ambient fans should be installed when running a chiller in a high ambient
environment. This is typically an environment over 35°C. These fans can run
at double the motor speed, from 1250RPM to 2500RPM. There are fan speed
controllers to overcome any issues with low ambient temperatures, such as at
night for example.
The noise created by the high ambient fan speed can be mitigated with the
addition of a fan speed controller pack.
This option is not available for K9 and K12 chillers as they have high fan
speed as standard. A high ambient variant of the K9 is available.