r-414

[freonjohn]

Anyone have experience with this refrigerant? Will i have to change expansion valve when converting from r-12? This is a low temp. box that someone else has put 414 in and she won't pull down below 15deg. Seems like there is no way to use sight glass. When bubbles clear it is overcharged.Is there a better choice for refirgerants to convert from r-12?

[ckr74]

Could be that you may have other problems. I use 414 in all the old R-12 systems. No problems yet.Some of them been going 4 years now. Give us more info.

[freonjohn]

i haven't gotten into the system yet. it is a new customer that has had someone else working on it. they replaced a suction drier because it had been left on there so long it rusted out. the condensing unit is outside and i had between 25 and 30lb. suction, 180lb. head. When i cleared the sight glass it flooded back. the last guy attached the liquid line to the suction line as a heat exchanger. the pressures seem highe than r-12 so i was wondering if the expansion valve was compatible. the unit is dirty, has leaks, and very poor brazing. my question is should i keep the same txv while i repair the other problems? I have seen a lot of people use mp39 that caused a lot of the old r-12 systems to lose compressors because of excesive head pressure. is the 414 the best replacement for the 12?

[dorrmann]

I use Hot Shot all the time as a 12 replacement. You don't have to change the TXV. You got a good handle on it...don't clear the sightglass, etc.

Just make sure you charge with the bottle upright. It's different than the rest of the blends. I've caught myself doing that a couple times. My mind says "turn it upside down," but then I realize that isn't correct.

[dadaddy]

I feel like I am beating a Dead Horse - I keep telling you guys MAXIFRIG does much better - Much colder, they say its something to do w/ the head pressure - With our coolers my amateur nephew puts it my low temp units and in 3 years everything perfect w/ no comp failures - NEGITIVES = It is only available direct from them and they are difficult to get along with = BUT, Hey no price increases so far and it works terrific so we get 22 & 502 also - Good Luck Guys ............

[270wsm]

I use Hot Shot all the time as a 12 replacement. You don't have to change the TXV. You got a good handle on it...don't clear the sightglass, etc.

Just make sure you charge with the bottle upright. It's different than the rest of the blends. I've caught myself doing that a couple times. My mind says "turn it upside down," but then I realize that isn't correct.

All the jugs of hotshot I have bought have to be turned upside down. Better to read the jug than do it wrong.

[k-fridge]

This is a low temp. box that someone else has put 414 in and she won't pull down below 15deg.

That's typical for a low temp system with 414b. Hot Snot will do a decent job for medium temp but is terrible for low temp. The ONLY good alternative for a low temp R-12 system is MP-66.

And forget about the "don't fill the site glass crap", it the site glass isn't full you're not getting a full column of liquid to the TXV....period! Anyone that tells you any different either dunno what they're talking about or they work for ICOR.

[rayr]

Agreed with K-fridge. There is NOT an expansiion valve on the market yet that works well not having a full column of liquid to it. PERIOD!!!!

[k-fridge]

But you can probably use the same TXV if it was the correct one to begin with. After you fill the site glass (subtle hint) and get the box close to temp, check the SH and adjust as needed. It's fairly common when switching to blends that the TXV will need closed a bit.

You should be running at least 1/2 AB oil in the compressor with MP-66 unless it's a close coupled system.

[markettech]

And forget about the "don't fill the site glass crap", it the site glass isn't full you're not getting a full column of liquid to the TXV....period! Anyone that tells you any different either dunno what they're talking about or they work for ICOR.

This just keeps coming up - donit

A guy should make a YES THE LL SIGHT GLASS NEEDS TO BE CLEAR sticky thread

[Biblepoet]

This just keeps coming up - donit

A guy should make a YES THE LL SIGHT GLASS NEEDS TO BE CLEAR sticky thread

Ya tryin' to put the rest of us out of a job when the others muck up?

B-

[markettech]

Ya tryin' to put the rest of us out of a job when the others muck up?

B-

[k-fridge]

This just keeps coming up - donit

A guy should make a YES THE LL SIGHT GLASS NEEDS TO BE CLEAR sticky thread

It absolutely amazes me that so many people believe this junk. And people wonder why I have issue with a certain refrigerant manufacturer.