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-   -   Dishwasher water supply line too small? (http://www.diychatroom.com/f7/dishwasher-water-supply-line-too-small-114527/)

porpoise1877 08-18-2011 05:57 PM

Dishwasher water supply line too small?
 
I recently had a GE dishwasher installed by a plumber and afterwards was reading the installation instructions. In the instruction manual it says not to use a water supply line that is smaller than 3/8". The plumber used 1/4"; now i am concerned that there is going to be a problem. Does anyone know if using a smaller water line is going to cause problems with the durability, function or performance of the dishwasher?

AllanJ 08-18-2011 06:04 PM

It is possible that the dishwasher won't fill fast enough for proper washing action. Use a clock or watch with a second hand and listen as a cycle goes through. Write down the length of time water is entering, length of time washing action is going on, and length of time the water is drained out. Typically it needs 5 minutes for washing and 2 minutes for rinsing. Usually there are two wash cycles followed by two or three rinse cycles.

If fill time is more than half of the combined fill plus wash time then you probably ahve a too slow fill problem.

Check the dishes for films or residues at the end of the cycle.

oh'mike 08-18-2011 07:17 PM

Take a picture of that please-----I can't imagine a plumber using 1/4" line--I must see that to believe it.----Mike---

porpoise1877 08-18-2011 08:54 PM

maybe plumbing standards are different between the US and Canada? When I went to Home Depot to purchase a 90 degree dishwasher supply line connection they were all 3/8" to 1/4" connections - which would imply to me that using 1/4" for water supply is fairly standard.

oh'mike 08-18-2011 09:00 PM

Sorry--all I've ever seen are 1/2"x3/8" or 1/2" x1/2"----Must be something new---

readar 08-18-2011 10:07 PM

All the dishwashers I've seen have a floating water level sensor. It shouldn't matter how long it takes, it will reach the fill level eventually.

VIPlumber 08-18-2011 11:17 PM

Quote:

maybe plumbing standards are different between the US and Canada?
Nope. Our market is much too small to differ from our US cousins.

Big box = junk. There's a MUCH better selection and variety at plumbing supply houses.

porpoise1877 08-18-2011 11:17 PM

readar - that makes perfect sense, but I wonder why GE would stipulate no smaller than 3/8"

porpoise1877 08-18-2011 11:19 PM

VIPlumber - fair enough, I just wonder why the plumber would have run 1/4", unless it was a norm.

COLDIRON 08-19-2011 08:10 AM

Quote:

Originally Posted by VIPlumber (Post 710522)
Nope. Our market is much too small to differ from our US cousins.

Big box = junk. There's a MUCH better selection and variety at plumbing supply houses.

Not everybody has access to Plumbing Supply House and besides that they treat you like your from MARS when your not in the trade and have an account there. I know been in the business over 40 YRS.

drh146 09-07-2011 09:34 AM

some dishwashers use a valve that let the 'correct' amount of water in regardless of the pressure (as long as it is over a certain pressure). if yours says to use a certain diameter hose, maybe its valve needs that size to get to that minimum pressure, and therefore allow the 'correct' volume. But i would think this minimum is pretty low.

correct is in quotations because there is variation. the smaller the valves variation rating the better the valve.


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