What can be used to pressurize a chiller system before opening the system for a non-major repair?

• A. Cold water
• B. Air pressure
• C. Controlled hot water
• D. Refrigerant gas

Answer: (C)

The correct choice for pressurizing a chiller system before opening it for a non-major repair is controlled hot water. Using controlled hot water can effectively pressurize the system while minimizing the risk of introducing moisture or contaminants, which is crucial for maintaining system integrity.

When preparing to work on refrigeration systems, it is essential to pressurize them to check for leaks and ensure that the system is safe to open. Controlled hot water can be carefully managed to avoid temperature extremes, which might otherwise cause thermal stress on the system components.

In contrast, using air pressure is generally not recommended because it can introduce moisture into the system, potentially leading to corrosion and other issues. Refrigerant gas is inappropriate for this purpose before repairs since it is typically under high pressure and requires specialized handling to avoid environmental harm and safety hazards. Cold water is also not suitable, as it does not provide the necessary pressure and can lead to further issues with system performance or integrity.

By choosing controlled hot water, technicians can appropriately manage the pressure needed for maintenance while reducing risk factors associated with other potential options.