I just installed a new pressure tank in my hydronic system. It said it
was pre-charged to 12 psi. When refilling the system I think I did a
good job of eliminating the air as there is little noise when the
circulator is running, plus there is a Spirovent installed.
I like to keep the system pressure at between 15 and 20 lbs. but I
noticed the pressure seems to drop back to 0 quite often. Then when I
add water, the pressure seems to rise very quickly. The only thing I
can think of is that I have no air cushion.
I did not check the tank pressure before installing.
What is wrong and what should I do? I'd like not to have to drain
the system again.
Thanks in advance.
Frank

Just heard a loud "whoosh" and the pressure has gone to zero again.
Nothing is leaking. Add that to the clues.






On Wed, 30 Dec 2009 01:25:50 -0500, frank1492
wrote:

I just installed a new pressure tank in my hydronic system. It said it
was pre-charged to 12 psi. When refilling the system I think I did a
good job of eliminating the air as there is little noise when the
circulator is running, plus there is a Spirovent installed.
I like to keep the system pressure at between 15 and 20 lbs. but I
noticed the pressure seems to drop back to 0 quite often. Then when I
add water, the pressure seems to rise very quickly. The only thing I
can think of is that I have no air cushion.
I did not check the tank pressure before installing.
What is wrong and what should I do? I'd like not to have to drain
the system again.
Thanks in advance.
Frank

On Dec 30, 12:38*am, frank1492 wrote:
Just heard a loud "whoosh" and the pressure has gone to zero again.
Nothing is leaking. Add that to the clues.

On Wed, 30 Dec 2009 01:25:50 -0500, frank1492
wrote:



I just installed a new pressure tank in my hydronic system. It said it
was pre-charged to 12 psi. When refilling the system I think I did a
good job of eliminating the air as there is little noise when the
circulator is running, plus there is a Spirovent installed.
* I like to keep the system pressure at between 15 *and 20 lbs. but I
noticed the pressure seems to drop back to 0 quite often. Then when I
add water, the pressure seems to rise very quickly. The only thing I
can think of is that I have no air cushion.
* I did not check the tank pressure before installing.
*What is wrong and what should I do? I'd like not to have to drain
the system again.
*Thanks in advance.
* * * Frank- Hide quoted text -

- Show quoted text -

Do you mean the pressure gauge on the boiler, how much does pressure
change from high to low, is your house 1 or 3 story, with radiators I
can not go to zero unless my system is empty, to keep my 3rd floor
radiator full of water I need near 12-15lb and only increase a few
pounds as water heats. Maybe a bad gauge, what was wrong with old
tank, to small a tank and pressure can jump when heated and be
erratic, when our boiler was changed the attic expansion tank was
eliminated and a basement tank installed, but we eventualy needed two
tanks as one was to small and pressure jumped 15-20lb with every
heating cycle. www.heatinghelp.com "the wall" is where boiler pros
are.

Sorry I wasn't clear. This is a *closed leg* with a circulator,
pressure tank and gauge. (Runs through a heat exhanger or tankless
heater, heat supplied by circulating steam boiler water- old boiler.)
Has always worked perfectly with identical components until the old
tank sprung a leak. I realize the ideal situation would be to have a
pressure reducing valve and backflow preventer permanently attached
but letting in the water manually on rare occasions has always worked
fine.
So the only thing that's new is the new pressure tank, same
capacity, style as before. As I say, when you let water in now, the
pressure rises very quickly as if there was no air cushion.








On Wed, 30 Dec 2009 03:06:45 -0800 (PST), ransley
wrote:

On Dec 30, 12:38*am, frank1492 wrote:
Just heard a loud "whoosh" and the pressure has gone to zero again.
Nothing is leaking. Add that to the clues.

