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I have 134a traulsen commercial freezer with txv. My suction pressure is 3psi and my head is 150 psi. Ambient is 78degrees and my box temp is 9degrees. Is 3psi suction too low for 9degree box temp

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  • Traulsen Master
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No, it is not. With that ambient the suction pressure should hover around 0 psi.

Posted on Apr 19, 2015

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1 Answer

What is the operating pressure of a g22010


depends on refrigerant being used, the ambient it is working in, the desired box temp as a general rule. gotta have more info.

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Head pressure 250 suction 30 R-404 box temp will not drop below +10 NEW COND. UNIT & TXV OEM


http://www.arkema-inc.com/pdf/fluorochem/Forane404a_pres_temp.pdf

What is the
"Superheat" on the suction line 6" from compressor ?
Did you change the drier and evacuate to at least 500 microns ?
What model number is the condensing unit ?
Does the system have a "Crankcase Pressure Regulator"
if so is the TXV ZP type ?

Feb 28, 2011 | Freezers

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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...

1 Answer

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.

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1 Answer

What could cause an evaporator coil to freeze up on a true t-19f. Also what is the suction pressure on this model.


Hello
Could be low on freon,i belive this model uses 134A.

So the suction pressure should be 31 to 35 psig,for a temp of 36 to 40.f

Also check the defrost timer and the door seal. The eveap should have a drain line on it, make sure this is working and not plugged.

Apr 07, 2010 | True 19 cu. ft. / 538 liter Commercial...

1 Answer

I replaced compressor for a hussman refrig and its hums loud


God day,
Some thoughts.
1. Are the evap fan motors running, and at full speed. That would give you abnormally low suction pressure.
2. Cap tube sized too small. or partial restriction in the dryer cap tube/dryer when brazing in the lines.
3. Low ambient. What's the temp the machine is running in.
4. Over sized compressor.
5. Moisture. God, 134A is touchy on that one.
6. Was original cap tube soldered to the suction line to create a heat exchanger. Needed on many apps. Definately would cause flash back on start up.
7. Superheat a little low, should be 12 to 15 degrees.

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3 Answers

Normal Operating pressure for true 2 door Freezer R404A Room Under 80 degrees F Box at -10 degrees F


The pressures depend, somewhat, on the expansion device,i.e. a TXV or Cap Tube. Take a pressure reading, then convert it to a temperature. The evap temp should be right at 10 colder than the box temp. Remember, heat flows to cold so the evap has to "Lead the Load" in order to cool. In many cases, the condensing pressure is usually ambient temp, plus 30, then convert to a pressure. These are general accepted practices that have been used for many years.

Hope this helps

Jul 11, 2009 | True 49 cu. ft. / 1388 liter Commercial...

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...

3 Answers

Traulsen Commercial Freezer needs charging?


The refrigerant level is low. The only thing is that the unit may not have a low charge. There can be several things that cause the unit not to refrigerate properly. It could have weak valves in the compressor or even a bad TXV(thermostatic expansion valve). Have you had this box repaired yet.? I see that this is an old post.

Dec 09, 2008 | Traulsen 24.2 cu. ft. / 685 liter...

2 Answers

Low suction pressure high head pressure


That system has a restriction. Most common at TXV valve or capillary tube. Will need to be replaced by Refrigeration company. In this video I replaced TXV valve and filter drier due to the same issue You have. Its Ice Machine, Low side was at 5 PSI, High at 250PSI : 404A; should be around 55-65 Low; 250 -275 High. Replaced drier and TXV, machine works proper.

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