Question about True 49 cu. ft. / 1388 liter Commercial Freezer GDM-49F-RC

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Normal operating pressures for 404 reach in freezer

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Posted on Jan 02, 2017

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SOURCE: evaporator unit keeps on building ice. question

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.

Posted on Apr 08, 2009

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1 Answer

Commercial freezer 404 system what is the correct vaporat ing temp or psig


If you are asking about the pressures that are on the compressor, you need to be aware of the temp of the room that it is in and you need a manifold guage set.

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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 ?

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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...

2 Answers

Working on a t49 freezer it wont go below 30 , change compressor couple months a go worked fine. Now i change dry and regas with 22oz 404 and wont go down , my high side is 200 my low side is 18 . clean...


Sounds like a restriction to me.
Recover the charge.
Pressurize the system with 350 pounds of nitrogen pressure through the high side.
Leave it pressurized for 15 minutes.
Release the pressure through the low side.
Replace the filter drier again.
Pull a 2 hour vacuum on high and low side.
Recharge liquid refrigerant on the high side.
Let the system sit idle for 30 minutes before starting.
Check the evaporator fan motor as well as the coils. Use a good coil cleaner on the e-coil.

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1 Answer

Need run pressures


You have to give more info. What refrigerant, where is the unit located so ambient temps can be considered, is there a cap tube or txv.
http://www.delfield.com/docs/uploaded/del/manuals/DM6000XL.pdf
Try this web site from Delfield. It should be you manual. It says your unit has 404-A. Check it out and let me know if you need more info.

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1 Answer

I have a ice maker that keep freezing up. the pressures are 50/280 its a 404a system. what are the normal pressures


For a 404 system pressures should be about 60/350 Remember when you recharged always with the freon drum upsidedown so liquid gas is going in to the system.But if it's freezing up could be the thermostat or the timer or the heaters.

Aug 13, 2009 | True 49 cu. ft. / 1388 liter Commercial...

1 Answer

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The first place to look is to check the charge. Using guages check the low and high side pressures and their relationship to one another. I'm assuming your unit is a R-404 unit which, if fully charged and the condenser is clean, and the fan is operating, should have about 210 to 250 high side pressure. Other things to check: evaporator coil ice/frost free; defrosting properly to obtain a clean coil; all evaporator fans running. If low side pressure is above 30 PSI you have a weak compressor. Whatever, fix the Traulsen unit, its head and shoulders above anything else on the market today.

Nov 23, 2008 | Freezers

1 Answer

Normal operating pressures


Normal operating pressures will change as the freezer reaches the selected temperatures on the inside. Normals of minus 14 degrees on the inside would be around minus 4 psi on the suction and 150 pis on discharge. Now checking the pressure will require a set of guages that have been purged with the same freon before connecting with the suction line on freezer. If not purged the suction line will draw outside air into the system and cause freezing of air and moisture inside the capillary tube rendering the freezer inoperative, Hope this helps, Sea Breeze

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