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High-pressure failure of chiller and treatment measures

There are two types of air-cooled chiller and water-cooled chiller in the industry. The chiller is divided into low-temperature chiller and normal-temperature chiller in terms of temperature control.
Normal temperature is generally controlled within the range of 0-35 degrees. The temperature control of the cryogenic machine is generally in the range of 0 degrees to minus 100 degrees. It is a kind of water cooling equipment, and the chiller is a kind of cooling water equipment that can supply constant temperature, constant current and constant pressure.
The working principle of the chiller is modified by first injecting a certain amount of water into the water tank inside the machine, cooling the water through the chiller refrigeration system, and then sending the low-temperature cooling water to the equipment to be cooled by the water pump. It rises and then returns to the water tank to achieve the cooling effect.
(1) The cooling water temperature is too high, and the condensation effect is poor. The additional working conditions of the cooling water required by the chiller are 30 ~ 35 ℃, the water temperature is high, and the heat dissipation is poor.
It must lead to high condensing pressure. This phenomenon often occurs at high temperatures. The reason for the high water temperature may be: the cooling tower is defective, such as the fan is not turned on or even rotating, the water distributor does not turn, the cooling water temperature is high and rising rapidly; the outside temperature is high, the waterway is short, and the amount of recyclable water is small In this case, the temperature of the cooling water is generally maintained at a relatively high level, which can be treated by adding a storage tank.
(2) The lack of cooling water flow can not reach the additional water flow. The main performance is that the pressure difference between the inlet and outlet of the unit becomes smaller (compared with the pressure difference at the beginning of the system operation), and the temperature difference becomes larger. The reason for the lack of water flow is the lack of water or air in the system. The treatment method is to install an exhaust valve at a high place in the pipeline for exhausting; the pipeline filter is clogged or selected too thin, and the water permeability is limited. An appropriate filter should be selected and Regularly arrange the filters; the pump selection is small, and it is not compatible with the system.
(3) Fouling or clogging of the condenser. The condensed water is generally tap water, which is easy to scale at temperatures above 30 ° C, and because the cooling tower is open,
Directly exposed to the air, dust and foreign matter easily enter the cooling water system, forming a dirty condenser plug, a small heat exchange area, low efficiency, and also affecting water flow. Its performance is that the pressure difference and temperature difference between the inlet and outlet of the unit become larger, the temperature above and below the condenser is very high, and the copper pipe from the condenser is tricky. The unit should be backwashed regularly and chemically cleaned and descaled if necessary.
(4) Excessive refrigerant charge. This condition generally occurs after repairs, and manifests itself as high intake and exhaust pressures and equilibrium pressures, and high compressor operating currents. Bleed according to the suction and discharge pressure and equilibrium pressure and operating current under extra working conditions until normal.
(5) Non-condensable gases such as air and nitrogen are mixed in the refrigerant. This condition usually occurs after repair, and the vacuum is not complete. Can only be drained,
Vacuum is applied from the beginning and refrigerant is charged from the beginning.
(6) False positives caused by electrical problems. Because the high-voltage maintenance relay is wet, bad contact, or damaged, the unit electronic board is wet or damaged, and communication errors cause false alarms. This kind of false fault, often the HP fault indicator on the electronic board is not lit or dim, manual reset of the high-voltage maintenance relay is invalid,
The computer shows "HPRESET", or disappears voluntarily. It is tested that the compressor running current is normal, and the suction and discharge pressure is also normal.


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