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Boiler Shuts Down



 
 
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  #1  
Old March 6th 06, 07:24 PM posted to alt.home.repair
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Default Boiler Shuts Down

When the outside temps (I'm in upstate NY) get down to the teens and single
digits my boiler can't keep up with the heat loss. There is baseboard
cabinet (7 inch cabinet) running the entire perimeter of the first floor
exterior walls of the four rooms (each 13x13) the zone covers. The rooms
are 8' 9" and all walls are insulated to R-13. The windows are dbl
insulated glass and the basement ceiling below is insulated as well. The
heat pipes are also fully insulated in the basement. The boiler (oil fired
baseboard hot water 2 zone system) rated at 150,000 btu shuts down when it
reaches the 180 deg boiler/water temp. I've been told that the 180 deg is
the proper shut down. The thermostat calls for heat with a 2 degree drop in
temperature. Right now it only runs for about 10 minutes before it reaches
its 180 deg mark and then shuts down for about 15 mins. The result is a
net loss of room temperature especially at night of upwards of 6 to 8
degrees resulting in a room temp of 60 to 62 degrees by morning. If temps
go into the below zeros then the boiler never catrhches up even in the
daytime. So my question is what if anything can I do or have the oil
burner service company do to have the burner deliver heat for a longer
peiod. Your usual good input would be appreciated. Thanks. John


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  #2  
Old March 6th 06, 08:08 PM posted to alt.home.repair
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Default Boiler Shuts Down

John F. wrote:
When the outside temps (I'm in upstate NY) get down to the teens and single
digits my boiler can't keep up with the heat loss. There is baseboard
cabinet (7 inch cabinet) running the entire perimeter of the first floor
exterior walls of the four rooms (each 13x13) the zone covers. The rooms
are 8' 9" and all walls are insulated to R-13. The windows are dbl
insulated glass and the basement ceiling below is insulated as well. The
heat pipes are also fully insulated in the basement. The boiler (oil fired
baseboard hot water 2 zone system) rated at 150,000 btu shuts down when it
reaches the 180 deg boiler/water temp. I've been told that the 180 deg is
the proper shut down. The thermostat calls for heat with a 2 degree drop in
temperature. Right now it only runs for about 10 minutes before it reaches
its 180 deg mark and then shuts down for about 15 mins. The result is a
net loss of room temperature especially at night of upwards of 6 to 8
degrees resulting in a room temp of 60 to 62 degrees by morning. If temps
go into the below zeros then the boiler never catrhches up even in the
daytime. So my question is what if anything can I do or have the oil
burner service company do to have the burner deliver heat for a longer
peiod. Your usual good input would be appreciated. Thanks. John


It doesn't sound like a burner/boiler problem to me.

If the boiler is easily maintaining ~180F, the problem
seems to be that the circ pump and radiation can't *remove*
enough BTU from the water.

For example: Although the boiler has a rating of 150,000BTU/Hr,
let's say that the rads can only unload 50,000BTU/Hr.
The burner would only need to run 1/3 the time .

But the house needs 100,000BTU/Hr in coldest weather (example).
The boiler *could* produce that easily, but the rads can't
pump the BTU's into the house fast enough. So...house gets cold.

You may have to have someone re-calculate the fin-tube area
required and/or the pump capacity to deliver enough water velocity.

Jim
  #3  
Old March 6th 06, 08:39 PM posted to alt.home.repair
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Default Boiler Shuts Down

You can raise the boiler temp to 190, the circulator pump could be weak,
but it doesnt sound right, are the radiators extremely hot, have they
been bled of air, does the circulator pump continue to run when the
boiler is not firing and thermostat is not satisfied, it should. How
many sq ft and what is your attic insulation. Are the baseboards
retrofit.

  #4  
Old March 6th 06, 11:25 PM posted to alt.home.repair
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Default Boiler Shuts Down

If I'm reading your post correctly, it sounds like the entire system shuts
down when the boiler reaches 180, which it shouldn't. You have two zones and
I don't know if they are zone valves with one circulator or two circulators
but, in either case, the thermostat should control the circulation of the
hot water, and should keep it circulating until the thermostat is satisfied.



