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Testing Hoffman A-1 vent

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bob young
bob young Member Posts: 2,177
in THE MAIN WALL
BLOW THROUGH IT UPRIGHT . THEN UPSIDE DOWN. [ IT SHOULD LOCK ]

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  • Jeff_133
    Jeff_133 Member Posts: 36
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    Testing Hoffman A-1 vents

    Is there a way to test a Hoffman A-1 vent for proper functionality, other than installing it in a radiator and waiting for the system to cycle?
  • Jeff_133
    Jeff_133 Member Posts: 36
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    your test

    do you mean it should be locked once you turn it upright again?
  • bob young
    bob young Member Posts: 2,177
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    up=air ----down=none

    Upright you can blow thru it. inverted , the float drops & it closes. can't blow thru it. fairly simple mode
  • Jeff_133
    Jeff_133 Member Posts: 36
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    ok, got it

    not trying to make this more difficult than it is... but... one thing i noticed is i had a Hoffman vent that shut when it warmed up, but then did not cycle on/off during the so-called "drop-away" so the radiator never was getting warm all the way through. i replaced the vent and that seemed to take care of the issue, but I need to test 15 more vents, and was wondering if there was a way to detect this, as it took me time to observe this...
  • bob young
    bob young Member Posts: 2,177
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    start blowing lol

  • Jeff_133
    Jeff_133 Member Posts: 36
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    that's pretty funny

  • lanceL
    lanceL Member Posts: 14
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    testing rad vents

    I haven't done this but, having the same question, was thinking of extending my vent antler with a ball valve bushed to 1/8 to test them. Just my .02 Lance
  • The Boiler Dr.
    The Boiler Dr. Member Posts: 163
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    I install a test station

    at all my boilers to facilitate testing. It is simply amazing how many vents get condemned when the problem is elsewhere.
  • Jeff_133
    Jeff_133 Member Posts: 36
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    interesting...

    where would be the best spot on the boiler to install a test valve?
  • bob young
    bob young Member Posts: 2,177
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    cut a tee into the header

  • The Boiler Dr.
    The Boiler Dr. Member Posts: 163
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    I take mine

    right off the top cross tee on the low water cut off.
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