Thread: Regas with Hychill -30

Originally Posted by Blknight.aus

nahh if all your hardware is original spec and you have the original charge weight stickered onto the system then you just need a look up..

heres the marketing blurb for your chosen gas, but helpfully they have all the real techy data in tact at the end. (including how to do the charge by weight and by volume....

the very short version, there are some marketing blurb errors in their advertising "how goods this ****" phase...

its a lighter gas (lower density) its going to flow around the system at a fantastic rate so,

If your compressor isnt 100% (leaking valves/ports) or your TX valve is sticking open preventing pressure build up in the condesnor and receiver
you're going to notice the hychil wont cool the car as well (Same goes for low engine speeds)

you'll also notice the hycill will be less effective more quickly if you have a minor leak (made up exaggerated numbers for example only here) of you loose 50% of the hychil you might lose up to 70% of the cooling capacity whereas the R134 will still be running around the 75% mark...

oh just as by the by...

Hit and miss is a type of governor...

Tradesmen use fact, experience and intuition.

I've found hychill seems leak less than the R134a.... I don't think anyone claims it's a miracle cure for anything. There's no way I'd touch a working modern R134a system...

I'm talking old R12 systems, they generally suck big time with R134a in them. A larger condenser would probably help for starters.... Or you could just put any hychill type refrigerant in there.

If I loose say 50% charge from my old cars over 2years.... I'd be tickled pink. I'll stick another $7.00 of hychill in and keep motoring. I've filled countless LPG gas bottles and with each bottle I fill I'm sure I release more LPG into the atmosphere than my car would leak over the years for the next century It's not toxic like R134a remember.

It's simply a readily available, safe(ish) refrigerant that can be used by anyone. It's no more dangerous than your bbq gas.

Pretty sure Blknight has nailed it, for filling without charge weight. Remember devide his amount by 1/3rd for hychill. Check the downloads from the hychill website. They also have guides for filling without a known charge weight

I'm pleased we have an A/C guy on here, I'm madly trying to understand everything you saying. I'm a firmly believe you need to understand how something works in order to fix it.

seeya,
Shane L.

What is the story with sight-glasses and R600/R290?

Originally Posted by Dougal

What is the story with sight-glasses and R600/R290?

Bottom line is that you can easily overcharge any system if charging by the sight glass, and that includes large commercial refrig installations.

You just need to pay attention to the discharge pressure, (that it's high enough, if conditions are cool and the discharge pressure is too low it needs to be artificially raised) suction pressure and superheat and/or the sweat back on the suction line.

Originally Posted by DoubleChevron

I'm pleased we have an A/C guy on here, I'm madly trying to understand everything you saying. I'm a firmly believe you need to understand how something works in order to fix it.

seeya,
Shane L.

Well for starters you don't need a thermometer in the condenser and evaporator as Dave advocates if you have gauges connected to the system.

There's this funny but basic thing that any refrig/a-c mechanic uses on each job called a pressure/temperature relationship.

Download a PT chart and print it out for the refrigerant you are using.
The pressure drops involved on a car a/c will be minimal, so your gauges (if calibrated) are a much more accurate way of ascertaining condensing and evaporator temps.

A thermometer at the TXV feeler bulb would be handy (but mostly impractical on car a/c's) to check the superheat, and one in an outlet is sufficient to check air off temps.

There are at least four real fridgies posting in this thread.

O.K. slightly on topic, I have a part used 9kg bottle of Care 30, a set of gauges, no decanter and a compressed air/venturi vac pump.

My '85 could do with a re-gas, but I'm too timid. Anyone in Sydney a fridgy who'd like to do it?

Probably still need to recondition/replace the York compressor but that may be able to wait.

I think we're everywhere but Sydney Diana!

sent from a hand held thingy via magic invisible waves......

besides you're probably in the middle of a latte somewhere--

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