armstron 1060

bluenose_31

I ran into a puzzle. I have a site that has a armstrong 1060 circulator that is supplying three phase III tr120. It is set up primary/secondary off the main loop. This circ has been airlocked 3 times in the last 2 weeks.The rest of the system shows no signs of any air troubles. Could this circulator be sucking air in at the seal?(without leaking water out) This pump has pressure gauges on both sides they are showing 25 and 18(when the pump is running). any suggestions would be helpful.

Ken_40

Since you mentioned...

The Armstrong is the circulator for the 3 Phase III's we must assume the primary loop is not the source of the air?

The Phase III's have a bleeder on the very top of the shell HX, the one that your Armstrong is working with. A sealed system is a sealed system, there would have to be a venturi "zone" where air would be sucked in, perhaps a small vent on the suction side of that secondary loop - where air might get sucked in? Anyhow, bleed each of the Phase III's and see if air comes out. It better! It is the highest point of "slow moving: water and the natural place for air to be trapped within that "zone."

You state the suction/discharge gage readings as 18/25 respectively, what's the static pressure when the Armstrong's off?

bluenose_31

pressure

The pressure is about 19-20 with the pump off. I have repace all three air vents on the Phase III. I could not get the water/air to move with just trying to bleed the vents, I had to bleed the pump's volute by loosening the bolts on the pump itself. So I believe the impeller itself was air locked. The volute does not have the little 1/4" bleed ports for some reason. This pump is located below the primary loop but above the PhaseIII tanks. There is another bank(5)of phaseIII with it's own 1060 pump( which has the 1/4" plugs) which are not giving me any grief.

tim smith

Taco pump w/ air problems

Have you pulled pump out of veloute, maybe it is a worn out impellar and your not getting flow or possible debris in vanes. Tim