Electronics > Beginners
Electric shower goes mad hot when i switch to a cooler setting...why?
ocset:
Please help to explain the temperature switching in my Aqualisa “Vitalise S” electric shower?
Its initially going mad hot when I switch to a cooler setting .
At 18:02 of this video, we see the likely heater format of the heater element selector switches….
Electric shower teardown…..
In my shower (my landlord’s so I cant take it apart), I have three temp settings….(1=coldest…2=medium….3 = hottest)…when I am in the shower and switch from 2 to 1…..the shower first goes mad hot, then trips out on overtemperature and so then goes stone cold…….then gradually warms up to setting 1.
I believe the following is happening…would you agree?.... :-//
The switch actuator, on its way from 2 to 1, actually transitions through setting 3, making it go mad hot. What surprises me, is that this short transition actually has an effect… being so short in time.
I am wondering if there is some delay in the switching mechanism?
Also, no doubt I am wearing out the switch by switching it in the shower…..16A, 250V switches usually have a 10000 ops lifetime…but does this refer to making/breaking at mains peak, or mains zero cross or elsewhere on the cycle? :-//
16A switch
https://www.infinite-electronic.hk/datasheet/4f-H8350ABBB-B.pdf
German_EE:
Best guess:
The 'medium' setting has a 1Kw load across 230V and the 'high' setting has a 2Kw load. When you switch between settings both of the heaters are briefly connected producing a 3Kw heater.
Cyberdragon:
--- Quote from: German_EE on January 02, 2020, 05:34:32 pm ---Best guess:
The 'medium' setting has a 1Kw load across 230V and the 'high' setting has a 2Kw load. When you switch between settings both of the heaters are briefly connected producing a 3Kw heater.
--- End quote ---
Design fault then, the switch in something like that should never be make before break. :--
German_EE:
It's your landlord's shower so, as you said, you can't take it apart. What you can do is the following:
1. Make 100% certain that the shower is electrically isolated from the power on both live and neutral.
2. Go away, have a coffee, and then check again that the supply is completely isolated from the shower.
3. Test the DC resistance of the shower at various settings, look for jumps up and down in the resistance as you alter the control.
4. Restore the 230V feed, have another coffee then come back and check your work.
If in doubt, stop, being curious is one thing but naked EEVBlog users, water and mains power do not mix.
Ampera:
--- Quote from: German_EE on January 02, 2020, 06:50:54 pm ---If in doubt, stop, being curious is one thing but naked EEVBlog users, water and mains power do not mix.
--- End quote ---
It sounds like you speak from experience there.
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