Final answer:
Service equipment hoses with manual shutoff valves should be closed when not connected to an A/C system, to prevent refrigerant leaks and comply with safety and environmental regulations.
Step-by-step explanation:
When service equipment hoses with manual shutoff valves are not connected to an A/C system, the valves should be in the closed position. This is to ensure that refrigerant does not leak from the service hoses and to maintain the integrity of the HVAC equipment and tools. It is critical for safety and environmental protection reasons that the refrigerant is contained and not released into the atmosphere.
Always refer to the Environmental Protection Agency (EPA) regulations and safety standards when handling refrigerants.Service equipment hoses with manual shutoff valves should be closed when not connected to an A/C system, to prevent refrigerant leaks and comply with safety and environmental regulations.