Polycold PFC-660-HC Fast Cycle Water Vapor Cryochiller. The Polycold Fast Cycle Water Vapor Cryochillers (PFC) effectively captures water vapor, which comprises 65% to 95% of the residual gas in high-vacuum systems. Water vapor is typically the most reactive contaminant present. With the PFC cryochillers, you can expect to increase product throughput in your existing system 20% to 100% and improve quality of deposition. Sold AS IS with no refrigeration charge.