Furnace blower into garage shop fan?


O

Oren

I'm converting a HVAC furnace blower fan (c1997 model) into a garage
shop fan. Salvage from my house. There are no markings, labels, etc.,
on the motor for information. I know nothing about the motor other
than four speeds.

Pic sample: (like this)

<http://s.ecrater.com/stores/136988/4b04f808b9c5f_136988n.jpg>

The black wire is high speed, the blue wire is low-high speed. The
red and orange wires are high-low or low speed (have not yet connected
/checked).

The high speed (black) gets hot as does the extension cord plugs and
the metal cowling. Putting bigger gauge cords on I still get heat on
the cord, 12 gauge (25'). Same with the blue wire, but not as hot
(metal cowling cool) or as much heat on the cord.

My next try is the high-low speed, same 12 gauge extension cord (25').
Then try the other speed, low, on the same cord.

The motor has a start capacitor; the motor runs fine. Heat on the
cord is what I want to eliminate.

Any thought on using the high speed without the heat problem?

If I have to, I can settle for the lowest speed, but prefer the higher
speed (desert hot garage).

Ideas and help appreciated.
 
R

RBM

I'm converting a HVAC furnace blower fan (c1997 model) into a garage
shop fan. Salvage from my house. There are no markings, labels, etc.,
on the motor for information. I know nothing about the motor other
than four speeds.

Pic sample: (like this)

<http://s.ecrater.com/stores/136988/4b04f808b9c5f_136988n.jpg>

The black wire is high speed, the blue wire is low-high speed. The
red and orange wires are high-low or low speed (have not yet connected
/checked).

The high speed (black) gets hot as does the extension cord plugs and
the metal cowling. Putting bigger gauge cords on I still get heat on
the cord, 12 gauge (25'). Same with the blue wire, but not as hot
(metal cowling cool) or as much heat on the cord.

My next try is the high-low speed, same 12 gauge extension cord (25').
Then try the other speed, low, on the same cord.

The motor has a start capacitor; the motor runs fine. Heat on the
cord is what I want to eliminate.

Any thought on using the high speed without the heat problem?

If I have to, I can settle for the lowest speed, but prefer the higher
speed (desert hot garage).

Ideas and help appreciated.
What is the amperage and voltage of the blower?
 
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D

DanG

I'm converting a HVAC furnace blower fan (c1997 model) into a garage
shop fan. Salvage from my house. There are no markings, labels, etc.,
on the motor for information. I know nothing about the motor other
than four speeds.

Pic sample: (like this)

<http://s.ecrater.com/stores/136988/4b04f808b9c5f_136988n.jpg>

The black wire is high speed, the blue wire is low-high speed. The
red and orange wires are high-low or low speed (have not yet connected
/checked).

The high speed (black) gets hot as does the extension cord plugs and
the metal cowling. Putting bigger gauge cords on I still get heat on
the cord, 12 gauge (25'). Same with the blue wire, but not as hot
(metal cowling cool) or as much heat on the cord.

My next try is the high-low speed, same 12 gauge extension cord (25').
Then try the other speed, low, on the same cord.

The motor has a start capacitor; the motor runs fine. Heat on the
cord is what I want to eliminate.

Any thought on using the high speed without the heat problem?

If I have to, I can settle for the lowest speed, but prefer the higher
speed (desert hot garage).

Ideas and help appreciated.

Oren, a furnace fan is normally in a closed structure and the air flow
is restricted by opening sizes. RBM asked you about amp draw as this is
what you need to NOT exceed or you will toast your motor soon. I've
made quite a few of these for different people/reasons. You'll be
really close if you close off one side of the fan with a piece of peg
board, the other side can remain full open. The amp draw will be really
close.

--


___________________________________

Keep the whole world singing . . .
Dan G
remove the seven
 
G

gregz

DanG said:
Oren, a furnace fan is normally in a closed structure and the air flow is
restricted by opening sizes. RBM asked you about amp draw as this is
what you need to NOT exceed or you will toast your motor soon. I've made
quite a few of these for different people/reasons. You'll be really
close if you close off one side of the fan with a piece of peg board, the
other side can remain full open. The amp draw will be really close.
Restriction should lessen amps.

Greg
 
O

Oren

Oren, a furnace fan is normally in a closed structure and the air flow
is restricted by opening sizes. RBM asked you about amp draw as this is
what you need to NOT exceed or you will toast your motor soon. I've
made quite a few of these for different people/reasons. You'll be
really close if you close off one side of the fan with a piece of peg
board, the other side can remain full open. The amp draw will be really
close.
Would I use peg board on the opposite side of the motor mounts as in
the photo above? I can fashion something like that. I've yet to
reduce the speed using the red / orange wires which is low-high /
low, respectively.
 
