Thread Number: 75367
/ Tag: Modern Dishwashers
Power clean heating delay issue |
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Post# 992126 , Reply# 2   4/25/2018 at 19:17 (2,164 days old) by combo52 (50 Year Repair Tech Beltsville,Md)   |   | |
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We have run into this problem with these porclean tub WP built DWs when in water heating delay, My solution has been to put heavy fiberglass insulation under the thromostat so the thromostat can better sense the temperature in the tank and is not so much affected by the ambient air temperature under the DW.
John L. |
Post# 992153 , Reply# 5   4/25/2018 at 23:42 (2,164 days old) by chetlaham (United States)   |   | |
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Post# 992167 , Reply# 6   4/26/2018 at 06:54 (2,164 days old) by vacerator (Macomb, Michigan)   |   | |
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has a large effect. The dishwasher's heater can only raise the temp. one degree in ten minutes. At least back then. |
Post# 992170 , Reply# 7   4/26/2018 at 07:21 (2,163 days old) by combo52 (50 Year Repair Tech Beltsville,Md)   |   | |
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WP did make DWs without this feature, they did not clean well unless your water was pretty hot but because of the shorter wash periods without heating delay they still did not clean really dirty stuff as well.
WP porclean tub DWs used an 800 watt heater, if the DW was well insulated on the outside of the tank it would easily raise the water temp 1-2 F per minute. With my 1987 WP PC DWs fully loaded it usually delays in the main wash 10 or 15 minutes to get from 130 F incoming temp to over 150F actual circulating temp [ If I put a # 1 plastic salad dressing bottle in the DW for washing so it can be recycled it always distorts and partly melts in the wash and rinse periods ] Note I always use air dry and because of the hot main wash and final rinse dishes are always dry even if the door is left closed over night etc.
Adding insulation under the thromostat was in a WP tech bulletin to solve the possible problem of a DW running to long during a heating cycle, it was usally more of a problem when the area under the machine was cold and drafty.
John L. |
Post# 992190 , Reply# 8   4/26/2018 at 09:46 (2,163 days old) by chetlaham (United States)   |   | |
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Post# 992197 , Reply# 9   4/26/2018 at 10:30 (2,163 days old) by potatochips ( )   |   | |
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KA machines also had thermostatic holds. |
Post# 992198 , Reply# 10   4/26/2018 at 10:30 (2,163 days old) by combo52 (50 Year Repair Tech Beltsville,Md)   |   | |
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Post# 992202 , Reply# 11   4/26/2018 at 11:58 (2,163 days old) by chetlaham (United States)   |   | |
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Bummer in that they did not extend the wash time on Whirlpool power cleans that did not do a thermal hold. Other brand models which did not do a thermal hold extended the main wash time on average by 10-15 minutes after the early 80s.
Maytag, Kitchen-aid and Frigidaire also made models that did thermal holds and like Whirlpool the main wash was usually shorter in terms of raw increments. But there no thermal hold models compensated accordingly. I know stats are over all reliable, however having a BOL power clean model gives more to consumers and a lesser price IMO. |
Post# 992208 , Reply# 12   4/26/2018 at 13:29 (2,163 days old) by johnb300m (Chicago)   |   | |
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Something to note:
The temperature that thermostats read through plastic tubs will often have a known offset between water temp and what the "tub temp" is. Example being, if the t-stat has to read temp through a plastic barrier, it'll have an offset value, example being, 15 degrees less or so. Steel tubs likely read exact temp since steel transfers heat well. |
Post# 992214 , Reply# 14   4/26/2018 at 13:59 (2,163 days old) by chetlaham (United States)   |   | |
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Post# 992215 , Reply# 15   4/26/2018 at 14:04 (2,163 days old) by chetlaham (United States)   |   | |
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Here is the one I saw on those latter models:
www.repairclinic.com/Part... Rubber O ring to stop water from leaking out. Here is the pump housing the stat mounts to: www.repairclinic.com/Part... |
Post# 992217 , Reply# 16   4/26/2018 at 14:07 (2,163 days old) by chetlaham (United States)   |   | |
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