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230v Thermostat - Electronics wiz help required
ex_directory:
I got given a temp controlled thermostat not so long ago, a friend thought I could use it on my cab. It is actually a 230v AC fan connected to a Pfannenberg thermostat FLZ 530.
It has an analog dial to control temperature and it works when you move the dial and the thermostat kicks in but bizarrely it seems to kick in when I turn the temperature dial down. The dial is marked as 0-60'c and seems to kick in at about 10'c.
I found a datasheet online for it here, but not be an electronics type, the speak confuses me slightly...
It says "FLZ 530 – Shutter (Contact closes with rising temperature – Setting knob with blue imprint)"
to me this implies as temp goes up the circuit is made and live is switched so the fan receives power?
it then goes on to say...
"- For the temperature setting of the opener the highest possible hysteresis must be added to the required minimum temperature.
For example: - required minimum temperature inside switch cabinet: 9°C (46°F)
- temperature to be set: 20°C (66°F)
- resulting from: 20°C (66°F) = required temperature 9°C + highest
possible hysteresis 11K (7K+4K)"
What?
Am I actually holding a thermostat that only kicks in when temperature gets too low?
It also goes on to say, "The information on the name plate (voltage and current) is to be heeded." - obviously but the name plate says 6a, but presumably when the circuit is closed this is just max load and the fan determines the actual amps (which is 15w)?
And finally, "- The thermostat should be assembled in the upper part of the switch cabinet at the maximum possible distance from heat creating components.".
I am thinking of using this not on my cab but in a small cabinet where my xbox, dvd and sky box live which gets hot as you can imagine! Anyone think this would not be an appropriate use of the device :timebomb: ??
DaOld Man:
I think that will work nicely for what you want to do.
--- Quote ---to me this implies as temp goes up the circuit is made and live is switched so the fan receives power?
--- End quote ---
Yes, thats what it means.
--- Quote ---"- For the temperature setting of the opener the highest possible hysteresis must be added to the required minimum temperature.
For example: - required minimum temperature inside switch cabinet: 9°C (46°F)
- temperature to be set: 20°C (66°F)
- resulting from: 20°C (66°F) = required temperature 9°C + highest
possible hysteresis 11K (7K+4K)"
What?
--- End quote ---
I would not worry about any of that.
--- Quote ---It also goes on to say, "The information on the name plate (voltage and current) is to be heeded." - obviously but the name plate says 6a, but presumably when the circuit is closed this is just max load and the fan determines the actual amps (which is 15w)?
--- End quote ---
15 watts is very low. This switch should handle that easily.
If it is 230 volts, it will be 15/230 =0.066 amps.
Unless you meant the fan is 15 amps instead of 15 watts.
If it is 15 amps it is probably way too big for what you want to do with it.
--- Quote ---And finally, "- The thermostat should be assembled in the upper part of the switch cabinet at the maximum possible distance from heat creating components.".
--- End quote ---
The thermostat will do better in the upper part, close to the exhaust hole. This way it is measuring the temperature leaving the cabinet, so it gets a truer reading. EXCEPT, when the fan is off, it may not get warm due to air outside the cab "cooling it off". I would put the thermostat near the exhaust hole, but not real close.
Heat rises, so when everything heats up, just make sure the thermostat can sense the rising hot air, so it will turn the fan back on at the correct time.
Hope this helps, and i hope I didnt confuse you more.
ex_directory:
That's all good, thanks for your help (I mean't 15 watts! Its just a standard 12cm AC fan), one thing I still don't understand though is how to read the dial -
Let's say the room temp is 20'c, i have the dial set at 60'c (max). At this point the fan is off, when I then turn the dial down, at about 10'c the fan starts. If I turn it back up again it will shut off. So obviously the dial reading 0'c to 60'c is not referring to the room temp?
fjl:
230V? Is that standard electricity where you live?
ex_directory:
--- Quote from: efjayel on April 07, 2008, 04:43:02 am ---230V? Is that standard electricity where you live?
--- End quote ---
Yep, originally the UK mains supply voltage was specified at 240 Volts RMS +/-6%.
Some time ago, to allow harmonisation across Europe, the specifications were changed to 230 Volts +10%/-6%
I just quoted this from some site ;D