extractor fan just humming

[chopperxbox]

My friend has a restaurant and the kitchen extractor fan has stopped working but when you turn it on it just hums. It's a 450v 12 inch inline extractor. I changed the capacitor for a new one and still the same. It's about 9 years old and 6 months ago he had it cleaned out. He said they jet washed it. It's there anything else I could try or does he just need a new one. Any help or advice is appreciated. Thanks.

 

[camerabloke]

Really? What do you think? Ill give you a clue......water ingress

 

[davesparks]

What tests have you carried out and what results did you get?

 

[Marvo]

IR test the motor and continuity test the two windings assuming single phase motor. Just out of interest why on earth would anyone jet wash a motor and expect it ever to run again?

 

[davesparks]

I assume (hope) they've jet washed the insides of the ducting and fan rather than the motor itself.

 

[Pete999]

IR test the motor and continuity test the two windings assuming single phase motor. Just out of interest why on earth would anyone jet wash a motor and expect it ever to run again?

The OP mentioned it was 450v and it had a capacitor, think you are right mate single phase for sure, for the OP have you got the voltage right, the rotor ain't jammed solid with rust is it?

 

[mayfair]

If its like every extractor fan I've ever had to bits its so full of cr*p that its totally not worth getting sticky for.

 

[Marvo]

The OP mentioned it was 450v and it had a capacitor, think you are right mate single phase for sure, for the OP have you got the voltage right, the rotor ain't jammed solid with rust is it?

Yeah, I was also confused by the voltage stated, it's a very odd supply voltage, then I thought the 450v probably refers to the discharge voltage written on the capacitor. If the motor has a capacitor then it's 99.99% certain it's single phase. Also it's only 12 inches diameter so it's basically a domestic fan by the sounds of it.

 

[davesparks]

You have big domestic fans in you part of world mr Marvo!

 

[Geordie Spark]

You have big domestic fans in you part of world mr Marvo!

Careful now!!

 

[telectrix]

go back with a piano. try and work out which tune it's humming then see if you can play it.

 

[Geordie Spark]

go back with a piano. try and work out which tune it's humming then see if you can play it.

Blaydon Races or Cushy Butterfield would be good.

 

[telectrix]

was thinking more of " dad, do you know the piano's on my foot"

 

[Geordie Spark]

was thinking more of " dad, do you know the piano's on my foot"

If you can hum it I'll play it son!




Or ...... What key would you like me to play it in???

Wong Key ...... the Chinese Piano Tuner.

 

[uksparks]

Really? What do you think? Ill give you a clue......water ingress

They may have washed it out with a non conducting oil.... Nah doubt it.

 

[shanky887614]

They may have washed it out with a non conducting oil.... Nah doubt it.

if you wash them out with pure water then it will be fine cause its the contaminents in tap/bottled water that fries electronics

could have used cooking oil, I heared of people using standard cooking oil to cool electronics

 

[Marvo]

You have big domestic fans in you part of world mr Marvo!

I have a 300mm fan in the ceiling of the bathroom in my guest flat (wired directly off the light circuit and no separate isolator) , I'd have thought a 12 inch fan is a bit small for most commercial applications like kitchen extract TBH.

 

[davesparks]

I have a 300mm fan in the ceiling of the bathroom in my guest flat (wired directly off the light circuit and no separate isolator) , I'd have thought a 12 inch fan is a bit small for most commercial applications like kitchen extract TBH.

I wasn't doubting you at all, its just that a 4" fan is normal for bathrooms here. You usually only see 6" fans when some numpty installer doesn't understand the basics of ventilation and thinks a bigger fan will improve the ventilation when all it really needs is some airflow into the room.

 

[ifindoubtdont]

At 9 years old it's probably full of crud that's baked on so it doesn't owe you anything. So swop it out for a brand new sparkly all singing all dancing 12 million megapixal blowjob thingy, other than that try WD40. lol

 

[Knobhead]

if you wash them out with pure water then it will be fine cause its the contaminents in tap/bottled water that fries electronics

could have used cooking oil, I heared of people using standard cooking oil to cool electronics

You can’t be serious.

The moment you start to wash anything the water picks up contaminates.

OP, just change the fan, if it’s a commercial operation they can afford it.

Vegetable oil is used for some transformers, it’s a bit purer than the stuff in your local geasy spoon.

 

[joel89]

yes I agree with Tony, just tell them its ****ed !