Question about Victory Commercial Freezer VSF-3
Freezer was at 20degrees when I arrived. Top of compressor was hot, pulled top off evaporator and coil was only frosted about half way across the top and half way down the front side where the Cap tubes enter. I checked the condenser and condenser fan which appeared to be fine, The unit was turned all the way up, the condenser fan was running and the condenser coil had been cleaned off. Diagnosis was that it was low on 404A . Added refrigerant and unit began to pull down slowly, I added refrigerant a little at a time and waited 15 min and checked progress and then added again, repeated several time. The last time I checked it it was at zero and I assumed it would cool on down. got a call today, they said it was at 25 again last night, it was at 10 degrees this morning and then when I got there at 3:00 it was at 3degrees. I pulled the top off the evaporator housing and the evaporator had the same frost patteren it had when I got there yesterday. What do I do or check next. Can I get a chart of the operation of this system? It is a Victory Commercial Freezer VF-1 They want to run it at about 10 below zero. They said it was working fine till 2 days ago. also at 0 degrees, what should the pressures read on this freezer?
Check out "victory-refrig.com" for manuals, diagrams, etc.
Cap tube systems are "critical charge systems". Can be difficult to get right. You did not mention pressures that you had. The split on the evap vs.box temp is almost always 10 degrees for freezers. If you want a -10 box, your evap needs to be -20. As a general rule of thumb, you want the high side to be "ambient +30". This seems to work most every time. Your problem might be operations related. Them leaving the door open alot and so on. It could also be a problem with the evap fan or the control to it. It could also be that since there had been a problem with the unit, they are now constantly checking it. Could be checking during a defrost cycle. When your box is at 0 degrees, your pressure should be about a -10 and no less that a -15 degree for the evap. You may have to babysit this thing and see how far it will pull down. You may have a weak compressor. Also, I have had many Hobart freezers fail due to dirty condensers. This causes the oil in cap tube systems to gel and clog up the cap tubes. The only fix is replacing the cap tube. There are alot of variables here so be patient, it's not going to be a quick fix. One last thing, since R404A can fractionate, you really need to pull the charge out and weigh in the correct charge with virgin refrigerant. This will eliminate 2 things. 1, it will ensure the correct amount of refrigerant and, 2 no chance of having a poor mixture of refrigerant in the system causing inconsistant readings and performance.
Hope this helps. And remember, cap tube systems are performance measured by the amount of superheat just prior to the unit making temp and cutting off.
Posted on Mar 07, 2009
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