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R410A replacement - Page 2

post #11 of 16
Thread Starter 
Dont know how big the small rotary compressor is, it only rated at 175w.rolleyes.gif

I have got most of the tools i need i think; R134a Can Tap, flaring tool set, A/C Gauge Set, bullet line tap, A/C Can Tap tool, Schrader valves, map torch, as for vacuum pump i was thinking fridge compressor?

I know its cheaper to just buy a unit, but i really like to learn new things and consider it as a hobby biggrin.gif
So getting the gas is just pumping the gas over to a bottle with a vacuum pump, how about air in the system (hoses, pump) just purge out some before connecting the bottle?
Edited by Octygam - 12/27/10 at 4:32am
post #12 of 16
if u get 2 vampire valves biggrin.gif u can force the system to recover it self

one valve on the hi side right after the condy one valve on the low side right near the pump with a vise grip pinch the cap tube ,

have a ready vact cyl such as a bbq tank or a helium tank with the gage set hook t up and the tank at a nice vac hook up the yellow hose to the hi side vamp valve but have the yellow hose slightly loose near the gage apply the vamp valve to the hi side and u will hear a his at the loose hose connection near the gage after a few seconds snug it up ,open the valve on the gage and ur recovering have the bbq tank in a bucket with ice water any gas will want to go chill where its cold second valve will go near the pump on the low side apply the valve have the hose loose near the small propane cyl after it hisses for a few seconds snug it up open the propane valve to a really slow flow and start the system up and pinch the cap tube this will push all the gas out of the system into the bbq tank with maybe about 1-2% propane after about 1/2 min ur done the system now only has propane inside it and u can shut it down and close the bbq tank valve at the same time

u can vent the propane from the system as it will brake down in the air in about 14days vs r22 around 40+yr lol

vacuum pump can be made out of a rotary compressor but it wont last long and it will not pull as hard as the vane pumps u can buy on ebay for 50$

this is by no means the right way to do it its the ghetto cheap way to do it but it works and if u mess something up it can kill u or at the very least burn ur place down if u are not sure if u can do it maybe do a bit of reading if u still are not sure then leave it but if u are a person that has common scene u will do just fine biggrin.gif
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post #13 of 16
If you can get a pair of compressors in series (pumping one into the next into the air) you'll get a 'reasonable' vac. Not great, but it's way better to have nitrogen with that setup, so you can vac, then put a bit of nitrogen in, then revac. Helps get the moisture out much better.

A single compressor can get the gas that's in a system into a bottle, but a real recovery station is always way better. Just like he'd said, same as using the system to 'recover itself' but in the suction, out the discharge, into the bottle. Just not ideal, since you'll spit a bit of oil into the recovery bottle. Not the end of the world, a lot of recovery stations don't have oil separation.

Nice to have lines with shut off valves for recovering, you can stop the stuff in the line from venting that way.

If you had a rotary 'to spare', they tend to pull a better vacuum that recips.

Most Dehumidifier's I've seen are around 1/2hp, but if you get the LRA or can get a model number and at least get the CC's of it, pretty easy to estimate what it is. 175w sounds small, but a compressor that's not working that hard, will pull less power. Dehumid's don't need to work hard, just remove moisture. Depends on how they set it up.

Sounds like you're on your way, time to do a little reading, make sure you're familiar with what you need to do, so when you're setting things up you know what your next move is.

And of course, here to help smile.gif


Gray
post #14 of 16
Oh, but you're quite right. Vac pumps, treated right and used properly will do the job a long time. Running a compressor for 24hrs pulling a vac is pretty hard on it. Won't take that long (impossible to say though) it will last, but if you have a decent supply of old crappy compressor to do it, then it's not that big a deal if they break biggrin.gif


Gray
post #15 of 16
Thread Starter 
One more question, is it okay to fit the biggest condenser possible or do i need to take any precautions about condenser size?
post #16 of 16
Quote:
Originally Posted by Octygam;12232419 
One more question, is it okay to fit the biggest condenser possible or do i need to take any precautions about condenser size?

if u have tons of space u can go as big as u like bigger condy will disapate more heat at a faster rate or a big condy can be set up with a big slow fan that makes almost no noise but performs like a smaller condy with a really loud fan

but u will have to rig up a fan with a shroud so it moves the air over the whole surface of the condy cause if u just put a small fan in the center the rest of the condy will not do any work so it will be pointless

dont be shy to ask questions even if u think ppl will laghf at u cause its better to ask a silly question then build something silly
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