The fire box is lighting but the furnace fan doesn't come on. Where
is the temp relay? I've got a York Stellar Plus, Model P1UDD12N09501A
with a Honeywell Chronotherm 3 stat.

I assume the whole circuit is in the furnace itself BUT it could be in
the stat as well. I know I can turn the furnace fan hard on at the
thermostat. Maybe the York return a firebox temperature signal to the
C3.

Thanks

The blower is controlled from the furnace, not the thermostat, when the
thermostat is set in the "auto" position for the fan. It either
controlled by a mechanical bi-metal thermostatic switch or by time delay
from a circuit board. York residential equipment is not all that common
in my area, so from the model I couldn't tell you off the top of my head
which yours is likely to have. How old is the furnace?

On Jan 27, 9:14*pm, (Lp1331 1p1331) wrote:
The blower is controlled from the furnace, not the thermostat, when the
thermostat is set in the "auto" position for the fan. It either
controlled by a mechanical bi-metal thermostatic switch or by time delay
from a circuit board. York residential equipment is not all that common
in my area, so from the model I couldn't tell you off the top of my head
which yours is likely to have. How old is the furnace?

20 years old. I've been trying to find a parts diagram without any
luck. I suppose they don't really want you mucking about in there.
But its got to be a big old industrial part. If it's a time delay on
pwb, then, damn, $$$$$ I suppose.

On Jan 27, 9:24*pm, okey wrote:
On Jan 27, 9:14*pm, (Lp1331 1p1331) wrote:

The blower is controlled from the furnace, not the thermostat, when the
thermostat is set in the "auto" position for the fan. It either
controlled by a mechanical bi-metal thermostatic switch or by time delay
from a circuit board. York residential equipment is not all that common
in my area, so from the model I couldn't tell you off the top of my head
which yours is likely to have. How old is the furnace?

20 years old. *I've been trying to find a parts diagram without any
luck. *I suppose they don't really want you mucking about in there.
But its got to be a big old industrial part. *If it's a time delay on
pwb, then, damn, $$$$$ I suppose.

I found parts. Now I need a schematic.
http://www.heatingandcoolingwarehous...Parts_s/45.htm

"okey" wrote in message
...
The fire box is lighting but the furnace fan doesn't come on. Where
is the temp relay? I've got a York Stellar Plus, Model P1UDD12N09501A
with a Honeywell Chronotherm 3 stat.

I assume the whole circuit is in the furnace itself BUT it could be in
the stat as well. I know I can turn the furnace fan hard on at the
thermostat. Maybe the York return a firebox temperature signal to the
C3.

You should have crossposted this to alt.hvac, so the alt.home.repair people
can see just how sociopathic and stupid the alt.hvac crowd really is. You
won't get an ounce of help from those assholes, unless being told to go ****
yourself is helpful.

Here's what I would do if I couldn't sleuth stuff out, or didn't want to
spend much money.
Wire in a relay (that can handle the blower current) to the gas valve, so
when the gas valve comes on, the blower comes on. Wahlah, nada mas.
If you really want to get fancy, spring for a time-delay relay, but that
will cost much more.

Note that with the blower *not* coming on now, you are heat-stressing the
innards, forcing it to shut off on high temp.
And what if the high-temp limit switch malfunctions?? New furnace!.

So this may not be the purist's solution, but it's a workable solution.
**** alt.hvac and the absolutely useless circle-jerking regulars over
there.. Feel free to cross post this.
--
EA

Thanks

On Jan 27, 10:41*pm, "Existential Angst"
wrote:
"okey" wrote in message

...

The fire box is lighting but the furnace fan doesn't come on. *Where
is the temp relay? *I've got a York Stellar Plus, Model P1UDD12N09501A
with a Honeywell Chronotherm 3 stat.

I assume the whole circuit is in the furnace itself BUT it could be in
the stat as well. I know I can turn the furnace fan hard on at the
thermostat. *Maybe the York return a firebox temperature signal to the
C3.

