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What Is the Status of Cold Storage in Normal Operation?

Sep. 07, 2020

1. There should be no noise in the cylinder, only the normal and regular cold storage noise of the suction valve.

2. The suction temperature of the cold storage compressor should be 5-15℃ higher than the evaporation temperature (R22).

3. The reading of the oil pump pressure gauge should be 0.15-0.3mpa higher than the suction pressure.

4. There should be no foot heating and frosting on the cylinder wall, and the surface temperature difference should not be greater than 15-20 degrees. For refrigerated or low-temperature systems, the frosting of the suction pipe can generally reach the suction port; for high-temperature conditions, the suction pipe should No frost, generally dew is normal.

5. The crankcase oil temperature of the fluorine refrigerator does not exceed 70 degrees, and the minimum is not less than 10 degrees. Fluorine refrigerator lubricating oil may have foam.

Cold Storage

6. The oil level of the crankcase is not less than 1/2 of the horizontal centerline of the sight glass.

7. The automatic return pipe of the fluorine oil separator is normal when it is cold and hot. There should be no significant temperature difference before and after the filter of the liquid pipe cold storage, let alone frost, otherwise it will be blocked. The cylinder head should be half-cooled and half-warm, and the joints should not leak oil.

8. Hand-touched horizontal accumulators and oil separators should be hot at the top and cool at the bottom, and the liquid or oil level at the junction of hot and cold. The safety valve or bypass valve should be cold at the low-pressure end, otherwise high and low-pressure gas should flow.

9. The evaporating pressure and suction pressure should be similar during operation, and the exhaust pressure and condensing pressure should be similar to the accumulator pressure.

10. There should be a temperature difference between the cooling water in and out. If there is no or very slight temperature difference, it means that the heat exchanger is dirty and needs to be cleaned.

11. The refrigerator should be sealed, and no refrigerant or lubricating oil should be leaked. The shaft seal of the fluorine refrigerator should not drip oil.

12. The valve body of the expansion valve is evenly frosted or condensed, but there should be no thick frosting at the inlet. When the fluid passes through the expansion valve, only a dull, small sound can be heard.

13. The pointers of the pressure gauges in the system should be relatively stable and the temperature indication should be correct.

The above information is provided by fresh-keeping cold storage factory.