Question about Traulsen G20010 Commercial Refrigerator

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Frecuent iced over evaporator - Traulsen G20010 Commercial Refrigerator

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Good day,
If we're talking about a 35 degree box,
It's normal for the coil to run down to 17 to 18 degrees, followed by shutting down until the coil temp. reaches approx. 38 degrees, which is above freezing and allows for enough time for the coil to defrost.

Your box controls this hi/low range either with a cycle defrost thermostat not unlike a thermostat in a domestic refrigerator.
Or, it is performed by a low pressure switch which accomplishes the same thing by being adjusted to cut in and out at the pressures of the refrigerant that correspond to the correct temperatures.

Either one can be set wrong, or not performing properly. Adjust
or replace as necessary. However,

It is not unusual for a commercial box to do this even if the controls are O.K.
In that case, it is accepted practice, to add an interruption timer.

Normally, this timer is set to shut the compressor off for a period of time, whether it wants to or not. Thus guaranteeing defrosting.

A good timing event to start with is 3 times a day, ( every 8 hours)
for a period of 30 minutes. Adjust as needed.
All commercial refrigeration supply houses carry them in 120 and 240 volt versions.

Posted on Nov 12, 2009

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You have an air leak somewhere. Either inthe area where the pipes enter the unit, or you have a bad doorseal. Either will allow air to continually get into the unit, keeping the moisture level high. Seal the leak and you will end the problem.

Posted on Nov 12, 2009

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1 Answer

Max harvest retrying


Likely cause,
1. Ice bridge thickness too small, not enough ice to open curtain.
Solution, Check and adjust if needed.
2.Ice bridge thickness too large, ice frozen to evaporator frame.
Solution, Check and adjust if needed.
3. Purge valve dose not open, water melts ice bridge, not enough ice to open curtain.
Solution, Check purge valve.
4. Incomplete ice formation.
Solution, check water distribution for partially plugged holes.
5. Curtain out of position.
Solution, check curtain for swing restriction.
6. Curtain switch dose not open when curtain does.
Solution, Check switch with ohmmeter.
7. Machine in very cold ambient area.
Solution, Move machine to warmer location.
8. Hot gas valve dose not open.
Solution, Check hot gas valve, check controller using test mode.
9. Harvest assist probe out of position - ejector pin not retracted.
Solution, check harvest assist mechanism-spring should retract pin.
10. Damaged evaporator.
Solution, Check evaporator surface now would be a good time to make sure evaporator plate is not dirty this will cause ice to hang up on evaporator plate also check plate to make sure all cross points are not loose.
11. Fan motor stays on during harvest.
Solution, check controller using test mode.

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2 Answers

Deli case icing up at evaporator inlet


Most deli units are gravity cooling units and it is normal for the evaporator to be iced up if your unit has fans it still is not unusual, the ice will melt when the unit cycles off. If the evaporator is only iced up on one end, you are low on freon.

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1 Answer

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The most common causes of evaporator freezing are:

dirty or obstruccted evaporator coil,
evaporator fan not working or working too slow.
and the most frecuent is LOW on R-22 Refrigerant. Check lines, look for wet looking spots and greasy/oily stuff on the lines.

Good luck!! Rate this post!!

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If the evaporator tube is iced up entering the coil and cool to warm leaving the evaporator, that would indicate low on refrigerant or a restriction. If it is iced up entering and leaving the evaporator, then, it could be low on refrigerant,blower not running at proper speed, dirty evaporator coil or filter.
You need to check the suction and head pressure and temperature to determine problem for sure.

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1 Answer

Unusual noise and ice all over the freezer


This sounds like the fan is hitting the ice. If it's iced up, remove the food from the freezer and place in refrigerator.

Take the bottom panel out of the inside of the freezer section and then remove the back panel from inside the freezer section. You will then be able to see the evaporator fan. You will need to check to see if the evaporator fan will turn with the power of the refrigerator turned on.

You also want to look to see if the evaporator fan is turning and hitting ice which means the evaporator is froze up. You will need to check and see if the evaporator fan is bad or the defrost timer is bad.


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2 Answers

Refergerator side back panel freezing up with ice


2 posibles problems. if the ice is only about 4 an 8 inches you have a seal system problem.(evaporator freon leak) need replace the evaporator asap. if the ice cove a big part of the back wall you have a thermostat problem. for replace the evaporator better call a tech. remember to call a subzero factory authorized company. maybe still under some warrantty> good luck LEAVE YOUR COMMENT IF IT WAS GOOD FOR YOU....... THANKS

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1 Answer

Ice forming on freezer


The drain is plugged. This fridge will defrost every 8 hrs or so. When it does , it will melt the frost that has built up on the evaporator. This melted frost will run down a drain under the evaporator to a drain in the bottom directly under the evaporator. When the drain gets plugged the water cannot drain out of the freezer compartment. After several defrost cycles the melted frost will overflow onto the freezer floor. When the fridge starts back up it will freez this water is the bottom of the fridge. sometimes this water that is now ice will melt on the next defrost cycle and actually run out into the floor. You will have to unplug the fridge or turn it off, then remove the cover to the evaporator. Get a hair dryer and melt the ice aruond the evaporator and drain. Once the ice is removed, check the drain and try to clear it. Once clear, replace everything but the shelves. Plug the fridge back in or turn it back on. Observe and listen for the evaporator fan. It should be running now. When working on the ice on the evaporator always be carefull. The defrost heater can be damaged if up push or pull on it too much.

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