Datasheet

97
Heating Controllers
TAC 2321
District Heating Compensator
The TAC 2321 offers combined heating and domestic hot water control for
district heating systems. The radiator circuit is controlled according to an
outdoor temperature compensated reset curve and reference sensor. The
domestic hot water is controlled by using a separate loading controller.
Simple symbols, a clear LCD display and a minimum number of buttons
make it easy to read and change the values. The reset curve has four adjust-
able curve points which mean that you can adjust it exactly to suit different
heating systems. A reference sensor is used to adjust the reset curve and the
duration and magnitude of the night setback automatically. Adjustments
resulting from seasonal variations are fully automatic.
FUNCTIONAL FEATURES
• Automatic adjustment of the
reset curve
• Ramp limitation of supply
setpoint
• Control of room temperature
via reference sensor
• Weekly program for night
setback
• Separate weekly program for
domestic hot water and hot
water circulation pump
• Weekend program for heating
and domestic hot water
• Variable night setback and
morning heating
• Optimized changeover from
daytime operation to night
setback and vice versa
• Separate limitation of return
temperature of heating and
domestic hot water
• Pump control with exercise
function
• Heat adjustment from
a remote control unit
(accessory)
• Extended daytime operation
and forced night setback from
an external unit, or from the
panel
• Domestic hot water control
with adjustable high
temperature function (to
eliminate the risk of legionella)
• Power limitation
• Alarm
SPECIFICATIONS
Power supply . . . . . . . . . . . . . . . . 230 V AC ±10%, 50–60 Hz
Power consumption . . . . . . . . . . . 5W
Overall dimensions . . . . . . . . . . . . 144 x 96 x 96mm (5.7” x 3.8” x 3.8”)
Real Time Clock
Accuracy at +25°C (77° F) . . . . . . ±12 minutes/year
Backup memory . . . . . . . . . . . . . . 48 hours
Enclosure rating . . . . . . . . . . . . . . IP 40, front IP 54
Ambient Temperature
Operating . . . . . . . . . . . . . . . . . . . 0°C to +50°C (32°F to +122 °F)
Storage . . . . . . . . . . . . . . . . . . . . . –20°C to +50°C (–4°F to +122 °F)
Ambient humidity . . . . . . . . . . . . max. 90% RH non-condensing
Thermistor Inputs
Thermistor type . . . . . . . . . . . . . . 1800 ohm/25 °C (77 ° F)
Measurement range . . . . . . . . . . . –30°C to +120°C (–22°F to +248°F)
Relay Outputs
Max. voltage . . . . . . . . . . . . . . . . 250 V AC
Max. current . . . . . . . . . . . . . . . . 2 A
Inputs
Sensor inputs - thermistor input (see above)
Remote control unit . . . . . . . . . . . 0–10 V DC
Dom. hot water valve . . . . . . . . . . 0–10 V DC or 2–10 V DC
Additional connection to outdoor temp., Y2 0–10 V DC
DESCRIPTION
200-2103-000 TAC 2321 Controller