View Full Version : Dishwasher plumbing
dgsmithis
Oct 4, 2010, 05:21 PM
I currently have my dishwasher installed in my kitchen. I ran the plumbing from a hot water branch located from my basement. Since the dishwasher is not near (or even on the same wall) as my sink I had to run the drainage line to my basement sink which is located directly below the dishwasher (about 8 or 9 feet below). I have looped the drain line at the dishwasher and then ran it through the floor to the sink where it ties in on the verticle before the ptrap. I have noticed that the dishes do not get clean all the time and now the dishwasher will remain locked in a cycle. The repair man said that it could be due to syphoning of the water. How could I resolve this issue?
ballengerb1
Oct 4, 2010, 05:49 PM
Repair man wrong, don't call him again. So you are using a loop for your trap, how small of a circle did you make this loop? What do you mean by locked in a cycle?
hkstroud
Oct 5, 2010, 04:47 AM
I don't know Bob, I think I might disagree. If dgsmiths set up is like this drawing, the drain plumbing would probably cause a siphoning action. If the siphoning from the wash cycle is still going on when the rinse cycle starts, it would pull all (or some) of the rinse water out.
speedball1
Oct 5, 2010, 05:41 AM
I think I agree with Harold on this.
This is the very first time I've ever recommended installing a counter top air gap instead of a high loop but this installation needs a physical gap in the drain to prevent any siphon action from happening.
A counter top air gap,(see image) would solve the siphon problem.
ballengerb1
Oct 5, 2010, 07:15 AM
Without a drawing or something from dg I can't figure this any better. However, a drain line lopped and then dropping 9' to another level to a sink doesn't have much of a chance to siphon back into the washer, in my thinking. If anything the loop trap would get siphoned and we'd be hearing about a sewer smell. How about dg, can you answer my question in post #2 and maybe attach a drawing?
dgsmithis
Oct 7, 2010, 04:52 PM
The drawing above is close, instead of the vent pipe it is entering in the sink cabinet, and it appears that the syphoning is occurring. I have the option of placing a p-trap off my basement sink vent pipe just below my main floor about 10' away.
Where would I get an under counter air gap from? I check home depot but nothing there.