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Intermittent Circuit Breaker Tripping
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<blockquote data-quote="UNG" data-source="post: 550171" data-attributes="member: 8931"><p>From the OP's description this sounds like the fan is on the end of a long duct and the water vapour that is condensing in the duct is running back into the fan, I have also seen one fan where rain and strong winds driving in the "right" direction forced water down a 3m solid duct and into the ceiling mounted fan</p><p>It is usually ceiling mounted fans that give the most problems as the fan cover can act like a bowl holding the water until it builds up and it reaches the power connections and control board</p><p>Simple fixes can be ensuring the duct is installed so it falls (slopes) to the outside wall, if there is a drain close by a condensation trap could be installed to catch any condensate and drain it away</p><p></p><p>Problems like this can also be heavily influenced by the prevailing weather conditions and external temperatures so can be very intermittant or more prevalent at certain times of the year</p><p></p><p>Another one to look at is the fan performance figures which are generally based on a short duct length and when substantially longer ducts and especially the flexible type are used the performance (flow rate) can degrade quite significantly even on a straight duct throw in a bend or two and it's even worse this makes most of the available 4" / 100mm fans on the market unsuitable for the application as they can't achieve the air changes per hour that are required to meet the building regs</p><p></p><p>So I would check the mechanical side of the installation is upto spec before doing anything else</p></blockquote><p></p>
[QUOTE="UNG, post: 550171, member: 8931"] From the OP's description this sounds like the fan is on the end of a long duct and the water vapour that is condensing in the duct is running back into the fan, I have also seen one fan where rain and strong winds driving in the "right" direction forced water down a 3m solid duct and into the ceiling mounted fan It is usually ceiling mounted fans that give the most problems as the fan cover can act like a bowl holding the water until it builds up and it reaches the power connections and control board Simple fixes can be ensuring the duct is installed so it falls (slopes) to the outside wall, if there is a drain close by a condensation trap could be installed to catch any condensate and drain it away Problems like this can also be heavily influenced by the prevailing weather conditions and external temperatures so can be very intermittant or more prevalent at certain times of the year Another one to look at is the fan performance figures which are generally based on a short duct length and when substantially longer ducts and especially the flexible type are used the performance (flow rate) can degrade quite significantly even on a straight duct throw in a bend or two and it's even worse this makes most of the available 4" / 100mm fans on the market unsuitable for the application as they can't achieve the air changes per hour that are required to meet the building regs So I would check the mechanical side of the installation is upto spec before doing anything else [/QUOTE]
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Intermittent Circuit Breaker Tripping
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