ESCO Air Conditioning Practice Exam

Where is a sight glass typically located in an air conditioning system?

1. Before the compressor in the discharge line

2. In the liquid line before the metering device

3. In the suction line before the evaporator

4. Near the oil separator in the discharge line

The correct answer is: Before the compressor in the discharge line

A sight glass is typically located before the compressor in the discharge line. This is because the discharge line is where the refrigerant is compressed and becomes a liquid. The sight glass lets the technician see if there are any air bubbles or contaminants in the refrigerant before it enters the compressor. Option B is incorrect because the liquid line is after the compressor and therefore, the refrigerant is already in a liquid state. Option C is incorrect because the suction line is before the compressor and therefore, the refrigerant is still in a gaseous state. Option D is incorrect because the oil separator is located in the discharge line, not near it, and the sight glass should be placed before the compressor to catch any issues with the refrigerant before entering the compressor.