Michael, I would make sure you have the globe valve on the bypass back to the cold line into the tank to create restriction to direct the flow through the mixing valve. If that bypass valve is missing or open the path of least resistance will be through the tank that will push the mixed outlet temperature above desired set point.
Michael, I would make sure you have the globe valve on the bypass back to the cold line into the tank to create restriction to direct the flow through the mixing valve. If that bypass valve is missing or open the path of least resistance will be through the tank that will push the mixed outlet temperature above desired set point.