I have a Honeywell 8124 aquastat with an oil fired Burnham boiler and
Beckett burner all 6 years old.
Live on Long Island, boiler used for heat and hot water (goes to a storage
I just happened to look at the aquastat and found the hi at 165, lo at 160
and diff at 0.
I thought there was supposed to be a 20 degree separation between hi and lo
I remember my service guy for my old system told me 180-160 in winter and
140-120 in summer (for hot water only)
What should my summer/winter settings for hi, lo and DIFF be for this
aquastat?? I took a gander and set it to 170-150 with 15 diff.
Your input is greatly appreciated!
Thanks and happy New Year
I is not broke, but with such a narrow setting (5 degree separation)
the boiler was running almost continuously. Great for the oil company.
I'm looking to optimize the performance of the system already
operating at 83% efficiency...especially at todays oil prices.
Generally, knowing the type of radiation you are using in your home
would be a wonderful bit of info to have to select the temp you would
need.................but Id go with 260 and 240. :-)
Thanks for the follow up posts.
As per request I have a baseboard hot water heating system. two zones
controlled with setback electronic thermostats.
As for the 260-240, I would presume that will literally make my boiler 'blow
off steam" as well as make extremely hot water...but I am not an HVAC
specialist. That's why I posted here.
I put it at 180-160.
The question still remains where to set the differential. It ranges from
10-25 degrees. I would be better able to decide if I KNEW what the function
of the diff control is and how it works.
Thanks again for your posts.
here is a link to your aquastat
this unit has a low limit for preventing your circulator from running when
the boiler is colder than the low limit setting.
The differential controls how much cooler than the high limit setting it
will allow before turning on the burner.
In any case, please read it for yourself and you can ignore my description,
as I am only a home moaner also living on Long Island paying $3.08/gallon
and going up.
But I frequently stay at Holiday Inn Express's, so It gives me temporary
smartness and abilties. I am, as my nickname says, a Dimwit, and don't let
anybody tell you elsewise.
Bubba is one of the senior tradesmen here, so his recommendation may be the
correct one. He is usually right on the money :-)
Thanks so much for the link. After reading the literature ("settings and
checkout") I have a better understanding of the low limit differential. BUT,
I am still unclear as to what effects the different set points of the
variable diff (10-25 deg) have between the burner and circulators and what
effects it would have on my heating system.
A question for Bubba or one of the other senior tradesman ??
yes, I am not in the trade. I am in the automation controls line for the
company I work for, but when it comes to HVAC, I only want to ty to
understand things, but leave the work to the pros in this trade. there is a
lot to know about lots of stuff here.
I have respect for these guys who work hard and know their stuff.
Besides, at my age I am tired of getting filthy and working on machinery in
very awkward positions. I happily pay others to work on my HVAC equipment.
Wow, off the beaten path a bit?/ (no PUN intended!)
I have set my boiler to 180/160 with low diff at 10. SEEMS to be fine, but I
am still curious as to what difference setting the low diff at 15, 20, or 25
degrees would do...
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