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Old 12-09-2019, 05:34 AM   #15
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I have wrapped on the check valves, I can feel the pumps are working. Seems like the problem is at the return manifold possibly. I have all 3 zones running and when I remove one of the return lines from the manifold connections you would think fluid would come back out of the manifold, but nothing. Is it possible there is a blockage? What about the radiator cap ? Could that stop the system from flowing?
Although you report the burner as operating it almost sounds as if you don't have enough antifreeze in the system, i.e., no fluid in the return line?? If you look in the install manual it will tell you how to purge the lines by shorting the pumps. If it truly is not the check valves jammed up, it's all that occurs to me. How long did this unit sit before you tried using it? I have a 600D and there is no manifold, the return lines just come back into the tank integral with the unit.
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Old 12-09-2019, 06:38 AM   #16
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Caution
Everytime you UNHOOK YOUR LINE'S.
You introduce AIR INTO THE SYSTEM.
And you should repurg and presurize the system.
If your unit sat for a long time ???
Its likely your boiler valves are gunked up.

Add some boiler fluid slowely over time and see if you can purge the air out of the tubing.

I think your trouble shooting efforts have caused you more work.
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Old 01-02-2020, 10:17 PM   #17
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Got it figured out. The manifold that the return lines all connected to in the unit was completely clogged with sediment (looked like dirt). I removed the hoses and took the manifold out . The clog was so solid I had to drill thru it all to clean it up. Then got a wire brushes to clean it up. The rubber hoses connected to it were all clear, only the aluminum manifold was filled solid. So far the unit has worked great since.

Thank you for your help.
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Old 01-03-2020, 05:04 PM   #18
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Fascinating and strange. Where would the sediment have come from? It is a closed system and the boiler fluid should not have sediment settling out of it.

Was it more a matter of corrosion?
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Old 01-05-2020, 12:08 PM   #19
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It could have been corrosion. Never seen anything like it. The manifold is aluminum and was the only part that was affected.
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Old 01-05-2020, 03:33 PM   #20
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Got it figured out. The manifold that the return lines all connected to in the unit was completely clogged with sediment (looked like dirt). I removed the hoses and took the manifold out . The clog was so solid I had to drill thru it all to clean it up. Then got a wire brushes to clean it up. The rubber hoses connected to it were all clear, only the aluminum manifold was filled solid. So far the unit has worked great since.

Thank you for your help.
Might be a good idea to change the fluid
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Old 01-05-2020, 03:49 PM   #21
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It could have been corrosion. Never seen anything like it. The manifold is aluminum and was the only part that was affected.
Aluminium is reactive, it could have reacted to something in the fluid. Strongly doubt sediment. If it was brass it would be less likely to be corrosion.
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Old 01-08-2020, 03:46 PM   #22
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AH is an expensive item I have not read yet about anyone testing and changing its fluid in few years, I have been lurking here. Seems like it would difficult to completely empty the circuits.We have a solvent distilling unit at work and have to monitor glycol for lowering ph levels in chiller side. Heating side is synthetic oil.The oil is as high 370f When it starts cooling the oil at end of process.
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Old 01-09-2020, 09:13 PM   #23
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I just ordered a tester to check the fluid make up. I will test the glycol and let you know what it reads
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Old 01-09-2020, 09:59 PM   #24
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I see the Centry brand comes in 2 to 1 concentrate . So I guess you could fully wash out system and still get proper concentration.
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Old 01-09-2020, 10:18 PM   #25
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It's not hard to drain, flush (bypass pumps to flush) and fill with premix.
I paid to have it done, but it was easy after watching.
I've since drained mine numerous times to fix leaks, etc.
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AH is an expensive item I have not read yet about anyone testing and changing its fluid in few years, I have been lurking here. Seems like it would difficult to completely empty the circuits.We have a solvent distilling unit at work and have to monitor glycol for lowering ph levels in chiller side. Heating side is synthetic oil.The oil is as high 370f When it starts cooling the oil at end of process.
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Old 02-12-2020, 12:53 AM   #26
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I have wrapped on the check valves, I can feel the pumps are working. Seems like the problem is at the return manifold possibly. I have all 3 zones running and when I remove one of the return lines from the manifold connections you would think fluid would come back out of the manifold, but nothing. Is it possible there is a blockage? What about the radiator cap ? Could that stop the system from flowing?
We had an issue where the furnace to the front half of the coach only blew cold air. I talked by phone to John Carrillo, a hydronic heating specialist located in CO. He said that about 95% of the time, the problem we had could be fixed by tapping with a wrench or screwdriver handle on the part of the pipe that holds the stuck valve. However, you have to tap the pipe while the Aqua-Hot and furnace are running. We turned on the furnace so it was calling for heat in that zone. We had already removed the metal shroud from the A-H. The front zone is pump #3. Based upon the diagram in the owner's manual, I traced the supply and return ports for that pump. I tapped on the "fat" part of the correct port. It's located just BELOW the stainless steel top of the A-H case. It looks like a pipe that "swallowed a ping-pong ball". The "fat" part is where the valve is located. It worked. The A-H motor immediately sounded different. My husband was inside monitoring the air coming out of the furnace vents. He let me know that it immediately started blowing warm air. Thank you, John C.!
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Old 02-12-2020, 08:41 AM   #27
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I just ordered a tester to check the fluid make up. I will test the glycol and let you know what it reads
We never heard back from the OP about how the tester work .

Aluminum is very reactive to PH levels that are to high .
I have seen aluminum completely dissolve when placed in the wrong
chemical .
The OP should change the fluid regardless .

Ray
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