TAC AB, 1999-08-18
0-004-7516-1 (GB), 5:3 (16)
TAC Xenta 102 Handbook
Functional description
Economy mode
In economy mode, the controller lowers the energy
consumption in the zone by using the heating and cooling
setpoints for economy in nciSetpoints (could be modified). The
controller is in this mode when nviManOccCmd =
OC_STANDBY and the bypass key has not been pressed.
The LED of the wall module flashes slowly. The bypass key can
be used, and also the setpoint knob, if you want to make a
manual setting.
The alarms for the zone temperature deviation, high carbon
dioxide levels, and flow deviation are blocked, but the alarms
for low zone temperature and window contact can cut out.
Bypass mode
The bypass key on the wall module is used if you want to turn
to comfort mode occasionally from economy or off mode.
When someone presses the bypass key on the wall module, the
bypass timer is started and the controller turns to bypass mode.
The bypass timer runs for two hours, and after those two hours
the controller changes operation mode according to table 5.1.
The controller’s bypass mode acts as the comfort mode during
those two hours. Both setpoints and alarms work as in comfort
mode.
Off mode
When the zone is not used for a longer period of time, the con-
troller can be set in off mode. The controller is in this mode
when nviManOccCmd=OC_UNOCCUPIED.
The light emitting diode on the wall module is out. The setpoint
knob is blocked, but the bypass key is not. The alarms for the
zone temperature deviation, high carbon dioxide levels, and
flow deviation are blocked, but the alarms for low zone
temperature and window contact are enabled.
Index Variable name
Description
1
nvoEffectOccup
Effective occupancy output
13
nviManOccCmd
Occupancy scheduler input
25
nciSetpoints
Occupancy temperature setpoints
