Owen Aaland
Well-known Member
I've got a 2-110 in the shop that the customer said had been worked on several years ago but had never worked very well and now has not worked for a couple years. It has been converted to R134A with a Sanden compressor. The evaporator and heater core have been replaced with the one piece unit and block style expansion valve like the newer tractors.
The system appeared to be low on refrigerant but did have enough in it the compressor was running. The low side would drop into a vacuum condition and the high side would run at less than 100 psi. After adding refrigerant I was able to get the low side stable at 4 psi and the high side at 190 psi. Ambient temperature was about 78°F. Outlet temperature in the cab never got less than 60°F. I have cleaned the cab filter and have good airflow through the evaporator. Low side hose gets some frost on it at the expansion valve but not at the compressor.
My question is, is this the best performance this system can deliver or is there a problem I am overlooking?
The system appeared to be low on refrigerant but did have enough in it the compressor was running. The low side would drop into a vacuum condition and the high side would run at less than 100 psi. After adding refrigerant I was able to get the low side stable at 4 psi and the high side at 190 psi. Ambient temperature was about 78°F. Outlet temperature in the cab never got less than 60°F. I have cleaned the cab filter and have good airflow through the evaporator. Low side hose gets some frost on it at the expansion valve but not at the compressor.
My question is, is this the best performance this system can deliver or is there a problem I am overlooking?