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

2 Answers

Freezer is short cycling ,thermostat was replaced with small cycle change (2 mins off 3 min on) thermometer inside barely moves 2 degrees lower on kick on. thermostat rated with 11 degree diff. freezer full or empty has little effect on cycle. moved thermostat tube all over with little effect. I also have another ss door 49cu ft true the temp swing according to thermostat is 12 degrees with 10 min cycles I know to expect less time cyc with glass doors but little or no inside temp swing and short cycles doesn't seem right.

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  • bloodshed Aug 14, 2011

    That doesn't tell me a thing. i knew it was something other than the thermostat I told you that 2 of them acted the same. give me some ideas on what system problems it could be.
    Dave

  • bloodshed Aug 15, 2011

    you didn't say seales system problem ,you system problem . read what you wrote.

  • bloodshed Aug 15, 2011

    Freezer is short cycling ,thermostat
    Problem with the True 49 cu. ft. / 1388 liter Commercial Freezer GDM-49F-RC
    freezer is short cycling ,thermostat was replaced with small cycle change (2 mins off 3 min on) thermometer inside barely moves 2 degrees lower on kick on. thermostat rated with 11 degree diff. freezer full or empty has little effect on cycle. moved thermostat tube all over with little effect. I also have another ss door 49cu ft true the temp swing according to thermostat is 12 degrees with 10 min cycles I know to expect less time cyc with glass doors but little or no inside temp swing and short cycles doesn't seem right. View Comments

  • bloodshed Aug 15, 2011

    I can not find any thing on a Seales system on a true freezer? what is it?

  • bloodshed Aug 15, 2011

    we just purchased this unit about a month ago and it has been short cycling since installed.
    The deal was that a commercial appl repair company check the unit out before i bought it (it was used) the appl repair gave it a ok so we bought it.I called them right away after install and told them it was short cycling. they sent a kid out who said it had to be the thermostat and relaced it.
    It did help a little going from 45 sec cycle to 2 mins but like i said the temp inside the unit only drops 2 maybe 3 degrees before restart. the unit is in our store front and creates so much heat the air conditioner seldom shuts down. our elec bill went up $200.00 last month alone. granted it was hot here last month but thought that was a little high. Now I'm stuck between the seller who said he'd pay for the new thermostat and the repair place who's sent 2 bills to us twice for the thermostat. Shouldn't the repair guy caught this on first inspection? And I still don't have a freezer that works right.
    Dave B

  • bloodshed Aug 19, 2011

    the owner of the refrigeration place that checked unit before i bought it came yesterday and put a wr thermostat from a walk in freezer on it. It now seems to work properly at least theres a temp swing of 12 degrees now and 6 to 8 min cycles still seems wierd that the other two thermostats out of the box listed with a 11 degee dif short cycled. thanks for your help.
    Dave

  • bloodshed Aug 19, 2011

    seems it was the thermostat dealer replaced with a ajustable dif wr seems to be working

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To me it sounds like, from what I am reading that your compressor may be the root cause if it is short cycling and you changed the thermostat and moved the thermocouple and the problem persists. Was this working fine till recently or did you just aquire the freezer and noticed it is not performing correctly?
Here's the simple procedure I use whenever I run into one that's 'short-cycling' (trying to start, clicking on/off every few seconds, or in some cases, every minute or two).

Basically, using a digital ohmmeter, you pull the compressor's relay and overload off its three terminals, then check the resistance between each of these three pins. Older relays looked a bit different than the solid state ones, but pull off pretty much the same way.

First note the two pins that read the highest resistance. The one that remains is the 'common', to which one end of both the start and main windings connect. (The common's not always the top pin, so you'll want to do this test to be sure)
Reading from that common to each of the other two, carefully note each reading. Then measure back across the two with the highest resistance, ignoring the common. That reading should be the exact total of the two individual coil readings, because you're reading through both coils in series now.

If those two sets of readings aren't within about 1/2 ohm of each other, then one of the compressor windings is shorted, and if it runs at all, it'll run hot and usually end up short-cycling on its overload protector. If the windings test OK, but it still won't run, then I connect a test cord and try to run it manually. If I can't start it that way, it's most likely a mechanical problem, most often binding bearings, and the 'bottom line's the same: either the compressor or freezer will have to be replaced.freezer is short cycling ,thermostat - dcramer531_131.jpgdcramer531_132.jpg

Did the new thermostat come with an adjustment screw in the back? if so you might want to play with that as that can also cause this issue if it is not set correctly.

Posted on Aug 15, 2011

  • 1 more comment 
  • Dcramer531
    Dcramer531 Aug 15, 2011

    Let me know what you find and as far as the glass door model what your describing is about how it should work on these commercial freezers so I don't suspect an issue just check for any air leaks and make sure the doors are sealing correctly.
    Thanks.
    Dave

  • Dcramer531
    Dcramer531 Aug 15, 2011

    My own personal opinion is that any repair bill be sent to the seller since he was the one who claimed to have it checked out and said it was good to buy. You should try and see if he will take it back if not wanting to pay for the repair. It still could be the thermostat since I can't get my hands on it and see. Have you tried lowering the temp so that the unit must stay on to see if the compressor stays running? If it is short cycling and you know it can't possibly be at the set temp then that makes me lean towards the compressor or the overload built in to the compressor. The commercial repair people should be able to provide the correct thermostat but I am wondering if they did. . Was it an excact replacement of the old one? The type of thermostats that run on pressure differences are more accurate and work better on this type of freezer, not sure what you have on yours. I will past a pic of the one listed and you can see if it is the same as yours. this kind is electrical and you can jumper the leads to get the compressor to run. If it stays running when the thermostat is unhooked then it will be a thermostat issue if it is still short cycling then the compressor would be the suspect. Does it look like this one? this one runs around $40.00 new. These units may be commercial but they are not so complicated a regular appliance person can't look at them and make a repair, might be worth the money to have someone else check it out. Somone who has a meter and can check out the compressor and thermostst and defrost heater to make sure it is all working. Will the seller pay for another person to look at it and deem it worthy? Let me know what happens if you jump the thermostat to keep the compressor running.

    Dave

  • Dcramer531
    Dcramer531 Aug 19, 2011

    Your more than welcome as I can see this was very frustrating for you and I am glad it is working at least much better than it was.

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  • Master
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You have a system problem, not a thermostat issue.This is a typical occurrence with these units as they use a capillary tube metering device not a Thermal Expansion Valve.

Posted on Aug 14, 2011

  • 4 more comments 
  • Robert Moller
    Robert Moller Aug 14, 2011

    Read what I said "You have a Seales System Problem"

  • Robert Moller
    Robert Moller Aug 14, 2011

    Capillary is most likely restricted.

  • Robert Moller
    Robert Moller Aug 15, 2011

    Typing error. SEALED SYSTEM

  • Robert Moller
    Robert Moller Aug 15, 2011

    Excuse the miss spelling. System Problem is SEALED SYSTEM PROBLEM.
    That short of a cycle has nothing to do with the thermostat's setting and differential.

  • Robert Moller
    Robert Moller Aug 16, 2011

    Read thihttp://www.supco.com/images/pdfs/Manuals-Instructions/Cap%20Tubing%20Manual.pdfs :

  • Robert Moller
    Robert Moller Aug 20, 2011

    All thermostats have an adjustable differential.

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