Vintage Air / Sanden compressor troubles

[parsonsj]

I'm charging a brand new system. Vintage Air Gen IV, Sanden compressor, binary switch.

All new.

I evacuated the system (30" for two hours). Turn off vacuum pump, system holds vacuum without any needle movement at all for 2 hours. All is well.



Static pressures are 80-110psi (depending on ambient), and when I start the A/C, low side goes to 55psi, and high side goes way high. 350+, and the binary switch cycles it off. It drops to 250, cycles back on, and goes back to 350+. Cycles take 30s or so. Ambient temps are 80ish. Outlet air temp is 68*.

I've only charged the system with engine running for 5 minutes or so. Hardly at all. I can't believe I've got an overcharging condition. Yet those high side pressures are alarming.

Any ideas?