1700 cfm 12" 4.1 amp in line fan speed controller? - Growroom Designs & Equipment - International Cannagraphic Magazine Forums

p0opstlnksal0t · 03-04-2018, 06:10 PM

Anyone have any ideas what fan speed controller I need? I've used the cheap rheostat versions and they just can't supply the amperage. I bought a 5 amp variac and it blows the 5 amp fuse on startup. I tried a 6 amp fuse and half the time it will blow that. When it doesn't blow it and I dim the voltage do around 78 volts everything runs OK for a few minutes then the fan shuts down due to the thermal overload protection and takes about an hour to cool down before I can plug it back in and have it work again.... not sure what I should try next?

Wendull C. · 03-04-2018, 06:33 PM

Get a bigger rheostat. One of mine looks like a coffee can with a dial on it, its so damn big.

p0opstlnksal0t · 03-04-2018, 07:07 PM

Ya that's what my variac is but it's still not working... properly. When I dial down from the originAL speed it's like the fan overheats and thermal safety kicks on. Maybe I should call hydrofarm. The description of the fan said it was speed controllable

p0opstlnksal0t · 03-04-2018, 07:09 PM

Looks like this

watts · 03-05-2018, 01:13 AM

Get the 10 amp variac. I believe that is the next size up from the 5 amp.

You want the amp rating to be at least 1.5x what the rating of your fan is. So if your fan is rated for 4 amps, it will have a surge of 6 amps on start up. Never lower the speed of a fan below 50% of its rated speed. This may cause the fan to overheat.

p0opstlnksal0t · 03-05-2018, 01:35 AM

The problem is the lower voltage to dim the fan is causing the fans own thermal overload to kick on. It's supposed to be speed controllable but even when I don't pop a fuse in the varia and it runs at about 65% voltage around 75 volts the fan heats up and kicks off. Does a vfd lower voltage in the same manner?

Andyo · 03-05-2018, 02:07 AM

https://www.kaeltetechnik-shop.at/Fan...SEC-33-Eliwell
i ran scroll fans and duct fans off these the 7 amp rated 220/240 v
rate of increase per deg c controllable max min speed set ect
1x 800 cu/ft/min in another same out,easy to control negative pressure with settings

Thing is the fan i clearly remember 800 cu/ft/min drawing only 1.2 amps 220 v
You must have resistance or your on 110 V

Andyo · 03-05-2018, 02:20 AM

I used these https://www.airflow.com/Product-Deta...e-Inlet-EC-Fan and much bigger on fasec-33 speed controls silent running.

p0opstlnksal0t · 03-05-2018, 02:50 AM

It's 120v 4.1 amp

The hydrofarm phat 12" fan

watts · 03-05-2018, 10:53 PM

Maybe it is the fan then. I am using an 8" Hurricane inline fan with a 3 amp variac. It works great.

03-04-2018, 06:10 PM	#1
p0opstlnksal0t Member Join Date: Apr 2010 Posts: 631	1700 cfm 12" 4.1 amp in line fan speed controller? Anyone have any ideas what fan speed controller I need? I've used the cheap rheostat versions and they just can't supply the amperage. I bought a 5 amp variac and it blows the 5 amp fuse on startup. I tried a 6 amp fuse and half the time it will blow that. When it doesn't blow it and I dim the voltage do around 78 volts everything runs OK for a few minutes then the fan shuts down due to the thermal overload protection and takes about an hour to cool down before I can plug it back in and have it work again.... not sure what I should try next?
	Quote

03-04-2018, 06:33 PM	#2
Wendull C. Senior Member Join Date: Nov 2012 Location: Where the peaks meet the sky Posts: 1,370	Get a bigger rheostat. One of mine looks like a coffee can with a dial on it, its so damn big.
	Quote

03-04-2018, 07:07 PM	#3
p0opstlnksal0t Member Join Date: Apr 2010 Posts: 631	Ya that's what my variac is but it's still not working... properly. When I dial down from the originAL speed it's like the fan overheats and thermal safety kicks on. Maybe I should call hydrofarm. The description of the fan said it was speed controllable __________________ New England Garage 8kw Rev Micro DEVA's, 32 plant, coco, dtw
	Quote

03-04-2018, 07:09 PM	#4
p0opstlnksal0t Member Join Date: Apr 2010 Posts: 631	Looks like this Attached Thumbnails
	Quote

03-05-2018, 01:13 AM	#5
watts ohms Join Date: Dec 2011 Posts: 1,788	Get the 10 amp variac. I believe that is the next size up from the 5 amp. You want the amp rating to be at least 1.5x what the rating of your fan is. So if your fan is rated for 4 amps, it will have a surge of 6 amps on start up. Never lower the speed of a fan below 50% of its rated speed. This may cause the fan to overheat.
	Quote

03-05-2018, 01:35 AM	#6
p0opstlnksal0t Member Join Date: Apr 2010 Posts: 631	The problem is the lower voltage to dim the fan is causing the fans own thermal overload to kick on. It's supposed to be speed controllable but even when I don't pop a fuse in the varia and it runs at about 65% voltage around 75 volts the fan heats up and kicks off. Does a vfd lower voltage in the same manner? __________________ New England Garage 8kw Rev Micro DEVA's, 32 plant, coco, dtw
	Quote

03-05-2018, 02:07 AM	#7
Andyo Senior Member Join Date: Mar 2007 Posts: 1,192	7 amp FASEC-33 https://www.kaeltetechnik-shop.at/Fan...SEC-33-Eliwell i ran scroll fans and duct fans off these the 7 amp rated 220/240 v rate of increase per deg c controllable max min speed set ect 1x 800 cu/ft/min in another same out,easy to control negative pressure with settings Thing is the fan i clearly remember 800 cu/ft/min drawing only 1.2 amps 220 v You must have resistance or your on 110 V __________________ No surrender
	Quote

03-05-2018, 02:20 AM	#8
Andyo Senior Member Join Date: Mar 2007 Posts: 1,192	scroll fans double inlet I used these https://www.airflow.com/Product-Deta...e-Inlet-EC-Fan and much bigger on fasec-33 speed controls silent running. __________________ No surrender
	Quote

03-05-2018, 02:50 AM	#9
p0opstlnksal0t Member Join Date: Apr 2010 Posts: 631	It's 120v 4.1 amp The hydrofarm phat 12" fan __________________ New England Garage 8kw Rev Micro DEVA's, 32 plant, coco, dtw
	Quote

03-05-2018, 10:53 PM	#10
watts ohms Join Date: Dec 2011 Posts: 1,788	Maybe it is the fan then. I am using an 8" Hurricane inline fan with a 3 amp variac. It works great.
	Quote