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Click on
below Heating/Cooling Generator.The Component or Component Group dialog opens.

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Select Closed-Loop Control, if need be adjust Number and Name and confirm with OK.
The closed-loop control is created.

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Select the Manifold, of the circuit(s) to which you want to assign the new controller, in the Pipe Run View.
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In the Heating Manifolds/Cooling Manifolds section, in the Controller column, assign the new closed-loop control to the relevant circuits.
The new control is assigned to the circuit.

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Select the new closed-loop control in the Pipe Run View.
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In the Closed-Loop Control section, click
.The Select a single room closed-loop control system dialog opens.

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Select the desired control components and confirm with OK.
In your project, you have created a new closed loop control with the desired control components and assigned it to circuits.