Muhamad Asrul Affendi Mat Nor, Nurul Syahirah Mohd Nor, and Zulkurnain Hassan, “Automatic Pump Down Air Conditioning System for Refrigerant R22 Split Unit”, Politeknik & Kolej Komuniti Journal of Engineering and Technology, vol. 4, no. 1, pp. 23–30, Nov. 2019, Accessed: Nov. 22, 2024. [Online]. Available: https://app.mypolycc.edu.my/journal/index.php/PMJET/article/view/237