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Lochinvar Armor water heating boilers............
Anyone having HX issues with them?
We had a 9 month old AWN199 spring a leak in the HX on Christmas day (naturally) . It provides DHW for a 1500 head dairy farm and of course had to replaced immediately so we swapped out the whole boiler. (Thanks to the guys from Etna Supply here in Michigan for meeting us at their shop at 10PM Christmas evening).
Drew brought the failed unit back this morning and while he was there another contractor at the counter became very interested in the conversation. Seems he was there for the same reason and started giving the poor dude behind the counter all kinds of crap for supposedly telling him they hadn't had any failiures at all with the Knight or Armor HX's.
Just makes me scratch my head a little because we have a number of these out there in high demand commercial and agricultural applications. If we are getting ourselves into trouble I want to know.
Couple notes about the job the failed boiler was on. It maintains a 750 gallon holding tank at 170-175*. All incoming water is softened to 5 grains hardness or less. The unit would "perk" every once in a while causing the whole thing to vibrate and shake for a couple minutes and then not do it again for a long period of time. Like weeks. We flushed and high pressure purged it several times thinking there was something restricting flow in one or more of the HX sections. Never got anything out of it nor did it make the perking go away. Lochinvar tech service went through all the installation parameters and burner set up with me and was very helpful but in the end with all the combustion specs and flow rates spot on, it still perked. Had to be some kind of restriction in the HX right from the get go IMHO.