I don't know much about HVAC so TIA for any help....
I have a 10 year old central A/C system, Lennox condenser for the A/c side and a Lennox gas furnace for the heat side. The cooling side is a two part system, the condenser outside and the coils inside the garage. I live in Florida and the unit is a 5 ton system. Yesterday I had a HVAC service company come by and do a checkup of the system. Even thought the system is old, it has been running fine. Within 5 minutes looking only at the condenser, I get the "bad news". The refrigerant pressure on the gas side is very high. Looks to me like it was off the high end of his gauge which tops out at about 350psi using his 3 color device. Outside temperature was ~92 degrees. He didn't get a pressure reading of the liquid side (low pressure side?). He also showed me that the compressor is pulling double the amount of amps vs. rated (A reading of both the red and the black wires combined). Then he told me that the compressor is going to die soon follow by a sales pitch for a complete upgrade of the A/C side. Later, on my own I noticed that the schreoder(sp?) valve on the liquid (low pressure) refrigerant side was leaking but the cap was keeping the leak under control. The whole thing struck me as being a little too neat but I do know my system is old.
So here are my questions:
(1) I guess the main question is if this guy is trying to game me?
(2) Is it normal to have a pressure release valve in such system?
(3) I think I see a flow adjustment dial on the copper line that is the gas refrigerant side. Could the high pressure reading come from closing down this dial and more importantly how do I adjust this dial to get the right amount of refrigerant flowing back to the condenser? The dial label reads something like "1/12 turn??". Sorry it is dark outside so I am going from memory.
(4) I know part of the answer is to get another tech in. But I just want to make sure that I do what I need to do between now and when the next guy comes thru. So let me ask anyway.. what should I do next?
(5) I notice that part of the outer rubber insulation on the liquid refrigerant line running to the garage is worn off. The inner rubber tubing is still fine. What is the best fix for this?
(6) Any other advices?
Thanks in advance!!