He plumbed a separate drain line and hot water source behind the space where the dishwasher is to be placed.
Dishwasher drain installation without sink.
Install a properly vented standpipe near the dishwasher and connect the discharge tubing to that follow local plumbing codes.
Go under the floor the last option is to run a drain line under the floor and attach to the sink drain below the floor.
In other words is it possible to hook up the drain of a dishwasher without attaching the drain to the tailpiece of a kitchen sink.
You must vent that trap.
Install horizontal drains with a downward grade of 1 4 per foot.
High loop the dishwasher drain hose and stick it thru the floor and into the standpipe like it was a washing machine hose.
Now that you know the two different draining methods here are the four ways you can hook up your dishwasher.
Dishwasher installation without sink hook up.
I am building a new house and wondering if it would be possible to attach the dishwasher drain directly to a separate 1 5 p trap behind the dishwasher.
The basic principle is simple the vent comes from below the floor and is tied into the drain pipe from the top this allows the waste water to drain normally while fresh air is brought in to protect the trap.
High loop to drain pull as much of the drain hose into the sink cabinet as possible.
Put the trap in the basement below the sink and just have a short standpipe.
The other option is to discharge the dishwasher to its own drain.