You should have crossposted this to alt.hvac, so the alt.home.repair people
can see just how sociopathic and stupid the alt.hvac crowd really is. *You
won't get an ounce of help from those assholes, unless being told to go ****
yourself is helpful.

Here's what I would do if I couldn't sleuth stuff out, or didn't want to
spend much money.
Wire in a relay (that can handle the blower current) to the gas valve, so
when the gas valve comes on, the blower comes on. *Wahlah, nada mas.
If you really want to get fancy, spring for a time-delay relay, but that
will cost much more.

Note that with the blower *not* coming on now, you are heat-stressing the
innards, forcing it to shut off on high temp.
And what if the high-temp limit switch malfunctions?? *New furnace!.

So this may not be the purist's solution, but it's a workable solution.
**** alt.hvac and the absolutely useless circle-jerking regulars over
there.. *Feel free to cross post this.
--
EA



Thanks

"Wire in a relay...to the gas valve, so when the gas valve comes
on, the blower comes on."

And thus also goes off when the gas valve turns off. Read on, please.

"Note that with the blower *not* coming on now, you are heat-
stressing the innards"

And with the blower turning off as soon as the gas valve closes,
there's nothing to take away the residual heat, thus "heat-stressing
the innards" on the back end of the cycle instead of the front.

Granted, that's not as bad as triggering the high temp shutoff, but it
still not good for the furnace.

At best, the relay is a temporary fix that will shorten the life of
the furnace.

On Jan 27, 10:07*pm, okey wrote:
The fire box is lighting but the furnace fan doesn't come on. *Where
is the temp relay? *I've got a York Stellar Plus, Model P1UDD12N09501A
with a Honeywell Chronotherm 3 stat.

I assume the whole circuit is in the furnace itself BUT it could be in
the stat as well. I know I can turn the furnace fan hard on at the
thermostat. *Maybe the York return a firebox temperature signal to the
C3.

Thanks

I don't know about 20 YO furnaces since I went from a 40-plus YO to a
new furnace 5 years ago, so I'll just ask this question:

Did they still use the in-plenum limit-switches 20 years ago? You
know, the probe that hangs out in the plenum and turns the fan on and
off based on the air temp in the plenum?

I replaced the fan-limit switch twice in 15 years on my old furnace. A
couple of sheet metal screws, a few wire nuts and about a half hour's
work.

On Jan 27, 10:26*pm, DerbyDad03 wrote:
On Jan 27, 10:07*pm, okey wrote:

The fire box is lighting but the furnace fan doesn't come on. *Where
is the temp relay? *I've got a York Stellar Plus, Model P1UDD12N09501A
with a Honeywell Chronotherm 3 stat.

I assume the whole circuit is in the furnace itself BUT it could be in
the stat as well. I know I can turn the furnace fan hard on at the
thermostat. *Maybe the York return a firebox temperature signal to the
C3.

Thanks

I don't know about 20 YO furnaces since I went from a 40-plus YO to a
new furnace 5 years ago, so I'll just ask this question:

Did they still use the in-plenum limit-switches 20 years ago? You
know, the probe that hangs out in the plenum and turns the fan on and
off based on the air temp in the plenum?

I replaced the fan-limit switch twice in 15 years on my old furnace. A
couple of sheet metal screws, a few wire nuts and about a half hour's
work.

Exactly on target!!

Naah, don't need a schematic. Those controls are rather easy
to spot, if you know what you're looking at and looking for.
Did I end a sentence, a preposition with?

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


"okey"
wrote in message
...


I found parts. Now I need a schematic.
http://www.heatingandcoolingwarehous...Parts_s/45.htm

On Jan 27, 9:07*pm, okey wrote:
The fire box is lighting but the furnace fan doesn't come on. *Where
is the temp relay? *I've got a York Stellar Plus, Model P1UDD12N09501A
with a Honeywell Chronotherm 3 stat.

I assume the whole circuit is in the furnace itself BUT it could be in
the stat as well. I know I can turn the furnace fan hard on at the
thermostat. *Maybe the York return a firebox temperature signal to the
C3.

