patch53 said:These pumps would seem to be ideal for use with gasifiers w/ hot water storage.
patch53 said:Russ, a guy from Taco tech support just called back and said the only pump that had issues was the 008, and that it was fixed. I would probably be going with an 0012 for my situation. I ran several scenarios by him and he assured me that the pump should function as needed in all scenarios I described.
So, not sure what to think now. Talk is cheap and they are in the business of selling pumps, so not real surprised by what he said. I wouldn't be needing the pump till next summer, so I guess I'll just wait and see if anything develops. If they're not working like they are supposed to I'm sure more reports of problems will surface.
I really hope any issues they may have are corrected, these pumps sound like they could save money in the long run.
thx, Pat
deerhntr said:Read my blog, and the response to Rowcroprenegade in his thread. I installed one in the injection loop on the load side of my HX. It was recommended by the GARN manufacture, Dectra. I DO NOT think they are an Ideal fit for a system with a wide operating temperature range that is found in wood boiler storage systems. Taco needs to add a ABSOLUTE temperature set point to the equation so the pumps will not get stuck at a false operating point. I would stay away until they acknowledge these pumps are designed for tight operating temp ranges, and they have a fix for the wood boiler application.patch53 said:These pumps would seem to be ideal for use with gasifiers w/ hot water storage.
patch53 said:OK sounds good Russ. BTW, what size circulator did you have?
Pat
ewdudley said:deerhntr said:Read my blog, and the response to Rowcroprenegade in his thread. I installed one in the injection loop on the load side of my HX. It was recommended by the GARN manufacture, Dectra. I DO NOT think they are an Ideal fit for a system with a wide operating temperature range that is found in wood boiler storage systems. Taco needs to add a ABSOLUTE temperature set point to the equation so the pumps will not get stuck at a false operating point. I would stay away until they acknowledge these pumps are designed for tight operating temp ranges, and they have a fix for the wood boiler application.patch53 said:These pumps would seem to be ideal for use with gasifiers w/ hot water storage.
Looking at the position of the VDT supply sensor in your photo I'm thinking you might should experiment by moving it to sense some point on or very near the HX. With it sitting right there next to the pump, the pump doesn't know what the supply temperature is unless the pump is running fast enough to find out, kind of a chicken and egg problem, single equation, two unknowns.
Then again, the idea of maintaining a constant return temperature might have merit as well. Is controlling the absolute temperature setpoint of the return side working for you?
deerhntr said:ewdudley said:...
I'm thinking you might should experiment by moving it to sense some point on or very near the HX. With it sitting right there next to the pump, the pump doesn't know what the supply temperature is unless the pump is running fast enough to find out, kind of a chicken and egg problem, single equation, two unknowns.
...
Tried all of that and then some. I believe, kind of what you elude to, but single equation, multiple solutions, and there in lies the problem. A Local Minimum!
...
The problem with my Outdoor GARN, and most OWB applications, the real "supply" is 110 ft from the HX, so when I'm moving H2O at 2.2 fps, I'm 50 seconds from the HX. By that time the pump has settled into VDT mode, the "Hot" supply is only 2/3 of the way to the HX.
Maybe in the future Taco and others will move more stuff into EEPROM or flash where we can get at it should the need arise in a case like yours.
Cheers --ewd
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