The System 450 reset control modules automatically adjust the setpoint for a supply control loop, based on input from the outdoor or ambient master sensor and the user-selected reset setpoint settings. This functions saves energy by using only the required capacity of the supply to heat, cool, dehumidify, or humidify the preferred space or environment.
See Figure 1 for an example of Setpoint Reset Control for both a chilled water temperature reset application and a boiler water temperature reset application. See Table 1 for information on the System 450 control modules with this feature.
Figure 1. Reset setpoint application for boiler water supply (BWS) and
chiller water supply (CWS) showing relationships between the reset