Final answer:
When a household refrigerator compressor does not run, it is recommended that low and high side access valves be installed for efficient recovery of refrigerant and to prevent damage to the compressor.
Step-by-step explanation:
The installation of low and high side access valves is recommended when recovering refrigerant from a household refrigerator compressor that does not run. This is because it may be necessary to achieve the required recovery efficiency and enhance the speed of recovery. Without these valves, the refrigerator's compressor may be damaged.