Question about Traulsen 7 cu. ft. / 198 liter Commercial Freezer ULT27

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Traulsen freezer URS48DT

My freezer keeps overfreezing.  To work at all, I have to defrost the freezer - then it works for about two weeks, then freezes over and doesn't work anymore.  I'm de-frosting again tonight.  What is wrong?  The refrigerator works just fine.

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Re: Traulsen freezer URS48DT

Turn cold control to Max. This keeps your compressor running for this troubleshooting exercise. Find and manually advance the defrost timer with a screwdriver or something similar. This will shut the compressor down and bring the defrost heater on. If this happens then you will know that your timer is bad.

If it is not that, the next thing to look at is the defrost heater itself or the thermal overload on your defrost heater. This keeps your defroster from overheating.

Posted on Jan 24, 2008

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Traulsen freezer with intella true continuously frosting the evaporator coil and blocking the air flow?

Your defrost circuit ... should (about twice each day) gently warm up.. and remove the frost to an evaporation tray at the bottom of your FREEZER (refrigerator?)...

Regardless of the design...

THERE are only two reasons for excessive FROST.

- massive air intrusion (check seals & gaskets)
- defective defrost circuit (check defrost timer/controller)...

EZ trouble to fix...

Post comment reply: 7/3/2016...

In general... there are only three elements to the defrost circuit:
- 1st failure is usually the "timer" (in your case (other cases it is being replaced by the power control board (do remove power: line voltages present).
- 2nd failure (inside ... usually atop the evaporator) is the "DEFROST THERMOSTAT" (designed the keep the heating element from getting much hotter than 55 degrees Fahrenheit, ("failing" = open.. prevents the heater element from being energized at all).
- 3rd the heating element... itself goes open (usually below the evaporator (caution: line voltages on 2nd & 3rd)).

Anytime you don't feel you've got this surrounded just comment me back... I'll be around.

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Jul 02, 2016 | Traulsen Freezers

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My service man replaced the defrost cycle timer and the relay (timer was definitely broken, relay was highly suspect) but the freezer fan still has no power so freezer will not chill adequately despite...

Most all commercial freezers have a fan delay/ defrost terminator. It is usually mounted on the end of the evap coil. It's purpose is to sense the temp of the coil during the defrost cycle. When it hits a preset temp., usually around 55 degrees or more (depends on Mfg.) It terminates the defrost cycle. It also doubles as a fan delay. It allows the evap coil to cool off from the defrost cycle before allowing the fan to come on. Usually, the coil has to get around 20 degrees before fan will energize. I would look for this as a possible problem. It could be one device with 3 wires or 2 separate devices with 2 wires each. I've seen it both ways.
Hope this helps.

Nov 19, 2009 | Traulsen 46 cu. ft. Commercial Freezer...

1 Answer

Hi,i would like to know how to set the traulsen intela-tarul digital thermostat and how to put it in defrost mode

How to check everything

If the evaporator coils behind the back panel of the freezer are icing up because of auto defrost failure that will stop the circulation of cold air and eventually affect the freezer too.

check defrost timer, defrost heater, defrost thermostat.
You can turn the defrost timer till it clicks and everything shuts down. The heater should now come on. If it does, replace the timer. If it doesn't, check the heater and defrost thermostat. Turn the timer again till everything starts back up to end the defrost cycle.

Part 257 on this diagram is your defrost timer

Aug 19, 2009 | Traulsen 24.2 cu. ft. / 685 liter...

1 Answer

Traulsen ur 48 dt freezer want go below 10 deg

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

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Traulsen URS36DT:

checking a def system is kind of easy. if you have located the defrost timer just turn the little knob on the timer until the unit shuts off, shortly you should hear "hissing and pooping" from water dropping on the heater. this lets you know that the defrost thermostat is good. if you dont hear this noise check your def thermostat and heater for continuity. if you put it into def and the heater comes on then you have a bad timer..

Dec 11, 2007 | Traulsen 7 cu. ft. / 198 liter Commercial...

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Traulsen freezer urns for about 2 weeks then stops getting cold enough

Will it restart again? How old is this freezer? Could be start relay loose or a burned wire connection, worn out compressor. Let us Know what you find

Oct 12, 2007 | Traulsen 7 cu. ft. / 198 liter Commercial...

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