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116 UNT-IOM-6
Listed below are the recommended maintenance schedules. Instruc-
tions for specific maintenance procedures are given in the sections
following the checklist.
WARNING: Allow rotating fan to stop before
servicing equipment. Failure to do so may cause severe
personal injury or death.
Monthly
1. Inspect the unit air filters. Clean or replace dirty filters.
Note: Building conditions may require filter change more or less
frequently.
2. Check the main and auxiliary drain pans on fan-coil units to be
sure the pans are clean and do not impede the condensate flow
through the drain line.
Yearly
1. Inspect the unit cabinetry for chips or corrosion. Clean or repair to
provide unit protection.
2. Inspect the fan wheel and housing for damage. Rotate the fan
wheel manually to be sure movement is not blocked by obstructions.
3. Inspect the coil fins for excessive dirt or damage. Remove dirt and
straighten fins.
4. Clean and tighten all electrical connections.
5. Inspect the strainer option for debris trapped in the filter screen.
Change or clean air filters at least twice a year. Filters require more
frequent care under high load or dirty air conditions since a clogged
filter reduces airflow. Table 37 on page 89 lists filter sizes for units.
Throwaway and pleated media filters are available for all units. Follow
the instructions below to replace the disposable filters.
1. All models except vertical cabinets
Remove the front panel of the vertical recessed unit and open the
bottom panel door of the horizontal cabinet and horizontal recessed
unit to access the filter. The front panel of the vertical cabinet unit
does not require removal to change the filter.
Maintenance
Periodic
Maintenance
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Maintenance
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Filters