Question about Turbo Air 49 cu. ft. / 1388 liter Commercial Freezer TSF-49SD

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Temp. can not reach 0 degree.

Our turbo air freezer has some problem, it is still working, but the temp. is alway above 0 degree, about 10 degress most of then time. It was about -10 degree before. I wounder what is the problem with it? We got some guys to fix it, but it didn't work very well, some fo them say it is because of the compresser is too old, we need to change it, some of them say it is not...do you have any idea what is going on?

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  • mopar440man May 31, 2010

    do you know what the pressures were and what type of freon is in it.

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  • Turbo Air Master
  • 1,033 Answers

Things that need checking:
refrigerant level. Super heat. Condenser clean? Compressor effeciency.
These are things that an experienced tech can check. If you have some experience and gages/ tools, I can give you some things to do but most of this requires experience.
Let me know if I can be of any further help.

Posted on Jun 05, 2010

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How lpw of a temp. Can this freezer reach..and and if only 0 degree could the thermostat temp control be changed out so it could reach les than 0 temperatures like negative 20 or so?


There are different models made for holding different products. Yours has a 1/3 hp compressor for above 20 degs. It may have 0 on the thermostat and may well pull down that far, but -20 would be out of it's reach. Where as it's sister model is made to freeze to below zero has a 3/4 hp compressor. Larger compressor for the lower temps.

Sep 18, 2011 | Beverage-Air 44.9 cu. ft. / 1271 liter...

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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

It seems that the temp more often goes up to 20-30's and that food is not as frozen when I check it. When temp goes up I check it for next couple of minutes and usually within 10 min the temp is back down...


This is normal. All commercfial freezers must defrost 3 to 5 times a day, or they will freeze over at the coil and then stop freezing. A timer in your freezer turns off the compressor and turns a heating element on for 10 to 15 minutes. During that time the coil heats and melts frost from the coil. Usually within 30 minutes the temperature will briefly rise to 20 t0 25 degrees F and then quickly drop down to 0 degrees F. The food rarely defrosts in this short period of time..

Sep 01, 2010 | Turbo Air 23 cu. ft. / 651 liter...

2 Answers

Have defrosted my 210 cu.ft. upright freezer v2003rw3, do not have my manual to hand . At what setting on the dial should I put it at to start it up?


Every Refrigerator has its own "personality" There is no common
setting for any one refrigerator. I would start with 3
The real solution is what I have always told my customers
Get a refrigerator thermometer and a freezer thermometer
Refrigerator temp should be about 33-37 degrees.
Freezer should be about 0-10 degrees. below 0 is overkill

If this was helpful please rate me.
Leo Ponder Appliance-Tyler,Texas
imufo2@sbcglobal.net

Aug 07, 2010 | Woods 201 cu. ft. Upright Freezer V2003RW3

1 Answer

Freezer temperature does not get below 10 degrees


this is something you can do now. Check this 1st:
make sure that the air vents are not blocked and that you didnt overload the freezer with food

there can be other things that will not bring the temp. below 10 (that temp. is not too bad as long as it doesnt spoil the food)
here are the possiblities:
t'stat is set too low
t'stat is not responding to zero degrees (all that means is it is shuting off the compressor too soon to reach zero)
dirty condenser
r-134a freon is a tad low (only takes like 9 oz. if lose 1 or 2 that is enough to affect performance)
the freon is the last thing to check cuase you have to call someone to do that for you...

Well hope this was helpful... check the temp often watch to see if it gets above 20 degrees cause that will spoil you food..

Mar 11, 2010 | Freezers

1 Answer

Temperature swing specification in a chest freezer.


It depends on the control that your freezer utilizes.

If your temp control dial has the numbers 0-9 or 1-9, then you have whats commonly known as a coil temp sensor.


Unlike an air temp contol that measure the air temp inside the freezer and comes on and off with a 3-5° swing, the coil temp sensor runs a little bit different.

With a coil temp control or sensor, the temp control has a capillary tube and bulb that is inserted into the coil either at on of the ends down a guidetube or just into the center of the radiator type fins. This temp control measures the temperature of the coil, and not the temperature of the air inside the freezer. When the unit runs, the coils typically gets 20° colder than the air temp. And when the control satisfies (shuts off), it will not call for cooling again until the sensing bulb has reached the cut-in point which is typically well above design box temp.


So, to quickly answer your question, yes it is possible to have a 25° temp swing and not have anything really wrong with the unit. That is how its been designed to operate and that is how it will operate. Your only option (although not recommended) is to replace the coil temp sensor with and air temp control. That will give you more consistent temps.


Also, when taking temp of a freezer with a coil temp sensor, be sure to temp the product in the freezer and not the air temperature.

Jan 01, 2010 | Frigidaire 14.8 Cu. Ft. Chest Freezer -...

1 Answer

We have a true T49F freezer and the evaporator fans are not running. The compressor is running on startup. The coils are cold. But are freezing up. Shouldn't the fan be on, or does the cabinet have to...


Freezers have a sensor that is referred to as a "Fan Delay/Defrost Terminator". It senses the temp during the defrost cycle. Usually, when the evap temp reaches about 50 degrees, there should not be any frost or ice on it. This device terminates the defrost cycle. It also keeps the fans off so warm air is not circulated. When the evap gets to about 20 degress or so, the sensor switches on the evap fans. If the fans are not coming on, either the sensor is bad or the evap is not reaching the proper temp to cause the sensor to turn on the fans.

Hope is helps to clear up some things and point you in a direction as to what might be going on.

Jul 12, 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

Proper temp. range in freezer


Hi dgh1,
The freezer should stay within 5 degrees of 0 while in operation. While in defrost the freezer may reach as high as 20 to 25 degrees. If any higher temperatures are reached your food will spoil as they are defrosted and refroze everyday. If you find that the temperature is allowing your food to defrost you may want to replace your defrost thermostat. This device is located on top of the evaperator coil inside the back of the freezer. It is made to turn the heater off when a temperature of 55 degrees is reached. One other possible problem could be your defrost timer is taking to long to restart the cooling cycle after defrosting. I hope this will help you and please send any other questions you may have, I am happy to help. and dont forget to rate me.
Mike Anderson
Anderson Appliance
(865)945-3808

Oct 28, 2008 | Kenmore Freezer 20.3 cu. ft. Frost Free...

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