On Wed, 30 Dec 2009 01:25:50 -0500, frank1492
wrote:



I just installed a new pressure tank in my hydronic system. It said it
was pre-charged to 12 psi. When refilling the system I think I did a
good job of eliminating the air as there is little noise when the
circulator is running, plus there is a Spirovent installed.
* I like to keep the system pressure at between 15 *and 20 lbs. but I
noticed the pressure seems to drop back to 0 quite often. Then when I
add water, the pressure seems to rise very quickly. The only thing I
can think of is that I have no air cushion.
* I did not check the tank pressure before installing.
*What is wrong and what should I do? I'd like not to have to drain
the system again.
*Thanks in advance.
* * * Frank- Hide quoted text -

- Show quoted text -

Do you mean the pressure gauge on the boiler, how much does pressure
change from high to low, is your house 1 or 3 story, with radiators I
can not go to zero unless my system is empty, to keep my 3rd floor
radiator full of water I need near 12-15lb and only increase a few
pounds as water heats. Maybe a bad gauge, what was wrong with old
tank, to small a tank and pressure can jump when heated and be
erratic, when our boiler was changed the attic expansion tank was
eliminated and a basement tank installed, but we eventualy needed two
tanks as one was to small and pressure jumped 15-20lb with every
heating cycle. www.heatinghelp.com "the wall" is where boiler pros
are.

In article , frank1492 wrote:
Sorry I wasn't clear. This is a *closed leg* with a circulator,
pressure tank and gauge. (Runs through a heat exhanger or tankless
heater, heat supplied by circulating steam boiler water- old boiler.)
Has always worked perfectly with identical components until the old
tank sprung a leak. I realize the ideal situation would be to have a
pressure reducing valve and backflow preventer permanently attached
but letting in the water manually on rare occasions has always worked
fine.
So the only thing that's new is the new pressure tank, same
capacity, style as before. As I say, when you let water in now, the
pressure rises very quickly as if there was no air cushion.

That suggests strongly that there is not in fact an air cushion. By any chance
is there a valve between the gauge and the air tank? And is that valve open?








On Wed, 30 Dec 2009 03:06:45 -0800 (PST), ransley
wrote:

On Dec 30, 12:38*am, frank1492 wrote:
Just heard a loud "whoosh" and the pressure has gone to zero again.
Nothing is leaking. Add that to the clues.

On Wed, 30 Dec 2009 01:25:50 -0500, frank1492
wrote:



I just installed a new pressure tank in my hydronic system. It said it
was pre-charged to 12 psi. When refilling the system I think I did a
good job of eliminating the air as there is little noise when the
circulator is running, plus there is a Spirovent installed.
* I like to keep the system pressure at between 15 *and 20 lbs. but I
noticed the pressure seems to drop back to 0 quite often. Then when I
add water, the pressure seems to rise very quickly. The only thing I
can think of is that I have no air cushion.
* I did not check the tank pressure before installing.
*What is wrong and what should I do? I'd like not to have to drain
the system again.
*Thanks in advance.
* * * Frank- Hide quoted text -

- Show quoted text -

Do you mean the pressure gauge on the boiler, how much does pressure
change from high to low, is your house 1 or 3 story, with radiators I
can not go to zero unless my system is empty, to keep my 3rd floor
radiator full of water I need near 12-15lb and only increase a few
pounds as water heats. Maybe a bad gauge, what was wrong with old
tank, to small a tank and pressure can jump when heated and be
erratic, when our boiler was changed the attic expansion tank was
eliminated and a basement tank installed, but we eventualy needed two
tanks as one was to small and pressure jumped 15-20lb with every
heating cycle. www.heatinghelp.com "the wall" is where boiler pros
are.

The tank is on a tee in the loop and the gauge is on a separate tee.
There is no valve between gauge and air tank. I know, it's puzzling. I
really thought someone would have a quick answer. Of course I can
always disassemble everything and start over, but first I guess I
should ascertain if there is air in the tank at all.
It seems I should mention something: When filling the system, I
accidentally let the pressure get to about 80 lbs, but *only*
momentarily. The max tank pressure is supposed to be 75 lbs. I know
it's a stretch but any chance the bladder was damaged?




On Wed, 30 Dec 2009 17:38:47 GMT, (Doug Miller)
wrote:

In article , frank1492 wrote:
Sorry I wasn't clear. This is a *closed leg* with a circulator,
pressure tank and gauge. (Runs through a heat exhanger or tankless
heater, heat supplied by circulating steam boiler water- old boiler.)
Has always worked perfectly with identical components until the old
tank sprung a leak. I realize the ideal situation would be to have a
pressure reducing valve and backflow preventer permanently attached
but letting in the water manually on rare occasions has always worked
fine.
So the only thing that's new is the new pressure tank, same
capacity, style as before. As I say, when you let water in now, the
pressure rises very quickly as if there was no air cushion.

That suggests strongly that there is not in fact an air cushion. By any chance
is there a valve between the gauge and the air tank? And is that valve open?








