Problems with the refrigerator
Thread Content
In a piston-type refrigerator, the exhaust pressure increases while the suction pressure decreases. Why does this phenomenon occur? Do screw-type refrigerators not experience this phenomenon?
It might be blocked, which is why this happens; regardless of the type of unit, if it’s blocked, this situation will occur
It’s possible that an oily liquid has appeared on the condenser. The condenser needs to be cleaned, or there may not be enough refrigerant. If it’s not one of these issues, please check whether the instruments on the equipment are working properly. :handshake
Reply to 3# jsf1987: To correct what you said: 1. When there is no refrigerant left, the exhaust pressure will also decrease. 2. There are generally non-condensable gases inside the condenser, not liquids as you mentioned (and even if there were liquids, they would flow out). Non-condensable gases can only increase the condensation pressure (which is equivalent to the exhaust pressure), but the evaporation pressure will rise. Therefore, I cannot agree with your view. I’m providing a reasonable answer for the person who asked the question, based on facts alone; feel free to offer your criticism.
I’m sorry, but our company does not have freeze-drying equipment; we only use hot-air drying equipment, so we cannot assist you. It is recommended that you contact the technical department of manufacturers that supply freeze-dryers, as they will be able to provide you with more detailed information
Exhaust pressure too low: A. Insufficient refrigerant: Check for leaks and replenish the refrigerant. B. Cooling water temperature is too low: Adjust the flow rate. C. Clogged dry filter: Clean and replace the filter element. Excessively high exhaust pressure: A. Excessive refrigerant: Remove excess refrigerant. B: The cooling tubes of the condenser are dirty: they need to be cleaned. C. Cooling water filter clogged: Clean it. D. The cooling tower does not provide good cooling performance. E. The inlet and outlet temperatures of the cooling water are too high. F. The pressure gauge is inaccurate
The exhaust pressure is high while the intake pressure is low; it’s possible that there is a blockage somewhere in the system. Let’s check the dry filter first, and then the throttle valve.