The Optional Freeze Control unit is designed to monitor pressure in the airline. On cold days with high humidity it is possible to get line blockage due to the moisture freezing within the line. When this occurs the Freeze Control will automatically release an alcohol agent (rubbing alcohol) in the line to thaw it.
The Freeze Control allows for aeration in the winter and also keeps excessive pressure from building up in the compressor, possibly causing damage to bearings, etc.
Recommended whenever the windmill is located away from the pond's edge