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Roof exhaust fan with too much exhaust John 10-01-2006
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Posted by John on October 1, 2006, 6:02 am
My roof exhaust is too powerful. When the electrician set it up he asked whether
I want it to full power or half. It was set to full power.

The exhaust fan takes two 230V lines. What if one 230V line is disconnected will
it be half power or will I damage to fan? I am sure to get a fully qualified
answer one would have to inspect the connections and such but generally speaking
would disconnection the other 230V line be the usual solution? I am thinking of
just shutting the breakers to the other line.

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Posted by RBM on October 1, 2006, 7:10 am
It doesn't work that way. It is probably a 230 volt motor and has two
speeds, which are internally changed. Have him or an electrician come and
reconnect it for the lower speed


> My roof exhaust is too powerful. When the electrician set it up he asked
> whether
> I want it to full power or half. It was set to full power.
>
> The exhaust fan takes two 230V lines. What if one 230V line is
> disconnected will
> it be half power or will I damage to fan? I am sure to get a fully
> qualified
> answer one would have to inspect the connections and such but generally
> speaking
> would disconnection the other 230V line be the usual solution? I am
> thinking of
> just shutting the breakers to the other line.



Posted by Mikepier on October 1, 2006, 8:11 am

RBM (remove this) wrote:
> It doesn't work that way. It is probably a 230 volt motor and has two
> speeds, which are internally changed. Have him or an electrician come and
> reconnect it for the lower speed
>

Also ask if possible if he can wire up the 2 speeds to a switch you can
control downstairs. So on really hot days you can turn it up to full
speed and other days you can have it on low speed.


Posted by CJT on October 1, 2006, 1:47 pm
Mikepier wrote:

> RBM (remove this) wrote:
>
>>It doesn't work that way. It is probably a 230 volt motor and has two
>>speeds, which are internally changed. Have him or an electrician come and
>>reconnect it for the lower speed
>>
>
>
> Also ask if possible if he can wire up the 2 speeds to a switch you can
> control downstairs. So on really hot days you can turn it up to full
> speed and other days you can have it on low speed.
>
If it's thermostatically controlled, how can it exhaust "too much?"

Just adjust the thermostat.

If there's no thermostat, get one installed.

--
The e-mail address in our reply-to line is reversed in an attempt to
minimize spam. Our true address is of the form che...@prodigy.net.

Posted by John on October 1, 2006, 1:29 pm

>It doesn't work that way. It is probably a 230 volt motor and has two
>speeds, which are internally changed. Have him or an electrician come and
>reconnect it for the lower speed

I scrambled up and looked its specification plate. It says "Y/A 380/220 V"
What does that mean? The motor is at least 30 years old if not older.

>
>
>> My roof exhaust is too powerful. When the electrician set it up he asked
>> whether
>> I want it to full power or half. It was set to full power.
>>
>> The exhaust fan takes two 230V lines. What if one 230V line is
>> disconnected will
>> it be half power or will I damage to fan? I am sure to get a fully
>> qualified
>> answer one would have to inspect the connections and such but generally
>> speaking
>> would disconnection the other 230V line be the usual solution? I am
>> thinking of
>> just shutting the breakers to the other line.
>

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