Thanks

Try www.heatinghelp.com post at "The Wall" for pros, post at alt.hvac
to get yrbutt reamed by Ho`s

When you replace a fan/limit switch, be SURE to read the instructions,
especially the part about breaking out the little jumper if it is a four
wire hookup as opposed to three BTDT-caused the smoke to leak out of
most of the 24 volt components.

On Jan 28, 11:39*am, "Existential Angst"
wrote:
"DerbyDad03" wrote in message

...
On Jan 28, 12:18 am, "Existential Angst"
wrote:





"DerbyDad03" wrote in message

....
On Jan 27, 10:41 pm, "Existential Angst"
wrote:

"okey" wrote in message

....

The fire box is lighting but the furnace fan doesn't come on. Where
is the temp relay? I've got a York Stellar Plus, Model P1UDD12N09501A
with a Honeywell Chronotherm 3 stat.

I assume the whole circuit is in the furnace itself BUT it could be in
the stat as well. I know I can turn the furnace fan hard on at the
thermostat. Maybe the York return a firebox temperature signal to the
C3.

You should have crossposted this to alt.hvac, so the alt.home.repair
people
can see just how sociopathic and stupid the alt.hvac crowd really is.
You
won't get an ounce of help from those assholes, unless being told to go
****
yourself is helpful.

Here's what I would do if I couldn't sleuth stuff out, or didn't want to
spend much money.
Wire in a relay (that can handle the blower current) to the gas valve,
so
when the gas valve comes on, the blower comes on. Wahlah, nada mas.
If you really want to get fancy, spring for a time-delay relay, but that
will cost much more.

Note that with the blower *not* coming on now, you are heat-stressing
the
innards, forcing it to shut off on high temp.
And what if the high-temp limit switch malfunctions?? New furnace!.

So this may not be the purist's solution, but it's a workable solution.

On Jan 28, 11:49*am, Jeff The Drunk wrote:
On Thu, 28 Jan 2010 11:39:14 -0500, "Existential Angst"
wrote:

Based on my limited experience with furnaces and from what I was told,
this is my understanding:

When I had my 40 YO Perfection furnace with a massive heat exchanger,
the blower would be delayed at startup to allow to heat exchanger/
plenum air to heat up to avoid spewing cold air from the registers.

On the back end of the heating cycle, the blower would remain on to
both use up the residual heat in the heat exchanger/plenum and protect
the heat exchanger from over heating.

Called a "differential". Fan/limit switch can be set to turn on at
whatever temp lets say 170F, and off at any temp let's say 100F.
If you wish a little warmer air on the off cycle increase to 110F.

Closed combustion He furnaces could be controlled by a timer since the
heat exchanger is in a more controlled environment. Traditional
open/forced combustion air furnaces not so controlled so it's better
to use a fan/limit switch which probes the temp right above the heat
exchanger on the inside., =

The new furnace is an HE unit, so I can't (don't know how to) adjust
the "timer" to have the blower come on or go off at a different time,
nor do I want to.

I assume the manufacturer got it right and I have no desire to
override their wishes. ;-)

The "mechanical" fan/limit switch were much easier for the user to
control.

I have seen furnace without blowers. It was totally
inefficient, and the gas bill was horrendus. But, I'm
guessing it would work with out electric.

There is some gravity circulation, if the furnace is below
the heated area.

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


"DerbyDad03" wrote in message
...


"Even with the gas valve on, wouldn't you need your
blower to get
heat?"

Heat rises. ;-)

I never had to actually use the feature (although I did try
it after
moving in) so I am just assuming that I would have had some
benefit I
had really needed it.

"Technology/progress seems to have the net result of
hamstringing
us more and more"

Maybe some, but I'm more than willing to give up a manual
gas valve to
keep all of the other technological advances that I take
advantage of,
like discussing furnaces with you.

I don't think this conversation woulf have been possible at
the time
my original gas valve was installed