Fan Control

Each fan individually configures a control mode.

The following control modes are supported:

• PID

• Temperature-Percent Table (%-table)

• Fixed Percent

• Off

PID and %-table control modes configure a control source, which represents what temperature sensor is used.

The following control sources are supported:

• Water Supply Temperature

• Water Return Temperature

• Case Temperature

• Aux1 Temperature

• Aux2 Temperature

By default, all fans operate in PID mode for supply water temperature control.

Percent-Table Mode

Each fan may be individually configured to operate using its own temperature to fan %-table. This is like BIOS custom fan configurations.

Any one of the five temperature sensors, or DeltaT (return temp - supply temp), may be used as a temperature source.

Fixed Mode

Each fan may be individually configured to operate using a fixed speed (percent).

PID Control Mode

The PID controllers satisfy a temperature setpoint, by changing fan PWM duty cycle(s).

The fan controller may operate up to 4 PID controllers, one per the following temperature sensors: supply water temp, case temp, aux1 temp, and aux2 temp.

Setpoint Adjustment for Supply Water Temperature Control

Supply water temperature setpoint adjustment is enabled by default, to handle room and/or case temperature changes. By default, the setpoint adjusts between 28°C and 31.5°C, at 0.25°C increments.

If a case temperature sensor is connected, setpoint adjustment is limited by a difference between supply water and case temperature (allowing fan spin-up when case temperature does not change).