Circulator on Oil Furnace


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Old 01-17-09, 11:35 AM
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Circulator on Oil Furnace

Hi There,
I have Beckett AFG V1 Oil furnace was built on May 5, 1995.
I was checking settings on the furnace and noticed that Circulator has been set to 140.
Can you please explain what is that mean?

The reason I was checking the setting was I felt that switching between burner and water pump is to quick. may be it is not related.

Thanks In advance.
 
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Old 01-17-09, 01:55 PM
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Bonjour,

The Beckett part of your boiler system is only the BURNER. There is another name on the boiler system itself I am sure.

The setting that you see 140... is that inside of a control box?

Are there other temperature dial settings inside that same box?

Is the box gray in color, appx 100mm x 150mm in size? Is there a 'badge' on that cover that says 'Honeywell'?

Is there a label on the inside of that cover with a model number?

Does your heating system also heat and provide domestic hot water to your home?
 
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Old 01-18-09, 07:25 AM
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That is exactly what you were describing.
There is 2 setings in this metal gray box. One for High Limit which I assume is for temperature and the other is for CIRCULATOR which is set to 140.

On Circulator range is between 100 and 200.
On that metal box there is a sticket says: WHITE-RODGERS
and inside of the box there is another sticker says:
TYPE 11C15-12
STYLE NONE

What is the functionality of this Circulator. I assume it is water pump related but need your expertise to understand better. What is the difference between Circulator set to 140 and 200.

PS: My furnace does not provide domestic hot water

All your help really apreciated.

Best Wishes.
 
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Old 01-18-09, 02:25 PM
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The HIGH setting on your control is the HIGH LIMIT for the boiler water, and that is typically set to 180F.

The CIRCULATOR setting controls the temperature of the boiler water at which the circulator will turn ON.

When the boiler receives a call for heating, the burner will turn on and begin to heat the water. When the water reaches the setting of the circulator control, the pump will run. The burner and circulator will continue to run until the thermostat is satisfied and then turn off... OR... if the thermostat continues to call for heat, and the boiler water reaches the high limit setting, the burner will turn OFF, but the circulator will continue to run. If the heat call still continues, the burner will turn back on when the boiler water cools to somewhat below the setting.

I believe you may be able to lower that circulator setting somewhat, and the circulator will run sooner in the heating cycle. Try lowering to 130...

Here is a link to the instruction sheet for your control. It explains several different uses for this control, but one of them will fit your use.

11C15 Control PDF
 
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Old 01-20-09, 08:45 AM
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Thank you so much for this useful information.

Last question:
During cold weather and mild weather, should I adjust this settings for max. efficiency?
Oil company said in mild weather I might drop HIGH LIMIT to 160 but no information provided on CIRCULATOR settings.
What will be optimum level for both settings during cold weather and mild weather?

Your suggestion will be appreciated.

Once again, thanks moderators to run this forum. It is very useful.
 
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Old 01-20-09, 03:14 PM
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It's really difficult to say what the 'optimum' settings might be... but I can say that you probably ought NOT drop the HIGH setting below 160... I do agree that in mild weather 160 will probably be fine to heat the home, and save some fuel too. Reality is also that 160 might even be enough to heat the home in COLD weather too! A lot depends on the type of radiators you have, and the heat loss (how much insulation, etc) that your home has. Try leaving the setting at 160 in the cold and you will know if the home is not heating properly, and then increase it.

I also think that yes, when you drop the HIGH, you could also drop the LOW...

In mild weather you obviously don't need the hottest water to heat the home... so allowing the circulator to run SOONER in the heating cycle is probably advisable. In fact:

In ALL weather, the sooner that circulator comes on, the sooner you start to get heat into the home. So try 130, see how that works for a while... and then maybe even go down to 120 ... and try for a while...

What type of radiators are in your home? Cast iron standing radiators? fin and tube baseboards? cast iron baseboards? Knowing this might get different answers for the above.
 
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Old 01-20-09, 09:33 PM
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circulator on oil furnace

keep in mind the more zones or the more sq. ftge. you are heating will make the water cool quicker thus making the boiler and burner cycle more often. 3 zones or less and under 1800 sq. ft. i would use the 160/165 high limit setting and 130 on the circulator for your average heating days. More than 3 zones or over 1800 sq. ft. or in extremely cold months i would stay with the 180 high limit. the circulator at 130/135 year round should be fine.
 
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Old 01-21-09, 06:32 PM
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I have been searching on the internet and found that the type of radiator I have at home is fin-tube baseboard.
How this will change settings as you described previously?

PS: I have only one zone and sq.ft is less than 1500
 

Last edited by xanterra; 01-21-09 at 06:34 PM. Reason: additional info
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Old 01-21-09, 08:18 PM
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Start out with 160 HIGH and 130 LOW and see how that goes.

If you find that the boiler can not heat the home well when it's really cold out, then increase it to 170 ... or even 180 on the high setting.

I believe that you will be fine leaving the LOW at 130.

If you wish to experiment, try dropping to 120 on the LOW. Otherwise, leave the LOW at 130 year round.
 
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Old 01-22-09, 08:17 AM
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Thank you so much. Beer 4U2
 
 

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