3. How to protect heating system against freezing?

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In the case we don’t want to or we cannot use heating system during entire heating period and we don’t want to temper this system because of economical reasons it is necessary to fill this system with cooling mixture. There are cooling mixtures intended for this purposes, e.g. Alycol Termo, Fridex EKO, Flamix Termo, etc. Use expansion vessel for simple filling of open system with these substances. Closed systems can be filled after partial or full discharge of circuit, e.g. through the highest point (automatic bleeding valve or directly to the heating element). It is critical to observe prescribed water-cooling mixture ratio and to leave circuit pump in operation for sufficient period to provide perfect mixing.

Frozen radiator (PDF, 264 kB)

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