On Wed, 30 Dec 2009 03:06:45 -0800 (PST), ransley
wrote:

On Dec 30, 12:38*am, frank1492 wrote:
Just heard a loud "whoosh" and the pressure has gone to zero again.
Nothing is leaking. Add that to the clues.

On Wed, 30 Dec 2009 01:25:50 -0500, frank1492
wrote:



I just installed a new pressure tank in my hydronic system. It said it
was pre-charged to 12 psi. When refilling the system I think I did a
good job of eliminating the air as there is little noise when the
circulator is running, plus there is a Spirovent installed.
* I like to keep the system pressure at between 15 *and 20 lbs. but I
noticed the pressure seems to drop back to 0 quite often. Then when I
add water, the pressure seems to rise very quickly. The only thing I
can think of is that I have no air cushion.
* I did not check the tank pressure before installing.
*What is wrong and what should I do? I'd like not to have to drain
the system again.
*Thanks in advance.
* * * Frank- Hide quoted text -

- Show quoted text -

Do you mean the pressure gauge on the boiler, how much does pressure
change from high to low, is your house 1 or 3 story, with radiators I
can not go to zero unless my system is empty, to keep my 3rd floor
radiator full of water I need near 12-15lb and only increase a few
pounds as water heats. Maybe a bad gauge, what was wrong with old
tank, to small a tank and pressure can jump when heated and be
erratic, when our boiler was changed the attic expansion tank was
eliminated and a basement tank installed, but we eventualy needed two
tanks as one was to small and pressure jumped 15-20lb with every
heating cycle. www.heatinghelp.com "the wall" is where boiler pros
are.

On Dec 30, 11:07*pm, frank1492 wrote:

snip

*It seems I should mention something: When filling the system, I
accidentally let the pressure get to about 80 lbs, but *only*
momentarily. The max tank pressure is supposed to be 75 lbs. I know
it's a stretch but any chance the bladder was damaged?

snip

Bingo!

Joe

is these system steam or water

"Joe" wrote in message
...
On Dec 30, 11:07 pm, frank1492 wrote:

snip

It seems I should mention something: When filling the system, I
accidentally let the pressure get to about 80 lbs, but *only*
momentarily. The max tank pressure is supposed to be 75 lbs. I know
it's a stretch but any chance the bladder was damaged?

snip

Bingo!

Joe

Grumpy wrote:
is these system steam or water

"Joe" wrote in message
...
On Dec 30, 11:07 pm, frank1492 wrote:

snip

It seems I should mention something: When filling the system, I
accidentally let the pressure get to about 80 lbs, but *only*
momentarily. The max tank pressure is supposed to be 75 lbs. I know
it's a stretch but any chance the bladder was damaged?

snip

Bingo!

Joe

It would not be steam in a residence with that pressure. Now would steam
have an expansion tank anyway.

you got point Ed but then I have never hear of any boiler that goes over 30
psi
in residential use, ideal pressure is around 15 psi. So where 80 and 75 psi
coming from

"Ed Pawlowski" wrote in message
...
Grumpy wrote:
is these system steam or water

"Joe" wrote in message
...
On Dec 30, 11:07 pm, frank1492 wrote:

snip

It seems I should mention something: When filling the system, I
accidentally let the pressure get to about 80 lbs, but *only*
momentarily. The max tank pressure is supposed to be 75 lbs. I know
it's a stretch but any chance the bladder was damaged?

snip

Bingo!

Joe

It would not be steam in a residence with that pressure. Now would steam
have an expansion tank anyway.




--- news://freenews.netfront.net/ - complaints: ---

Grumpy wrote:
you got point Ed but then I have never hear of any boiler that goes
over 30 psi
in residential use, ideal pressure is around 15 psi. So where 80 and
75 psi coming from

Only way would be for a defective fill/pressure regulator valve allowing
full incoming pressure. Or, he is making steam in that water boiler because
it is not circulating and shutting down the burner.

I think that he should call pro.

"Ed Pawlowski" wrote in message
...
Grumpy wrote:
you got point Ed but then I have never hear of any boiler that goes
over 30 psi
in residential use, ideal pressure is around 15 psi. So where 80 and
75 psi coming from

Only way would be for a defective fill/pressure regulator valve allowing
full incoming pressure. Or, he is making steam in that water boiler
because it is not circulating and shutting down the burner.