TAC AB, 1999-08-18
0-004-7516-1 (GB), 5:5 (16)
TAC Xenta 102 Handbook
Functional description
Emergency mode
In an emergency, the controller can force the damper to
completely opened or closed by means of nviEmergCmd, see the
table below. The heating sequence and the fan are disabled. The
emergency mode has a higher priority than all other modes.
5.2.3 Measuring zone temperature
You can measure the zone temperature either with the wall
module (thermistor sensor) or with a LonTalk temperature
sensor node connected to nviSpaceTemp. If nviSpaceTemp has a
valid value, the controller will use this, otherwise the thermistor
value will be used. The thermistor value (or via the network)
can be adjusted by nciSpaceTempOfst having received a value;
this is added to the thermistor value. The value the controller
uses is also put out on nvoSpaceTemp. If neither value is valid,
nvoSpaceTemp gets the off value. nvoSpaceTemp is sent out
when it has changed at least 0,1°C.
Index Variable name
Description
5
nvoSpaceTemp
Zone temperature output
15
nviSpaceTemp
Zone temperature input
32
nciSpaceTempOfst Zone temperature sensor adjustment
nviEmergCmd
Description
EMERG_NORMAL
Normal operation
EMERG_PURGE
Completely open damper (100%)
EMERG_SHUTDOWN
Completely closed damper (0%)
EMERG_PRESSURIZE
Completely open damper (100%)
EMERG_DEPRESSURIZE
Completely closed damper (0%)
Table 5.4 The relation between nviEmergCmd and forcing.
Index Variable name
Description
14
nviApplicMode
Application mode input
20
nviManOverride
VAV manual override input
21
nviEmergCmd
Emergency command input