Honeywell W7750A Not, Assigned, Start-Up, Wait, Cooling, Heating, Emergency, OFF Mode, Disabled

EXCEL 10 W7750A,B,C CONSTANT VOLUME AHU CONTROLLER

Table 5. Modes Of Operation For The Excel 10 W7750 Controller (Continued).

Mode	Description	Events causing a controller to switch to this mode
UNOCCUPIED	Controller occupancy mode was	Network input (DestManOcc) containing a time-of-day schedule
	overridden to Unoccupied mode	override signal of UNOCCUPIED from the Excel 10 Zone Manager or
		other LONWORKS Bus device.
BYPASS	Controller occupancy mode was	DI (Bypass) was pressed, and the Bypass duration timer has not yet
	overridden to Bypass the current	expired, or the network input DestManOcc has a value of BYPASS.
	Unoccupied mode
NOT	No Bypass action	No Override input received.
ASSIGNED
Operational Modes (User Address: StatusMode)
START-UP	On power-up, provides a staggered	This mode occurs on controller power-up, and after downloading to the
AND WAIT	start sequence to evenly apply the load	controller from the configuration tool. Temperature control loops are
	to the electrical system.	disabled.
COOLING	The Excel 10 is controlling the Cooling	Space temperature has risen above the current cooling setpoint, or the
	mode.	network input (DestHvacMode) is COOL.
HEATING	The Excel 10 is controlling the Heating	Space temperature has fallen below the current heating setpoint, or the
	mode.	network input (DestHvacMode) is HEAT.
EMERGENCY	Compressors are disabled and only	The network input (DestManHvacMode) is EMERG_HEAT.
HEAT	Auxiliary Heat stages are allowed to
	operate.
OFF MODE	The heat/cool control is turned off	Network input (DestManMode) containing AHU operational mode
	immediately. The node is not running its	information from C-Bus has value of MORNING WARM-UP.
	normal temperature control.
DISABLED	The heat/cool control and frost	–
MODE	protection are turned off immediately.
	The node is not running its normal
	temperature control.
SMOKE	The node has entered a smoke	Network input (DestEmergCmd) containing smoke control signal from
EMERGENCY	emergency. The fan and dampers are	another LONWORKS Bus device has value of SMOKE_EMERG.
	then set to the conditions configured by
	SmkCtlMode. The control remains in
	SMOKE_ EMERGENCY until power is
	cycled or the node receives
	DestEmergCmd set to
	EMERG_NORMAL.
FREEZE	The temperature control is set to HEAT	The Window digital input detects an open window.
PROTECT	with the setpoint set to the frost limit
	setpoint 46.4°F (8°C).
MANUAL	The physical outputs are being	Typically this is done by the user through E-Vision or XBS by setting
POSITION	controlled manually. The temperature	the point DestManMode to MANUAL mode.
	control loop is turned off.
FAN ONLY	Control algorithm is disabled, except	The space temperature sensor has failed, or the network input
	that the fan is turned on.	(DestHvacMode) is FAN ONLY.
DISABLED	Control algorithm is shut off.	Network input (DestManMode) containing AHU operational mode
		information from an operator or the network that has a value of
		DISABLED.

NOTE: During all modes all digital and analog physical inputs are periodically read, the diagnostic output network variables can be polled, the input network variables are received, and the output network variables are sent periodically.

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