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Exhaust vent slope - sealed combustion boiler

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Bob_Engelhardt
Bob_Engelhardt Member Posts: 21
in THE MAIN WALL
I'm installing a Weil McLain CGs boiler (sealed combustion).  The exhaust vent is supposed to slope back to the boiler where a condensate drain is the first horizontal fitting.



It would be REALLY convenient to slope the vent away from the boiler and have the drain just before the exterior wall.  Is there a good reason why I shouldn't do this?



Thanks,

Bob



BTW: the vent is vertical for 4' then horizontal for about 8'.

Comments

  • Henry
    Henry Member Posts: 998
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    Certified I&O manual

    You must follow the certified Installation & Operation manual that comes with the boiler. There are several good reasons for that. The manufacturer has tested and certified the venting. Not following the instructions could lead to loss of warranty, tagging by the OHJ, lawsuits etc...
  • Tim McElwain
    Tim McElwain Member Posts: 4,625
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    Simple answer is

    the condensate will freeze and eventually plug the exhaust.
  • Bob_Engelhardt
    Bob_Engelhardt Member Posts: 21
    edited October 2012
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    Thanks

    "You must follow the certified Installation & Operation manual ..."  Yeah, I knew that ... just hoping for the answer that I wanted  



    I'm still curious as to why it would pitch back, rather than away.  Away seems better - if the drain becomes clogged, "away" would overflow outside, where "back" would go into the boiler.  Also, wind-driven rain would not have to be handled by the drain.



    Thanks,

    Bob
  • Bob_Engelhardt
    Bob_Engelhardt Member Posts: 21
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    Wouldn't freeze because ...

    the drain would be inside, just before the wall.
  • John Mills_5
    John Mills_5 Member Posts: 952
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    It could

    Cold air from outside will come in during the off cycle. If it is done, put the needed trap as low as possible from the vent and maybe the water in the trap won't freeze. 
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