Results 1 to 12 of 12
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21-04-2010, 02:38 PM #1
coldroom too much ice on evaporator
hi everyone!r404 coldroom has ice build up every 10 days.during winter it was working fine and now there is a big problem.working temperature of coldroom is between 0-2 celsius.thans in advance!
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21-04-2010, 02:48 PM #2
Re: coldroom too much ice on evaporator
Hi :
- u probably dont have a DEFROST SEQUENCE u should add one.(compressor standby)
- are your pressures okay??
- is your txv set ok?
- do u have head pressure control?
- does compressor cycle off when door is open?
- if this is the first year u have a problem ,and u charged the unit durring the winter,u might be low on refregerant.
- good luck
THE DEFINITION OF A SMART PERSON IS ONE WHOM LEARNS FROM HIS MISTAKES!!!
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21-04-2010, 02:55 PM #3
Re: coldroom too much ice on evaporator
dear friend yes its the first year the system works it has defrost system with heaters and it works everu 8 hours for 10 minutes.working presure for r404? i think i need charging but the sight glass fills completely when its working...thanks in advance!
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21-04-2010, 07:04 PM #4
Re: coldroom too much ice on evaporator
THE DEFINITION OF A SMART PERSON IS ONE WHOM LEARNS FROM HIS MISTAKES!!!
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22-04-2010, 09:31 AM #5
Re: coldroom too much ice on evaporator
Check the evaporating temperature. Does the defrost is completed? Does the doors remain very time long open? Does the infiltration air is exterior from the exterior of the building? In the summer there is more water vapour content on the air (higher absolut humidity). Maybe you need an air curtain or something like that.
RegardsTo make progress is never good enough, I want to do better and better and better
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22-04-2010, 03:24 PM #6
Re: coldroom too much ice on evaporator
I agree with Sandro, humidity is going to be much lower in the winter.
Obviously check for any air gaps on doors, etc..
Also, i've always been told to have 4 defrosts a day, every 6 hours.
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01-05-2010, 10:23 PM #7
Re: coldroom too much ice on evaporator
hey.did u check the door seals are not cracked,the right size for the door,does the door shut ok
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07-05-2010, 09:14 AM #8
Re: coldroom too much ice on evaporator
In addition check fin spacing of evaporator may be small distance beetwin fins.
Also, i've always been told to have 4 defrosts a day, every 6 hours.In some places will have to think ...
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08-05-2010, 11:01 PM #9
Re: coldroom too much ice on evaporator
I am a facilities manager for OSI Restaurants and most our refrigeration operates off of R-404. I had a walk in freezer do the same thing. Make sure the condensor fans on the roof are operating correctly
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08-05-2010, 11:04 PM #10
Re: coldroom too much ice on evaporator
sorry misread your thread. Thought you were having ice build up on the evaporator. But ya sounds like an insulating problem to me
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12-05-2010, 10:53 AM #11
Re: coldroom too much ice on evaporator
Stathis,
How much time do you have the defrost time for each cycle? Does the defrost is totally completed after the end of the evaporator?
Also if you have the evaporators next to the acess door (mounted on that wall) that wouldn't help to prevent ice formation on the fin coils of the evaporator.To make progress is never good enough, I want to do better and better and better
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12-05-2010, 02:44 PM #12
Re: coldroom too much ice on evaporator
1) Shortage of refregerant
2) Txv not adjusted
3) Heater not working
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