Routine Maintenance
caution
Use caution when removing access panels or other unit components, especially while standing on a ladder or other potentially unsteady base. Access panels and unit components can be heavy and serious injury may occur.
Once the unit has been put into operation, a routine maintenance program should be set up to preserve reliability and performance. Items to be included in this program are:
•Internal Filter
Check for cleanliness. Replace if required.
•Door Seal
Check if intact and pliable.
•Coil Maintenance
Check for cleanliness (coil and drain pan).
•Winterizing Coils
Drain. Fill with antifreeze. Drain.
Coil Maintenance:
Cleaning
Coils should be kept clean to maintain maximum performance. For operation at its highest efficiency, the coil should be cleaned often during periods
of high cooling demand or when dirty conditions prevail. Power should be disconnected and locked out and motors should be covered to insure that no moisture penetrates into the windings causing motor failure if applicable. Remove large debris from the coils and straighten fins before cleaning. Clean coils with cold water and detergent or with one of the commercially available chemical coil cleaners. Rinse coils thoroughly after cleaning. For coils with fragile fins or high fin density, foaming chemical sprays and washes air available. Many coil cleaners contain harsh chemicals, so they must be used with caution by qualified personnel only. Care must be taken not to damage the coils. FINS ARE SHARP! Use caution when working with coils.
caution
Do not use acidic chemical coil cleaners. Do not use alkaline chemical coil cleaners that, after mixing, have a ph value greater than 8.5 without also using an aluminum corrosion inhibitor in the cleaning solution. Failure to follow these guidelines or the manufacturer’s instructions for use of cleaning chemicals could result in damage to the unit.
Fin Straightening
Coil fins may have been bent during shipping or servicing, and should be straightened to maintain maximum heat transfer. Reduction of the effective coil surface will correspondingly reduce coil capacity. Always check fin appearance after any handling of the coil and after any servicing is done near the coils. Fin combs are sized according to number of fins per inch of the coil. For relatively small bends that require only minor repair, other tools may be used to evenly space the fins. Be careful not to damage the coils.
Winterizing Coils
During any extended down time, all water should be drained from the coil. The coil should then be thoroughly flushed with a glycol solution to prevent freeze damage.
Filters
Filters upstream of the coil should be checked regularly for dirtiness and clogging. If the filters are dirty, they should be replaced. It is important that the coils stay clean to maintain maximum heat transfer capability.
Drain Pan
Drain pans may contain moisture; therefore, algae and other organisms will grow due to airborne spores and bacteria. Scheduled cleaning is necessary to prevent
WARNING
Biological Hazard! All drain pans and coils should be cleaned on a regular schedule by qualified personnel to prevent the growth of bacteria.
Vektor