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I would like the normal operateing pressures in a 70* space with a box temp of 10* this is a 404a unit

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Temp display reads 92 (hi temp) but the interior temp is 0.


No. Sounds like the intern temp sensor is bad, missing, or not connected. 92 is probably the max reading it can display. The unit will probably operate continuously, be much to cold, and cost a ton to operate. I assume you bought this from Sears. Call them to replace the freezer. Should be no problem.

Oct 24, 2012 | Kenmore 20.6 cu. ft. Upright Freezer 2809

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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.

Aug 11, 2012 | Traulsen Reach in Freezer - G22010

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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

1 Answer

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.

Sep 27, 2010 | Continental Manufacturing Company...

1 Answer

Frigidaire freezer LFFH21F7HWG. the temp gauge outside registers only 0. I have 3 thermometers inside all register 18 degrees. ice cream is soft in the box. machine was delivered last Tuesday. the freezer...


these freezer are designed to run about 70 percent of the time the temp displayed can vary by +/- 3 degrees..make sure you have fan operation in the freezer and the air flow is not blocked or restricted. also make sure that the door is sealing properly

Aug 31, 2010 | Frigidaire 20.6 cu. ft. / 583 liter...

1 Answer

Freezer thermostat was set at 0 degrees unit went down to -30 degrees. I increased temp on thermostat 3 degrees 3 times each over a 3 day period. The thermostat is not responding. I have the thermostat set...


I would start there. If the thermostat has an off setting, turn it there and see if it goes off. If not, try turning it to it's warmest setting while the box is cold to see if it turns off. To test to see if the relay/ contactor is stuck/bad, kill power to the unit (Unplug or turn off breaker). Disconnect one wire to the thermostat. Restore power. If unit runs, bad relay/contactor. If unit does not run, I'd replace the thermostat. Make sure the sensing bulb of the thermostat is in the conditioned space of the box or in the return air (intake) side of the evap so it can sense the box temp.

Aug 02, 2010 | Nor-Lake KLF7766C Commercial Freezer

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...

1 Answer

UP RIGHT FRIGIDAIRE FREEZER AUTO DEFROST 11CF I THINK


This could be normal for the summer. This is the right temp to keep it at. Some units are meant to run 80 - 90 % of the time. Turn it all the way up and check the temp. Most units when working properly can get below 0. Check the condensor underneath for dirt and to see if the fan is running under there. (smaller units don't have anything underneath) Some have coils in the rear and the smallest units just use the sides of the cabinet to disperse the heat. Check the gasket see if its sealing properly or maybe the door is warped and not closing at the bottom.

Jun 28, 2008 | Frigidaire 11.6 cu. ft. / 328 liter...

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