3.1.9 Automatic Fan Speed Control
Temperature sensors can control fan speed using one of three modes based on the type of sensor selected as the fan control
sensor: supply, return, or remote. See Table 3.3 below. Control is based on the selected sensor for both fan control and
temperature control and their setpoints as follows:
• Coupled: The fan control and temperature control sensor selection is the same. When coupled, fan speed is
determined by the temperature setpoints.
• Decoupled—the fan control and temperature control sensor selection is different. When decoupled, fan speed is
determined by the fan setpoints.
Temperature Control Sensor selected
Supply Sensor Remote Sensor Return Sensor
Fan Control Sensor selected
Supply Sensor Coupled N/A N/A
Remote Sensor Decoupled (Recommended) Coupled N/A
Return Sensor Decoupled Decoupled Coupled
Table 3.3 Fan Speed Controlling Sensor Ooptions
To Set Parameters for Automatic Fan Speed Control
1. Touch , then > Setpoints > Fan Control,
• Set Fan Control Type to Manual
• Select a Fan Control Sensor.
• Adjust the setpoint options, then touch Save.
Sensor based fan speed control is set.
2. Touch Temperature Control.
3. On the TEMPERATURE CONTROL secondary panel:
• Select a Temperature Control Sensor.
• Adjust the setpoint options, then touch Save.
3.2 Scheduling Condenser and Cooling Unit Tasks
The Scheduler configures operating conditions and modes for specific intervals. Tasks to schedule include:
• Condenser set back: See Scheduling Condenser Low-noise Operation on the next page.
• Condenser fan-reversal: See Scheduling Condenser Fan Reversal on page33.
• Unit sleep Schedule: Turns off units during times of low demand and controlled only by temperature. Sleep is
interrupted if the return temperature rises above the alarm threshold.
3 Service Operation
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