"John F." wrote in message
...
When the outside temps (I'm in upstate NY) get down to the teens and
single digits my boiler can't keep up with the heat loss. There is
baseboard cabinet (7 inch cabinet) running the entire perimeter of the
first floor exterior walls of the four rooms (each 13x13) the zone
covers. The rooms are 8' 9" and all walls are insulated to R-13. The
windows are dbl insulated glass and the basement ceiling below is
insulated as well. The heat pipes are also fully insulated in the
basement. The boiler (oil fired baseboard hot water 2 zone system)
rated at 150,000 btu shuts down when it reaches the 180 deg boiler/water
temp. I've been told that the 180 deg is the proper shut down. The
thermostat calls for heat with a 2 degree drop in temperature. Right now
it only runs for about 10 minutes before it reaches its 180 deg mark and
then shuts down for about 15 mins. The result is a net loss of room
temperature especially at night of upwards of 6 to 8 degrees resulting in
a room temp of 60 to 62 degrees by morning. If temps go into the below
zeros then the boiler never catrhches up even in the daytime. So my
question is what if anything can I do or have the oil burner service
company do to have the burner deliver heat for a longer peiod. Your usual
good input would be appreciated. Thanks. John



  #5  
Old March 6th 06, 11:57 PM posted to alt.home.repair
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Default Boiler Shuts Down

John, it can be tough to tell on some units if the circulator is
running, or not.

If the thermostat is closed, the circ pump should be running, and the
burner itself will run or not as needed to keep the water in the boiler
hot.

The only thing I can add to the replies here is to make sure the
thermostat doesn't have its anticipator set to give absurdly short
cycles.

Don't know how to check it on an electronic thermostat, but on a good
ol' mechanical one remove the cover and look for a little dial in the
middle of the metal coil, and see if its labeled.
If its set far into the 'shorter cycles' zone this could cause the
thermostat to shut off too quickly.
This is actually a little heater that is adjusted such that the
thermostat shuts off as the proper temp is approach so the temp doesn't
overshoot by a wide margin.

Dave

  #6  
Old March 7th 06, 12:28 AM posted to alt.home.repair
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Default Boiler Shuts Down

The radiatorshave been purged they are not retrofits) are pretty hot but
they don't seem excessively hot; don't know if circulator keeps running but
will try and check that. The thing about the circulators though is that
they are the small water lubricated type. Many years ago I had these same
type and they would fail if they weren't used or run periodically during no
heating months. Attic insul is approx. r-25. The upstairs is very warm.
Thanks.


"m Ransley" wrote in message
...
You can raise the boiler temp to 190, the circulator pump could be weak,
but it doesnt sound right, are the radiators extremely hot, have they
been bled of air, does the circulator pump continue to run when the
boiler is not firing and thermostat is not satisfied, it should. How
many sq ft and what is your attic insulation. Are the baseboards
retrofit.



  #7  
Old March 7th 06, 12:32 AM posted to alt.home.repair
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Posts: n/a
Default Boiler Shuts Down

Thanks for input. That cicrulator is sounding supicious now that it has
come up.
I'm sure the burner people will not like it as my conract includes
circulator replacement. Is there some easily done test without dismantling
system to see if the pump is weak or really bad?


"Speedy Jim" wrote in message
. com...
John F. wrote:
When the outside temps (I'm in upstate NY) get down to the teens and
single digits my boiler can't keep up with the heat loss. There is
baseboard cabinet (7 inch cabinet) running the entire perimeter of the
first floor exterior walls of the four rooms (each 13x13) the zone
covers. The rooms are 8' 9" and all walls are insulated to R-13. The
windows are dbl insulated glass and the basement ceiling below is
insulated as well. The heat pipes are also fully insulated in the
basement. The boiler (oil fired baseboard hot water 2 zone system)
rated at 150,000 btu shuts down when it reaches the 180 deg boiler/water
temp. I've been told that the 180 deg is the proper shut down. The
thermostat calls for heat with a 2 degree drop in temperature. Right now
it only runs for about 10 minutes before it reaches its 180 deg mark and
then shuts down for about 15 mins. The result is a net loss of room
temperature especially at night of upwards of 6 to 8 degrees resulting in
a room temp of 60 to 62 degrees by morning. If temps go into the below
zeros then the boiler never catrhches up even in the daytime. So my
question is what if anything can I do or have the oil burner service
company do to have the burner deliver heat for a longer peiod. Your
usual good input would be appreciated. Thanks. John

It doesn't sound like a burner/boiler problem to me.

If the boiler is easily maintaining ~180F, the problem
seems to be that the circ pump and radiation can't *remove*
enough BTU from the water.

For example: Although the boiler has a rating of 150,000BTU/Hr,
let's say that the rads can only unload 50,000BTU/Hr.
The burner would only need to run 1/3 the time .

But the house needs 100,000BTU/Hr in coldest weather (example).
The boiler *could* produce that easily, but the rads can't
pump the BTU's into the house fast enough. So...house gets cold.

You may have to have someone re-calculate the fin-tube area
required and/or the pump capacity to deliver enough water velocity.

