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Method and apparatus for controlling microbial growth on condensation coils

  • US 5,286,447 A
  • Filed: 03/09/1992
  • Issued: 02/15/1994
  • Est. Priority Date: 03/09/1992
  • Status: Expired due to Fees
First Claim
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1. The method for controlling microbial growth on cooling coil apparatus located within an air cooling system, comprising the steps of:

  • providing a system including a first inlet passage having a first flow responsive valve open during primary air flow operation, a second outlet passage having a second flow responsive valve open during primary air flow operation, a chamber interconnecting the first and second passages, disinfectant gas outlet in communication with the chamber adjacent the outlet passage having a flow controlled valve closed during primary air flow operation of the air cooling system, a disinfectant gas circuit having a fan and an outlet in communication with the chamber adjacent the inlet passage, cooling coil apparatus within the chamber and a primary air mover selectively forcing air through the passages, chamber and cooling coil apparatus upon demand for cooled air,energizing the primary air mover during an air cooling cycle during demand for cooled air,timing the duration of the cooling cycle and sensing a first predetermined duration thereof,deenergizing the primary air mover upon sensing of said first predetermined duration to close the valves of the first and second passages sealing the chamber with respect to the first and second passages and opening the disinfectant gas outlet valve,introducing an anti-microbial disinfectant gas into the sealed chamber through the disinfectant gas circuit outlet by energization of the fan to treat the cooling coil apparatus,removing the anti-microbial disinfectant gas from the sealed chamber and air cooling system through the disinfectant gas outlet, andunsealing the chamber with respect to the first and second passages by opening the first and second flow responsive valves by energizing the primary air mover to initiate another first predetermined duration of the cooling cycle.

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