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Grundfos UPZCP-3, 3-Zone Pump Control - Set-up?
I have a 2-zone RFH system being heated with a Tankless Heater. I have the 3-Zone Pump control set-up with the Tankless pump on the 3rd zone relay. I wired the End-switch terminal over to the TT terminal on the 3rd relay thinking, on a call for heat, the end-switch will make and start the Tankless pump. When ALL calls are satisfied, the End-switch opens and the Tankless pump shuts off. What is happening: it works on the start-up, but when ALL zones are satisfied, the End-switch doesn't open unless I kill power to the Control, leaving the Tankless pump running continuously. THE QUESTION: Is there a way to make this work?