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Boiler Temperature Setting Question n2ah 12-15-2006
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Posted by on December 15, 2006, 8:32 am


The thermostat settings currently are LO = 130F and HI = 160F. But the
furnace comes on when the water temperature guage reads 160F, and shuts
off when the temperature gauge reads 185F. The temperature gauge
continues to climb to about 190F after the furnace shuts off, due (I
think) to the lag time for the water temp to stabilize.

Does this sound normal? Why doesn't the temperature gauge track with
the thermostat settings? Should I lower the settings?

This is a Burnham V83 boiler in an oil / hot water heating system with
a coil inside the boiler for hot water.

Thanks,
Art Harris


Posted by Pj on December 15, 2006, 11:15 am



n2ah@hotmail.com wrote:
> The thermostat settings currently are LO = 130F and HI = 160F. But the
> furnace comes on when the water temperature guage reads 160F, and shuts
> off when the temperature gauge reads 185F. The temperature gauge
> continues to climb to about 190F after the furnace shuts off, due (I
> think) to the lag time for the water temp to stabilize.
>
> Does this sound normal? Why doesn't the temperature gauge track with
> the thermostat settings? Should I lower the settings?
>
> This is a Burnham V83 boiler in an oil / hot water heating system with
> a coil inside the boiler for hot water.
>
> Thanks,
> Art Harris

I'm going to take a guess at this one since without additional
information it's too difficult to diagnose the problem: The thermostat
that controls normal on-off functions isn't working and the furnace
stays on until the temperature reaches the "fail safe" setting for
shutdown. In other words, the safety device that prevents the boiler
from popping the pressure relief valve or blowing it's seams is
activating; not a good choice for shuting down the system.

Call the service company that installed the furnace.

Pj


Posted by shebaaa on December 15, 2006, 11:53 am


n2ah@hotmail.com wrote:
> The thermostat settings currently are LO = 130F and HI = 160F. But the
> furnace comes on when the water temperature guage reads 160F, and shuts
> off when the temperature gauge reads 185F. The temperature gauge
> continues to climb to about 190F after the furnace shuts off, due (I
> think) to the lag time for the water temp to stabilize.
>
> Does this sound normal? Why doesn't the temperature gauge track with
> the thermostat settings? Should I lower the settings?
>
> This is a Burnham V83 boiler in an oil / hot water heating system with
> a coil inside the boiler for hot water.
>
> Thanks,
> Art Harris
>
Aquastats get off with age and the settings are then adjusted by
Temperature/pressure gauge and not by numbers on the Aquastat. The on
and off Temps you say it is cycling at are fine especially if you have a
tankless coil

Posted by Paul Flansburg on December 15, 2006, 1:41 pm



n2ah@hotmail.com wrote:
> The thermostat settings currently are LO = 130F and HI = 160F. But the
> furnace comes on when the water temperature guage reads 160F, and shuts
> off when the temperature gauge reads 185F. The temperature gauge
> continues to climb to about 190F after the furnace shuts off, due (I
> think) to the lag time for the water temp to stabilize.
>
> Does this sound normal? Why doesn't the temperature gauge track with
> the thermostat settings? Should I lower the settings?
>
> This is a Burnham V83 boiler in an oil / hot water heating system with
> a coil inside the boiler for hot water.
>
> Thanks,
> Art Harris

All wrong answers......Take a look at the aquastat. This is NOT a
thermostat, but an Aquastat for maintaining the operating temperature
of the boiler. There should be 3 dials on the aquastat. Lo and hi
cutoff and the differential setting. It sounds like the diferential
dial setting is set at 25. This is not a problem!!! Figure out which
manufacturer you have, most are Honeywell, and do a google on the
manufac. and model number. All of your questions will be answered once
you find the correct document.

-paul


Posted by on December 16, 2006, 3:18 pm


Paul Flansburg wrote:
> n2ah@hotmail.com wrote:
> > The thermostat settings currently are LO = 130F and HI = 160F. But the
> > furnace comes on when the water temperature guage reads 160F, and shuts
> > off when the temperature gauge reads 185F. The temperature gauge
> > continues to climb to about 190F after the furnace shuts off, due (I
> > think) to the lag time for the water temp to stabilize.
> >
> > Does this sound normal? Why doesn't the temperature gauge track with
> > the thermostat settings? Should I lower the settings?
> >
> > This is a Burnham V83 boiler in an oil / hot water heating system with
> > a coil inside the boiler for hot water.
> >
> All wrong answers......Take a look at the aquastat. This is NOT a
> thermostat, but an Aquastat for maintaining the operating temperature
> of the boiler. There should be 3 dials on the aquastat. Lo and hi
> cutoff and the differential setting. It sounds like the diferential
> dial setting is set at 25. This is not a problem!!! Figure out which
> manufacturer you have, most are Honeywell, and do a google on the
> manufac. and model number. All of your questions will be answered once
> you find the correct document.

Thanks for your reply. The Aquastat is a Honeywell Model L4081B. I
googled and found the data on it.

http://customer.honeywell.com/Techlit/pdf/60-0000s/60-2105.pdf

My unit only has two dials, HI and LO. The manual states that HI sets
the boiler temperature, and LO controls the circulator. It doesn't
describe how to set the "differential" temperature.

My question still is: With HI set to 160F, why does my gauge show
temperatures as high as 185F? The diagram in the manual shows that the
burner shuts off at the HI set point.

Art Harris


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