泄水管要求有防冻保护措施。

Drain piping may require to be protected against freezing.

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AF阀门被建议用于非常气候下的防冻保护，产品由两种电缆控制。

The AF valve, which is recommended for freeze protection in extreme climates, is actuated by two conditions.

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去年冬天，在欧洲寒冷地区冬季极端的天气环境下，真空管集热器的热管出现了重大的结冻问题，此问题出现后，真空管集热器和防冻保护重新成为了关注的重点。

Tubular solar collectors and freeze protection has come back into focus after significant failures of heat pipes in the colder parts of Europe during extreme winter conditions.

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