The TAC 2222 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.Specifications
Power supply ...................... 24 V AC +20%, 50–60 Hz
Power consumption ........... 3W
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 (77º F) ........... ±12 minutes/year
Backup memory .............................. 48 hours
Thermistor Inputs
Type of thermistor ........................... 1800 ohm/ 25°C (+77º F )
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
