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Heike, The frost protection functions as a bypass. The unit should be sending air around the heat recovery core (directly to outside ) to maintain the minimum outlet temperature. So you should end up with a lower effectiveness compared to whatever you set. -Cramer --
Cramer Silkworth 212 219 2255 | silkworth@transsolar.com Transsolar Inc. | 134 Spring Street Suite 601 | New York, NY 10012 Transsolar Climate Engineering Technical consulting for energy efficiency and environmental quality in buildings. New York - Stuttgart - Munich |