Originally Posted by Sacdan
I am looking to buy a couple AC-3B or AC-5B. I have a couple 809s that don't pump well over 190°. Will they handle high temps better? Which model would you recommend?
If your having problems above 190* the first thing i would do is drill the impellers...they may be binding on the shafts when it heats up and they expand. Pass a 17/64" drill bit through the center and test it out on some hot water...also make sure the teflon thrust washer is still there.....if that doesnt work then send me back the pumps and we will test them out...they shouldnt have any problems with those temps...we have customers running then at up to 240* with no issues.....granted they are closed system and dont have any air in the system but they will still work.
If you are set on upgrading then i would have to ask how big a system you are planning on building. The AC-5B needs a min 3/4" line feeding it...so if your system doesnt have that then you wont get the full capacity of the pump either...