Hi all, FNG here in the A/C world. Mechanic for the last 18 but just started messing with A/C after taking a quick course thanks to Fleetpride. I had a truck with a dead compressor, leaking at the front seal. Replaced it, drier/filter, expansion valve, and a high pressure line from drier to expansion valve due to rust. In Vermont we like to put brine on the roads to rot everything in, on, and under the vehicles all in the name of saving some road side weeds.
Anyway, flushed entire system, pulled a vac on the system for 50 minutes today, leak test for 10 and passed. All on a Robinair unit. Charged system with 3# of 134A per label on truck. Bad low pressure switch so replaced that as well. At ambient around 80-85°F about 65% humidity, my low was hanging at 20 pounds and high side was around 145, A/C on max recirculate windows open. I had 40°F in center vent.
According to charts I've seen I'm low on both low and high side. If it cools this well can it get any better?
At the 3# both lines at the expansion valve from evaporator were cold and wet. Just for a test I added another ounce. Now the return side of the evap started to frost up. Is that a sign there is almost liquid coming back? Just a tad too much? I didn't have my infrared temp gun to see where the condenser temps were.
Thanks for any help, this was a dark art prior to last week but I'm trying to get the hang of it. At least it makes sense now.
Anyway, flushed entire system, pulled a vac on the system for 50 minutes today, leak test for 10 and passed. All on a Robinair unit. Charged system with 3# of 134A per label on truck. Bad low pressure switch so replaced that as well. At ambient around 80-85°F about 65% humidity, my low was hanging at 20 pounds and high side was around 145, A/C on max recirculate windows open. I had 40°F in center vent.
According to charts I've seen I'm low on both low and high side. If it cools this well can it get any better?
At the 3# both lines at the expansion valve from evaporator were cold and wet. Just for a test I added another ounce. Now the return side of the evap started to frost up. Is that a sign there is almost liquid coming back? Just a tad too much? I didn't have my infrared temp gun to see where the condenser temps were.
Thanks for any help, this was a dark art prior to last week but I'm trying to get the hang of it. At least it makes sense now.
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