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Thread: Heater Air flow switch setting

  1. 03-28-2017, 06:03 AM #1
    GIRI
    GIRI is offline Regular Guest
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    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
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  3. 03-28-2017, 08:32 PM #2
    WAYNE3298
    WAYNE3298 is offline Professional Member
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    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.
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  4. 09-16-2019, 11:32 PM #3
    bradluke0
    bradluke0 is offline Regular Guest
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    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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