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Ultra High Efficiency 80

I'm working with Wirsbo / Uponor zone control module that has a solid state switching output "ES" stated to be totally isolated. Although I see 5 millivolts between leads. The new Weil-McLain high efficiency boiler requires "dry contact" signal , they certainly don't want 24V. what about...

all Wirsbo

thank you so much ... I love learning , excellent article !

I made note on picture that suction was identified. I've been a domestic pump service tec for forty years, simple enough to see by casting shape alone where water is diverted into center of impeller. I just find it fascinating that the primary loop mixed the cold backwards and worked well...

I'm replacing a 20 year old Munchkin boiler that reportedly functioned well. I appears that the primary circulation pump from day one was installed backwards. Also the air separator / expansion tank is low and on the primary loop as opposed to secondary loop ... most design drawings have the...