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Occupancy Status - Honeywell Excel 10 W7752D User Manual

Fan coil unit controllers lns plug-ins
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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
(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

Occupancy Status

The occupancy status is determined based upon the following table. Manual override may come from nviManOccCmd or from
the bypass push-button.
scheduled occupancy mode
"occupied"
"occupied"
X
X
X
"occupied"
"standby"
"standby"
"unoccupied"
"unoccupied"
X=Don't care
EXCEL 10 FCU CONTROLLER LNS PLUG-INS USER GUIDE
W
network
ON
ORKS
Table 3. Effective occupancy mode arbitration
occupancy sensor status
room occupied
room not occupied
X
X
X
X
X
X
X
X
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
manual override status
not assigned
not assigned
"occupied"
"unoccupied"
"standby"
"standby"
not assigned
"standby"
not assigned
"standby"
7
effective operating mode
OC_OCCUPIED
OC_STANDBY
OC_OCCUPIED
OC_UNOCCUPIED
OC_STANDBY
OC_OCCUPIED
OC_STANDBY
OC_OCCUPIED
OC_UNOCCUPIED
OC_BYPASS
EN2B-0285GE51 R0909

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