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Question re: Taco 007e and expansion tank position.
I have a newly installed boiler with a new Taco 007e pump. The installers put the expansion tank connection near the pump but on the downstream side. After the installation was complete, I saw in the boiler manual (and the info regarding the 007e I found online) that the expansion tank should be installed upstream (suction side) of the pump and if installed otherwise it would affect pump performance. My questions are (1) how does this affect pump performance, (2) given that the pump is a variable speed that senses changes in hydrostatic pressure, does the expansion tank’s position in the loop negate pressure changes and cause the pump to stay on a slower speed always, and (3) could this cause the boiler to short-cycle because return water is entering the boiler is at too low of a flow. Currently I’ve got the high limit set at 180, the return temp is about 115 to 120 and the boiler runs a minute and a half before shutting off on limit. Outside temp is minus 22. Thanks in advance for any help or suggestions.