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  • What causes the low pressure alarm in the server room air conditioner?
    May 13, 2022
    A data center server room has a high voltage alarm, check the machine alarm logs in a total of three categories: First, low supply voltage does not start. Low power supply voltage does not start is often due to voltage reduction or phase failure, low supply voltage, resulting in 24v transformer output voltage is insufficient; condenser 24v AC contactor can not work. The specific need to use a multimeter to test to determine. If necessary, equip with grid regulator. Compressor failure alarm is one of the most common alarms in the server room precision air conditioning, in the refrigeration system, the high voltage controller is set at 350psig, the machine is running, when the high voltage value reaches this limit, the high voltage alarm is generated. To make the compressor start again, it must be manually reset; however, before pressing the reset button, the cause of the high pressure must be identified in order to make the machine run normally. Second, the compressor high pressure alarm. For refrigeration systems, it is recommended to clean the surface of the condenser dust and dirt, but care should be taken not to damage the copper tubes and fins. If the alarm still appears after maintenance, the alarm can be eliminated by performing maintenance in the system menu, maintenance cycle. Third, the humidifier refrigeration system needs maintenance. It is usually caused by an obstacle in the refrigeration cycle, such as too high Freon pressure, too low pressure or the resulting overheating of the press and other reasons. The specific need to use the pressure gauge to test to determine. For the humidifier and refrigeration system requires maintenance of the alarm processing, humidifier normal operation process, mineral particles and other deposits will gather on the humidifier pan. These deposits must be regularly maintained and removed to ensure efficient operation of the humidifier. As water sources around the world have different characteristics, so the time of cleaning gradually should be decided by each place itself. It is recommended that monthly maintenance checks be performed on precision air conditioners in data center rooms (if necessary, they should be cleaned monthly). By draining the pan (removing the vertical pipe), disconnecting the drainage pipe coupling and removing the set screws at both ends of the pan, the deposits on the pan of the humidifier can be easily removed.
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  • Machine room air conditioning and refrigeration equipment zero line charged causes and solutions
    Jul 20, 2022
    Will the zero line of the air-conditioning and refrigeration equipment in the server room be charged? Under normal circumstances, there should not be electricity on the zero line. Therefore, once there is electricity, it is certainly the performance of the fault; the simplest is electromagnetic induction, and this time the zero line is not well grounded, failing to form a circuit. Meanwhile, the leakage of power equipment or phase line touch shell, but the current is not considered large, so it has not tripped. In the three-phase four-wire power supply system, if the zero line is not well grounded or grounding end broken, the consequence is that the potential of the zero line is not equal to 0 when the three-phase load is unbalanced, which means that the neutral point is shifted. Here are the causes and solutions of machine room air conditioning common zero line charged. A. There is leakage of electrical equipment on the line, and the protection device at the end of the action, so that the zero line with electricity. (Solution: power outage for maintenance, to find the leaky equipment to repair, and find the cause of the end of the action of the protection device.) B. There is a phase on the line ground, the total protection device in the grid at the end of the protection, so that the zero line charged. (Solution: After a power outage, first use a shaking table to measure the line to see if the line is poorly insulated, measurement should pay attention to the instrumentation in the line to disconnect.) C. Room air conditioning zero line break, there is leakage in the electrical equipment behind the break or a large single-phase load operation, so that the zero line charged. (Solution: test the zero line is broken after the power failure, broken to find and repair.) D. In the zero grid, there are individual electrical equipment to take protection grounding and leakage, so that the zero line with electricity. (Solution: distinguish between the system is a zero system or grounding system, or zero system for repeated grounding. Then the correct installation of the ground.) E. In the zero grid, there is a single-phase electrical equipment using "a fire a ground" that is no work zero line, so that the zero line with electricity. (Solution: Install the N line, not PE line as N line.) F. In the grid there are electrical equipment insulation resistance, has been damaged and leakage, so that the zero line is charged. (Solution: Check out the insulation resistance does not meet the requirements of the equipment, to repair.) G. Room air conditioning in the transformer low-voltage side of the working ground connection poor contact, there is a large resistance in the three-phase load unbalance current exceeds the allowable range, so that the zero line charged. (Solution: poor contact is not good to find, to be serviced annually or according to the prescribed time, can not be lazy, to be serviced according to the regulations.) H. High-voltage flee into low-voltage, so that the zero line charged. (Solution: bad to find, and sometimes a big problem. One of the most difficult to deal with, there is a danger to people. Be sure to follow the operating procedures to operate.)
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  • How does a data center-level thermal management system work?
    Sep 09, 2022
    While there are several different types of precision air conditioning or thermal management systems designed to meet the unique needs of each application, all systems generally work in the same way. The device uses one or more units installed in the IT space to provide the optimal air temperature for the IT equipment's inlet fans, whether around the room perimeter, in a row, or on a rack or ceiling (if floor space is at a premium) . These internal units use refrigeration or rely on cold water or glycol based coolants to cool the air. They use fans and airflow to direct cool air to the right spot. At the same time, the hot air produced by the equipment is collected and exhausted from the IT space. The cooling unit of the thermal management system removes heat in one of several ways: By directing it to the chilled water plant of the building. Chilled water cooling systems, such as the innovative Coolnet Cybermaster Series, are a good option for large data centers that can use chilled water equipment. For smaller spaces or high-rise buildings where air cannot be excluded, compact perimeter cooling solutions or even precision ceiling-mounted cooling systems such as the chilled water version with small footprint Coolnet Cool-smart efficiently captures and sends heat to a building's chilled water plant through a common plumbing loop. Say no to it by being outdoors. Air-cooled direct expansion systems pair an indoor computer room air conditioning (CRAC) unit with an outdoor heat rejection unit and use the outdoor ambient air to cool the refrigerant. These systems are very reliable because they do not rely on other building systems to cool the exhaust heat. However, each unit requires its own plumbing and outdoor cooling unit, which takes up valuable space. By rejecting it into a warm building water cycle. Water-cooled direct expansion systems, such as Coolnet Cybermaster DX Series connect multiple indoor CRAC units to a warm building water circuit, usually a cooling tower system, with the refrigerant cooled by process water. Small to medium rooms in facilities where building water systems exist are ideal for this solution. By connecting to an outdoor fluid cooler, such as a dry cooler. A glycol cooled direct expansion system connects multiple indoor CRAC units to a dry cooler circuit and a pumping system that circulates warm water glycol antifreeze to cool the refrigerant. Small to medium sized rooms can benefit from these types of systems, but must have enough roof space to accommodate the dry cooler and pump. Direct cooling of equipment by using specialized liquids. Liquid cooling is emerging as an alternative to IT thermal management. If you've ever burned your fingers badly, you know that air (i.e. blowing on your fingers) is usually not enough to relieve the burn. You need to move your fingers in cold water to relieve stress. Breakthrough liquid cooling systems use liquid instead of air to cool IT equipment for better results. Cold liquid is circulated to cold plate heat exchangers embedded in IT equipment. This provides extremely efficient cooling because the cooling medium goes directly to the IT equipment rather than cooling the entire space. However, it requires dedicated IT equipment with built-in liquid/fluid heat exchangers. Liquid cooling is most practical for high-density or high-performance computing applications where the heat is most intense.
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