Shutdown Strategy describes how you want the coil to behave when the unit is shut down.
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Off sends a 0% command to the coil and stop a coil pump (if you have one).
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Protect Coil Based on Outdoor Air Temperature opens the valve, as needed, when the outdoor air falls below the low limit setpoint. This strategy can protect the air handler coils during extreme temperatures.
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User Defined Position commands the valve to a pre-defined position while the unit is in shutdown mode.