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Superstor low delta-t problem
I have a problem with two instatations that I could use some advice with.
Both systems had the same boilers 140M, both with a superstor indirect(one 80 and the other 119), both with in floor radiant, one has hydroair. Both systems, years after install when I was out performing yearly maintenance found that when in DHW mode there is at the most a 10° delta-t and the boilers are cycling. Everything was working perfectly for years. I just had to replace one of the boilers because it had a Leak in the heat exchanger and replaced the 140M with a ELP-199, and have been trying to figure out what is going on with the DHW delta-t. Then this week I went to replace the blower on the other install that was having the DHW delta-t issue and discovered that boiler also has a leak in the heat exchanger. Both boilers have a Taco 0011 for the DHW pump, one location I know has a water softener and I'm not sure about the other location. also both locations run perfectly fine when they are in heating mode. HTP suggested to shock the superstor heat exchanger in case there is any buildup on the heat exchangers. they told me that the elite plus should have a taco 2400/45 instead of the 0011 but the 0011 should still work, just not get maximum input into the tank. I have not been able to return to try shocking the heat exchanger yet. Besides that i have not received any advice from HTP. Any advice would be appreciated.