Dew point function

The dew point function protects chilled-water (CHW) systems against condensation. When the risk of condensation rises, myCoreAI lifts the CHW supply-temperature setpoint above its optimized value so the supplied water never falls close enough to the dew point to cause condensation on pipes and equipment.

myCoreAI normally controls toward a base setpoint — the standard setpoint that applies when the dew point function does not need to intervene. The behavior below applies when no separate base setpoint is available and the dew point function governs the CHW setpoint directly.

Dew point signal

myCoreAI reads the actual dew point signal from the BMS.

• Only one dew point signal can be used per chilled-water system.
• If multiple dew point signals are available, the one to use is selected during the controls and technical review meeting.

How the setpoint is chosen

myCoreAI compares the current dew point against the optimized CHW setpoint and applies a fixed safety margin:

Step	Behavior
Base range	The CHW system's normal MIN/MAX range is treated as the base setpoint range.
Safety margin	A fixed +2 °C is added to the current dew point.
Precedence	If the dew-point setpoint is higher than the optimized range, it takes precedence and the MIN/MAX limits are ignored.

The safety margin is currently the same for all buildings and cannot be adjusted.

Example

• Current dew point: 15 °C
• Safety margin: +2 °C
• Calculated dew-point setpoint: 17 °C

If the optimized CHW setpoint is 14 °C, the system instead controls toward 17 °C to avoid condensation.

Summary

The dew point function acts as an override on the normal CHW setpoint. When the risk of condensation is low, myCoreAI follows the optimized base setpoint. When the dew point rises, the setpoint is raised to dew point + 2 °C to ensure condensation-free operation.