Legionella Health & Safety

Warning! Evaporative coolers must be installed, operated and maintained in accordance with this manual. Failure to do so could result in contamination that might cause Legionnaires’ disease, which can be fatal.

Your attention is drawn to the Health and Safety Executive’s Approved Code of Practice (ACOP) and their technical guidance on the prevention and control of legionellosis in water systems. If inadequately maintained, water systems, of which any humidifier is a part, can support the growth of micro-organisms including the bacterium that causes Legionnaires’ disease. Evaporative cooler manufacturers have considered all aspects of the design of their humidification systems to reduce as far as possible the risk of Legionnaires’ disease and other similar conditions but it is important that users are also aware of their responsibilities under the ACOP in reducing the risk of legionellosis.

To prevent the growth of legionella, users are required to:

  • Carry out a risk assessment of the water system by a competent person, and implement a monitoring and control regime.
  • Avoid water temperatures that favour the growth of legionella (20-45°C);
  • Avoid water stagnation;
  • Clean and disinfect the humidification system in accordance with the ACOP and enclosed instructions;

NEVER leave your Evaporative cooler out of operation containing water for more than 24hrs, as it could result in contamination that might cause Legionnaires’ disease, which can be fatal. In the event that the Evaporative cooler is turned off for prolonged periods, ensure that the water reservoir and pipe-work supplying the unit are drained, unless they supply other systems which ensure a regular renewal of water in the system. If the unit is found to have been out of operation for more than 24hrs containing water, water stagnation and contamination may occur, and the system will require thorough cleaning.

If you intend to shut the system down for any length of time please contact CAS Hire

The Evaporative cooler is only intended for light commercial / industrial direct air cooling / humidification and any other or further application is not considered use for the intended purpose. The manufacturer cannot be made liable for any damage resulting from incorrect use.

The Evaporative coolers are designed to be used with mains or softened water. On no account attempt to introduce any other fluid or chemical into the system without first consulting CAS-Hire

Water supply installation must comply with local regulations.

The water supply to the Evaporative coolers should be free of microbial contamination and should run at less than 20 C within 2 minutes of turning on supply. Our policy is one of continuous research and development. We therefore reserve the right to amend without notice the specifications given in this document.

Maintenance Frequency

Frequent cleaning is necessary to maximise and extend the life of the Evaporative cooler.

To refresh the system, every month, place 1 small Disifin tablet into the water tank and allow to dissolve.

Disifin tablets are available from CAS Hire 0800 525082.

Always disconnect the unit from the power socket before cleaning and maintenance.

Regular inspections MUST be carried out by the user to ensure the unit is operating correctly.

The following represent an inspection regime that may be adopted or adapted according to the individual circumstances.

  1. Visually check system for leaks
  2. Visually check water level.
  3. Check the Evaporative pads and water is being pumped into filter media when in operation.