Dishwasher discharge must be anchored to bottom of counter so its above Garbage Disposal dishwasher inlet.

[Aggas]

Dishwasher
Dishwasher discharge line must be run high, anchored to bottom of counter, so it runs above Garbage Disposal and slopes to the garbage disposal's dishwasher inlet. This makes an air gap and keeps sewer gas from going into dishwasher.

Under Counter Ice Machine
Install a Tee (optimum is a WYE Sloped TEE) into the dishwasher inlet of the garbage disposal with the Wye branch facing up and straight flow of the TEE taking straight line flow of dishwasher running into the garbage disposal. Install the Ice Machine Pump discharge line to the WYE/TEE branch (branch on top of tee) with directional slope towards the garbage disposal. If only a straight TEE then use a check valve. AGAIN run the Ice Machine discharge pump line high level ( anchor to underside of counter) such that the line runs above the the garbage disposal inlet. Running the discharge lines above the garbage disposal dishwasher inlet is and ABSOLUTE REQUIREMENT. The discharge lines must slope down to the garbage disposal. Doing this makes for an Air Gap in the discharge lines and it is best that the high point incorporates upside V configuration to make Air Gap that will not be siphoned by flow. Remember dishwasher is high velocity large volume flow whereas ice machine is lower velocity and lesser flow rate. Any plumbers out there please correct this graduate engineer who is using basic fluid dynamics.

If no garbage disposal then a fitting with double WYE TEE fittings can be installed the sink(s) Pee traps. WYE branch connections facing up.

 

[Aggas]

Side note: If you have a garbage disposal and especially if you have a dishwasher feeding into it, make sure you you run the disposal periodically (preferably sometime after dishwasher has finished) and make sure you have the water on feeding into it. This will help save you from clogs and odors. Not to mention not having to call a plumber. Also if you do get a clog, the baking soda and vinegar usually will work but both sink and garbage disposal stoppers must be stopping. Also a bit more costly is a cup of Dove dishwasher soap and vinegar into the drain setting overnight. 25 years and never called a plumber after my wife did while I was in the Middle East.

 

[GReynolds929]

A high loop is not possible to be an air gap no matter how high you put it, it is directly connected to the disposal. You may be able to call it an air break as it drains into the garbage disposal chamber.

 

[Sponsor]

 

[Jeff H Young]

Dont know what Aggas is trying to convey a tutorial or a question but air gaps and high loops arent the same at all though some of the thinking is the same its in hopes to provide sanitary connections ice machine highlooped to a sink drain wye tailpiece is not the same as an airgap and is not an indirect connection . probebly some kinda AI stuff