New Whirlpool DU945 Dishwasher

[llmaytag]

Yesterday I purchased a new DU945 since I heard that they went out of production and everyone says it's a great model. I will replace the original dishwasher that was in my townhome, which is a Whirlpool basic model, dial control with Pots&Pans, Normal, Light and Rinse&Hold dial settings. The original is a white plastic wash arm, with a tower that comes up through a tube on the lower rack to wash the upper rack.

I had originally planned to have Lowe's delivery and install my new machine, but they started rolling it out to me, so I simply loaded it into my Explorer and brought it home with no provision to install it, so now it's in the original box in garage until I muster the guts to attempt an install.

Anyway, last night I searched out an online manual to see if there was a description of the wash cycles. I found it, (the link is posted). The manual does have cycle descriptions but it lists something called "purge."

Does anyone know what a "purge" process is, verus "Rinse?"

Thanks!

http://www.whirlpool.com/assets/pdfs/product/ZUSECARE/8575990.pdf

 

[luxflairguy]

Purge means...

Purge means that periodically through the wash cycle the machine is going to pause, letting any food/scraps left on dishes to settle into the water and then you'll hear the drain activate and fresh water enter the machine. Essentially, purging and flushing the wash water to help dispose of food waste. I have a new KA machine that does this.
By the way, the first load you do should only be of medium size. Why? This load is what sets the soil level device controlling the length of the cycle. Too much soil will set the machine to run for a long time. My KA runs for just over an hour having made sure the soil level in the first load wasn't too dirty. IMHO. Greg

 

[favorit]

sensor rely on the previous load ??

Are you sure ? it's true that after a very big size/ heavy soiled load the digit displays a longer cycle time for the sensor cycle, however the sensor check the current load. If the current load is less soiled than the previous the cycle time is shorthened no matter of what was displayed at the start. You'll see this very time displayed when you'll start next load and again sensor may change things during the cycle

 

[llmaytag]

Purge - Thanks

I would have never guessed that, but it's good to know.

My model is not an

 

[llmaytag]

Purge - Thanks

Hmm, that last message didn't make it. I meant to say that my model is not a sensor model so I don't think I need to worry about the initial load soil-level.

Does anyone need an older basic model Whirlpool DW? I'll have to figure out what to do with my original once I get the DU945 installed.

 

[appnut]

Leonard, Greg's above-description is right on for a modern whirlpool Tall Tub, but isn't correct for your model. Your dishwasher, a purge is a "rinse" that's between the main wash and the final rinse. This purge has a partial fill and sprays little bit of water over the dish load for about 10 to 20 seconds and then drins said small amount of water. The small amount of water is about 1/3 to 1/2 the amount needed for a regular fill. This gets some soap off the dishload and cleans the filter. This is also common on the TallTubs that don't sense extremely heavy soil or if the Pots & Pans cycle isn't used. In those two scenarious, a true full-filled rinse is executed instead of the purge, thuis yielding 2 rinses. NOW, note, your manual says that high-temp wash option adds more time, heat and water. The added water is the purge is replaced by a full rinse. Personally, I've not found any issues with rinsing on my tall tub when the purge is used rather than the fulll-fill rinse.

And Greg, btw, I'd not heard abut that intital load completely "setting" the sensor. I did know that that first load did do the equiavelnt of an extremely heavy soil because it added the full risne rather than the purge. And if that first wash cycle was interrupted (i.e. cancel button hit before it finished to the "clean" light, then the sensor would not be "set". I also understand, periodically that sensor readjusts itself based upon input about water hardness and average soil in loads. My BobLoads are 99% of the time very veryr soiled.

 

[mark_wpduet]

I never knew this

Until I read this. It drains from the main wash....fills some....turns on for maybe ten seconds, then drains again...then fills for rinse. I thought the machine was purging the hot water line so HOT water would come in, since by the time the wash is over, the water may have cooled in the line.

 

[favorit]

thanks Bob ! Purge here was a cool down

Also cold-fill-only stoneage euro dishwashers use this feature, as a cool down before the rinses (only the last rinse is heated to start the drying cycle)

Each fill is round 3 gallons : a sudden water change might break all the glasses, here comes the cooldown to help

IIRC the first euro DW without cooldown are the Philips/Bauknecht made in 1985 (ADG 664 - 666 - 668).

They use just half the water than mid 80 average machines (5.5 litres per fill vs 7--->12), so the residual heat in the sump is enough to avoid a thermic shock .

 

[pierreandreply4]

My dishwasher has that feature and its a kenmore tall tub he ultrawash system with smart wash cycle.

 

[appnut]

its a kenmore tall tub he ultrawash system with smart wash c

Mine is too!!! I've been very pleased with mine. Had my reservations because of all the "bad press" about these machines, but it's really surprised me.

 

[mrb627]

Purge

The purge is designed to clear the sump and lower tub area of dirty wash water residue before filling for the rinse. My last Kithcenaid would do the same thing.

Malcolm

 

[logixx]

Our Siemens does that, too. Depending on the soil level, it'll drain, stop and then turn the recirc pump on while filling for maybe 15 seconds. Purges take place after the main wash and the first rinse - if necessary. Heavy soil replaces the purges with another full rinse.

It doesn't need to do a cool-down because the first rinse always starts with pre-heated water from the heat exchanger. It also starts by spraying the bottom rack first so the water heats up even more before it is sprayed onto the upper rack.

The Miele will do a partial fill after the main wash, spray for 5 secs and then continue to fill. It also pre-heats the water.

 

[toggleswitch2]

Leonard.

Installation is a snap. IMHO the key is to use one of those "new" flexible DW hoses that have a SS braiding. I don't know of anyone that still uses the older copper tubing style (to fill the machnne with water) [which is a PITA to install] during a re-install.

 

[llmaytag]

Installation & Purging/Rinsing

Toggleswitch2 - Thanks. I've been telling myself that it shouldn't e that hard to install so I may attempt it next weekend. It looks like it will be pretty easy to rollout the original after I remove two small screws at the top that I think simply hold it in place.

From the manuals of all the new machines it looks like most do a "purge" after the main wash, then one rinse. My original did two rinses after every cycle, (a dial machine), and often when I'd hear the final rinse finish filling, I'd turn the dial back to the beginning of the first rinse, so I'd get three. I'll have to get over that with the new machine, lol