Respuesta :

Perplexed20

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.

Explanation:

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