Bosch: The high loop in the drain hose of your dishwasher is to keep water from settling in the hose if it were hanging down any lower or horizontally.Do I line up the top edge of the dishwasher with the edge of the counter Do I line up.Those fins are there for you to secure the DW to the underside of the counter top.Installing a Bosch dishwasher depends on what type of countertop you have over.
The line of holes on the bracket should point away from the dishwasher. ![]() In the photo below, which was featured as a Structure Tech Photo of the Day, there are several plumbing defects, two of which are related to the dishwasher drain. Can you spot them Wrong side of trap Problem number one is that the drain is connected to the sewer side of the trap. The water that always sits in the bottom of the P-trap is what prevents sewer gases from coming in to the house. The dishwasher drain must be connected before the P-trap, not after it, which is what was done here. No high loop In the diagram above, right, youll notice that the dishwasher drain makes a high loop underneath the kitchen sink. ![]() In fact, our plumbing code says as high as possible under the countertop. How Far Back To Mount Bosch Dishwasher Install An AirAn alternative to installing a high loop is to install an air gap at the kitchen sink - its a device that actually mounts above the sink. I cant imagine why anyone would do this if they didnt have to - how ugly. In some parts of the country, these air gaps are required no matter what. Too bad for them. How Far Back To Mount Bosch Dishwasher Manual Still RequiresAlthough new dishwashers come from the manufacturer with the drain looped up at the side of the dishwasher, every installation manual still requires this high loop underneath the sink. Ive heard different reasons for why an additional loop is required under the sink, so I decided to contact the manufacturers directly. I sent out an email to eight dishwasher manufacturers, asking them this question: A high loop is required on the dishwasher drain i n the installation instructions for all of your dishwashers. What is the purpose of this Doesnt the high loop that is incorporated in to the side of the dishwasher achieve the same thing Any insight or commentary in to this matter would be greatly appreciated. Here are the responses I received: Kenmore: The high loop or air gap must be used to prevent potential backflowcontamination of the dishwasher. Local plumbing codes generally dictate the requirements in your area. Section 807.4 of the Uniform Plumbing Code states: No domestic dishwashing machine shall be directly connected to a drainage system or food waste disposer without the use of an approved dishwasher airgap fitting on the discharge side of the dishwashing machine. Listed airgaps shall be installed with the flood level (FL) marking at or above the flood level of the sink or drainboard, whichever is higher, or separately trapped with the airbreak located on the stand pipe. GE: If an air gap is not required, the drain hose must have the high loop from the floor to prevent backflow of water into the dishwasher or water siphoning out during operation.
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