Jump to content

gurgle in furnace condensate line


Recommended Posts

While inspecting a direct vent HE furnace today, there was a gurgling sound coming from the air gap at the condensate discharge line.

I went outside and and checked the vent and intake pipes. It felt like there was way more exhaust being blown out the discharge than air being sucked into the intake.

What is happening here? I've never heard the condensate line gurgle like that. I assume that the draft fan is pulling air in through the condensate line. If so, why would this happen and what are the implications of it?

Link to post
Share on other sites

If the furnace has just been started there may not be enough condensate built up in the furnace condensate trap to be effective. Pour some water into the trap and it should stop. the Manufacturers recommend this when we start up a furnace.

Possible the trap has a crack in it that allows the water to seep out and again cause an ineffective trap for the condensate . The combustion vent blower pulls a negative pressure on the trap so there is little chance of flue gasses excaping. It can throw off the gas air mix to the burners however.

Link to post
Share on other sites

If the furnace has just been started there may not be enough condensate built up in the furnace condensate trap to be effective. Pour some water into the trap and it should stop. the Manufacturers recommend this when we start up a furnace.

Possible the trap has a crack in it that allows the water to seep out and again cause an ineffective trap for the condensate . The combustion vent blower pulls a negative pressure on the trap so there is little chance of flue gasses excaping. It can throw off the gas air mix to the burners however.

Or it could be a cheezy running trap without enough depth.

Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

×
×
  • Create New...