Explanation Protection for Air Cooled Precision Chiller

The places where need air-cooled precision chiller indicate they have high demanding for operating accuracy. Therefore, the protection settings have to work out. Then, which kind of protection for air-cooled precision chiller should be done?

Discharging temperature protector should be installed on the air-cooled precision chiller in order to protect the compressor when it works with negative high stressing or without enough refrigerants. The temperature detected in the position of 10cm between compressor and exhaust pipe should range within 130±5℃for stopping the compressor.

Low tension switch is set for the safe of air-cooled precision chiller when it operates with not enough compressor refrigerant. When it reaches 0.03mpa, the compressor stops working. Once the compressor runs lacking refrigerating fluid, the temperature of parts of compressor and electrical machinery will rise instantly, so at that time, low tension switch can play a role in protecting them which inner thermostat and exhaust gas temperature protector can not function.

Electromagnetic switch operates on the basis of controlling air cooled precision chiller's cold compressor. When installing shutter which is for engine cutout, it ought to keep upright; if mistakes happen, spring pressure of joint will change, giving rise to make noises and phase-deficient operation. As for the compressor carried with an inner protector for cutting off power directly, it can be free from any loading protector.

High-voltage switch can stop the compressor when the high pressure raises abnormally. The operating pressure is under 3.0mpa.

Inner temperature controller must be installed inside the compressor in order to prevent it from moving at high speed which causes overcurrent produced by high load operation, poor electromagnetic switch and journal sticking or faults including motor burnout owing to motor temperature, which is mounted at the neutral point of three machines. When an error occurs, electrical machine will remain normal by cutting the three-phase machine at the same time.

The structures of the air-cooled precision chiller's anti-phase protector scroll compressor and piston compressor are different. The former isn't able to reverse because the three-phase supply of air-cooled precision chiller will lead to the changeover of compressor. Thus, anti-phase protector should be set for prohibiting the refrigeration compressor from reversal, with which the compressor can run smoothly when there is positive phase; otherwise, it stays motionless. When anti-phase happens, to exchange two lines of the power source can turn into a positive one.

The air-cooled precision chiller of Guanya Refrigeration Technology Co., Ltd in Wuxi sets up multiple failure alarms: over temperature alarm, sensor alarm, high pressure alarm and overheating alarm, avoiding some faults effectively and in time.

The Reasons of Frosting on Ultra low Temperature Recirculating Chillers

Frosting will appear when many users take advantage of ultra low temperature recirculating chillers, while some are not. It is confusing and whether it is relevant to refrigeration.

First of all, why does ultra low temperature recirculating chillers frost? To sort it out, we can turn our eyes on the reasons of direct-cooling ultra low temperature recirculating chillers. The frost is a white crystal of vapour which will congeal on the surface of ultra low temperature objects.

The air will frost on the surface of the inner wall inside ultra low temperature recirculating chillers, which is the root cause. It will affect the heat transfer efficiency, resulting in the decline of refrigerating capacity, so the users should remove it manually.

We understand why the ultra low temperature recirculating chillers will frost on one hand, and for the other hand the air-cooled one is frostless. Are their reasons against each other? The principle of that is the air-cooled ultra low temperature recirculating chillers applies air to refrigerate. When high temperature air flows through the inner evaporator, both of them will change the heat directly because they are in opposite conditions so that the temperature of air will lower.

Meanwhile, cool air is blown in the ultra low temperature recirculating chillers, which is exactly what air-cooled one uses for cycling constantly to reduce its own temperature. However, vapor always exists in the air, so it becomes solid when it freezes, which shows that whenever heat transfer happens, frosting will be in the ultra low temperature recirculating chillers.

In fact, air-cooled ultra low temperature recirculating chillers is carried with frost, but only on the surface of the evaporator. When opening the door, we can not see it because the frost is inside. Thus, we call it as frostless on the whole.

Therefore, we make it clear why ultra low temperature recirculating chillers is out of frosting.

The Noise Analysis of Precision Chiller

Generally speaking, even the most sophisticated refrigerating equipment will also have some trouble when used for a long time. If the noises present in the precision chiller after prolonged use, I am sure that it appears some faults. So let's go deeper to see where these noises are from.

The noise of compressor

The compressor is in the core position of the inner structure of the precision chiller. In general, compressors include screw and stroll, you can pick up one as what you need. Once the compressor has some noise, the first thing you should do is to check out if the expansive valve is open excessively; if so, you ought to adjust it. Next, you should see if the freezing medium is overmuch; if so, you had better remove the needless refrigerators.

The noise of water pump

It is attributable to the water quality mainly if the water pump has some noises. I suggest that water treatment should proceed according to the requirement of the chillers.  

The accessories lack lubricant

The configuration of most of chillers is made of metal. Once the accessories are short of lubricant, the frictions can not be avoided, making some noises. Besides, you have to keep maintenance in daily life to reduce the rate of faults.

Oil starvation because of overload

You can find out whether the compressor is fuel elan when there are some noises. If it is, you can refuel it. To check if the compressor is overloaded will help you solve it in time.

Through the introduction of precision chillers, you must have a better understanding. If you are eager to further study, you can follow Guanya Refigeration Technology Co., Ltd.