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  1. #1
    Join Date
    Sep 2012
    Location
    Singapore
    Posts
    8
    Post Likes

    Confused Heater Air flow switch setting

    Hi
    We have an electric heater in the AHU and the AHU's air flow capacity varies from 3000 - 7000 cmh.
    My client is asking us for the calculation / selection details. Please advise how to select the air flow switch?
    what will be the default / recommended air flow switch setting?

    Giri

  2. #2
    Join Date
    Feb 2016
    Location
    Louisburg Kansas
    Posts
    3,450
    Post Likes
    Standard electric heater airflow is suggested by every manufacturer that I know of to be 70 cfm per KW. As a permissive on an AHU that should not be a problem. Your flow switch setting should be based on 3,000 cmh.

  3. #3
    Join Date
    Aug 2019
    Location
    Central Florida
    Posts
    71
    Post Likes
    I agree with Wayne. The low limit will be around 70 to
    100 cfm per kw. Sometimes you have to play around with the airfow switch to get it to close .

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