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  1. #1
    Join Date
    Jun 2003
    Location
    Chicago, IL
    Posts
    4,567
    I while back our company got a request to install 2 furnaces at a remodel. At the time we were too busy and had to turn the work away. more recently we were asked to install a high efficiency water heater at the same house. While installing the water heater i saw something that concerned me

    there are two rheem 90% furnaces. they each are vented with 2 inch pipe, but halfway accross the ceiling a Y fitting was used to combine the two pipes into one 3 inch pipe. this pipe has a couple elbows and about 10 feet of pipe and then exits the house. on the outside of the house it was an elbow pointing down whitch ends about 2 inches above the ground.

    Does any manufacture allow common venting on 90% models? these work fine, but im concerned about exaust from one unit backing up through the other when only one is running. since these take their combustion air from the basement, any gasses that back up would escape into the house.

    should we recommend to the home owner that all of the venting be redone so each furnace is vented individually? obviosly if its a problem it should be fixed by the installing company, but judging by the rest of the work they look like hacks, so i doubt they will be coming back

  2. #2
    Join Date
    Jul 2001
    Posts
    3,112
    Make the incorrect installation known to the owner. Offer to correct for them.

  3. #3
    Join Date
    May 2004
    Location
    Rapid City, SD
    Posts
    7,415
    Doesn't sound like there's enough clearance from the termination of the pipe either.

    Like said above, let them know about it. Either way document it on your ticket and log book to cya.

  4. #4
    Join Date
    Nov 2000
    Location
    Eastern PA
    Posts
    68,981
    There is no condensing furnace on the market that I know of that does not require an independant vent.
    Government is a disease...
    ...masquerading as its own cure…
    Ecclesiastes 10:2 NIV


  5. #5
    Separate.

  6. #6
    Join Date
    Apr 2004
    Location
    Bartlett, IL
    Posts
    6,619
    Sounds to me like you have a sale.

    There's no way both systems are operating together that way, if they are...Holy Sh$T !!!

  7. #7
    Join Date
    Jul 2001
    Posts
    3,112
    Craig1, referrence pages 17 and 20 of the Rheem/Rudd installation manual under vent pipe installation: "Do not common vent with any other appliance." This aplies to both Direct Vent and Non-Direct Vent applications. Can't be much clearer than that.

  8. #8
    Join Date
    May 2000
    Location
    Indianapolis, IN, USA
    Posts
    34,607
    Got a digital camera? That should be good for the Wall of Shame!

  9. #9
    Join Date
    Nov 2000
    Location
    Eastern PA
    Posts
    68,981
    A few years back there was a contractor that was cutting corners by tapping the flue vent into the vent stack for the plumbing. The furnaces worked fine with this setup until the jackass mistook a live sewer pipe for a vent line.

    Yes; that was a ****ty furnace
    Government is a disease...
    ...masquerading as its own cure…
    Ecclesiastes 10:2 NIV


  10. #10
    That is just wrong. Some body was playing engineer and blew it.
    No common venting on 90%ers PERIOD.

    Put two seperate exhaust systems in and add risers to them to get it above snow level.

  11. #11
    Join Date
    Jul 2001
    Location
    Raleigh NC
    Posts
    146

    Robo

    Robo, I emailed you concerning a Goodman CLQ/AEPT Heat Pump Install. Did you get my email? Thanks, Bill in NC

  12. #12
    Join Date
    Nov 2000
    Location
    Eastern PA
    Posts
    68,981
    Got it and responded.
    Government is a disease...
    ...masquerading as its own cure…
    Ecclesiastes 10:2 NIV


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