Damian,
You will want to have the recirculation return line piped to the cold side of the mixing valve with the bypass return to the tank. It valve to the tank should be opened to allow it to bypass to the tank but with enough restriciton to send most of the return water throught the mixing valve to maintanin a stable mixed outlet temperature. If you send the return water through the tank and not the cold side or have too much bypass through the tank and you may see the mixed outlet temperature "Creep" above the desired setting. We recommend globe valves be used for control the flow the flow to the tank. Once the system is set up you usually will not need to make changes in how it is balanced.
Damian,
You will want to have the recirculation return line piped to the cold side of the mixing valve with the bypass return to the tank. It valve to the tank should be opened to allow it to bypass to the tank but with enough restriciton to send most of the return water throught the mixing valve to maintanin a stable mixed outlet temperature. If you send the return water through the tank and not the cold side or have too much bypass through the tank and you may see the mixed outlet temperature "Creep" above the desired setting. We recommend globe valves be used for control the flow the flow to the tank. Once the system is set up you usually will not need to make changes in how it is balanced.