Final answer:
The given statement ''when recording refrigerant pressure you should only take refrigerant pressure readings when the compressor is engaged. '' is false. Therefore, the correct option is b.
Step-by-step explanation:
Refrigerant pressure readings can be taken both when the compressor is engaged and when it's not. When the compressor is off, the pressure readings represent the static pressure in the system, providing valuable information about its condition at rest.
On the other hand, taking readings when the compressor is engaged gives insight into the dynamic conditions and performance of the system under operation. Both scenarios contribute to a comprehensive understanding of the refrigeration system's health and functionality.
It's crucial to consider both static and dynamic pressure readings to diagnose potential issues accurately and ensure optimal system performance. Additionally, measuring pressure under different operating conditions helps technicians make informed decisions regarding refrigerant charge, system efficiency, and overall functionality.
Therefore, the assertion that refrigerant pressure readings should only be taken when the compressor is engaged is false, as both static and dynamic readings play essential roles in assessing and maintaining the health of a refrigeration system.
Therefore, the correct option is b.