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We have a freezer in our Lab building , it stays

We have a walk in Vulcan freezer in our Lab building , it stays at 0 to minus 10 degrees and we are having a problem of it sweating thru the wall. We have had the wall soray with foam to further insulate it but it still sweats through , any ideas ?

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You need to have a vapor barrier installed between the freezer

Posted on Jul 22, 2009

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What is the normal operational pressure in lo/hi side at the compressor of commercial freezer like dispaly case, reach in cabinet or other any low temp refrigeration uses 502 or408A/404a. is there any rule...


why yes there is. Generally speaking, the head pressure should be around the "ambient +30" rule.
That is, measure the entering air temp to the condenser, say 75 degrees. Now add 30 to that and get 105 degrees. Look at a P/T chart and see what the pressure is for that temp which is about 253 for R-404-A.
The evap on a freezer leads the load so, as a general rule, the evap temp is going to be around minus 10 degrees to get a 0 degree box. Coolers are different. So, the pressure for a minus 10 evap is around 25 or so. But the unit has to be close to operating temp. If the box is warm, naturally the pressure is higher. And what influences the pressure is whether or not it's a TXV or a cap tube system.
If a TXV and no receiver, charge by subcooling. If a receiver, fill by sight glass. If Cap tube, charge by superheat.
Hope that answers your question.

Oct 03, 2010 | True 49 cu. ft. / 1388 liter Commercial...

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What should be my pressure on a 404a freezer


usually depends on the temp of the conditioned space. Most freezers run about a minus 10 evap to get a 0 degree box. So look for a low side pressure of about 25. High side is ambient plus 30. A 75 degree ambient, for example, add 30 and get 105 degrees. That, on a P/T chart converts to about 253 psi. Those are approximate but I'm sure you can use this to fugure out what to look for.
let me know if you need more help.

Sep 27, 2010 | Continental Manufacturing Company...

1 Answer

What should the freezer temperature shouls be????????????????


Normally, freezers are at 0 degrees. If you have ice cream, shoot for -10 degrees.

hope this is what you are looking for.

Feb 21, 2010 | Nor-Lake Freezer Norlake Refrigeration 6'...

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Norlake freezer 6x6 not freezing enough


Normally freezers are kept at zero. Most health departments will not allow the temp to be higher than plus 10. If you want to store ice cream, you need to be at minus 10 degrees to minus 15 degrees.

let me know if I can be of any further help.

Sep 29, 2009 | Nor-Lake Freezer Norlake Refrigeration 6'...

1 Answer

Freezer is not freezing it is staying on 30degree


The defrost system has failed and is not de-icing the coil or, the door is not sealing tight or too much time open allowing excess humidity to enter the chamber, thereby overcoming the capabilities of the defrost system. The system has a defrost timer someplace, check to see if it is running. If not, you can probably advance it into a defrost cycle with a screwdriver. (turn the shaft slowly until a click is heard and the system stops) Allow 20 or 30 minutes for the coils to defrost, and restart with the screwdriver if it has not took off on it's own. If the timer is found not running, replace it.

May 25, 2009 | Nor-Lake Freezer Norlake Refrigeration 6'...

1 Answer

FROST AND ALARM LIGHT ON


Your defrost timer, switch or circuit board is probably shot or it would be defrosting.

Use a fridge / freezer thermometer to tell if temperture high (it should be 0 F plus or minus 5 degrees) to determine if it is too high - this is normal if frost builds up but will get worse unless repaired.

May 04, 2009 | Hoover Freezers

1 Answer

Evaporator unit keeps on building ice. question what is the nornal operating pressure on low side and on the high side for truee freezer using 404 refrigerant


I'll try to give you the "Readers Digest" version.
First, make sure there is no ice build up on the evap. Light frost is O.K. as long as it does not effect air flow. (Very Important). All fans need to be running. Again, an air flow thing. There should be some product in the box but not too close to the evap. Again, an air flow thing.
The expansion device can effect your pressures to some degree i.e. Cap tube vs. TXV.
As a general rule of thumb, which I use almost everyday when it comes to pressures:
Low side is based on the temp difference between evap temp and condition space in the box. In freezers, it is almost always 10 degrees. If the box is 0 degrees then the evap needs to be at a minus 10 degrees. That is a pressure for R-404A of 24.5 psi. This only holds true when the temp in the box is approching set temp. I would say, about +10 degrees. 0 Degrees for the evap for R-404A is 33.5 psi.
High side should be ambient temp +30 degrees and then convert to a pressure for the refrigerant.
Example: 75 degrees in the room, +30 degrees equals 105 degrees. Now 105 degrees converted to a R-404A pressure is 253 psi. This will get you very close to the desired high side pressure.
I would look at low side first to see if it is within reason. Don't let the high side get too high. Increases the compression ratio and overworks the compressor.
Your icing problem could be a defrost issue and not a refrigerant charge issue.

Good Luck and hope this gets you started.

Apr 07, 2009 | True 49 cu. ft. / 1388 liter Commercial...

1 Answer

Freezer tempature


Depends on the product you want to keep in the freezer. Usually you want to try and stay between 0 and +10 degrees for most items. Ice Cream must be -10 degrees minimum. Any warmer and it won't keep. Hope this helps.

Good Luck

Dec 24, 2008 | Nor-Lake Freezer Norlake Refrigeration 6'...

1 Answer

-40 F Freezer


MINUS FORTY DEGREES IS TOO EXTREME FOR A FOOD FREEZER. IF YOU ARE GOING TO USE IT FOR SOMETHING ELSE, YOU WILL PROBABLY HAVE TO REPLACE THE CONTROL WITH SOMETHING ELSE. MOST STANDARD FREEZER CONTROLS ARE DESIGNED FOR TEMPS BETWEEN -10 AND +10 DEGREES FAHRENHEIT.

Mar 26, 2008 | Freezers

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