Thread Number: 82113  /  Tag: Modern Dishwashers
Replacing dishwasher question about drain connections
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Post# 1061357   2/23/2020 at 15:51 (1,494 days old) by dylanmitchell (Southern California)        

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Replacing a Badger 5 prior owners installed with an Evolution Compact. With only two people who don't cook a lot, it will see moderate use.

Looking for help understanding the drain connections. I see where the dishwasher and sink are connected to the air gap by the sink faucet. The extra line is running to a sink sprayer. I also see the disposer drain but don't see a drain hose from the dishwasher to disposal. The dishwasher will back up into the sink and I don't see a separate standpipe. Any idea where the dishwasher drain is going and how it's connected so it overflows into the sink? The powercord under the sink goes into the reeptacle that's connected to a wall outlet so no wiring challenges.

Also, beyond replacing the disposal are there any hoses or pipes I should replace while work is being done? Like to be proactive and replace things before they become a problem.


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Post# 1061370 , Reply# 1   2/23/2020 at 17:44 (1,494 days old) by marky_mark (From Liverpool. Now living in Palm Springs and Dublin)        

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Your dishwasher is connected to the air gap.  Then the air gap is connected to the disposal.  There is no connection from the dishwasher direct to the disposal or any drain.

 

So the waste water from the dishwasher runs up to the air gap and then continues on down to the disposal, having passed through the air gap.


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Post# 1061372 , Reply# 2   2/23/2020 at 17:46 (1,494 days old) by combo52 (50 Year Repair Tech Beltsville,Md)        
Air-Gap Backing Up

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Did you knock the plug out of the DW port on the new disposer before you connected the air-gap drain hose to it ?

 

John L.


Post# 1061374 , Reply# 3   2/23/2020 at 18:06 (1,494 days old) by marky_mark (From Liverpool. Now living in Palm Springs and Dublin)        

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Ah ok.  I interpreted what you wrote in a different way to John!  When you said that "the dishwasher will back up into the sink" I thought you were just saying what you expect will happen with this arrangement.  But did you mean that you have tested it and found that the dishwasher is "backing up" into the sink by draining out of the air gap and pouring into the sink?  If so, then yes I would check that you remembered to knock out the little plastic plug on the new disposal's dishwasher inlet.

 

 


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Post# 1061418 , Reply# 4   2/24/2020 at 16:47 (1,493 days old) by dylanmitchell (Southern California)        
Diposer arrives this week, preparing for install

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Thanks. Disposer is arriving this week and I wanted to make sure I understood the connections before installing. To clarify waster from the dishwasher only backs up into the sink occasionally and running the disposer clears the backup. I also have the air gap pointed toward the sink.

Makes sense that the dishwasher passes throught the air gap then into the disposer. I'll make sure to knock out the plastic plug. I've read that's a common source of issues.



Post# 1061447 , Reply# 5   2/24/2020 at 19:01 (1,493 days old) by combo52 (50 Year Repair Tech Beltsville,Md)        

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Hi Matthew

 

If the sink drain is backing up when the DW drains you have a seriously restricted drain line that should be cleaned or replaced before you can use your disposer much if at all.

 

A kitchen sink drain should handle around 20 gallons of water a minute, a typical DW only drains at a rate of around 1 gallon a minute.

 

John L.


Post# 1061671 , Reply# 6   2/27/2020 at 14:55 (1,490 days old) by dylanmitchell (Southern California)        
Scheduled plumber to check line and install

dylanmitchell's profile picture
Have a plumber coming on Monday that can clean or replace the line and install the disposer. I appreciate the help and like understanding how things work even if we end up having a professional like a plumber do the work.


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