are rare. some old Toshiba window units have a relay and start cap, as do many larger single phase splits. like the Daewoo/Email that detonated its start cap because of a short comp.