What method can be used to pressurize an R-1233ZD system for non-major repairs?

The method of warming the liquid refrigerant in the system is viable for pressurizing an R-1233ZD system for non-major repairs. By increasing the temperature of the refrigerant, its pressure will also increase due to the direct relationship between temperature and pressure defined by the ideal gas law. This allows a technician to safely and effectively create the necessary pressure to test the system or perform minor repairs without needing to introduce additional substances or create a vacuum.

In contrast, pumping out air from the system might remove contaminants but would not pressurize the system. Injecting high-pressure nitrogen is often used to diagnose leaks or to perform system charging, but this reference is not applicable for simple pressurization during non-major repairs without appropriate context or specific considerations for nitrogen use. Using a vacuum pump serves to remove moisture and air from the system, preparing it for refrigerant, but does not pressurize the system. Understanding these distinctions is essential for effective maintenance and repair of refrigerant systems.