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There is a low side to the system and a high side to the system. After the unit has been running for at least 15 minutes for the pressures to even out, the low side should be at 0psi. The high side should be around 130psi. The high side isn't typically checked unless you add enough freon to get to 0psi and something isn't right and it's not cooling. Then the high side is checked to see if you have a restriction which would cause the high side to be really high like 300 psi or something like that.
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