Fault symptoms of Dunham Bush refrigerators
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It is a dual-head fully enclosed refrigeration unit with an air-cooling system; the set outlet temperature is 7 degrees Celsius, but the actual temperature is 14 degrees. The liquid level in the evaporator cannot be seen. The low pressure is 560 kPa, while the high pressure is above 1200 kPa. There are many bubbles in the sight glass of the economizer’s liquid outlet pipe, and more than half of the liquid (or is it oil?) is present in the sight glass of the return air pipe at the top ). Help, what are the possible causes of cooling issues?
Was the problem solved? It is recommended to adjust the injection and add 2 barrels of refrigerant.
Is the refrigerant R22? The low-pressure value is 5.6 kg, which is considered normal. What is the load rate? Is there an electronic expansion valve, and if so, what is its opening degree? What is the exhaust temperature? A temperature of around 100 degrees indicates a lack of refrigerant, while a temperature below 50 degrees means that the exhaust superheat is too low. Is the system operating at full load?
How long has it been in use, and what is the heat exchange efficiency of the evaporator?