Boilers - Home Heating Steam and Hot Water Systems - Burnham (1976) hydronic boiler & L8124E

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JSpheekas
02-03-05, 05:57 AM
I had a defective (intermittant relay) L8148J Aquastat and replaced it with a L8124E on a Burhan P3-W-22An Boiler. I have three Zone Valves (Taco 571-2) operating on a seperate 24V transformer feed..... All zone valves and thermostats operate properly...

Question: with the 8148J, my house was always (toasty warm), now with the 8124E, house seems to be MUCH MUCH cooler.

My current settings on the 8124E:

High limit: 200
Low limit 160
Diff Set: 15


When thermostat call for heat boiler kicks on to heat up and circulator turn on around 190-200....


Also...did I make a mistake by using a L8124 instaed of the 8148...I thought I would save on gas expense by keeping boiler temp higher than cold start???

Thanks...

Any ideas?????

Grady
02-03-05, 06:30 PM
I can't answer your question about temperature swings. The control should not contribute to temperature swings. Regarding the 8124 vs. 8148: Yes you did make a mistake. It costs much more to keep that boiler hot 24/7 than for it to fire on demand. Don't get me wrong. I think the 8124 (or newer 7124) is a great control. But keeping the boiler that hot all the time wastes fuel.
shrtct
02-05-05, 03:31 PM
I can't answer your question about temperature swings. The control should not contribute to temperature swings. Regarding the 8124 vs. 8148: Yes you did make a mistake. It costs much more to keep that boiler hot 24/7 than for it to fire on demand. Don't get me wrong. I think the 8124 (or newer 7124) is a great control. But keeping the boiler that hot all the time wastes fuel.

Well i disagree on what you state. when the system work on demand (Cold Start) a few things happen to it. one it will cool down way to quickly and take longer to heat up. Specialy when all that cold water comes around. IF you see what happens on a cold start boiler (Inside) compared to a system that stays warm. You would be amased. Now for using to much oil. Na it will use enough not to notice it. Plus save the life of the boiler internaly.
Try changing settings toi 190 H 170 L with a diff of 10 and see what that does.
shrtct

Grady
02-05-05, 04:40 PM
Boilers will, no doubt, get dirtier & seem to take longer to get heat into the house but in reality, even if the water is only 100º it is warmer than the space & giving off heat. I am not a fan of cold start on pin boilers but it is cheaper to operate & by bringing on the circ with the burner does not lead to cold slugging. In fact, you are more prone to a cold slug by holding off the circ until you reach 160-170. In an ideal world all boilers would have a thermostatic by-pass to prevent this but we don't live in a perfect world. Maybe your experiences are different than mine.