Chapter 50, Problem 1RQ

Which of the following is true regarding the refrigerant piping on a rooftop package unit?
A. The discharge and liquid lines must be field installed.
B. The suction and liquid lines must be field installed.
C. The discharge and suction lines must be field installed.
D. No refrigerant lines are field installed.

To determine

The true statement regarding the refrigerant piping in a rooftop package unit.

Answer to Problem 1RQ

The true statement regarding the refrigerant piping in a rooftop package unit is No refrigerant lines are field installed.

Explanation of Solution

The rooftop package unit refers to a single housing which consist all the major components of the system. This package unit is assembled in the factory and charged in the factory. This unit is a complete package of the entire essential component required for the refrigeration or heat pump. It consists

1. Condensers.
2. Compressors.
3. Metering devices.
4. Evaporators.

These components are installed in the same cabin which is called rooftop package unit. Hence, there is no need for any refrigerant line. Therefore, after the installation of the entire component in a single unit there is no requirement to install the refrigeration line in the system. Hence, the fourth statement (no refrigerant lines are field installed) is true about the refrigerant piping in a rooftop package unit.

Conclusion:

The true statement regarding the refrigerant piping in a rooftop package unit is No refrigerant lines are field installed.