What is the routine inspection for refrigeration units?
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Our company’s chiller units are York models, with a chilled water temperature of 10 degrees. We’re not sure how to manage this situation and don’t know where to start. Please, fellow sailors, help me. Add me as a friend. I learn from you*.
Ours is also from York. We have it divided into three groups, and it’s common for a single unit to stop operating; the fault indicated is protection by high-voltage switch #, which is usually caused by high exhaust pressure in the condenser. Reason: It was caused by a clogged cooling water filter in the chiller.
This temperature is for chillers manufactured in York; their heat exchangers are made of copper tubes that are thin-walled and have cut threads, making them extremely prone to leakage.
Ours is a Carrier unit, and it’s even worse – it runs for five minutes and then stops for five minutes; it seems like it’s about to break down. Do you have any good suggestions?
Is it because the start and stop of the chiller unit are automatically controlled based on temperature? Therefore, the inlet water temperature should be regulated so that the unit doesn’t start and stop repeatedly.
It’s a good idea, but doesn’t the inlet water temperature decrease as the outlet water temperature drops? These two are in direct proportion; how to control it? Seeking help
Oil filter pressure difference: It should normally be below 20; if it exceeds 20, attention is needed as it can easily reach the value that causes the system to shut down. The opening degree of the slide valve corresponds to the load – too low an opening isn’t good for the compressor’s operation. York technicians say this is very important as it affects the oil. Other factors include the pressures in the evaporator and condenser, as well as the superheat difference. During regular inspections, pay attention to the level of refrigerant
We observed that in some processes, the chilled water coming out of the chiller has a pipeline that leads back to the cooling tower; at first we didn’t understand what purpose this served, but later we realized that this pipeline can be used to adjust the water temperature； Also, in our system, a pipe is connected at the bottom of the water cooling tower to the upper water supply pipe of the tower, which serves to regulate the water temperature as well.
The chiller operates under variable load conditions, as its cooling capacity is quite high. One of our chillers runs continuously, while the other operates intermittently; however, it is possible to control the frequency of its start-up and shutdown by setting the water temperature or regulating the temperature of the circulating water in the circulation system ! ! !
During routine inspections, the following is mainly checked: 1. Whether the temperature of the low-temperature water meets the process requirements； 2. Temperature difference between the saturated temperature corresponding to the evaporator pressure and the low-temperature water temperature ； 3. Refrigerator pressure, oil pressure difference, and load