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EXCEL 10 FCU CONTROLLER LNS PLUG-INS USER GUIDE
EN2B-0285GE51 R0909
7
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 high-electrical-demand signal is received from an
energy management system via the L
ONWORKS network
(nviDlcShed), the Excel 10 FCU Controller uses Demand
Limit Control Bump to shift the current setpoint (down for
heating and up for cooling) by the configured value to save
energy.
Fig. 4. Optimum start - heating
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
Occupancy Status
The occupancy status is determined based upon the following table. Manual override may come from nviManOccCmd or from
the bypass push-button.
Table 3. Effective occupancy mode arbitration
scheduled occupancy mode occupancy sensor status manual override status effective operating mode
"occupied" room occupied not assigned OC_OCCUPIED
"occupied" room not occupied not assigned OC_STANDBY
X X "occupied" OC_OCCUPIED
X X "unoccupied" OC_UNOCCUPIED
X X "standby" OC_STANDBY
"occupied" X "standby" OC_OCCUPIED
"standby" X not assigned OC_STANDBY
"standby" X "standby" OC_OCCUPIED
"unoccupied" X not assigned OC_UNOCCUPIED
"unoccupied" X "standby" OC_BYPASS
X=Don't care