Chillers are divided into air-cooled chillers and water […]
Chillers are divided into air-cooled chillers and water-cooled chillers in the industry. The chillers are divided into low temperature chillers and normal temperature chillers in terms of temperature control. The normal temperature is usually controlled within the range of 0 degrees to 35 degrees. The temperature control of the low temperature machine is usually in the range of 0 degrees to minus 100 degrees. It is a water cooling equipment, and a chiller is a cooling water equipment that can provide constant temperature, constant current and constant pressure.
The working principle of the chiller is to first inject a certain amount of water into the water tank in the machine, cool the water through the chiller refrigeration system, and then send the low-temperature cooling water to the equipment to be cooled by the water pump. It is raised and then returned to the water tank to achieve cooling.
Chiller high pressure fault and treatment method:
(1) The cooling water temperature is too high, and the cooling effect is poor. The additional working condition of the cooling water required by the chiller is 3035°C. The high water temperature and poor heat dissipation will inevitably lead to high condensing pressure. This phenomenon often occurs in high temperature seasons.
(2) The cooling water flow is not enough to reach the rated 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 insufficient water flow is the lack of water or the presence of air in the system. The solution is to install an exhaust valve at the height of the pipeline to exhaust.
(3) The condenser is fouled or blocked. Tap water is usually used for condensed water, and it is easy to scale when the temperature is above 30 °C, and because the cooling tower is open and directly exposed to the air, dust and foreign matter can easily enter the cooling water system, causing the condenser to be dirty and blocked.
(4) The refrigerant is charged too much. This situation generally occurs after maintenance, which is manifested as high suction and exhaust pressure and balance pressure, and high compressor operating current. It should be deflated according to the suction and exhaust pressure and balance pressure and operating current under rated operating conditions until it is normal.
(5) The refrigerant is mixed with non-condensable gases such as air and nitrogen. This situation generally occurs after maintenance, and the vacuuming is not complete. It can only be drained, re-evacuated, and recharged with refrigerant.
(6) False alarms caused by electrical faults. Because the high-voltage protection relay is damp, bad contact or damaged, the unit electronic board is damp or damaged, and the communication failure causes false alarms.