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Zone Controllers
TAC Xenta 104-A
Roof Top Unit Controller
L
ON
M
ARK
®
certified controller for small air handling systems and roof top
units for heating, cooling and heat recovery. The room temperature is held
at a constant temperature with sequential control of the heating, cooling
and heat recovery functions. Inlet air and room air temperature can be set
in cascade. The fan mode may be selected to operate continuously during
the occupied mode, or cycle with heating or cooling demand from the zone.
PI control action with individual P-band and I-time setting for heating and
cooling. The controller can be operated on a stand-alone basis or within a
L
ON
W
ORKS
®
network. Can be monitored and parameters can be set centrally
via the central system or remotely via the TAC Xenta Operator Panel.
SPECIFICATIONS
Operating voltage . . . . . . . . . . . . . . . 24 V AC ±20%
Power consumption . . . . . . . . . . . . . . 4 VA
Dimensions. . . . . . . . . . . . . . . . . . . . . 126 x 122 x 50 mm (5” x 4.8” x 2”)
Ambient temperature
Operation . . . . . . . . . . . . . . . . . . . . . -25°C to +50°C (-13°F to 122°F)
Storage . . . . . . . . . . . . . . . . . . . . . . . –25°C to +50°C (–13°F to 122°F)
Humidity . . . . . . . . . . . . . . . . . . . . . . max. 90% RH non-condensing
Enclosure rating . . . . . . . . . . . . . . . . . IP 30
Inputs and outputs
Fan alarm/status . . . . . . . . . . . . . . . . 2 digital inputs
Cooling valve . . . . . . . . . . . . . . . . . . . 3-point output
Heating valve . . . . . . . . . . . . . . . . . . . 3-point or 2 stages
Fan control . . . . . . . . . . . . . . . . . . . . . Relay output 24 V / 2A
Room temperature . . . . . . . . . . . . . . . Thermistor input
Inlet air temperature. . . . . . . . . . . . . . Thermistor input
Discharge/mixed temperature . . . . . . Thermistor input
Wall module. . . . . . . . . . . . . . . . . . . . As selected
For further specifications, see technical data sheet.
DESCRIPTION
0-073-0591-0 TAC Xenta 104-A Roof Top Unit Controller
FUNCTIONAL FEATURES
•
Various applications:
Single-step control with
cooling, heating or
changeover operation for
cooling/heating. Two-step
control with sequential cooling
and heating.
•
Three-point control of the
heating and cooling valves.
•
Relay output for fan control.
•
Setpoint adjustment via a wall
module with set point adjuster
or via a L
ON
W
ORKS
®
network
variable.
•
Various modes of operation:
heating only, cooling only,
fan only, cooling/heating
(changeover), on, unoccupied,
standby and bypass.
•
Various types of fan
operation.
•
Configurable limit values MIN
and MAX limit the inlet air
temperature.
•
Alarm monitoring high or
low room temperature,
temperature sensor error, fan
error, etc.