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Self-Clean Cycle
The TrilliumSeries™ Adiabatic Product Self-Clean Cycle was developed to help maintain
maximum operational performance of the unit by reducing the amount of accumulation of
debris on the coils and the Pre-Cooler Pads. The Self-Clean Cycle is not intended to replace
regular maintenance. Please follow the regular maintenance schedule as indicated in this
manual to ensure proper operation.
Special Considerations
The unit capacity will be affected during the Self-Clean Cycle. The amount of air passing
through the coils will be lower than in normal operation, and BAC recommends enabling this
feature during low load periods of the day. The unit comes preset to operate the Self-Clean
Cycle at 5:45 am for three minutes. If you would like to set a different time or duration, refer
to page 41. Also note, the Self-Clean Cycle is automatically disabled below 40°F (4°C).
Operation
The Self-Clean Cycle allows the fans to rotate backwards for a set amount of time. By pushing
the air in the opposite direction of normal operation, most debris accumulated on the outer
areas of the coils and pads get “pushed” out minimizing accumulation. This feature is active
once a day, every day. Refer to page 41 for additional information.
Winter Operation
When the unit is in Dry Mode, the unit completely drains with no standing water. During winter
operation, the EcoFlex™ Controls automatically disables Pre-Cooler Mode when the ambient
temperature is below 40°F (4.4°C). Turn off the water to the unit and drain all exposed
external piping, including pump piping, when below freezing temperatures are expected.
• Customers in climates that reach below freezing temperatures should take necessary
precaution to protect the water pipes from freezing. This may include installing a valve to
prevent standing water in the pipes (provided by others). Heat trace all exposed make-up
water lines if the water cannot be shutoff and/or external piping cannot be drained.
Figure 24. Self-Clean Cycle
Coil Freeze Protection (TSDF2 Only)
For protection against coil freeze-up, recommended coil fluid solutions are an industrial grade
inhibited ethylene glycol or propylene glycol solution. When the use of glycol is not practical,
the system must be designed to meet the minimum temperature requirements.
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