Red Seal Plumbing Practice Exam

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Thermally operated dampers are designed to close if the bimetal fails.

  1. True

  2. False

The correct answer is: False

Thermally operated dampers are designed to open when exposed to heat and close when there is no heat. This is done through the use of a bimetal, which is a strip of two different metals with different thermal expansion rates. As temperature increases, the metals expand causing the damper to open. However, in the event of bimetal failure, the dampers could either remain open or closed, depending on the position they were in when the failure occurred. Therefore, it is false that thermally operated dampers are designed to close if the bimetal fails.

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