Moisture indicators are normally part of which component?

• A. Sightglass
• B. Low-pressure switch
• C. Receiver
• D. Condenser coil

Answer: (A)

Moisture indicators are normally part of the sight glass. The sight glass is placed in the liquid line so you can watch the flow of refrigerant and, in many designs, there’s a moisture indicator built into or adjacent to it. This indicator changes color when moisture is present in the refrigerant, signaling the technician that the system needs to be dehydrated or evacuated before charging. The other components serve different roles: a low-pressure switch monitors evaporator pressure to protect the compressor, a receiver stores liquid refrigerant, and a condenser coil rejects heat. None of those provide a moisture reading, so the moisture indicator is typically associated with the sight glass.