romanowski72
10-08-2014, 09:46 PM
I apologize for the lack of info on this unit. It is a unit that has fresh food section on the left side and the right side is freezer, this is a commercial unit and each section has its own complete cooling system.
I got the call saturday evening and the unit was not cooling properly(about 20F), its a reachin and they warm up quick from people opening doors; as well the condenser was pretty plugged up, so I cleaned the condenser and it slowly pulled down to 11F.
This is a cap. tube system, there is no tag or marker anywhere that I can find, there is a 414b sticker on the freezer side evaporator, but it is a r22 copeland evaporator. This leads me to believe the unit was pulled from something else, My reasoning behind that is that I think R22 is med-high refrigerant not so much for low temp applications. I have not ever worked with hotshot, I even tried to look it up in my old text book but no mention, I know we had it in the shop; but i never used it.
I did not hook up a high side gauge just the low side:
Ambient 80f
air leaving condenser 98f
low side pressure while running 4psig
I forget the sh but it was high around 50f
I shut down the unit to see what my pressure did to see if I could get a accurate temperature for pt, chart and it went up to 30psig which does not make sense with either r414b or r22
I know the evap is starved only 1/4 of it had frost.
I called the customer this morning to get temperature of box, and he said the compressor was not running. I know the compressor was hotter than my pt chart goes up to. 145-150f
Know with the compressor off I should be able to get accurate reading to figure out what kind of refrigerant it has. If it is r414b WILL IT GIVE ME STRANGE PRESSURE READINGS POSSIBLY BECAUSE OF FRACTIONIZATION?
Does anyone have any advice on this I cant really do anything until I can figure out what refrigerant is in it, If the compressor burned up(i will check it either today or tomorrow) should I change it to another refrigerant.
If you need anymore info or questions please let me know. Next time I go in I will bring pen and paper.
Thanks
I got the call saturday evening and the unit was not cooling properly(about 20F), its a reachin and they warm up quick from people opening doors; as well the condenser was pretty plugged up, so I cleaned the condenser and it slowly pulled down to 11F.
This is a cap. tube system, there is no tag or marker anywhere that I can find, there is a 414b sticker on the freezer side evaporator, but it is a r22 copeland evaporator. This leads me to believe the unit was pulled from something else, My reasoning behind that is that I think R22 is med-high refrigerant not so much for low temp applications. I have not ever worked with hotshot, I even tried to look it up in my old text book but no mention, I know we had it in the shop; but i never used it.
I did not hook up a high side gauge just the low side:
Ambient 80f
air leaving condenser 98f
low side pressure while running 4psig
I forget the sh but it was high around 50f
I shut down the unit to see what my pressure did to see if I could get a accurate temperature for pt, chart and it went up to 30psig which does not make sense with either r414b or r22
I know the evap is starved only 1/4 of it had frost.
I called the customer this morning to get temperature of box, and he said the compressor was not running. I know the compressor was hotter than my pt chart goes up to. 145-150f
Know with the compressor off I should be able to get accurate reading to figure out what kind of refrigerant it has. If it is r414b WILL IT GIVE ME STRANGE PRESSURE READINGS POSSIBLY BECAUSE OF FRACTIONIZATION?
Does anyone have any advice on this I cant really do anything until I can figure out what refrigerant is in it, If the compressor burned up(i will check it either today or tomorrow) should I change it to another refrigerant.
If you need anymore info or questions please let me know. Next time I go in I will bring pen and paper.
Thanks