Jim
What refrigerant are you using? My system works great for 30 mins & then my high side pressures go thru the roof & I lose cooling? I know it is hooked up correctly as it works well when i first charge the system.
I have spent many hours trying to figure it out. I am wondering if the industrial 12a I am using is to cold for the txv orfice causing freeze up? May need to try 134a? Unfortunately I would have to spend a $150 just to try it because we can not buy it in the store here.
Thanks Barry
Freeze-up is usually caused by minute amounts of moisture deposits at the orifice tip when the liquid Freon flashes to a gas (at that point the moisture flashes to ice). Its a little simplistic an explanation but if your experiencing a freeze-up at the orifice tip that is what I would suspect. Did you evacuate the system (with an A/C evac pump) for 1/2 hour or more before you injected the refrigerant? One place many forget to watch out for, is displacing the 'air' in the hose between the refrigerant and the connector used with a small burst of refrigerant through the hose before completely tightening the hose on the device connector (hose on bottle tight, loosely on the other end, open valve slightly until refrigerant comes out of far end, then tighten connector at device fitting). The air in the hose just may have enough moisture in it to cause problems like this. Just a thought for you to consider... Good luck!