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Thread: Air pressure switch and transformers

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    Air pressure switch and transformers

    Is there any difference between using one off of a model 22 on a 41?

    thanks for any advice as they appear to be exchangeable.

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    Transformers are the same. Air Pressure switches are different. The switch for the M41 is much bigger and must trip at a different pressure. Tom

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    Quote Originally Posted by hawkins111 View Post
    Transformers are the same. Air Pressure switches are different. The switch for the M41 is much bigger and must trip at a different pressure. Tom
    Thank you Tom, any way to tell a 422 from a 441 or a 22 from a 41 air pressure switch as they can look the same.

    Tom

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    The M441 and M41 air pressure switch is much larger than the 21, 422. I believe the M441 and M41 are round where the M21 and 422 are square and much smaller. Tom

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    Tom

    i have a 22 with the large round air switch like the 41 and also a 441's with both the large and later ones with the smaller square.

    tom

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    The M22 with a large round air switch has an incorrect switch on it. Not saying it does not work, just that it is the wrong part. The M441 can have both a large and a small switch on it. I do not know when the change occurred. My M441 was made in 1996 and it has a small switch. The book has different part numbers for M22 and M41 , and M422 and M441. In all cases I have looked into when Monitor assigned a different part number, the part is different.

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    Quote Originally Posted by hawkins111 View Post
    The M22 with a large round air switch has an incorrect switch on it. Not saying it does not work, just that it is the wrong part. The M441 can have both a large and a small switch on it. I do not know when the change occurred. My M441 was made in 1996 and it has a small switch. The book has different part numbers for M22 and M41 , and M422 and M441. In all cases I have looked into when Monitor assigned a different part number, the part is different.
    Thank you for your response.

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