Using an Electronic Expansion Valve (EEV) has many benefits for you and your customers, so let’s look at some of the top reasons to choose an EEV. 

First, an EEV provides more precise superheat control. Most refrigeration systems equipped with Thermostatic Expansion Valves (TEVs) will operate at inappropriate superheat even if they are set correctly at startup, because changes in ambient and system conditions cause the superheat to drift over time. Think of it another way, a refrigeration system operates in summer and winter conditions. Without manual adjustment, the TEVs cannot compensate for changes in system conditions, so they often operate at very high or dangerous superheats. With an EEV, think of a CORESTAR controller as a field technician who is on call 24/7, constantly fine-tuning the valve with a wrench to keep the superheat as accurate as possible. This also saves you time during startup or maintenance, as you don’t have to wait for the system to cool down before adjusting the superheat. And, you don’t have to stand in the freezer or cold room to adjust the superheat. The controller does it for you. If you want to adjust the target superheat, you can easily do it through the controller, smartphone, tablet, PC, on-site or remotely. 

CORESTAR controllers have a variety of protection functions, such as: Low Superheat Protection (LowSH), Low Evaporating Temperature Protection (LOP), High Evaporating Temperature Protection (MOP), Low Superheat Protection will close the valve at low superheat. This means that if the fan fails, the coil is frozen, or low superheat occurs for any reason, the controller will do its best to protect the compressor. This is something that a thermal expansion valve cannot do. In the past, it was enough to stock a few types of TEVs to meet the needs of most on-site systems, but with the continuous change of regulations, the replacement of refrigerants is also changing with each passing day. Today, having the right TEV means that you need to keep a large inventory or waste time frequently contacting the dealer. EEV is compatible with most refrigerants on the market, which can significantly reduce your inventory. CORESTAR controllers are pre-programmed to support most common refrigerants (currently 43), and new refrigerants are constantly being added. EEVs are not only compatible with a wide range of refrigerants, but also offer the flexibility to provide a wider range of capacities and evaporating temperatures. 

With a CORESTAR controller, EEVs can often operate at as low as 10% or even lower capacity. This means that one EEV can cover the capacity range of multiple TEVs, further reducing the number of truck down times, and also means that the temperature can be reduced faster after defrosting, and it can operate at a lower pressure difference if needed. In addition, EEV selection is also easier than thermostatic expansion valves (TEVs). The most common mistake we find is that the EEV is too small. 

In addition, using EEVs can save energy. In combination with CORESTAR controllers, using EEVs can save the system energy by about 15%. If you add the system's energy-saving algorithms (such as floating set points), the overall energy saving can reach 20%. Finally, with CORESTAR controllers, you can remotely monitor superheat, suction pressure, temperature, valve position and a range of other important data. You can also adjust set points and access performance history, which is essential for system diagnostics. All this without the need to connect dedicated instruments or even visit the site. This saves you time diagnosing your system and often avoids emergency service calls in the middle of the night or on weekends. When a service call is needed, the performance history can help you gain insight into the problem and prepare you for it. 

To summarize the advantages of using EEV: 

• EEV can control superheat more accurately. 
• It can protect the compressor at low superheat. 
• It can significantly reduce your inventory. 
• It can be better compatible with new refrigerants. 
• It has a wider capacity range and is easier to select. 
• It can save energy by 15%~20%. Combined with CORESTAR controllers, you can serve customers faster and better and reduce after-sales service costs.

The composition of precision air conditioning includes not only compressors, condensers, expansion valves, and evaporators, but also fans, air filters, drying filters, humidifiers, heaters, sight glasses, oil storage tanks, solenoid valves, etc. Therefore, in our daily computer room management work, the management and maintenance of precision air conditioning are mainly aimed at maintaining the above components.

Daily maintenance and management of precision air conditioning

1. Maintenance of control system:
1) Check whether the various functions and parameters of the air conditioning system are normal from the display screen of the air conditioning system;

2) If there is an alarm, check the alarm record and analyze the cause of the alarm;

3) Check if the temperature and humidity sensors are working properly;

4) It is important to have a clear understanding of the operating parameters of the compressor and humidifier, especially during the first inspection in the morning. It is important to compare the operating parameters of the compressor from the previous night with those from the same period before

2. Patrol inspection and maintenance of compressors:
1) By listening to sound, one can accurately determine the operation of the compressor. When the compressor is running, its sound should be uniform and rhythmic.

2) By touching it with your hands, you can determine the degree of heat generated and roughly determine whether the compressor is operating beyond the specified pressure and temperature.

3) Visual method: mainly observing the liquid level of refrigerant through a night vision mirror to see if there is a lack of refrigerant.

4) The method of measuring the amount is mainly to measure the current, suction and exhaust pressure, and suction and exhaust temperature during the operation of the compressor, which can accurately determine the operating condition of the compressor.

3. Patrol inspection and maintenance of condenser:
1) Check the fixing condition of the condenser and see if there are any signs of looseness in the fixing parts of the condenser to avoid damage to the refrigerant pipeline and outdoor unit. Check the insulation condition of the refrigerant pipeline for any damage.

2) Check the operation of the fan: mainly check the working condition of the bearings, base, motor, etc. of the fan, whether there is any abnormal vibration during the operation of the fan, and whether the fan blades are in the same plane when rotating.

3) Check if the condenser is dirty or blocked, and if there are any debris below that affects the smoothness of the air duct, thereby affecting the condensation effect of the condenser; Check if the fins of the condenser are damaged.

4) Check if the speed control switch is normal. Generally, the condenser of an air conditioner has two speed control switches, which are divided into temperature and pressure speed control. The new control technology now uses dual pressure speed control.

4. Inspection and maintenance of evaporator and expansion valve:
The maintenance of the evaporator and expansion valve mainly involves checking whether the evaporator coil is clean, whether there is frost phenomenon, and whether the drainage tray of the evaporator is unobstructed.

5. Inspection and maintenance of humidification system:
1) The humidification tanks of air conditioners are generally electrode type. If there is too much sediment and it is not washed in time, it is easy to scale on the electrodes, which will affect the service life of the humidification tanks.

2) Check if the operation of the water supply and drainage solenoid valves is normal.

3) Check if the drainage pipeline of the humidification tank is unobstructed, so that drainage and maintenance of the humidification tank can be carried out smoothly.

4) Check if the steam pipeline is unobstructed to ensure that the water vapor in the humidification system can humidify the computer equipment normally.

5) Check if the water leakage detector is working properly, which is an important part of the humidification system because if the drainage pipeline is not unobstructed

Carbon dioxide is non-toxic, but it cannot provide human respiration. This is a suffocating gas. According to the Indoor Air Quality Standards, the daily average carbon dioxide CO2 is 0.10% (0.10%=1000ppm). If there are many people in the room and the air is not circulating, the oxygen content in the air will be relatively reduced and a large amount of carbon dioxide will be produced. There may be varying degrees of poisoning symptoms indoors. For example, when the concentration is 0.07%~0.1%, it belongs to ordinary air. Some sensitive people may find it unpleasant to smell; When it is 0.1%~0.15% (1000ppm~1500ppm), it is the key air, indoor air begins to deteriorate, and the human body begins to feel uncomfortable; When it reaches 0.15%~0.2%, the pollution is relatively light, and above 0.2% is severe pollution; Between 0.3% and 0.4%, individuals experience deeper breathing and symptoms such as headaches, tinnitus, and increased blood pressure; When it reaches 0.8% or higher, it will lead to death.