tailieunhanh - Refrigeration and Air Conditioning Equipment Cooling Episode 2

Tham khảo tài liệu 'refrigeration and air conditioning equipment cooling episode 2', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | STARTING RUNNING CAPACITOR Courtesy Carrier Corporation Figure 19. Single-phase wiring diagram for a semihermetic condensing unit. gauge registering low side pressure registers 2 . 4 Stop the compressor and watch the gauge. If the pressure rises pump down again. Repeat the operation until the pressure remains at 2 . 5 Frontseat the compressor discharge and suction shutoff valves. 6 If the compressor is to be left pumped down for any period tag the disconnect switch to prevent accidental starting of the unit. 5. If the compressor is the only component to be removed pumping down the crankcase will be sufficient. This may be done by front-seating the suction shutoff valve and completing steps 1 - 5 listed under pumpdown procedure. 11 You must stop the compressor several times during pump-down to prevent excessive foaming of the oil as the refrigerant boils out since the foaming oil may be pumped from the crankcase. 6. Breaking refrigerant connections. When it becomes necessary to open a charged system the component or line to be removed or opened should be pumped down or evacuated to 2 . You must allow enough time for all adjacent parts to warm to room temperature before you break the connection. This prevents moisture from condensing on the inside of the system. 7. After the component has warmed to room temperature you are ready to break the connection and make the necessary repairs. 8. Cleaning the expansion valve strainer. To clean the expansion valve strainer you must close the liquid line shutoff valve and pump down the system to 2 . Disconnect the valve and plug the tube ends. Remove the screen and clean it with a recommended cleaning solvent. After the screen is clean and dry reinstall it in the valve and connect the valve in the system. Purge the lines and valves then open two turns off the backseat the liquid line shutoff valve. 9. Cleaning suction strainers. Most suction strainers are located in the suction manifold on the .

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