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

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Have a gdn-49 true freezer freezing in evap to compressor what could be the problems

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Low refrigerant, leak, evap fan inop, thermostat inop.

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Posted on Sep 02, 2010

  • jimmy wong Jan 09, 2011

    add a timer to set every 4 hours to deforst once and make sure condensor not dirty.

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Compressor vibrates and unit only cools to 20 degrees. tech says it "may" be compressor pressure valve ($1800.00) but no warranty. I cant find any such part listed for True T49-F commercial...


Okay first True uses capillary tube not an expansion valve.
You say the compressor vibrates not cooling ?
If the valves of the compressor are bad, he may mean
internal valves but usually pressures would not be good.
Give a little more detail please.

Apr 26, 2011 | True 49 cu. ft. / 1388 liter Commercial...

1 Answer

I have a T-49 freezer with compressor running defrost timer board is showing in refrigeration mode. I have power on the #4 terminal going to the evaporator fans. Both door switches are closed. I am not...


most freezers have 2 controls. 1 is a defrost terminator and the other is a fan delay. the delay and the defrost terminator can sometimes be a "2 in 1" type switch. you would have to study the wiring diagram. The delay will not let the fans come on untill the evap reaches a preset temperature. take another look at the diagram. It may be that the evap is not getting cold enough. you may have a refrigeration issue.

May 15, 2017 | True 49 cu. ft. / 1388 liter Commercial...

2 Answers

Our true freezer is not working at all.. No cold air going through the refrigerator.. Need repair assistance


we specialize in true freezer repair in illinois. Is compressor running or fan under unit? if not the thermostat may be bad.

Aug 06, 2009 | True 49 cu. ft. / 1388 liter Commercial...

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...

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...

2 Answers

Freezer Not Fan not running!


Most all commercial freezers have some sort of fan delay/ defrost termination device. Commonly called a "Klixon" (pronounced clicks-on). It is a device that is attached to the evap. It's function is to terminate the defrost cycle when the evap reaches a certain temp, say about 50 degrees or so, to ensure there is no build up of frost/ ice on the evap. It then allows the compressor to run, and cool the evap down to a reasonable temp., say about 20 degrees, and then let the evap fan come on. It prevents overloading the compressor during a high temp condition, and it also prevents circulating warm air left from the defrost cycle. I believe this device is most likely your problem. With no air circulating, the box will no cool down.. I have seen them burn and/or slhort internally. They can come apart. too. I would look here for that problem. the True manufacturing website does not give alot of info on this piece of equipment, such as a wiring diagram but manuals are available.
Check this out and let me know how it comes out.

May 17, 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

TRUE freezer model number GDM-49F.


Your unit should have a defrost timer.The timer may be stuck in a defrost.It should be located at the bottom of the unit next to the compressor.Open the door to the timer and observe the position of the timer.If you turn the knob and the unit starts up,it's the timer. If this is the case, you can purchase a new one at any local a/c supply.Let me know,Mike

Dec 13, 2007 | True 49 cu. ft. / 1388 liter Commercial...

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