Dirt build-up should be periodically removed especially
from heat transfer surfaces, particularly the condenser
coils of air-cooled condensers. Filters should be
cleaned or replaced regularly rather than waiting for
them to appear so dirty as to need cleaning. Dirty filters
increase fan horsepower while reducing airflow. If routine
and preventative maintenance has not been performed
on the system, complete the required maintenance
before proceeding to determine other applicable
ECO’s.