Jim



  #8  
Old March 7th 06, 03:10 PM posted to alt.home.repair
external usenet poster
 
Posts: n/a
Default Boiler Shuts Down

There are 2 zones each with it's own circulator and I just noticed up in
the insulation near the boiler on the return side there is a non-electric
flow control valve. If by "the entire system shuts down" you mean the
boiler that is correct.I believe I detect the circulator for the zone
involved running when I place my hand on it. When the boiler temp reaches
180+ boiler shots off and comes back on about 10-15 minutes later as room
temp causes the thermostat to still call for heat. I'm beginning to believe
that the total run of the heat loopis way too long. I don't know what
limitations there should be. A quick calclation gives me 200 plus feet some
of it is 1 and 1/4 inch pipe. The more I examine everything the more
questions I have. Time to make a call. Appeciate exeryone's expertise.
John


"RBM" rbm2(remove wrote in message
...
If I'm reading your post correctly, it sounds like the entire system shuts
down when the boiler reaches 180, which it shouldn't. You have two zones
and I don't know if they are zone valves with one circulator or two
circulators but, in either case, the thermostat should control the
circulation of the hot water, and should keep it circulating until the
thermostat is satisfied.



"John F." wrote in message
...
When the outside temps (I'm in upstate NY) get down to the teens and
single digits my boiler can't keep up with the heat loss. There is
baseboard cabinet (7 inch cabinet) running the entire perimeter of the
first floor exterior walls of the four rooms (each 13x13) the zone
covers. The rooms are 8' 9" and all walls are insulated to R-13. The
windows are dbl insulated glass and the basement ceiling below is
insulated as well. The heat pipes are also fully insulated in the
basement. The boiler (oil fired baseboard hot water 2 zone system)
rated at 150,000 btu shuts down when it reaches the 180 deg boiler/water
temp. I've been told that the 180 deg is the proper shut down. The
thermostat calls for heat with a 2 degree drop in temperature. Right now
it only runs for about 10 minutes before it reaches its 180 deg mark and
then shuts down for about 15 mins. The result is a net loss of room
temperature especially at night of upwards of 6 to 8 degrees resulting in
a room temp of 60 to 62 degrees by morning. If temps go into the below
zeros then the boiler never catrhches up even in the daytime. So my
question is what if anything can I do or have the oil burner service
company do to have the burner deliver heat for a longer peiod. Your
usual good input would be appreciated. Thanks. John





  #9  
Old March 8th 06, 03:10 AM posted to alt.home.repair
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Posts: n/a
Default Boiler Shuts Down


"John F." wrote in message
...
The radiatorshave been purged they are not retrofits) are pretty hot but
they don't seem excessively hot; don't know if circulator keeps running
but will try and check that. The thing about the circulators though is
that they are the small water lubricated type. Many years ago I had these
same type and they would fail if they weren't used or run periodically
during no heating months. Attic insul is approx. r-25. The upstairs is
very warm. Thanks.


Circulators do fail and they are about $50 to $70 to replace (for the
parts). One thing that I did not see was if the problem was new or if it
has always been that way. If it is new, I'd suspect poor circulation. If
it has always had lack of heating, I'd suspect poor design of the baseboard
setup. There may be not enough finned sections in each room.


  #10  
Old March 8th 06, 04:45 PM posted to alt.home.repair
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Posts: n/a
Default Boiler Shuts Down


"Edwin Pawlowski" wrote in message
m...

"John F." wrote in message
...
The radiatorshave been purged they are not retrofits) are pretty hot
but they don't seem excessively hot; don't know if circulator keeps
running but will try and check that. The thing about the circulators
though is that they are the small water lubricated type. Many years ago I
had these same type and they would fail if they weren't used or run
periodically during no heating months. Attic insul is approx. r-25. The
upstairs is very warm. Thanks.


Circulators do fail and they are about $50 to $70 to replace (for the
parts). One thing that I did not see was if the problem was new or if it
has always been that way. If it is new, I'd suspect poor circulation. If
it has always had lack of heating, I'd suspect poor design of the
baseboard setup. There may be not enough finned sections in each room.


Have been in the house only 2 years. I became vaguely aware of the heat
loss last heating season but can't say I was aware of the frequency of
boiler on/off situation. There are no walls left on which to put finned
sections. As I mentioned in one of my replies there is some 200 feet and
more of heat loop but only about 100 feet of that is actual heat fin. The
rest is insulated piping in the unheated basement. I wonder if this length
of run is too long or does it matter. I'm wondering if cutting into the
current run and adding another zone would solve the problem assuming it's
not a cirulator problem.


 




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