Some refrigeration systems have chemical moisture indicators installed in conjunction with the sight glass in the liquid line. If excess moisture is present in the system, how will a typical moisture indicator respond?
• Function of a moisture indicator in a refrigeration system • What a sight glass is used for in the liquid line • Difference between indicating a problem and correcting a problem automatically
• Think about whether a small device in the sight glass is more likely to simply show a condition or to actively change system operation. • Review what typical moisture indicators look like and how a technician reads them during system checks. • Ask yourself which options describe an "indicator" versus a control or protection device.
• Confirm that a moisture indicator is primarily a monitoring/diagnostic device, not a control device. • Decide which choices would require complex mechanical or electrical connections to the system, and which would be passive. • Recall that many indicators have a visual reference chart (often on or near the unit) to compare a normal condition to an abnormal condition.
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