Heater Fan
------------------------------
Date: Thu, 7 Nov 1996 15:47:55 -0500
From: Jeff Murray
Subject: Heater Resistor
To: "'TLCA Mailing List'"
Todd
Resistors work on a logorithmic scale so values are sometimes a little
strange. You should be looking for a 8.2 ohm 10 watt resistor wire wound
resistor. The wattage can be larger as this only expresses the amount of
power (heat) that it can disapate. There are also alternative that can
give an equivalent resistance of approximatly 8 ohms.
- - Two 16 ohm 5 watt resistors in parallel (both ends ties together) will
give an effective value of 8 ohms 10 watts.
- - Two 4 ohm 5 watt resistors in series (one end of each tied together)
will also give an effictive value of 8 ohms 10 watts.
Anyway, try an electronics supplier for an 8.2 ohm 10 watt wire wound
resistor. Try asking the supplier over the phone if thay carry IRC, Dale
or Ohmite resistors to name a few brands. The whole thing should cost
under $5.
Good Luck
Jeff Murray (jmurray@atlantis.com)
------------------------------
Date: Fri, 08 Nov 1996 00:12:58 -0300
From: Rod LaHaise
Subject: Heater Resistor
To: TLCAL@tlca.org
At 03:47 PM 11/7/96 -0500, Jeff Murray wrote:
>Resistors work on a logorithmic scale so values are sometimes a little
>strange. You should be looking for a 8.2 ohm 10 watt resistor wire wound
>resistor. The wattage can be larger as this only expresses the amount of
>power (heat) that it can disapate. There are also alternative that can
>give an equivalent resistance of approximatly 8 ohms
My weakest area in automotive is electrical (that's why I have a heater that
only works on HI, but my Radio Shack catalogue (Canadian) shows a
non-inductive resistor 8-ohm 20 watts, 5% tolerance for $2.79 pn 271-120. Is
this what I'm after or is the 5% like a duty cycle?
______________ ***** NOTE NEW E-MAIL ADDRESS ***** ______________
Rod LaHaise, lcruiser@nbnet.nb.ca True North TLC, TLCA #3926=20
'80 Toy FJ40, FabTech tub,tilt,Warn 6000,32x11.5x15 BFG MT's, GPS
'86 Toy HJ60,wife's daily driver with many scars from Catamount /96
(506) 757-8468 | FAX:(506)446-3305 | Cellular:(506)643-0492
** Latest addition 78 FJ-45 LWB 1-Ton pickup **
http://www.off-road.com/~beck/ =20
45=B024.033'N 66=B016.927'W
_______________________________________________
------------------------------
Date: Thu, 7 Nov 1996 22:21:26 +0000
From: "Mike Graham"
Subject: Heater Resistor
To: TLCAL@tlca.org
> - Two 4 ohm 5 watt resistors in series (one end of each tied together)
> will also give an effictive value of 8 ohms 10 watts.
Whoa! It's been a while since my electronics courses in
university, but I seem to remember that to get 8 ohms and 10 watts
with two 4s in series, you would need 2 10 WATT resistors.
/---------------------------------------------------/
Mike Graham, TLCA #5047
,
1981 BJ42 24V Diesel Land Cruiser "The Chew Toy"
Find the ORDFAQ at
------------------------------
Date: Thu, 7 Nov 1996 22:35:25 +0000
From: "Mike Graham"
Subject: Heater Resistor
To: TLCAL@tlca.org
> My weakest area in automotive is electrical (that's why I have a heater that
> only works on HI, but my Radio Shack catalogue (Canadian) shows a
> non-inductive resistor 8-ohm 20 watts, 5% tolerance for $2.79 pn 271-120. Is
> this what I'm after or is the 5% like a duty cycle?
5% tolerance means that the rating is 8 ohms +/- 5%. In other
words, it could be anywhere from 7.6 ohms to 8.4 ohms. No biggie.
5% is real tight. Many resistors are +/- 10% or 20%.
/---------------------------------------------------/
Mike Graham, TLCA #5047
,
1981 BJ42 24V Diesel Land Cruiser "The Chew Toy"
Find the ORDFAQ at
------------------------------
Date: Fri, 08 Nov 1996 03:05:28 -0300
From: Rod LaHaise
Subject: Heater Resistor
To: TLCAL@tlca.org
At 10:35 PM 11/7/96 +0000, Mike Graham wrote:
> 5% tolerance means that the rating is 8 ohms +/- 5%. In other
>words, it could be anywhere from 7.6 ohms to 8.4 ohms. No biggie.
>5% is real tight. Many resistors are +/- 10% or 20%.
So it sounds to me like the heater resistor problem has been solved for a
mere $2.79, now I just have to get my wife to give me back my 40 so I can
pick one up at Radio Shack and see if it works.
Rod
______________ ***** NOTE NEW E-MAIL ADDRESS ***** ______________
Rod LaHaise, lcruiser@nbnet.nb.ca True North TLC, TLCA #3926=20
'80 Toy FJ40, FabTech tub,tilt,Warn 6000,32x11.5x15 BFG MT's, GPS
'86 Toy HJ60,wife's daily driver with many scars from Catamount /96
(506) 757-8468 | FAX:(506)446-3305 | Cellular:(506)643-0492
** Latest addition 78 FJ-45 LWB 1-Ton pickup **
http://www.off-road.com/~beck/ =20
45=B024.033'N 66=B016.927'W
_______________________________________________
------------------------------
Date: Fri, 08 Nov 1996 02:04:33 +0000
From: Willem-Jan Markerink
Subject: Heater Resistor Pt. II
To: TLCAL@tlca.org
On 6 Nov 96 at 17:37, todd wrote:
> I'm still searching for an alternative other than specter's 50.00 resistor
> for my heater fan blower.Specter reccommends a 8 ohm 10 watt resistor.The
> closest thing to this I can find is a 10 ohm 10 watt resistor.Any electrical
> people out there know if this would be a suitable substitution?It's all
> french to me after Pos. and Neg.
With 10 Ohm it will run 25% slower than with 8 Ohm. Not a very good
idea, an old and sluggish fan would have trouble getting started, and
it might run hotter than desirable.
You can run two or more resistors in parallel to get less Ohm, the
formula is: 1/resistanceA + 1/resistanceB= 1/total resistance
So if you want 1/8, then 1/8 must equal 1/10 + 1/?
1/8 = 1/10 + 1/?
10/80 = 8/80 + 1/?
2/80 = 1/?
1/40 = 1/?
? = 40 Ohm, voila!
- --
Bye,
_/ _/ _/_/_/_/_/ _/_/_/_/_/
_/ _/ _/ _/ _/ _/ _/
_/ _/ illem _/ _/ an _/ _/ _/ arkerink
_/_/_/
The desire to understand
is sometimes far less intelligent than
the inability to understand
[note: 'a-one' & 'en-el'!]
------------------------------
Date: Thu, 7 Nov 1996 08:47:54 PST
From: tiltontech@juno.com (Gary G Tilton)
Subject: Heater Resistor replacement
To: TLCAL@tlca.org
Todd Todd@mail.sni
Todd I don't have my wiring diagrams with me this morning, but you can
buy a 10 Ohm 10 watt resistor from Radio Shack.
If the original resistor was 8 ohm your heater will run a little bit
slower on low when you put in a 10 ohm resistor. I will look at my cruiser
this afternoon to verify the wattage and resistance. But Todd I
thought the resistor on my cruiser was a 25 watt unit.
++++++++++++++++++++++++++++++++++++++++++++++++++++
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