Datasheet

96
Heating Controllers
TAC 2242
Heating Compensator/
Optimizer
The TAC 2242 offers combined heating and domestic hot water control for
hot water 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 constant temperature
controller.
Simple symbols, a clear LCD display and a minimum number of buttons
make it easy to read and change the values. There are three adjustable curve
points where you can adjust the reset curve exactly to suit different heating
systems. A reference sensor is used to adjust the reset curve and the duration
and the night setback automatically. Adjustments resulting from seasonal
variations are 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
external unit
• Holiday program for heating
and domestic hot water
• Variable night setback and
morning heating
• Optimized changeover from
daytime operation to night
setback
• Separate limitation of return
temperature of heating and
domestic hot water
• Pump control with exercise
function
• Heat control using an external
unit (SPC control)
• Extended daytime operation
and forced night setback from
an external unit
• Domestic hot water control
• Alarm
SPECIFICATIONS
Power supply. . . . . . . . . . . . . . . . . . . . . . . . 24 V AC +20%, 50-60 Hz
Power consumption. . . . . . . . . . . . . . . . . . . 3W
Overall dimensions . . . . . . . . . . . . . . . . . . . 144 x 96 x 96mm
(5.7” x 3.8” x 3.8”)
Ambient Temperature
Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –20 °C to +50 °C
(–4 °F to +122 °F)
Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 °C to +50 °C
(32 °F to +122 °F)
Humidity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . max. 90% RH non-condensing
Real Time Clock
Accuracy at +25°C (77ºF) . . . . . . . . . . . . . . ±12 minutes/year
Backup memory . . . . . . . . . . . . . . . . . . . . . 48 hours
Enclosure rating. . . . . . . . . . . . . . . . . . . . . . IP 40, front IP 54
Thermistor Inputs
Type of thermistor. . . . . . . . . . . . . . . . . . . . 1800 ohm/25 °C (+77ºF)
Measurement range . . . . . . . . . . . . . . . . . . –50°C to +120°C
(-58º F to + 248º F)
Relay Outputs
Max. voltage. . . . . . . . . . . . . . . . . . . . . . . . 250 V AC
Max. current . . . . . . . . . . . . . . . . . . . . . . . . 2 A
Inputs
Sensor inputs B1-B4 thermistor input (see above)
Heat adjustment (SPC) . . . . . . . . . . . . . . . . 0–10 V DC
Domestic hot water valve . . . . . . . . . . . . . . 0-10 V DC or 2–10 V DC
Additional connection to outdoor temp. . . . 0–10 V DC
DESCRIPTION
200-2455-000 TAC 2242 Controller