From: Stormin Mormon on
>Found PSC Motor Running slow and High Limit kicking out
>& re-setting

Describing the problem--the High Limit is being triggered; I believe
that's the high pressure sensor you mentioned earlier. That means the
fan is trying to blow air, but it's backing up. Another possibility
is the motor overheating and triggering it's thermal protection switch,
which will reset when the motor cools orr.

CY: More likely a temperature sensor near the top of the furnace.

> either bad motor or dirty coil.
>More than likely coil.
>Motor is not hot to touch.

The motor isn't over heating, so it and the High Limit are working
correctly,
and the problem is that something is obstructing air flow downstream from
the blower--like a coil full of lint and debris, which got that way due to
the filter not being changed monthly like it's supposed to be.

>$80

What it cost to get the same basic answer your got from the first tech; the
coil needs to be cleaned. Have whichever outfit will charge less do it.

CY: Cheaper isn't necessarly gooder, the cheap company may use sloppy labor.



From: Stormin Mormon on
Yes, you may.

--
Christopher A. Young
Learn more about Jesus
www.lds.org
..


"Donna Ohl, Grady Volunteer Coordinator" <donna.ohl(a)sbcglobal.net> wrote in
message news:%8dnj.1769$0w.1086(a)newssvr27.news.prodigy.net...
On Sun, 27 Jan 2008 18:45:15 -0500, Bubba wrote:
> PSC is Permanent Split Capacitor motor.

May I ask if the permanent split capacitor motor is the top smaller easily
replaced combusion air blower motor ... or if it's the bottom, larger
seemingly harder-to-replace house blower motor?

Donna


From: Donna Ohl, Grady Volunteer Coordinator on
On Sun, 27 Jan 2008 21:28:19 -0800, edbedb wrote:
>> May I ask if the permanent split capacitor motor is the top smaller easily
>> replaced combusion air blower motor ... or if it's the bottom, larger
>> seemingly harder-to-replace house blower motor?

Does anyone know which one it is?
From: Jeff on
Donna Ohl, Grady Volunteer Coordinator wrote:
> On Sun, 27 Jan 2008 21:28:19 -0800, edbedb wrote:
>>> May I ask if the permanent split capacitor motor is the top smaller easily
>>> replaced combusion air blower motor ... or if it's the bottom, larger
>>> seemingly harder-to-replace house blower motor?
>
> Does anyone know which one it is?


Who knows?

It's a type of motor.

<URL: http://www.iprocessmart.com/leeson/leeson_singlephase_article.htm>

My guess is that it is the smaller motor that has the smaller
starting torque needs.

Doesn't seem like anyone here is doing anything but enjoying your misery.

Jeff
From: Jeff on
Donna Ohl, Grady Volunteer Coordinator wrote:
> On Sun, 27 Jan 2008 09:21:18 -0500, Bubba wrote:
>> Then call that company and ask what they charge to come out or if they
>> charge flat rate or hourly.
>
> I called another company, as you advised, and they came out this morning.
> They said they'd charge $80 to come out and that would be put toward parts.
> They too were not sure what the problem was, but here is verbatim what they
> wrote on the sales slip afterward.
>
> Can you help decode this for me? The furnace is working but I think only
> because he changed a setting on one of the motors.

I'm not a HVAC repairman, so take what I say with a grain of salt.

The ventilation motor, the one that blows the hot air, tend to be
multiple speed devices. There's usually jumpers somewhere to set that.
It sounds like he reset a jumper to a higher speed.

>
> Here's what he wrote ...
>
> Found PSC Motor Running slow and High Limit kicking out
> & re-setting either bad motor or dirty coil.
> More than likely coil.
> Motor is not hot to touch.

The fact the motor is not hot leads to the motor not being bad. If it
runs and doesn't overheat it's probably OK.

You got a problem using google?

Here is the result for high limit kicking out:

<URL:
http://en.allexperts.com/q/Heating-Air-Conditioning-696/furnace-heat-kicking-1.htm
/>

Shut it down and clean it out. You've gone this far. Don't let those
wimps stop you. Just make sure you put it back together right!

Jeff
> $80