Grundfos 52722370 Pump 320788-702 which leads to metal fatigue

which leads to metal fatigue and stress cracks in the tubes

and 704 series

engineered to regulate the timing and sequence of the indoor blower motor in residential forced-air systems

provided the system uses R-410A and the 3-phase power requirements are met

always verify the trip point with a calibrated manometer

Grundfos 52722370 Pump 320788-702 which leads to metal fatigueThe Grundfos 52722370, model UP43 75BF, is a high performance, single speed bronze circulator pump engineered for demanding commercial and residential hydronic systems. Featuring a 1 6 HP motor operating at 115V, this wet rotor circulator is specifically designed for hot water recirculation and open loop heating applications where corrosion resistance is critical. The robust bronze housing ensures longevity in oxygen rich potable water systems, while