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Emergency Coil Drain
Do not drain the coils as a regular method of freeze protection. Frequent draining promotes corrosion inside the coil tubes.
However, draining is acceptable as an emergency method of freeze protection if the coils are not protected by a glycol solution.
If the coils are not protected by a glycol solution, automatic drain valves and vacuum breakers are recommended to drain the
coils if flow stops or if the fluid temperature drops below 50°F (10°C) when the ambient temperature is below freezing. Further
protection against coil freeze-up is possible with the installation of an alarm to alert personnel when the temperature of the fluid
leaving the coils falls below 50°F (10°C). Contact your BAC Representative for guidelines on the installation of an emergency
coil drain system.
Pre-Cooler Freeze Protection
The integrated controls are set to a default cold weather threshold temperature of 38°F (3.4°C). When the outside air
temperature falls below the cold weather threshold temperature, the unit will automatically transition into dry mode of operation
and the sump drain valve will open. The control panel will automatically disable adiabatic operation when the outside air
temperature is below the cold weather threshold temperature.
Protection of Electrical Components
To protect the electrical components from cold weather, the electrical panel is equipped with a heater to prevent the
temperature inside the panel from dropping below 40°F (4.4°C).
TrilliumSeries™ Adiabatic Cooler - TRF Operation & Maintenance Manual – Cold Weather Operation
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