O

Oren

Restriction should lessen amps.

Greg
Using this idea to restrict the air flow into the blower, could I get
/ go back to the high-speed (black wire) that I prefer?

Eventually this fan will be on a small dolly that I can wheel around
and use in various situations. Hopefully, have an on / off switch.

Also I would use hardware cloth to keep my fingers safe :-\
 
O

Oren

Um, maybe measure it? ;-)
Gosh dang it, now I need another tool. I'm dangerous when it comes to
electrical work. My policy is keep one hand in my pocket (G).
 
P

Paul Drahn

I'm converting a HVAC furnace blower fan (c1997 model) into a garage
shop fan. Salvage from my house. There are no markings, labels, etc.,
on the motor for information. I know nothing about the motor other
than four speeds.

Pic sample: (like this)

<http://s.ecrater.com/stores/136988/4b04f808b9c5f_136988n.jpg>

The black wire is high speed, the blue wire is low-high speed. The
red and orange wires are high-low or low speed (have not yet connected
/checked).

The high speed (black) gets hot as does the extension cord plugs and
the metal cowling. Putting bigger gauge cords on I still get heat on
the cord, 12 gauge (25'). Same with the blue wire, but not as hot
(metal cowling cool) or as much heat on the cord.

My next try is the high-low speed, same 12 gauge extension cord (25').
Then try the other speed, low, on the same cord.

The motor has a start capacitor; the motor runs fine. Heat on the
cord is what I want to eliminate.

Any thought on using the high speed without the heat problem?

If I have to, I can settle for the lowest speed, but prefer the higher
speed (desert hot garage).

Ideas and help appreciated.
What you have is a standard furnace blower. I have the identical
fan/motor on my heat pump. I also found an identical blower a few years
ago in the metal bin at the local transfer station and snagged it to use
as a cooling fan for my business.

The capacitor is not a starting capacitor. It is in series with one
winding of the motor and is there all the time. The motor actually has 5
windings. Select one of the other 4 for speed control.

The heat problem is because the bearings are dirty and resist the fan
from running at the selected speed. Take it apart and clean it all. Then
either check the capacitor, or just replace it. They are common and
available on Ebay.

When clean and lubricated and with a good capacitor, the fan will run
forever without getting hot.

For the plant cooling fan, I covered the sides of the squirrel cage
openings with plastic mesh material to keep fingers and trash out of the
fan. I also built a steel stand with a pair of wheel to make moving it
around much easier.

I also found a rotary switch I could modify to allow selection of either
off or any of the 4 speeds. People almost never run it at high speed.
Blows TOO much air!

Good luck

Paul
 
T

The Daring Dufas

Using this idea to restrict the air flow into the blower, could I get
/ go back to the high-speed (black wire) that I prefer?

Eventually this fan will be on a small dolly that I can wheel around
and use in various situations. Hopefully, have an on / off switch.

Also I would use hardware cloth to keep my fingers safe :-\
If you put it on wheels, make sure they have locks on them or make some
little wheel chocks. ^_^

TDD
 
D

DanG

Gosh dang it, now I need another tool. I'm dangerous when it comes to
electrical work. My policy is keep one hand in my pocket (G).

Oren, with the peg board on one side, you sure can use the high speed or
any speed for that matter. The reason the cord was getting hot had to
do with excessive amp draw when the motor was allowed to run
unrestricted. The peg board is easier to mount on the side that does
NOT have the motor hanging on it. YOu will probably want to handle of
some type on the top as they are top heavy. It is really easy to mount
a handy box on the outside corner of the fan (pay attention to not
getting a screw in the fan cage). You can mount a multi speed switch or
simply a light switch for simple off and on. Be aware this is not a UL
approved assembly. Common sense and reasonable care on assembly will
give you a usable tool.

Measuring the amp draw of the unrestricted motor will not give you
useful information if you do not have the design amp draw for the motor.

--


___________________________________

Keep the whole world singing . . .
Dan G
remove the seven
 
J

JIMMIE

I'm converting a HVAC furnace blower fan (c1997 model) into a garage
shop fan. Salvage from my house. There are no markings, labels, etc.,
on the motor for information. I know nothing about the motor other
than four speeds.

Pic sample: (like this)

<http://s.ecrater.com/stores/136988/4b04f808b9c5f_136988n.jpg>

The black wire is high speed, the blue wire is low-high speed. The
red and orange wires are high-low or low speed (have not yet connected
/checked).

