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Delay on evap. fan sistm.404a

Every time em the compressor star make noise for about 5second , than work normaly but the evap. fan won`t start

Posted by edilson cruz on

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fridgeguy

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Im working on a true freezer myself... I have everything working , including the evaporator fans, but I cant seem to figure out why the evap coil wont frost up.... jumpered the defrost termination switch and evap fans kicked on but still no cool on evap coil.... any idea\'s?????

Posted on Jun 01, 2013

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mike cooper

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Give the evaporator a chance to get cold, then check you've got power to the fan, via the evaporator thermistor and door switch

Posted on May 04, 2012

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Dennis Boxerman

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SOURCE: evap fans not turning on

If this is a commercial unit, you're too low on refrigerant (freon). Freezer should be about a minus 10 degrees for the evap and high side is ambient converted to a psi for the type of refrigerant that is in the system plus 25-30 psi.
The evap fans will not come on because the evap is not cold enough.
Hope this helps and good luck.

Posted on Apr 10, 2009

harley

  • 6 Answers

SOURCE: true gdm12 evap fan runs all the time evev with

evap fans will run continuiously on this unit,it is normal. fans stay on to circuilate air evenly inside unit.

Posted on Oct 23, 2011

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1 Answer

I have a masterbuilt commerical display freezer. I had it off for a while. Does it have a reset button to turn the fans back on?


with out a model and serial number to go on, I can tell you that most all of their units have what is called a "Fan Delay" located in the evaporator coil. It keeps the fan off on the evap. to prevent them from circulating warm air and overloading the compressor. In most cases, when the evap. reaches about 20 to 26 degrees, the delay will bring the fans on and will start cooling the conditioned space.
Hope this helps.

Jan 20, 2011 | Freezers

1 Answer

No evaperater fan run,compressor running,coil is frosting but no voltage to inside fan.


Look to the fan delay/defrost terminator that is located inside to the evap. It is usually attached to the evap coil. check there first.

Aug 25, 2010 | True 206 cu. ft. Freezer TWT-67F

1 Answer

Compressor runs but internal fan isn't working, switch appears good what do I need to check regarding the fan?


Check to see if there is correct,complete power to the fan. If not, look for a fan delay that may be attached to the evap. It comes in many configurations. It may have two or three wires going to it. They may be two black wire or 3 wire of different colors. Power goes to the fan thru this device. It may not be working or the evap not getting cold enough to activate it. I will need model and serial to help more.
Let me know what you find.

Jun 01, 2010 | Traulsen 24.2 cu. ft. / 685 liter...

1 Answer

Fans not running, everthing else runs. True model T-72F reach in


In most cases, there is a device located in or on the evap that senses the temp of the evap. This can be a defrost terminator/fan delay. Sometimes they are separate devices and sometimes they are a 2 in 1 device. If the evap does not get cold enough, the fans will not come on. Usually about +20 degree F. It is to prevent circulating warm air after a defrost and to keep from overloading the compressor after a defrost as heat is generated by electric elements. I would look to see if the defrost terminator / fan delay has malfunctioned, then I would check the refrigeration system performance.

Apr 23, 2010 | True 72 cu. ft. / 2039 liter Commercial...

3 Answers

Fan in freezer not working


It runs when the compressor runs except when it's in the defrost cycle. If you have an electronic control instead of a defrost timer the control could be the problem since it runs the fans. You can test the evaporator fan. See how here> How to check everything
http://www.acmehowto.com/howto/appliance/refrigerator/refrigerator.php

Sep 21, 2009 | Arctic Air 22 cu. ft. Commercial Freezer...

1 Answer

I have a True Freezer, the compressor comes on but the fans inside the box do not so there is no cold. I replaced both capacitors but still no luck.


http://www.truemfg.com/pdf/InstallManuals/T-SERIES/t_series_english.pdf
Go to this web site and look in the manual on page 15. Check "Compressor runs but will not refrigerate". Gives some suggestions.
Now, inside the evap, usually strapped or clipped to the coil "U" turn on the end of the coil, is a Klixon device. This device comes in many different configurations. There may be 1 or 2 of these. One is a defrost termination switch. When evap gets hot enough so no frost is present, it terminates the defrost cycle. The other is a fan delay. It comes on when the coil temp gets to about 20 degrees. This prevents circulating warm air from defrost cycle. Now if there is only one device, it can be 2 in 1. That is, a defrost terminator/ fan delay. Will most likely have 3 wires going to it where as the 2 separate ones will only have 2 wires to each one. Now, either this fan delay is not working correctly or the coil is not getting cold enough. When it gets cold enough, it turns on the evap fans. This is most likely where your problem lays. Check it out.

Sep 08, 2009 | True 52 cu. ft. / 1472 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...

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

Unit not freezing , evaporator fan wont run


If this is a Bev-Air, don't think the door switch will control the fan. At the evap, there is a temp sensor called a fan delay. When unit goes into defrost mode, this warms up. Some also serve a dual purpose. It will terminate the defrost cycle at a certain temp., say 51 degrees or so, at the evap. Anyway, when unit comes out of defrost, it keeps the fan off so it allows the evap to cool quicker and to prevent circulating warm air. This could be your problem. Not a hard fix but they can be a pain sometimes. Outside chance that the unit is low on refrigerant (freon). This will not let the evap get cold enough to trip the sensor back into position to turn the fan on. Good Luck. Restaurant Parts and More carry alot of Bev-Air stuff. 1-888-814-1110. Ask for Rick

Oct 09, 2008 | Beverage-Air 23.1 cu. ft. / 654 liter...

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