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I am really new to the AC world, and took my first readings today on a unit I posted about a few weeks back, and now have a few newbie questions. As I set up the gauges, I found valves for both the ref & vac connections, but the ports were 'live' when I screwed my gauges on. Should these be turned off or what is procedure here? I found the cond unit to be totally clogged, and used NuBlast to clean the coils, and can now see right through them. After running about 40 min, I got 124psi on the ref line, and 33 on the vac. Does this sound like I got a real reading on the two pressures? Ref line was 88* and vac was 64.5*. The issue is the coil in the furnace freezes up, but the cond unit has been totally clogged for some time.My gauges have 4 knobs, (blue, red, 2 yellow hoses) all were closed when reading pressure. I ordered 2 very large books from Dan to dive in, but missed the install & troubleshoot 1&2 classes offered this summer.
Just a guy running some pipes.