New Evaporator and condenser installed . R-22

[808jib]

Hi guys. I just change out a evaporator and a condenser for a w/in ref. I notice the txv outlet is frosting where the spider going to coil. I running R-22 and my pressure is 50psi suction and 260 high side. Site glass is clear and temperature is 40- 38 F. It was running good for a week and the evaporator ice up. I deice coil and everything looks ok except frosting coming out the txv. Is this normal for r-22 ? Thanks Eric

[trippintl0]

Hi guys. I just change out a evaporator and a condenser for a w/in ref. I notice the txv outlet is frosting where the spider going to coil. I running R-22 and my pressure is 50psi suction and 260 high side. Site glass is clear and temperature is 40- 38 F. It was running good for a week and the evaporator ice up. I deice coil and everything looks ok except frosting coming out the txv. Is this normal for r-22 ? Thanks Eric

Yes. Has nothing to do with R22. It is normal for anything below 32*f to frost.

[cboe]

Put a defrost clock on it!

[Tommy knocker]

Check the box for infiltration. Warm moist air will suck into the box through any opening and freeze on the coil. Check door gaskets and penetrations for line sets and electrical. Also check door closure and latch that they close and hold door sealed. Usually don't need defrost on coolers however if your box is beat up and full of gaps it may be the most cost effective solution as long as it makes set point. Oh ya and tell them not to prop door open.

[teddy bear]

Hi guys. I just change out a evaporator and a condenser for a w/in ref. I notice the txv outlet is frosting where the spider going to coil. I running R-22 and my pressure is 50psi suction and 260 high side. Site glass is clear and temperature is 40- 38 F. It was running good for a week and the evaporator ice up. I deice coil and everything looks ok except frosting coming out the txv. Is this normal for r-22 ? Thanks Eric

Could be low air flow through the cooling coil. This basic. Increase the air flow through the coil.
Regards TB

[Russ57]

Wouldn't hurt to check evap superheat. Might need to open up the txv a bit.

[808jib]

I notice some r-22 meduim temp system some sweat coming out the txv and some frost. I know r-12 doesnt frost.

[808jib]

Put a defrost clock on it!

Usually Meduim temp does not require defrost timer since temperature is above 32F.

[2sac]

Usually Meduim temp does not require defrost timer since temperature is above 32F.

In a perfect world.

[Phase Loss]

I notice some r-22 meduim temp system some sweat coming out the txv and some frost. I know r-12 doesnt frost.

Can you explain more about this phenomenon?

[j3hvac]

In a perfect world.

I agree. I service 2 walk in coolers and 2 walk in freezers. Two run r12 and two r22. All have defrost timers. If the cooler was installed charged and left alone it probably would be fine. As soon as you add people into the mix it is over. They can't seem to close the doors! Not to mention plastic and all sorts of other trash that gets on the coil.

[808jib]

How many defrost time you put per day and how long ?

[jackintheboxtec]

I usually put it for 15min 3 times during the day and 30-35 min about 2:00am.

I work for a fast food company that is not open 24hrs they leave around mid night so the 30-35min at that time is ok because no one is opening the door.
Never iced up again.

[ar_hvac_man]

I notice some r-22 meduim temp system some sweat coming out the txv and some frost. I know r-12 doesnt frost.

Huh?

[808jib]

I usually put it for 15min 3 times during the day and 30-35 min about 2:00am.

I work for a fast food company that is not open 24hrs they leave around mid night so the 30-35min at that time is ok because no one is opening the door.
Never iced up again.

Do you work at jack in the box ? I work at jack in the box, but they are 24 hrs. We have a internal auditor comes every quarter and check food saftey.Temperature of w/in ref have to be 41F or below. If it 41.1F. Store calls me and have to be there in a hour. Otherwise they have to throw the food away.

[jpsmith1cm]

Very little of the information that you have provided is useful.

You've given us a suction and head pressure and that the sightglass is full.

Given this information, I'm a little concerned. 50 PSIG seems a bit on the high side for a WI cooler.


With a 26 degree coil temperature, frost is inevitable. It is how we deal with it that we're concerned with.

What is the primary control? What is the defrost control? How are they set?

Have you measured superheat? What is it?

[jackintheboxtec]

Do you work at jack in the box ? I work at jack in the box, but they are 24 hrs. We have a internal auditor comes every quarter and check food saftey.Temperature of w/in ref have to be 41F or below. If it 41.1F. Store calls me and have to be there in a hour. Otherwise they have to throw the food away.

Not any more, Got laid off last year.

You must work for a franchise? Because they closed the corporate facilities department last May.

[lsu4life]

Yes I agree on the opening of doors of cooler. Most times we got calls was everytime the delivery truck came and the door is left open never shut and sucks in hot air from kitchen then it freezes up and they call it aint working. Defrost it and it works good again until next delivery day.

[808jib]

What area you was working at ? I work in franchise in Hawaii. It use to be corperate. We was the first one to get franchise in 2006.

[jackintheboxtec]

I worked in the So-Cal area.

You probably know a guy named Salem? Corporate sent him over ther to train you guys on some of the equipment a few years ago.