The high speed (black) gets hot as does the extension cord plugs and
the metal cowling. Putting bigger gauge cords on I still get heat on
the cord, 12 gauge (25'). Same with the blue wire, but not as hot
(metal cowling cool) or as much heat on the cord.

My next try is the high-low speed, same 12 gauge extension cord (25').
Then try the other speed, low, on the same cord.

The motor has a start capacitor; the motor runs fine. Heat on the
cord is what I want to eliminate.

Any thought on using the high speed without the heat problem?

If I have to, I can settle for the lowest speed, but prefer the higher
speed (desert hot garage).

Ideas and help appreciated.
May be why its not used in a HVAC unit anymore

Jimmie
 
J

JIMMIE

I'm converting a HVAC furnace blower fan (c1997 model) into a garage
shop fan. Salvage from my house. There are no markings, labels, etc.,
on the motor for information. I know nothing about the motor other
than four speeds.

Pic sample: (like this)

<http://s.ecrater.com/stores/136988/4b04f808b9c5f_136988n.jpg>

The black wire is high speed, the blue wire is low-high speed. The
red and orange wires are high-low or low speed (have not yet connected
/checked).

The high speed (black) gets hot as does the extension cord plugs and
the metal cowling. Putting bigger gauge cords on I still get heat on
the cord, 12 gauge (25'). Same with the blue wire, but not as hot
(metal cowling cool) or as much heat on the cord.

My next try is the high-low speed, same 12 gauge extension cord (25').
Then try the other speed, low, on the same cord.

The motor has a start capacitor; the motor runs fine. Heat on the
cord is what I want to eliminate.

Any thought on using the high speed without the heat problem?

If I have to, I can settle for the lowest speed, but prefer the higher
speed (desert hot garage).

Ideas and help appreciated.


I'm converting a HVAC furnace blower fan (c1997 model) into a garage
shop fan. Salvage from my house. There are no markings, labels, etc.,
on the motor for information. I know nothing about the motor other
than four speeds.

Pic sample: (like this)

<http://s.ecrater.com/stores/136988/4b04f808b9c5f_136988n.jpg>

The black wire is high speed, the blue wire is low-high speed. The
red and orange wires are high-low or low speed (have not yet connected
/checked).

The high speed (black) gets hot as does the extension cord plugs and
the metal cowling. Putting bigger gauge cords on I still get heat on
the cord, 12 gauge (25'). Same with the blue wire, but not as hot
(metal cowling cool) or as much heat on the cord.

My next try is the high-low speed, same 12 gauge extension cord (25').
Then try the other speed, low, on the same cord.

The motor has a start capacitor; the motor runs fine. Heat on the
cord is what I want to eliminate.

Any thought on using the high speed without the heat problem?

If I have to, I can settle for the lowest speed, but prefer the higher
speed (desert hot garage).

Ideas and help appreciated.
I used to use oe of those I mounted it in a plywood bood thaat held 4 big air filters. I would run it when I was doing something that made a lot of dust. Really helped to keep the shop clean.

Jimmie.
 
H

Han

I used to use oe of those I mounted it in a plywood bood thaat held 4
big air filters. I would run it when I was doing something that made a
lot of dust. Really helped to keep the shop clean.

Jimmie.
I'm still using one of those. I bought a squirrel cage fan off Ebay(when
I got it, it was suitable for a raccoon), and built a box around it. I
use 2 sets of doubled-up 18x25"filters on it. Very nice, and quiet too.
 
T

trader4

Where I am, the largest furnace blower I see, is typicall 1/2 HP, which
should be 375 or so watts. Not a lot of oomph.

If the cord is getting hot, sounds like either the fan windings are bad, or
something is wired wrong. Of course, that might be the reason you found the
fan on the curb..... it's bad?
I'm down with the above. If 25ft of 12 gauge is getting
hot, something isn't right. Assuming of course this is a
typical home furnace blower. They only typically run a
15 amp circuit to the furnace, which means 14 gauge
should be plenty.
 
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K

krw

I'm kicking myself now. I had a perfectly good clamp meter that sit
for years (decades), that I only used once. Sold it in a yard sale and
now regret doing so. Off to clip my HF 20% coupons. Thanks.
Do the coupons work on sale items? Got any? I'm trekking down to Montgomery
to buy a tile saw tomorrow. The two models I'm interested in are already on
sale, but another 20% would pay for the gas. ;-)
I do regret selling the meter I had. Can't borrow one from neighbors.
Well, if you'd bring it back... ;-)
 

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