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What device may be used to ensure that air is flowing through a duct before an electric strip is energized
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What device may be used to ensure that air is flowing through a duct before an electric strip is energized

User Chris Graham
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6 votes

Answer:

Most commonly used air flow proving interlocks are:

  • differential pressure air flow switch. Contact changes state based on duct static vs. atmosphere outside the duct or dp across a fan inlet to outlet
  • CT relay. Current transformer relay that changes state from 0 to 1 open/closed when amp draw on a blower motor exceeds the trip setpoint.

Step-by-step explanation:

User Ben Alan
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