Thread Number: 53573
Kitchenaid Imperial by Hobart dishwasher. Model KDI-56 |
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Post# 759393   5/25/2014 at 00:34 (3,595 days old) by xpanam (Palm Springs California )   |   | |
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Post# 759482 , Reply# 1   5/25/2014 at 19:44 (3,594 days old) by combo52 (50 Year Repair Tech Beltsville,Md)   |   | |
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This was the very first KA DW to have a 750 Watt Booster heater than ran during the cycle, except for the KDS-15 and the KDS-16.
After this KA dropped the water heater in the KDC and KDI 17s and KDC and KDI 18s, KA was THE LAST US DW maker to build a home DW that did not have a heater to boost the water temperature across the line, for this reason I would never have anything except a Superba among these 60s and 70s KA models. |
Post# 759485 , Reply# 2   5/25/2014 at 20:10 (3,594 days old) by Launderess (Quiet Please, There´s a Lady on Stage)   |   | |
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What exactly was behind the logic of Kitchenaid dishwashers not heating water until so late in the game? Have looked into and was often tempted to go after a nice vintage KA/Hobart portable but after hearing they don't heat water was put off. Am not going to stand around before each cycle and purge the hot water lines to get 120F or 140F water.
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Post# 761381 , Reply# 4   6/4/2014 at 04:36 (3,585 days old) by Launderess (Quiet Please, There´s a Lady on Stage)   |   | |
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According to a consumer advice report one read from the 1960's or so (it was about saving on energy bills in particular hot water), the author queried top dishwasher manufacturers and makers of detergents as to why machines needed water at 140F to 150F.
According to the responses it was universally agreed that the types of soils found on dishes (fats, tallows, etc...) do not dissolve at temps <130F. The dishwasher detergents on the market at that time did not dissolve at temps <115F or so. Most all dishwashers then had 700w heaters that could do little more than maintain water temp, not raise it. This is because of simple math; the heaters had only enough power to raise water temps about degree Fahrenheit for each minute. With wash cycles usually between seven or nine minutes you would only end up with taking say 120F water to about 130F or less before the cycle was over. At that time there were only two domestic dishwashers equipped with thermostats that would hold timers until the proper wash or rinse temperature was reached. One was Westinghouse, cannot remember the other. With such low heating power it would take about 35 or forty minutes for dishwashers to take 120F (or less) water up to the required minimum of 140F. Some households/housewives did balk at having their water heaters set to 140F or above for reasons ranging from cost to possible scalding burns. What the author of the piece did was install an inline tankless heater to the hot water line that fed the dishwasher. This enabled him to lower the thermostat on his water heater to 125F but still allow for 140F water for the dishwasher. |
Post# 1075776 , Reply# 6   6/4/2020 at 23:24 (1,392 days old) by bradfordwhite (central U.S.)   |   | |
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Post# 1075817 , Reply# 9   6/5/2020 at 07:00 (1,392 days old) by combo52 (50 Year Repair Tech Beltsville,Md)   |   | |
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It is either a pump problem or motor bearings, First look under the machine at the motor to see if water has been leaking over the motor for a period of time [ you will see lots of corrosion damage ] If it looks OK underneath disassemble the pump from inside the machine and remove both impellers.
Then turn off the water to the DW and run the motor to see how it sounds, if it sounds fine replace the drain impeller and seal [ get new parts ] if it is still noisy get another motor [ you will still ned new drain impeller and seal.
John L. |
Post# 1075862 , Reply# 10   6/5/2020 at 11:41 (1,392 days old) by bradfordwhite (central U.S.)   |   | |
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It's impressive that two small spots is all the damage there is.
If you want to maintain them and keep them from further rusting which will stain your dishes and the dishwasher: 1. get some repair material solution. 2. cut off or clean the heavily rusted areas with a wire brush. 3. clean the area with rubbing alcohol. 4. coat liberally with the solution leaving no gaps. 5. recoat if desired. 6. let air dry for a couple of days. This post was last edited 06/05/2020 at 12:11 |