older ice cream freezer.....

[Diceman]

Like the kind in old time soda shops. But pretty neat looking unit.
Bascially a chest freezer with built in soda dispenser.
Called about melting ice cream.
R-22, has CPR valve. Suction at 50 on start up, pulls down to near 40 after a bit, I recharged it, cleared the glass, cleaned it and head press about 200.
Nice frost pattern in the box but seems that suction should be lower.
Lot of ice on the compessor suction valve, I am thinking the cpr is shot.
Hoping it will get low temp over night.
hmmmmmmmmmm??

[cyro]

If that is an OEM Singer/Johnson CP valve they are obsolete. If I REMEMBER # IS- 235-209 FOR R22 AND 235-206 FOR R-12

I should have a crate full of them used but good if you need one N/C

They are flare 1/2"

They only wonder 1/2 psi from set point, Sporlans wonder way too much from set point which will freeze your soda water.

[Diceman]

The soda thingy has it's own unit. This is only for the freezer.
What do you think about those pressures??
I am not used to R-22 for a freezer, been awhile.
Yeah, it appears to be a 1/2" flare valve.
Thanks.

[icemeister]

On a typical low temp system the CPR should be set somewhere around the upper limit of the suction pressure range for the compressor which is usually approximately 10F, or for R22 about 30# or so, to prevent overloading the compressor. If it is in fact a LT pump and you're running 40#-50# suction pressure, I'd expect the compressor to be running above the RLA.

With those pressures I'd also suspect bad valves. What's the compressor make/model? A quick check of the performance curve for that compressor will tell if it's doing what it's supposed to be doing.

[Diceman]

I considered it but I just don't think the pump is bad, it's pumping good head pressure and drawing amps.
This thing has been fooled with for years, not sure what the deal is at this point.

[frozensolid]

Ice makes a good point about the comp dice. At that suction it should have a lot higher head if it's a LT. Also amps should be over RLA. You may have a a valve bleeding enough to get some amps and pressure but not enough to keep suction low.

What temp is the compressor and the Discharge temp.

Also change the gas it may be mixed.

I am not really familiar with that machine, so just a guess.

[Diceman]

Ya know, it crossed my mind this afternoon that someone may have changed or messed around with the type of gas in that thing.
The previous owner said the unit was constantly being worked on.
I think at this point, I agree the pump is failing.
Not sure this unit is work fixing, we'll see.
Thanks for the input guys.
Ice Cube finally gives some good advice..........:eek: :D

[k-fridge]

First thing I'd do is check to see if that compressor is rated for R-22 low temp. Since you stated that it has a site glass I'm assuming it is a TXV, check to see if it's an R-22 valve also. Given the age of that critter I'm wondering if someone dumped 22 in an old R-12 unit.

if the compressor and valve is R-22, yeah the suction is too high. Maybe bad valves. I'd find out what that thing is supposed to run on before I replaced it though. R-22 is not a great low temp refrigerant.

[Diceman]

It was made for R-22, on the nametag and even a sticker on the unit saying it was. Unless someone put some 502 or 408 or 404 or something else in there.
Oh well, eff it, the guy is going to buy a new one.........good.
Even if I changed the pump, txv, cpr and whatever, there is no guarantee the evap coil, which is built into the cabinet, is not leaking, and that would suck.
I agree about R-22 in a freezer, why use it with so many other freeeezones available?
He just bought this place, I checked everything over, cleaned it and told him to be ready to buy some new stuff and not waste a lot of money fixing the old stuff first.
We both agreed that we don't want to see a lot of each other in the coming months.:D

[Dowadudda]

Like the kind in old time soda shops. But pretty neat looking unit.
Bascially a chest freezer with built in soda dispenser.
Called about melting ice cream.
R-22, has CPR valve. Suction at 50 on start up, pulls down to near 40 after a bit, I recharged it, cleared the glass, cleaned it and head press about 200.
Nice frost pattern in the box but seems that suction should be lower.
Lot of ice on the compessor suction valve, I am thinking the cpr is shot.
Hoping it will get low temp over night.
hmmmmmmmmmm??


what about a cpr are you thinking could be bad in this case? It's not. Not according to what your saying and I am reading. Too little, way too little information.

[Diceman]

what about a cpr are you thinking could be bad in this case? It's not. Not according to what your saying and I am reading. Too little, way too little information.
I think the compressor is going bad.
Ya know how they become refrigerators instead of freezers.:D