vacerator
Well-known member
I don't notice any real difference in drying times when a dryer has a drum moisture sensor and one in the exhaust plenum from one that only has one in the exhaust. Which has priority?
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- Thread starter Chetlaham
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A sensor in the exhaust, usually the blower housing, is for temperature. I've not known of any dryers that have a moisture sensor in that location, being that moisture sensors (in the drum) by design require contact with the clothes.
If there are any dryers with a true moisture sensor in the exhaust airflow, perhaps someone in-the-know can bring them to attention with details on the device via part diagrams and part numbers?
If there are any dryers with a true moisture sensor in the exhaust airflow, perhaps someone in-the-know can bring them to attention with details on the device via part diagrams and part numbers?
vacerator
Well-known member
Ok, then where is the auto dry sensor, as my Whirlpool has auto dry and no drum sensor?
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Whirlpool uses a power dropping resistor to drop the voltage down to the timer, when the cycling thermostat opens or the high limit thermostat, it completes a circuit and sends power to the timer motor. A little more complicated to understand than a double throw switch thermostat which is a little more straightforward.
My favorite auto dry was the one used on Galaxy dryers. They took advantage of a 240 volt timer motor and made it work with two contacts like timed dry. I think more dryers should have gone this route:
Well one thing that springs to mind is the conductivity of your water compared to your mother's, based on hardness and other water chemistry. Some Miele dryers have a setting to allow for this. Miele says that soft water is less conductive and the dryer will leave clothes damper.
I know that your dryers are electric, so it could be that your voltage is 240 V and your mother's is 208 V or that hers is just generally lower. This would increase drying time but may have no effect on the dryness level, depending on the dryer's logic.
Am I thinking along the same lines as you or shall I try another guess?!
Thermostatic auto-dry operates the timer according to the heating profile, controlled by the drying temperature thermostat somewhere in the exhaust air path. The timer doesn't run when the heating element is on. The timer runs when the target temperature is reached and the heat cycles off.
Moisture-sensing auto-dry operates the timer according to the "hits" on the sensor bars in the drum, independently of the heating profile.
Perhaps this is the video that Chetlaham was attempting to link? The fellow makes a technical error when he says the thermo-switch is in the basket (drum) ... although it may be on the filter housing, which kinda is in the drum.
The video is Seans but it did not work when he originally liked it. You got it working.
Just want to say, the video is spot on and describes auto dry perfectly along with why it works so well regardless of the load size.
The beauty is that auto dry can be implemented even on the most simplest dryers with a two contact timer without extra components except a resistor in the case of a 120 volt timer motor.
Just want to say, the video is spot on and describes auto dry perfectly along with why it works so well regardless of the load size.
The beauty is that auto dry can be implemented even on the most simplest dryers with a two contact timer without extra components except a resistor in the case of a 120 volt timer motor.
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vacerator
Well-known member
Thank's Sean! Yeah, I looked it up and it uses the plenum T-stat to regulate timer motion.
simpsonencore
Member
That's what I miss about my ED56 - whatever setting you put it on, whether it be low temp/light dry or regular temp/med-extra dry, every last item you put in there, is perfectly dry at the end!
Its replacement doesn't do that - claims it has an auto dry sensor, but most clothes are still quite damp after that cycle...
The factor I'm considering for the operational difference is that mom's machines are in an outdoor room off the carport, external to the climate-controlled envelope of the house. It gets hot in the summer, cold in the winter season, no humidity control. A secondary factor perhaps is that mom typically sorts by how the items are used, not by fabric weight/type. "Wear" clothes are washed together .... jeans, slacks, shorts, knit/synthetic and lightweight cotton tops, lingerie ... which mixes disparate fabric weights. Bath towels may go with sheets.
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