Hi,

I've got a new Heil 1-stage upflow furnace (installed last Apr.) in
my little brick bungalow in the midwest.

The heat cycle is something like:

T-stat calls for heat
LIttle fan sucks fumes out.
Heat element gets power.
Gas valve opens, burners fire
Blower kicks in
Gas valve closes
Blower kicks out

Occasionally and only intermittently, after the heat cycle
has been complete for some time, the blower will run for
about 10 seconds and then shut down.

I can't find anything that explains this in the Sequence of Ops
documentation.

Any clue?

TIA,
Puddin'

Pease pudding hot,
Pease pudding cold,
Pease pudding in the pot
Nine days old ...

"Puddin' Man" wrote in message
news

Hi,

I've got a new Heil 1-stage upflow furnace (installed last Apr.) in
my little brick bungalow in the midwest.

The heat cycle is something like:

T-stat calls for heat
LIttle fan sucks fumes out.
Heat element gets power.
Gas valve opens, burners fire
Blower kicks in
Gas valve closes
Blower kicks out

Occasionally and only intermittently, after the heat cycle
has been complete for some time, the blower will run for
about 10 seconds and then shut down.

The furnace fan is designed to kick in when the heat exchanger reaches a
certain temperature. What is happening in your case is the fan is not
running long enough to cool the heat exchanger after the heat cycle. The
residual heat in th exchanger tells your fan to kick back in to cool it down
for those 10 or so seconds. You have to set the fan to run longer after the
heat cycle and this will prevent the fan from kicking back in. There is an
adjustment in the furnace.

On Mon, 11 Dec 2006 14:21:18 -0600, "Jimi"
wrote:


"Puddin' Man" wrote in message
news

Hi,

I've got a new Heil 1-stage upflow furnace (installed last Apr.) in
my little brick bungalow in the midwest.

The heat cycle is something like:

T-stat calls for heat
LIttle fan sucks fumes out.
Heat element gets power.
Gas valve opens, burners fire
Blower kicks in
Gas valve closes
Blower kicks out

Occasionally and only intermittently, after the heat cycle
has been complete for some time, the blower will run for
about 10 seconds and then shut down.

The furnace fan is designed to kick in when the heat exchanger reaches a
certain temperature. What is happening in your case is the fan is not
running long enough to cool the heat exchanger after the heat cycle. The
residual heat in th exchanger tells your fan to kick back in to cool it down
for those 10 or so seconds. You have to set the fan to run longer after the
heat cycle and this will prevent the fan from kicking back in. There is an
adjustment in the furnace.

I think you've nailed it.

I somehow expected a senser to shut fan down when the HE cooled
to a certain temp.

There's a jumper for timed shut-off of fan: 30, 60, 100, etc
secs. 'Twas set to 60.

I set it up to 100. If it blows too much cool air, I guess
I'll go back to 60. It wasn't re-cycling very often (maybe
1 heat cycle in 10) and I doubt it'd hurt anything.

Mostly I just needed to know what was going on. Might hafta
maintain/repair this unit for many, many years.

Much Thanks,
Puddin'

Pease pudding hot,
Pease pudding cold,
Pease pudding in the pot
Nine days old ...

"Puddin' Man" wrote in message
...
On Mon, 11 Dec 2006 14:21:18 -0600, "Jimi"
wrote:


"Puddin' Man" wrote in message
news

Hi,

I've got a new Heil 1-stage upflow furnace (installed last Apr.) in
my little brick bungalow in the midwest.

The heat cycle is something like:

T-stat calls for heat
LIttle fan sucks fumes out.
Heat element gets power.
Gas valve opens, burners fire
Blower kicks in
Gas valve closes
Blower kicks out

Occasionally and only intermittently, after the heat cycle
has been complete for some time, the blower will run for
about 10 seconds and then shut down.

The furnace fan is designed to kick in when the heat exchanger reaches
a
certain temperature. What is happening in your case is the fan is not
running long enough to cool the heat exchanger after the heat cycle. The
residual heat in th exchanger tells your fan to kick back in to cool it
down
for those 10 or so seconds. You have to set the fan to run longer after
the
heat cycle and this will prevent the fan from kicking back in. There is an
adjustment in the furnace.

I think you've nailed it.

Much Thanks,
Puddin'

Glad I was able to help. I had a furnace guy show me the same thing during
a yearly check up as I was having the same problem.....Jimi

On Mon, 11 Dec 2006 16:43:18 GMT, Puddin' Man
wrote:


Hi,

I've got a new Heil 1-stage upflow furnace (installed last Apr.) in
my little brick bungalow in the midwest.

The heat cycle is something like:

T-stat calls for heat
LIttle fan sucks fumes out.
Heat element gets power.
Gas valve opens, burners fire
Blower kicks in
Gas valve closes
Blower kicks out

Occasionally and only intermittently, after the heat cycle
has been complete for some time, the blower will run for
about 10 seconds and then shut down.

I can't find anything that explains this in the Sequence of Ops
documentation.

Any clue?

TIA,
Puddin'

Pease pudding hot,
Pease pudding cold,
Pease pudding in the pot
Nine days old ...

Hire a professional

New unit, under warranty, why are you messing with it

m Ransley wrote:
New unit, under warranty, why are you messing with it


Maybe because changing how long the blower stays on after the burner
shuts off is a setting, not a warranty issue? And that he fixed it be
changing an obvious jumper setting instead of paying for a service call.

On 12 Dec 2006 06:59:52 -0800, wrote:


m Ransley wrote:
New unit, under warranty, why are you messing with it

You've heard it befo "Inquiring Minds Wanna Know!"

Maybe because changing how long the blower stays on after the burner
shuts off is a setting, not a warranty issue? And that he fixed it be
changing an obvious jumper setting instead of paying for a service call.

They prolly woulda come out under the warranty.

Idea was to analyze heat op. cycle, figger what it
was doing, make any adjustments my po' self.
Woulda worked if they hadn't scattered the info
on settings across several manuals.

So I had to ask a Q here, I got an answer, found
the relevant info, and fixed it. Acceptable result.

If there's a serious malfunction, I'll call service
under warranty. Otherwise I'll fix it myself, which
is what'll happen when it's out of warranty.

Puddin'

Pease pudding hot,
Pease pudding cold,
Pease pudding in the pot
Nine days old ...

"Puddin' Man" wrote in message
...
On 12 Dec 2006 06:59:52 -0800, wrote:


m Ransley wrote:
New unit, under warranty, why are you messing with it

You've heard it befo "Inquiring Minds Wanna Know!"

Maybe because changing how long the blower stays on after the burner
shuts off is a setting, not a warranty issue? And that he fixed it be
changing an obvious jumper setting instead of paying for a service call.

They prolly woulda come out under the warranty.

Idea was to analyze heat op. cycle, figger what it
was doing, make any adjustments my po' self.
Woulda worked if they hadn't scattered the info
on settings across several manuals.

So I had to ask a Q here, I got an answer, found
the relevant info, and fixed it. Acceptable result.

If there's a serious malfunction, I'll call service
under warranty. Otherwise I'll fix it myself, which
is what'll happen when it's out of warranty.

Puddin'

Pease pudding hot,
Pease pudding cold,
Pease pudding in the pot
Nine days old ...

I gotta ask....How did you come up with that Nick name and the
signature...is it some sort of nursery rhyme? Jimi