Heating technology
Air conditioning
Radio systems
System technology
Building automation
Sensors
KTRRUu257.456#55/V2
Room thermostat with clock, heating/cooling, flush-mounted, 24 VAC/VDC, cover 55 x 55 mm, pure white, glossy
Flush-mounted controller for time-dependent heating/cooling control of 2- and 4-pipe systems in hotels, residential and commercial premises. Can be adapted to almost all surface switch programs thanks to different variants. Up to 5 valve actuators (normally open or closed) can be controlled per output. In 2-pipe operation, the operating mode can be switched via an external contact (change-over), temperature sensor or in the menu. The clock can be used as a master for other controllers for ECO switchover. The energy-saving function (ECO) or frost protection (STANDBY) can be activated via an external contact. Alternatively, the controller inputs can be configured for an external temperature sensor (weighting between internal and external sensor can be set) or a dew point sensor (TPS). A fan (EC fan) can be speed-controlled via a 0 … 10 V interface.
| Adaptive heating time start | Yes |
|---|---|
| Number of outputs | 3 |
| Number of outputs, heating | 1 |
| Number of outputs, cooling | 1 |
| Number of switching programs | 7 |
| Number of control ranges | 1 |
| Actual temperature display | Yes |
| Display type | illuminated, graphic display |
| Temperature controller version | climate controller |
| Clock version | digital |
| Output signal | switching/continuous, 0 … 10 V |
| External setting | Yes |
| Operation | touch-sensitive buttons |
| Rated impulse voltage | 500 V |
| Operating voltage | 24 VAC ±8 %, 50 Hz / 24 VDC ±20 %, 24 VAC, 50 Hz / 24 VDC |
| Design | |
| Display | Yes |
| ECO output (reduction) | 24 VAC, 50 Hz / 24 VDC |
| ECO input (reduction) | 24 VAC, 50 Hz / 24 VDC |
| ECO function (reduction) | Yes |
| Electric connection | screwed plug-in terminals |
| Energy efficiency class | I or IV |
| Colour | pure white |
| RAL colour number (similar) | 9010 |
| Sensor element | NTC internal, optional NTC external |
| Power reserve | 3 Days |
| Shortest switching time | 15 min |
| Bearing temperature | –20 … 70 °C |
| Max. air humidity (non-condensing) | 95 % r.H. |
| Housing material | plastic ABS, PC, PMMA |
| Max. power consumption | approx, 1 W (2,2 VA) |
| Max. switching voltage | 24 VAC, 50 Hz / 24 VDC |
| Max. switching current | 3 (0,5) A |
| Medium | Air |
| Min. switching voltage | 24 VAC, 50 Hz / 24 VDC |
| With receiver | No |
| Mounting/attachment | flush mounting (deep socket recommended) |
| Neutral zone | einstellbar |
| Surface finish | gloss |
| Party function | Yes |
| Control range | 5 … 40 °C, 5 … 40 °C |
| Heating control function | |
| Cooling control function | |
| Control behaviour | 2-point or PI-PWM |
| Switching differential | Heating/cooling: 1 … 2 K |
| Switching difference, can be adjusted | No |
| Switching element | |
| Heating/cooling switch | No |
| Switching contact | 2 normally open contacts |
| Potential free switching contact | No |
| Switching power | 72 W |
| Protection class | IP30 |
| Protection class | III |
| Sensor external | No |
| Safety and EMC | in accordance with DIN EN 60730 |
| Clock type | day/week |
| Ambient temperature | 0 … 40 °C |
| Type of wiring | other |
| Degree of contamination | 2 |
| Weather-dependent control | No |
| Dimensions (W x H x D) | 71 mm x 71 mm x 46 mm |
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