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Grundfos control

dmk Member Posts: 23
Looking for thoughts on what would keep my boiler from firing on a heat call when low limit is turned off. With LL off It only fires when the indirect calls. Jumped out both heat zones and boiler dropped to 114 without firing. Only way i can keep boiler temp up for heat is to leave lo limit on, but isnt the lo limit primarily for a tankless coil?? The only wiring between the grundfos panel and the hydrostat is from T-T to the priority X-X. Is that correct?