NTI Trinity TX81 - Page 51

Tx I&O Manual │Cascade Instructions
51
Figure 12-2 Field Wiring
ECM Pumps – due to the large inrush current of ECM pumps, they should only be
switched via an isolation relay, not directly via the boiler controller. Powering ECM
pumps directly will lead to premature failure of the boiler controller’s pump relay
contacts.