Schneider Electric TAC Xenta 121-FC Data Sheet
TAC Vista
TAC Xenta® 121-FC
Programmable Fan Coil Application
TAC Xenta 121-FC is an easily programmable controller intended for both 2-pipe and 4-pipe applications, with or without re-heat.
It can be configured for use with a multitude of valve actuator types, such as on/off, multistage, increase/decrease, PWM, and so
on. The controller has different types of fan control and advanced fan control functions, including on/off delays, boosting, and
conditioning.
The sequences for cooling, heating, and fan are completely user-programmable, allowing for numerous applications. For energy
savings the controller has built-in economizer functionality. Use TAC Xenta 121-FC with any TAC STR (1.8 kohm) room unit.
Set-up is done using the programming tool TAC ZBuilder, which can be run stand-alone or as a device plug-in to either TAC Vista®
or an LNS-based tool. Using Vista or an LNS-based tool, the configuration settings are downloaded into a TAC Xenta 121, prepared
with the necessary basic application software.
The controller is a LonMark® compliant device aimed at communicating on a LonTalk® TP/FT-10 channel. It is able to operate both
as a stand-alone device and as part of a system. In- and output net work variables can be monitored via the TAC Xenta OP, but
programming relies on the use of the TAC ZBuilder.
TECHNICAL DATA
Supply Voltage
FC/24 .......................24 V AC ±20%, 50–60 Hz
FC/230 ......................230 V AC ±10%, 50–60 Hz
Power Consumption
FC/24:
Controller with TAC Xenta OP ....................5 VA
Digital outputs ..................max. 4×19 VA = 76 VA
Total...................................max. 81 VA
FC/230:
Controller with TAC Xenta OP ....................5 VA
Digital outputs, individual outputs and total.....max. 12 VA
Total...................................max. 20 VA
Ambient Temperature
Operation ................0 °C to +50 °C (32 °F to 122 °F)
Storage ................ –20 °C to +50 °C (–4 °F to 122 °F)
Humidity ..................max. 90% RH non-condensing
Enclosure
Material................................ABS/PC plastic
Enclosure rating.................................IP 20
Flammability class, materials ...................UL 94 5VB
Color ...................................... gray/red
Dimensions, mm (in.)............. 122×126×50 (4.8x5.0x2)
Weight, kg (lb..) ....... FC/24: 0.3 (0.66), FC/230: 0.6 (1.3)
Inputs X1–X3
Voltage across open contact .............23 V DC ± 1 V DC
Current through closed contact .....................4 mA
Minimum pulse input duration ................... 250 ms
Inputs for Sensors B1–B2
Thermistor type ..............NTC, 1800 W at 25 °C (77 °F)
Measuring range .........–10 °C to +50 °C (14 °F to 122 °F)
Accuracy .............................±0.2 °C (±0.4 °F)
Universal Input U1
As temperature input..................... same as B(1–2)
As digital input .........................same as X(1–3)
As analog input ............................ 0–10 V DC
Input R1
Type ........................10 kW linear potentiometer
Adjustment range .................. software configurable
Triac Outputs V1–V4 for heating/cooling valve actuators, 24 V
AC Internally Supplied
Maximum load per output.......FC/24: 0.8 A, FC/230: 0.5 A
Total output load ..............FC/24: 3.2 A, FC/230: 0.5 A
Relay Outputs K1–K3
Maximum voltage ........................... 250 V AC
Maximum resistive load............................ 3 A
Relay Output K4
Maximum voltage .......FC/24: 24 V AC, FC/230: 250 V AC
Maximum resistive load...........FC/24: 3 A, FC/230: 12 A
Voltage Output Y1
Range ................................... 0–10 V DC
Maximum load .................................2 mA
Indication LED Colors
Power ........................................green
Service..........................................red
Interoperability
Standard ..................TAC Xenta 121-FC conforms to
Lo n Ma r k Interoperability Guidelines 3.4 and
Lo n Ma r k Functional Profile: 8501 SCC – Fan Coil
Communication protocol ........................LonTalk
Physical channel ......................TP/FT-10, 78 kbps
Neuron type ............................3150, 10 MHz
Agency Compliances
Emission: CE ............EN 61000-6-3, C-Tick, FCC Part 15
Immunity: CE............................EN 61000-6-1
Safety: CE ................................EN 61010-1
UL 916, C-UL US, Open Energy Management Equipment
(TAC Xenta 121-FC/24): . .Approved for plenum installations
Energy (TAC Xenta 121-FC/230 only, see p. 6):
eu.bac, certificate no. 020711 ................ EN 15500
RoHS directive............................ 2002/95/EG
Part Numbers
Contr Zone TAC Xenta 121-FC/24 .............007306210
Contr Zone TAC Xenta 121-FC/230 ............007306220
Manual ..................................0-004-7692
Plug-in Terminal Blocks TAC Xenta 100 ..........007309140
Adapter RJ10 to Terminals ....................007309210
03-00134-05-en
2
03-00134-05-en
APPLICATION EXAMPLES
Window sensor
1-, 2- or
3-speed Fan
Wall module
Occupancy sensor
Discharge air sensor
Reheating stage
Outside temp. sensor
Economizer
Humidity sensor
Heating coil Cooling coil
Incr./decr. or
thermal actuators
Window sensor
1-, 2- or
3-speed fan
Wall module
Occupancy sensor
Discharge air sensor
Reheating stage
Outside temp. sensor
Economizer Heating/Cooloing coil
Incr./decr. or
thermal actuators
CO
2
sensor
Water temp. sensor
-100 -83 -50 0
0 33 100
Fan
Primary Heating
Secondary Heating
Output
signal
Cooling
Terminal
Load
Control sequence fan coil (example)
TAC Xenta 121-FC can be programmed
to have up to two heating devices and
one cooling device. Each of these can be
a multistage, pwm, analog, or increase/
decrease device.
A Fan Coil unit can have a heating coil
and a cooling coil (4-pipe, Fig. 1a).
It can also be a combined cooling and
heating coil (2-pipe, Fig. 1b). For the
2-pipe application, a water temperature
sensor is required for crossover.
An electrical heater is common as the
second device.
The user defines the sequence; there are
no restrictions that a specific device be
activated first, in parallel, in series, or so
on.
Fan control outputs are always either a
multi stage output (1, 2, or 3 stages) or an
analog output.
Economizer control using an outside air
damper, as well as CO2 control and %RH
control are available.
When the temperature in the zone increa ses, the heating valve closes, see
Fig. 2. If there is still a cooling de mand,
the cooling valve opens and the fan
speed increa ses in steps until the highest
fan speed is reached.
This sequen ce is reversed when the temperature drops.
Figure 1a: Fan Coil unit, 4-pipe
Figure 1b: Fan Coil unit, 2-pipe
Figure 2
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