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Emergency Coil Drain
Do not drain the coil as a normal method of freeze protection. Frequent draining promotes
corrosion inside the coil tube. However, draining is acceptable as an emergency method
of freeze protection if the coil is not protected by a glycol solution. If the coil is not
protected, an automatic drain valve and vacuum breaker are recommended to drain the
coil if flow stops or 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
coil falls below 50ºF (10°C). Contact your local BAC Representative for guidelines on the
installation of an emergency coil drain system.
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