That's an impressive looking fan, much better built than modern stuff.
Replace old extractor fan - no permenant live - options
- Thread starter dishman
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Echo - I was thinking that too, but I had no frame of reference to compare. It feels solidly built though. I was suprised that the fan was metal when I first took it out. After it cleaned up so well, it was part of the reason why I decided to just keep it as is.
Out of interest, on the third picture from the bottom, which shows the wiring terminal block on the interior of the casing, what would the white wire from the motor be?
It has no corresponding input wire connected to the block.
I can see the red to brown, black to blue, the bare earth cable connects to a fourth terminal just out of picture (I assume to another earth from the motor).
So what is the white cable from the motor for?
Out of interest, on the third picture from the bottom, which shows the wiring terminal block on the interior of the casing, what would the white wire from the motor be?
It has no corresponding input wire connected to the block.
I can see the red to brown, black to blue, the bare earth cable connects to a fourth terminal just out of picture (I assume to another earth from the motor).
So what is the white cable from the motor for?
most centrifugal fans were built like that and soldier on for years, and the designs barely changed, just more modern covers.
nu aire would probarly know the air flow, or look at newer similar models or other makes, like manrose 100mm centrifugal, as there far more powerful than 100mm axial fans, hence they cost a lot more, ones selling on ebay usually state airflow, to give you an idea..
You often brought seperate control modules, like timers and humidistats that plugged inside the box and they may have involved the white wire, again nu aire may be able to answer that
nu aire would probarly know the air flow, or look at newer similar models or other makes, like manrose 100mm centrifugal, as there far more powerful than 100mm axial fans, hence they cost a lot more, ones selling on ebay usually state airflow, to give you an idea..
You often brought seperate control modules, like timers and humidistats that plugged inside the box and they may have involved the white wire, again nu aire may be able to answer that
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If the wire is not for a timer, it could be for a different speed.
Sent off an email to Nuaire.
They were really good and had a search though their archives (initially they could not find the model number) and dusted off the installation and wiring guide for this actual model!
The first one shows the air extraction rate and wiring guide.
I am not sure why air resistance decreases as volume extracted increases. I would, given a constant speed, and air pressure in the room, have thought that this would be a constant. Anywaym if it gets up to around 115m3/hr, this is pretty good and much higher than expected. Even the lowest figure of 68m3/hr is good enough really.
The wiring diagram and the last page seems to suggest the white cable is for a time delay modual which was proabably an option at the time.
They were really good and had a search though their archives (initially they could not find the model number) and dusted off the installation and wiring guide for this actual model!
The first one shows the air extraction rate and wiring guide.
I am not sure why air resistance decreases as volume extracted increases. I would, given a constant speed, and air pressure in the room, have thought that this would be a constant. Anywaym if it gets up to around 115m3/hr, this is pretty good and much higher than expected. Even the lowest figure of 68m3/hr is good enough really.
The wiring diagram and the last page seems to suggest the white cable is for a time delay modual which was proabably an option at the time.
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It's the other way around; as air resistance decreases, i.e. as the length of the duct between the fan and the outside world decreases, the volume per unit time increases.
I get it..
So i assume that the time from the lowest extraction amount 68m3/hr to the highest 115m3/hr is actually a small amount of time. So once at full speed after a minute or so should it hover around the maxium extraction rate...assuming ideal working conditions?
So i assume that the time from the lowest extraction amount 68m3/hr to the highest 115m3/hr is actually a small amount of time. So once at full speed after a minute or so should it hover around the maxium extraction rate...assuming ideal working conditions?
Of course, the more ducting..... the more resistence, got it.
I was making the mistake of think the graph was over time.....
So the resisitance in the graph, as you said in your first post, is the resitance of the ducting to the outside world. The fan therefore operates with an m3/hr in relation to the resistance of said ducting.
Am I therefore correct in assuming that as it is the top floor flat with a flat roof, and the extractor is at ceiling level; as there is a tiny distance between the extractor and the outlet, resitance should be low.
All the bathrooms are in line and have a shared ventilation shaft. Ours being at the top. So the extractor of the bottom flat would perform worse compared to a top floor flat.
I was making the mistake of think the graph was over time.....
So the resisitance in the graph, as you said in your first post, is the resitance of the ducting to the outside world. The fan therefore operates with an m3/hr in relation to the resistance of said ducting.
Am I therefore correct in assuming that as it is the top floor flat with a flat roof, and the extractor is at ceiling level; as there is a tiny distance between the extractor and the outlet, resitance should be low.
All the bathrooms are in line and have a shared ventilation shaft. Ours being at the top. So the extractor of the bottom flat would perform worse compared to a top floor flat.
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But neither axis has a time scale...
I know, I think it was because the blurb above was talking about 30 min time delay operation to fully comply with regs. That is why I asked the question, as I knew I had interpreted it wrong.
Yes. As it hppens I live in exactly such a ground floor flat, and I've just replaced my extractor with one that is quite similar to yours - but entirely plastic.
And? I mis-read the graph. I mis-understood it, I mis-interpreted it. What point are you trying to prove? I have not tried to deny the error.
I probably glanced the graph and thought it had a time componant to it, I do not know. So regardless, it was a mistake, is that so terrible?
I probably glanced the graph and thought it had a time componant to it, I do not know. So regardless, it was a mistake, is that so terrible?
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