Results 1 to 22 of 22
-
21-06-2008, 10:41 AM #1
defrosting of freezer system [-40°]
with water cooled condenser freezer cooling coil defrostining system with hot gas by pass is not performing properly? whay to do? - shaukat
-
-
-
21-06-2008, 12:20 PM #4
Re: defrosting of freezer system [-40°]
Condenser discharge water will be best for defrosting as it is simle and only care to be taken care in Piping the drain as well as defrost header.Check in Roy J Dossat Book the slope is clearly given
-
21-06-2008, 12:24 PM #5
Re: defrosting of freezer system [-40°]
The condenser is not a part of HG defrost so its not relevant if its cooled by water or air. If your evaporator is flooded one, allow time between LSV closed and HG valve opening to empty all the liquid out. Check the operating of KVL, some of them have strainers on the enterance and if blocked or even partialy, you don't get good suction.
Is this a sudden problem, or it has been for a long time?
-
21-06-2008, 03:15 PM #6
Re: defrosting of freezer system [-40°]
tanx, during the defrosting ,water pump is 'off' condition ,
-
22-06-2008, 10:49 AM #7
-
22-06-2008, 10:49 AM #8
-
22-06-2008, 12:49 PM #9
Re: defrosting of freezer system [-40°]
We have been using HGDF system with water cooled condensers without any problems. What exactly is the problem? U r not getting enough Hot gas? R Connections OK?
-
-
Re: defrosting of freezer system [-40°]
Maybe you should tell us a little more of what is happening.
You are saying the water pump is in the off position during defrost. this makes me believe there is not a PM valve on the high pressure line
what refrigerant are you using?
are there a manometer on the evaporator, what pressure do you get on the evap during defrost?
what is the HP of the compressor?-Cheers-
Tycho
-
22-06-2008, 04:29 PM #12
-
22-06-2008, 04:32 PM #13
-
-
26-06-2008, 01:55 PM #15
-
26-06-2008, 02:00 PM #16
Re: defrosting of freezer system [-40°]
dear frindes, i solved my problem with electric heater, a old man tehnician advice me to not use over size water cooled condenser if you are going for hot gas defrost. .. thanx again
-
26-06-2008, 02:30 PM #17
Re: defrosting of freezer system [-40°]
Originally Posted by Shaukat
They won't!
What you have is a fundamental problem with the hot gas defrost system. Are you defrosting more than one evaporator at a time? Or worse, do you only have one evaporator on the compressor?If all else fails, ask for help.
-
Re: defrosting of freezer system [-40°]
If the condenser is oversized, and there is a PM valve on the hp line, and the hotgas is connected on the condenser side of the PM
Or if the condenser is correctly sized and there is no PM valve, and the compressor is on low capacity (if there is capacity control on the compressor), compressor on low capacity - little to no hotgas - not enough hp to overcome the hotgas return valve (if it's set to high)
there's not enough info to make anything close to an educated guess-Cheers-
Tycho
-
26-06-2008, 09:30 PM #19
Re: defrosting of freezer system [-40°]
I don't disagree with you Tycho, but to say a water-cooled condenser is the reason is not correct either.
Something else is wrong.If all else fails, ask for help.
-
-
26-06-2008, 10:31 PM #21
Re: defrosting of freezer system [-40°]
That's fine, I'm a big boy.
There is definitely a system design problem though. Sure an over-sized condenser would make the problem worse instead of better.
I'm going back to my corner now....If all else fails, ask for help.
-
06-07-2008, 03:35 PM #22
Similar Threads
-
Daikin fault codes
By Chris2005 in forum Air ConditioningReplies: 45Last Post: 21-03-2012, 10:09 PM -
Leak Testing?
By Thana in forum Trouble ShootingReplies: 36Last Post: 31-08-2010, 02:57 PM -
System Burn Out Troubleshooting
By altaf22m in forum Technical DiscussionsReplies: 13Last Post: 07-05-2010, 09:24 AM -
beacon system freezer
By tony_rich in forum Technical DiscussionsReplies: 0Last Post: 10-02-2002, 07:11 PM