Need Disposer Installation Advise

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by schwarz633, Dec 12, 2015.

  1. schwarz633

    schwarz633 New Member

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    Oct 25, 2014
    I've been tasked with installing an ISE Evolution Compact disposer in my daughters condo. I'm pretty handy and have done a fair amount of of glueing and sweating pipes, so I know the mechanics of it, just not the code part of it. This is located in the Chicago suburb of Orland Park. I've done some research and read that Illinois code requires two traps and the dishwasher can't discharge into the disposer. I'm not 100% certain that this is correct or not, I read it on the internet. At this point I can put the disposer on either side.

    The fitting coming out the wall is a copper trap adapter, so I'm thinking that I need to remove that and replace it with a female NPT so I can transition to PVC and get a wye on there. Should I go all the way back to the copper elbow and get a female NPT adapter that is male on the sweat side? I figure the closer I get the wye to the wall, the more options I have in the front.

    Any advise will be appreciated.

    DSCF0989.JPG
     
  2. dj2

    dj2 In the Trades

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    California
    Check the code again, what you wrote makes no sense:
    - One trap is enough in my city.
    - The dishwasher discharge goes from the dishwasher up to an airgap and from there to the garbage disposer.

    Now about your set up, from just under the left sink down:
    - Lower the "end piece" (the T )
    - Reverse the trap. The end piece will go to the long side of the trap here.

    Search for a diagram of the correct set up on this site, to see it visually.
     
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  4. schwarz633

    schwarz633 New Member

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    Oct 25, 2014
    I don't know if it makes sense or not, but that's what it says.

    TITLE 77: PUBLIC HEALTH
    CHAPTER I: DEPARTMENT OF PUBLIC HEALTH
    SUBCHAPTER r: WATER AND SEWAGE
    PART 890 ILLINOIS PLUMBING CODE
    SECTION 890.710 FOOD WASTE DISPOSAL UNITS



    Section 890.710 Food Waste Disposal Units



    a) Installation. Food waste disposal units shall be trapped separately from any other fixture or compartment, shall be connected directly to the sanitary drainage system, and shall be properly vented. Dishwashers shall not discharge into food waste disposal units. Units may have either automatic or hand-operated water supply control. (See Section 890.1130(a), (b) and (c).)



    b) Commercial-Type Grinders. Commercial-type food grinders shall be provided with a waste line at least 2 inches in diameter. (See Appendix F: Illustration D.)



    (Source: Amended at 28 Ill. Reg. 4215, effective February 18, 2004)
     
    Last edited by a moderator: Feb 26, 2016
  5. dj2

    dj2 In the Trades

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    Call or visit your local building department, they will tell you what the code says and means, or ask a licensed plumber in your area. Maybe you are looking at a commercial setting.

    Even with two separate traps, one for each sink, they will probably join together down the line.

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    Last edited by a moderator: Aug 3, 2017
  6. Smooky

    Smooky In the Trades

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    North Carolina
    This section is for a Residential type dishwasher......if there is an air gap above the counter top you can connect the dishwashing machine to the food waste grinder. See section d)1.b.

    d) Dishwashing machines. All dishwashing machines shall discharge to the sanitary drain system.
    SPS 382.33(9)(d)1. 1. `Residential type.' The indirect waste piping from a residential-type dishwashing machine shall not exceed a developed length of 10 feet. The indirect waste piping from a residential-type dishwashing machineshall be installed in accordance with one of the following methods:
    SPS 382.33(9)(d)1.a. a. Where an air-gap or air-break is located below the countertop, the indirect waste piping from the dishwashing machine shall discharge to a standpipe. The standpipe shall be at least 1 ½ inches in diameter and shall extend at least 15 inches above the trap weir.
    SPS 382.33(9)(d)1.b. b. Where an air-gap or air-break is located above the countertop, the indirect waste piping from the dishwashing machine shall discharge to local waste piping. The local waste piping shall connect to the kitchen sink branch tailpiece above the trap inlet, the standpipe or to the dishwashing machine connection of a food waste grinder. When the local waste piping discharges to a standpipe, the standpipe shall be at least 1 ½ inches in diameter and shall extend at least 15 inches above the trap weir. Where a hose is used for local waste piping, the developed length shall not exceed 18 inches.

    https://docs.legis.wisconsin.gov/co...ngs_and_environment/380_387/382/III/33/7/b/_1
     
    Last edited: Dec 12, 2015
  7. cacher_chick

    cacher_chick Test, Don't Guess!

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    Smooky, you are posting references to WI plumbing code, and the OP is doing work in IL. The plumbing codes are not the same.
     
  8. Smooky

    Smooky In the Trades

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    Yea, I see that now. I looked at his avitar and it says Wisconsin. Oops.

    Section 890.770 Dishwashing Machines

    a) Domestic Dishwasher (Private Residence). When a domestic dishwashing machine drain line is connected to the house side of a trap from a sink, the drain from the dishwasher shall be carried up to the underside of the spill rim of the sink. Dishwashing machines shall discharge separately into a trap or tail piece of the kitchen sink and shall not connect to the food waste disposal unit.
     
    Last edited: Dec 12, 2015
  9. hj

    hj Moderator & Master Plumber Staff Member

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    If it were I, I would connect it like 99+% of the ones in the country and NOT get an inspection.
     
  10. cacher_chick

    cacher_chick Test, Don't Guess!

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    I agree with HJ. Alternatively, given that the existing tailpiece is long and the trap is on backwards, there might be room to go either way.
     
    Last edited: Dec 13, 2015
  11. schwarz633

    schwarz633 New Member

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    So, one trap or two? I don't plan on getting it inspected, but I am concerned about a home inspector flagging a problem when she goes to sell the condo in the future.
     
  12. hj

    hj Moderator & Master Plumber Staff Member

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    A home inspector has probably NEVER even heard of that "regulation".
     
  13. Smooky

    Smooky In the Trades

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    It is just as easy to do it like they want it , as it is to do it another way. I'd do it like the code requires and be done with it.
    Here are some examples of two traps with the dishwasher drain going to the tailpiece and the other sink has a food waste grinder:
    http://goodmenproject.com/featured-content/common-plumbing-issue-can-diy-tgil/
    http://www.nachi.org/forum/f22/double-trapped-22365/
    http://blogoprono.com/how-to-hook-dishwasher-with-garbage-disposal/dishwasher-with-garbage-disposal-and-dishwasher-installation-with-garbage-disposal-under-kitchen-sink-for-modern-kitchen/
     
  14. schwarz633

    schwarz633 New Member

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    Oct 25, 2014
    After talking with the Orland Park, IL plumbing inspector, here's what I ended up doing. The cleanout didn't work out too well, but I had already bought the double wye and cleanout fittings so I just went with the original plan.

    DSCF1022.JPG DSCF1023.JPG
     
  15. Smooky

    Smooky In the Trades

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    That looks good. Nice job.
     
  16. PMonroe

    PMonroe New Member

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    Very good job! I just had to install mine! Was so much hassle lol..


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    Last edited: Jan 3, 2017
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