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Author:
Snickers (MA)
Our Burnham oil boiler v13A (42 years old) is running almost constantly when turned on. A rattling noise from the circulator. It provides heat and hot water. Keeps firing as if not controlled by thermostats or controller. Two Taco zone valves 571-2. Two zones have two new Honeywell nonprogrammable thermostats. One zone appears better than the second in that it doesn’t exceed more than 10 degrees above set point. Zone 2 is worse. If the set point is 65, it keeps hearing to 78-80 degrees F or until I turn it off. The aqua stat is Hunnewell 1297L. Both levers on the zone valves are fixed at open. Aqua stat at 180 high and 150 low. Taco circulator pumps. Carlin burner motor. Transformer volts work.
When push reset on aqua stat, and it is not running, it won’t turn on. When it is running and press, it won’t reset. Honeywell aqua stat is 1297L. So far, had programmable and replaced with new nonprogrammable, thinking this is reason burner is not controlled by thermostat. The burner on and off works from the emergency switch and boiler. There is 24v at burner for thermostat wires. When remove the wires from the burner, it continues to run. When turn off thermostats, it runs. We vacuumed some of the burner and vents. Pipes hot above valves. Thanks in advance for any suggestions. I can provide photos. When off it continues to make noise in pipes.
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Author:
Tom130 (IL)
When you say "Both levers on the zone valves are fixed at open" do you mean the valves are in bypass instead of auto mode? Why? Have you tried it in auto?
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Author:
Snickers (MA)
Tom- yes. The zone valves are in open manual instead of Auto. The last technician moved it to open and I don’t know reason. I just placed both levers to Auto to see if this works.
Update: Thank you. The boiler is working better now that I set zone valves to Auto. It seems this was the problem. It is still firing when the thermostats are off, but it stayed off for at least an hour after I turned it to Auto. I will give it time to see if it works. Thank you.
Edited 3 times.
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Author:
Tom130 (IL)
That's what I'd expect. The aquastat keeps the boiler at temperature and the thermostat opens the zone valve which tells the circulator pump to run.
Edited 1 times.
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Author:
Snickers (MA)
Tom, Thank you!
The problem is solved. The zone valves on auto are working, and heat is shutting off at set temperatures. This was a great learning experience.
Edited 1 times.
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