EXCEL 10 FCU CONTROLLER LNS PLUG-INS USER GUIDE
Window Sensor
The digital input for reading input from a window contact provides the Excel 10 FCU Controller with a means to disable its temperature control activities if someone has opened a window or door in the room. If no window sensor is directly connected to the Excel 10 FCU Controller, the sensor from another node may be used by binding it to nviWindow. Frost protection remains active. Normal temperature control resumes when the window closes.
Demand Limit Control
When a
Optimum Start Gradients
There are two parameters, Cool Rec Ramp and Heat Rec Ramp, which can be configured to cause the cooling and heating setpoints respectively to ramp up to their occupied settings from their unoccupied or standby settings prior to scheduled occupancy. The Excel 10 FCU Controller uses the configured rates to determine the optimum time to start increasing the heating or cooling demand. See the following figures. The configuration parameters are in K/hour.
Fig. 5. Optimum start - cooling
Fig. 4. Optimum start - heating
Occupancy Status
The occupancy status is determined based upon the following table. Manual override may come from nviManOccCmd or from the bypass
| Table 3. Effective occupancy mode arbitration | ||
scheduled occupancy mode | occupancy sensor status |
| manual override status |
"occupied" | room occupied |
| not assigned |
"occupied" | room not occupied |
| not assigned |
X | X |
| "occupied" |
X | X |
| "unoccupied" |
X | X |
| "standby" |
"occupied" | X |
| "standby" |
"standby" | X |
| not assigned |
"standby" | X |
| "standby" |
"unoccupied" | X |
| not assigned |
"unoccupied" | X |
| "standby" |
X=Don't care |
|
|
|
effective operating mode
OC_OCCUPIED
OC_STANDBY
OC_OCCUPIED
OC_UNOCCUPIED
OC_STANDBY
OC_OCCUPIED
OC_STANDBY
OC_OCCUPIED
OC_UNOCCUPIED
OC_BYPASS
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