EXCEL 10 FCU CONTROLLER LNS PLUG-INS USER GUIDE
Fig. 9. Three-speed fan switching and hysteresis, cooling mode (defaults for switching levels shown)
Type of Heating and Cooling Equipment
Excel 10 FCU Controllers can operate with either
Excel 10 FCU Controllers can operate with a variety of actuators for heating and cooling equipment. Floating actuators can be used; this requires that the valve run time be specified during configuration of the controller.
The actuator runtimes can be configured in the range 20 sec to 600 sec in steps of 1 second.
Valves will be synchronized by driving the valve fully closed
(150% of the valve run time) under the following conditions:
•whenever the control level reaches 0% or less;
•at
•whenever the occupancy status changes to a lower mode, e.g., from occupied to standby or unoccupied;
•when synchronization has not taken place within the last 24 hours.
Once synchronization has been completed, the output control will be returned to the normal control loop.
Valve action can be configured as either direct or reverse. When in a
PWM electronic valves and thermal actuators can also be connected and can be configured as either direct or reverse action. The cycle time must be specified during configuration. In the case of PWM valves, the zero and full positions must also be configured.
Additionally, the W7754K1001 features an extra socket (located to the left of the terminal blocks) containing a digital output suitable for connection to a
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