Aqustat l8148

Harry Sanichra

I need a Low temp and High Temp also my circulator should comes on whenever my boiler comes on is the L6006
has the feature

Harry Sanichra

What is the setting for a L8148 Aqustat does it comes with a high and low limit.

kevin coppinger_4

the 8148..

only comes witha high limit setting. The differential is built in at approx. 20 degrees. What type of heat emmiters you have and design temp determines what you set the temp at...generally 180 degrees. kpc

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Harry Sanichra

Is there any way we could maintain a low temperature in boiler because water gets too cold in boiler and it has to heat up that before radiator will get hot again.

Ron Schroeder

You could replace the aquastat with a triple aquastat like the L7224U or the older L8124.

Ron

Unknown

You can add an L6006

aquastat to the boiler and maintain temperature with it. This with the L8148 will give you Hi Limit, Low linit and circulator control.

Or you can get an L4006A and wire it in parallel with your burner circuit to maintain temperature.

Harry Sanichra

Where can i get L4006A from and can you tell me a littel more how it works. I tried a triple Aqustat already i don't like the way it works i need my circulator to comes on when my boiler turns on .

Thanks!

Ron Schroeder

Hi Harry,

How did the triple aquastat not work for you? How did you have it set?

The normal operation of a triple aquastat is to prevent the circulator from running when the boiler is near the low limit preventing the boiler from getting too cold with the cool water that initially comes back from the radiators. On a call for heat as soon as the boiler gets a little warmer than the low limit, it lets the circulator run.

Ron

Neil_5

understanding Some more

Ron:

Just to get some more insight of the triple aquastat. You said this turns off the circ untill the boiler reaches temp (doesnt the boiler reaches temp quickly due to no circulation? ) and when the boiler reaches temp, it then allows the circ to turn on, at this point, isnt the system dumping cooler water from the emitters into a now hot boiler?

isnt it better to circulate cooler water with a cooler boiler contents than the above due to the operation of the triple aquastat?

Neil

Ron Schroeder

Hi Neil,

The idea is for the boiler to be enough above the condensing point so that when the cool water gets into the boiler it doesn't cool down below the condensing point. The boiler will begin to heat up rather quickly with no circulation. This is only true with medium to high mass conventional boilers. Low mass boilers (or piping systems with huge amounts of water)need more complex protection methods.

The boiler doesn't have to get up to the High Limit for the circ to work, it just needs to get above the Low Limit and it's Differential.

Ron Schroeder

Neil_5

Limits

Ron:

Thanks for the explanation. Why is it called triple aquastat? The low limit of for the circulator and the high limit if for burner, where is the 3rd?

Would one just replaced the current high limit aquastat with this new unit and wire accordingly?

Neil

Ron Schroeder

It's marketing. There are only 2 aquastats but 3 functions.

1. High Limit
2. Low Limit
3. Circ control

The Low limit part of the aquastat controls both the circ when there is a call for heat and it controls the burner when there isn't a call for heat. Personally, I think the aquastat should have independant control of burner low limit and circ control but that's not the way they do it.

Neil_5

ODR

How does the ODR ties into all of this? easy?

What is considered low/medium mass, when I completely drain my gas boiler I drain 10 gallons.

Neil

Ron Schroeder

Reset usually ties in series with the B1 terminal to the burner.

Cast iron is usually medium/high mass. Steel is usually medium mass.

Neil_5

Thanks

Very informative ... thankyou

Neil