Maintenance
1. Normal maintenance on all conditioners is generally limited to filter changes and fan motor
lubrication. Lubrication of the fan motor should be performed in accordance with the
instruction label on the conditioner. Be sure to use nondetergent electric motor oil.
2. Filter changes are required at regular intervals. The time period between changes will
depend upon the project requirements. Some applications such as motels produce a lot of
lint from carpeting and linen changes, and will require more frequent filter changes. It is
suggested that the filter be checked at 60-day intervals for the first year until experience is
acquired. If light cannot be seen through the filter when held up to sunlight or a bright light, it
should be changed. A more critical standard may be desirable.
3. The condensate drain pan should be checked annually, and cleaned and flushed as
required.
4. Recording of performance measurements of volts, amps, and water temperature differences
(both heating and cooling) is recommended. A comparison of logged data 3 with start-up
and other annual data is useful as an indicator of general equipment condition.
5. Periodic lockouts always are caused by air or water problems. The lockout (shutdown) of
the conditioner is a normal protective result. Check for dirt in the water system, water flow
rates, water temperatures, airflow rates (maybe dirty filter), and air temperatures. If the
lockout occurs in the morning following a return from night setback, entering air below
machine limits may be the cause.
