Question about True TWT-48 Stainless Steel Commercial Refrigerator

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True Freezer I changed a 1/2 hp Copeland compressor 404A in a True reach in freezer. My question is with a single cap tube system I'm not sure what coil temp I should be looking for. Unit calls for 12 oz but when I added 12 oz the suction pressure was very low and it never went below 40 degrees. Desired temp is 10 below. Just for reference I changed the dryer and cap tubes.

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Hopefully you were good on cap tube length is this is an important aspect of this system.The length must be matched

Posted on Jul 01, 2009

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What should the refrigerant pressures be on a reach in freezer that uses 404A refrigerant


Generally, low side is around 20-25 PSI and High side is about 235-250 when unit is close to operating temp. Expansion device effects this to some degree such as a cap tube can restrict and affect pressures as well as the amount of the charge in the system. Compressor efficiency is another.

Jan 19, 2018 | Freezers

1 Answer

Continental Freezer model F2 404A refrigerant not cooling properly. Replaced cap tube, and filter drier, evacuated, and charged. Box temp not going below 32' and ice forming at beginning of evaporator....


Check the compressor efficiency. See if it will pump down. In most cases, a good compressor will pull down to about 15" vacuum. Also, be sure that the refrigerant amount was weighed in and not done by pressures only.

May 18, 2017 | Continental Freezer Wide...

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What happens if you would add a charge to a running system that has a low charge on a 404a system and you charge thru the suction as a vapor. I had a memory lapse and have charged 410 systems as a liquid...


as long as you recovered the charge, pulled a vacuum, changed the filter/dryer, and added the correct amount of refrigerant as a liquid, you should be good to go.

Jun 28, 2017 | Hoshizaki Freezer Commercial Ice Machines...

1 Answer

Can the T-49F be converted from freezer to refrigerator?


Anything is possible so Yes... Although I wouldnt recommend it. The price to have a qualified technician do the job would reach very close to the cost of a new reach-in cooler and it could put a bit of a burden on the compressor. You are better off selling the freezer and purchasing a cooler with the money from the sale. It would involve one of two fairly large scale jobs. 1. The recovery of the refrigerant and installation of a CPR (Crankcase Pressure Regulator) with some wiring changes and adjustments... Or 2. The replacement of the compressor and capillary tubing.

Dec 26, 2010 | True 49 cu. ft. / 1388 liter Commercial...

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...

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

I got a restriction in my freezer


this happened to me once, when I brazed up the comp some flux ran down inside the pipe causing an intermittant blockage, hope this helps.

Apr 11, 2009 | Traulsen Reach in Freezer - G22010

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...

5 Answers

I have a True Freezer Model T-49. It works fine but every 3 or 4


This sounds like a stuck relay to me. I have seen this problem before. The defrost clock kills power to the compressor relay coil during defrost. If the contacts in the relay are welded together the compressor runs while unit is trying to defrost. On newer units this relay is mounted in base of unit on the side or back of the electrical box near center bottom of unit. The compressor relay is a small rectangular box with 4 wires attached. It can be replaced with a single pole 20 amp contactor with a 120 volt coil/ or 240 volt. Check the units name plate voltage rating and ratings on old relay! ;)

Mar 14, 2009 | True 49 cu. ft. / 1388 liter Commercial...

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

Nov 01, 2007 | Freezers

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