The rapid change of temperature The temperature of the test chamber refrigeration system is designed to remove dirt from the refrigeration system to prevent dirt from entering the compressor and the throttle valve. The sewage discharge method is as follows: 1. Rapid temperature change The equipment piping of the test chamber refrigeration system must be drained before operation to remove the welding slag, iron filings, sand and other dirt remaining in the system during the installation process. Prevent dirt from damaging the components of the chiller and the valves in the system to avoid system blockage. 2. When the ammonia refrigeration system discharges the sewage, the compressed air can be supplied by the air compressor or the ammonia refrigerator. The pressure of the compressed air generally does not exceed 0.6 MPa. The sewage outlet should be set at the lowest point of the pipeline, and the sewage disposal work can be grouped and segmented. 3, rapid temperature changes in the test chamber refrigeration system generally not less than 3 times, until the exhaust gas does not contain water vapor, oil and rust and other debris. 4. In order to effectively utilize the explosive force of the compressed gas and the high-speed airflow, a valve can be installed on the sewage outlet, and the valve is quickly opened when the pressure in the system rises, so that the gas is quickly discharged and the dirt is taken out. 5. In practice, the cork can also be blocked by a cork. When the system has a certain pressure, the cork is unplugged and the air is quickly discharged. This method is very good. However, there is a certain danger. Be careful when handling and pay attention to safety. 6. The discharge of the Freon system is also carried out after the system is installed, and the 0.6 MPa nitrogen is used for the segmental blowdown. The method and test of sewage discharge are the same as the ammonia system. The freon system cannot use compressed air during the sewage discharge and pressure test. The compressed air contains water vapor. If it remains in the Freon system, it will cause ice plugging or ice plugging in the Freon system. 7. In the process of sewage discharge, if there is obvious leakage of the pipe flange valve, it should be remedied in time. After the system is drained, the valve plug and filter of all valves of the system should be removed and cleaned.
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