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iTach relay

I am trying to automate a commercial door with iTach relay. It requires a brief connection between terminal R1 & R2 which I will achieve with  Close/Open  commands to the iTach. The problem is that as soon as I put the wires into the iTach terminal blocks, the door opener is activated - even though the relay is Open. I am at a loss to explain the behavior. The opener is a Liftmaster MH5011L, if I read the schematics right, R1 & R2 are using 24VAC




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