Suction Line Filter Dryer:
- Purpose: Remove debris, moisture, and acid from the system.
- Temporary Use: Designed for cleanup after a compressor burn-out, not to be left in the system permanently.
- Monitoring: Monitor pressure drop (exceeds 2 psi) or temperature drop (exceeds 3°F).
- Replacement: If pressure drop exceeds 2 psi or temperature drop exceeds 3°F, the dryer should be replaced or removed.
- Consequences of Leaving in System:
- Low suction pressure
- Increased compression ratio
- Increased discharge temperatures
- Potential breakdown of the compressor
- Installation: Install and monitor for pressure or temperature drop, remove within three days.
- Location: Between the evaporator and compressor in the suction line.
- Features: Shrader ports for monitoring pressure drop, fiberglass screen, strainers to remove debris, and desiccant to remove moisture and acid.
Sight Glass:
- Location: In the liquid line, preferably after the filter dryer.
- Purpose: Indicate liquid refrigerant flow and ensure a solid column of liquid refrigerant to the metering device.
- Types:
- Plain sight glass: Shows liquid, vapor, or a mixture.
- Sight glass with moisture indicator dye: Shows if moisture is present in the system.
- Moisture Indicator:
- Yellow: Indicates moisture in the system.
- Green: Indicates the system is dry.
- Bubbles in Sight Glass:
- Indicate a lack of refrigerant charge, a leak, low heat load, or a restriction such as a restricted filter dryer.
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