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  1. #1
    Join Date
    Feb 2008
    Location
    The Socialist Republic Of California
    Posts
    111

    Confused Twinned Carrier Issue

    Ive got two Carrier Furnaces Model 58tx155---11120 twinned together and having an issue with the blower relay on the primary unit chattering. The only thing that gets it to stop is pulling the wire that connects the two units. Both work perfectly fine individually but when connected together I have the afore mentioned issue . Figuring it was the primary units control board I replaced it but the problem is still there.Spent most of the day today getting beat up by this problem today an help would be appreciated. Thanks
    Salad Isn't food, It's what food eats.

  2. #2
    Join Date
    Nov 2002
    Location
    amherstburg ontario
    Posts
    135
    Are they twinned using a factory kit or are they twinned using field installed isolation relays?

  3. #3
    Join Date
    May 2005
    Location
    smyrna ,georgia
    Posts
    34
    i had the same problem,,you have to make sure the 115 volt line feeding
    the furnace is pulled off the same leg or side of the power panel to the house or space,,( that means two seperate feeds off the same bus of the panel) you cannot have one 115 volt line coming in and split it for both furnaces,,it wont work.also make sure equipment grounds are installed.

    later jay
    better to be thought a fool than to open ones mouth and confirm it

  4. #4
    Join Date
    Feb 2008
    Location
    The Socialist Republic Of California
    Posts
    111
    Was thinking along those lines but wasn't sure if it made a difference. The school recently had a major electrical upgrade all new main switch gear and panel, ect. Originally was single phase but now its 3 phase. The units are twinned using isolation relays.
    Salad Isn't food, It's what food eats.

  5. #5
    Join Date
    May 2005
    Location
    smyrna ,georgia
    Posts
    34
    pull the cover off the panel and make sure your coming off the same buss or leg
    that will remedy the problem
    better to be thought a fool than to open ones mouth and confirm it

  6. #6
    Join Date
    Jan 2005
    Location
    Area 51
    Posts
    984
    http://www.johnsoncontrols.com/publi..._controls.html


    I have used these twinning kits and never had any trouble
    "Paddle faster, I hear banjo music"

  7. #7
    Join Date
    May 2005
    Location
    smyrna ,georgia
    Posts
    34
    johnson controls is the way to go if you can afford it,,
    $600.00 here,,,but the twinning features in most of the white rodgers boards
    will work as long as they are wired from the same bus of the panel and are identically the same
    better to be thought a fool than to open ones mouth and confirm it

  8. #8
    Join Date
    Feb 2008
    Location
    The Socialist Republic Of California
    Posts
    111
    Quote Originally Posted by jay688 View Post
    pull the cover off the panel and make sure your coming off the same buss or leg
    that will remedy the problem
    That was it, Thanks a million.
    Salad Isn't food, It's what food eats.

  9. #9
    Join Date
    May 2005
    Location
    smyrna ,georgia
    Posts
    34
    anytime,,
    scratched my head on it a couple of hours before i figured it out myself


    he -he

    later jay
    better to be thought a fool than to open ones mouth and confirm it

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