How to prepare absorption unit (Li-Br water) for cooling during winter (20ºF ambient temperature). Absortption unit will be used for laboratory cooling with permanent heat gain. Absorption unit has cooling tower without three-way valve, but a cooling tower fan has inverter. I think two problems will occur cooling water freezing (in case of low capacity) and Li-Br solution crystallization (in case of high capacity and cooling water temperature bellow 65ºF).
Any suggestion?

Regards Igor!