Semi-hermetic piston refrigerator for cold storage.
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This is my first time on this forum; I’m seeking advice. Two refrigerators in the cold storage have developed problems: With the first one, within 2 minutes of startup, the suction pressure of the compressor gradually decreases, until eventually the low-pressure relay activates and the refrigerator stops working. Looking at the refrigerant sight glass, it seems there is oil present, and the compressor oil level gauge is filled with bubbles. For the second unit, within 2 minutes of startup, the condensation pressure increased steadily, the condensation temperature was high, the high-pressure relay activated, and then it tripped. Is the condenser coil clogged? I would like to ask what the reasons are; the evaporators of the refrigerators are air-cooled units, and they are all located inside the cold storage room.
Is the first compressor having less air intake while the second one has more? Is it because the valve of the first device isn’t open?