Public transportation runs air conditioners (AC) throughout the day to maintain a comfortable environment, which makes selecting a dependable refrigerant critical. Beyond providing cooling capacity for passenger comfort, bus and rail AC run continuously to maintain lower humidity levels to prevent mold and mildew growth. In addition to meeting these needs, the ideal refrigerant must also be nonflammable to ensure passenger safety.
The bus and rail industry has relied almost universally on freon refrigerants for consistent high performance cooling. While some antiquated systems, such as those using R-12 or R-22, have been retrofitted or replaced to use R-134a, other systems now use:
– freon 407C
– freon MO99
– freon NU-22B™