Thermal expansion valve adjustment (txv)

[Richard Kollmann, Kollmann Marine Inc.]

RE: Performance of Large Refrigeration Unit

I am sorry I don’t remember your refrigeration system. I either look at systems or answer fifteen refrigeration email questions per week so I can’t remember each one.  Your system should work now as well as it did before and yes fine tuning of the system should correct the current problem. The best way for me to help you is for you to send a description of your system: type compressor, type of condenser, type refrigerant and the type of electrical controls that can start and stop the compressor. Also advise if you have a servicing gauge set.I am confused, you listed one freezer plate and one refrigerator plate and then you say the Three together? Also there is only one expansion valve and it is externally equalized? Where in the equalizing line connected?

 

[Fred Ficarra]

Richard, first, thanks for your help setting up my system with an R12 replacement, this summer. We cruised to Canada and the system worked well last month. The freezer did not do as much work as the old plate that had half the capacity. The refer plate, on its circuit (three, altogether) was very cold. (near freezing) The freezer plate has twice the BTU capacity as the plate I used for the 10 years prior to our rebuild, but seems to be doing no more than the same amount of work. It is set up the same as the old system. Can I make it colder and more efficient by adjusting the superheat valve on the externally equalized TXV? Seems the refer plate is doing most of the work. Ice cubes are made, but no faster than the old plate with less that half of the capacity. Should I just turn the adjusting nut to get lower high side pressures and higher low side? (more flow and work from that circuit)

 

[Fred Ficarra]

Phil, this threads redundant, would you hit the

delete button?