[jimpad]

I'm having some problems with my new to me freezer. I had a tech out and he didn't seem to know much but added a little freon. After he left I noticed evap was frozen, defrosted for 20 mins and it seems to be doing better... it's at 10 degf after 8 hours. In going over this thing i'm mystified my the device in the picture... it's at a elbow on the return line... there's a threaded cover and under the cover is a allen screw adjustment? What does it do?

 

[I.C.E.]

That is a Suction Pressure regulating valve, or CPR.
Its there to prevent slugging to the compressor by keeping the suction at a preset (you can adjust it, take off the top to access) pressure.
Yep, they can fail, but it is rare.

Hope this helps!

 

[jimpad]

What is the thinking on how to adjust it? My evap is at 10 degf and i've got icing on the return line and at the return connection at the compressor. Don't know if the icing is a problem or not... I'm a complete novice.
.
.

 

[rjk_cmh]

It's a freezer, of course the suction line is going to ice up unless you properly insulate it. We can't really diagnose any other issue over the internet unless you can provide all the numbers (pressures, temps, etc).

Also, if your tech left you with an iced over evap, it doesn't sound like he did his job. Can't get accurate charge info without a proper load, and an iced up evap isn't going to present an accurate load to the system.

 

[I.C.E.]

Absolutely right. I had blinders on and missed the part where he said "I had a tech out". Unintentional, but all I can do is apologize and read better.
It is my second day. I was just trying to give back some of what the site has given me. Sorry.

 

[2sac]

Absolutely right. I had blinders on and missed the part where he said "I had a tech out". Unintentional, but all I can do is apologize and read better.
It is my second day. I was just trying to give back some of what the site has given me. Sorry.

No harm no foul. You have 15 posts, apply for pro membership. The pro forums are locked and you can discuss things in depth.

 

[jimpad]

Thanks for the help. Not sure what yall are going back and forth about but I really appreciate the help.

Yea, I'm disappointed in the tech to say the least... he was really good at running my credit card though.

So, how do I determine if overload at startup. I've got a clampon ammeter and can check amps but isn't 6.5 times rla typical for induction motor... so do is that what I'm looking for?

How does that valve keep oil in the compressor when it's on the suction side?
So, is the idea behind the valve that when compressor is off, liquid will somehow fill the piping upstream of the valve and when the compressor starts the valve acts as an expansion device to create gas downstream of valve?

 

[I.C.E.]

2sac kindly pointed out that I was unintentionally helping a DIY person, and that I should not by rules of this site. I apologize for getting ahead of myself on this once again. There are forums here specific to your needs, and the answers you are looking for can't come from me. Thank you for understanding!

 

[TechmanTerry]

In order to set/check the setting of a CPR/CRO valve, don't you need 3 readings??? Amps/Before/After CRO press????

 

[2sac]

Thanks for the help. Not sure what yall are going back and forth about but I really appreciate the help.

Yea, I'm disappointed in the tech to say the least... he was really good at running my credit card though.

So, how do I determine if overload at startup. I've got a clampon ammeter and can check amps but isn't 6.5 times rla typical for induction motor... so do is that what I'm looking for?

How does that valve keep oil in the compressor when it's on the suction side?
So, is the idea behind the valve that when compressor is off, liquid will somehow fill the piping upstream of the valve and when the compressor starts the valve acts as an expansion device to create gas downstream of valve?

Why would you spend money on a freezer without knowing if it worked or not? Now, you automatically blame a device, that you have no clue how it operates, for your troubles. Maybe you should have done a little more research prior to purchasing the freezer, and again when choosing a company to perform the repairs. Sporlan has PDF's available online that will tell you the purpose of the valve. Lastly, if you're coil is freezing up, it is my belief you are barking up the wrong tree.

 

[jimpad]

Why would you spend money on a freezer without knowing if it worked or not? Now, you automatically blame a device, that you have no clue how it operates, for your troubles. Maybe you should have done a little more research prior to purchasing the freezer, and again when choosing a company to perform the repairs. Sporlan has PDF's available online that will tell you the purpose of the valve. Lastly, if you're coil is freezing up, it is my belief you are barking up the wrong tree.

You serious?

 

[Snapperhead]

.

 

[Snapperhead]

Yes he is serious, it is normal for the coil to get Frosty after 1 hour and continues to stay frosty until the next defrost 6 hours later. After this defrost the coil will become sparkly clean again, assuming your defrost is working properly. Your next step is to check the coil by the compressor, take a flashlight and look into the coil really good to make sure there is no dust inside fins blocking air flow. If you find enough dust to cause alarm, go to the hardware store and get a $10 pump sprayer and some Windex.

Unless you have gauges and a thermometer that can check pipe temperatures there's really not much else you can do Beyond this

 

[2sac]

You serious?

Sorry but, if im buying something used, I'm going to be damn sure it operates correctly prior to handing over my hard earned cash. The fact that you did not do that along with implying the tech, who YOU called, took more of your money without fixing the issue which brought you here looking for free advice, solidifies the fact that you are cheap and ignorant or cheap and naive. Either way, it is you that made the poor decisions.

 

[TechmanTerry]

That is a Suction Pressure regulating valve, or CPR.
Its there to prevent slugging to the compressor by keeping the suction at a preset (you can adjust it, take off the top to access) pressure.
Yep, they can fail, but it is rare.

Hope this helps!

How does the CRO prevent slugging to the comp? When does this slugging take place?

Then in Post #4 ,the CPR/CRO prevents oil from leaving the comp?

Sporlan does not mention that in their Bulletin #90-10. I don't recall reading about these applications for a CPR in the Alco book or even in RSES. So, please help me out here.Don't break any rules doing it

 

[beenthere]

How does the CRO prevent slugging to the comp? When does this slugging take place?

Then in Post #4 ,the CPR/CRO prevents oil from leaving the comp?

Sporlan does not mention that in their Bulletin #90-10. I don't recall reading about these applications for a CPR in the Alco book or even in RSES. So, please help me out here.Don't break any rules doing it

Ask this in the restricted Pro forums. So I don't have to close this thread, thank you.

 

[TechmanTerry]

Ask this in the restricted Pro forums. So I don't have to close this thread, thank you.

YES SIR! I agree, & thats why I said"Don't break any rules".

He should apply for PRO. And I'm hoping he does, cause I'm interested in the answers.

 

[jimpad]

Sorry but, if im buying something used, I'm going to be damn sure iit operates correctly prior to handing over my hard earned cash. The fact that you did not do that along with implying the tech, who YOU called, took more of your money without fixing the issue which brought you here looking for free advice, solidifies the fact that you are cheap and ignorant or cheap and naive. Either way, it is you that made the poor decisions.

You have absolutely no idea what you're talking about and you're one of the few I've ever interacted with who makes worse assumptions than my wife.

Never said i paid for it
never 'blamed' the valve

Here's some free advice to you... DONT BE A DICK.

 

[2sac]

Sounds like you married a fine lady. We're back to you wanting to do things on the cheap. Were the tech you hired reputable, he would have either fixed it, gave you a diagnosis and a quote to repair, or told you it was a lost cause and to trash it. According to your original post, he did none of the above.

You may see me as being a DICK, and that's fine. I prefer the term "brutally honest". We'll use your terminology, and say I'm a DICK who knows more about freezers than you do.

 

[pecmsg]

You have absolutely no idea what you're talking about and you're one of the few I've ever interacted with who makes worse assumptions than my wife.

Never said i paid for it
never 'blamed' the valve

Here's some free advice to you... DONT BE A #ick.

Come here for advice and who's being a #ick!