Vmax I&O Manual │Cascade Instructions
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.
Max Load – The total load rating of circulators powered by outputs BOILER PUMP and
CH PUMP, or BOILER PUMP and DHW PUMP cannot exceed 2.6 Amps.
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