The Geo-Flo Pump Sharing Relay Control allows two separate systems(such as geothermal heat pumps or hydronic air handlers) to control a single pumping system such as a flow center or a chilled water pump. Whenever either of the two sets of 24VAC terminals receives a 24VAC signal the controller (relay RY1 or RY2) switches 115/208/230 VAC power from the source to the pump(s). The board is clearly labeled with 24 VAC, 240V IN, and 240 V OUT for ease of installation. The control also features two LEDs which illuminates when a 24 VAC signal is received. An additional pump sharing relay can be added to allow three units to energize a pump.
It is not recommended to use this controller to energize permanent magnet ECM pumps such as the Grundfos Magna3 via high power (208/230 V) due to the high in-rush current from the pumps. These ECM pumps should be controlled via low voltage/contact closure as is done with our 3808 Pump Enable Control.