KTRTB-251.108
Room thermostat, heating/cooling, surface-mounted super flat, 24V AC, silent (Triac)
This controller was specially developed for heating/cooling control in 2-pipe pipe systems for hotels, residential and commercial premises and can control up to 5 valve actuators (normally closed). The KTRTB detects the room temperature with an internal sensor and activates the heating or cooling according to the deviation from the setpoint. The use of a triac as a switching element instead of a relay/bimetal means that there is no switching noise during operation. With an internal switch, the existing contact input can be configured as an ECO contact or standby contact. ECO function: If this function is selected, the temperature is reduced by 3K in heating mode and increased by 3K in cooling mode. Standby function: If this function is selected, the controller is switched off (frost protection is still active). Surface/wall mounting (4-hole mounting on the flush-mounted box).
Art.-Nr.: MA700400
Technical data
| Actual temperature display | No |
| Additional heating switch | No |
| Ambient temperature, lower value | 0 °C |
| Ambient temperature, upper value | 40 °C |
| Assembly | Complete device |
| Bearing temperature, lower value | -20 °C |
| Colour | Pure white |
| Control behaviour | Switching PWM |
| Control range, lower value | 5 °C |
| Control range, upper value | 30 °C |
| Cooling control function | Yes |
| Degree of contamination | 2 |
| Depth | 13,9 mm |
| Design | Berlin 1000 |
| Display | No |
| ECO function (reduction) | Yes |
| ECO input (reduction) | 24 V AC, 50 Hz |
| Electric connection | Screw terminals |
| Electronic control | Yes |
| External setting | Yes |
| Heating / cooling switch | No |
| Heating control function | Yes |
| Height | 78,5 mm |
| Housing material | Plastic ABS |
| Maximum air humidity (non-condensing) | 95 % r.H |
| Maximum power consumption | < 0.8 W |
| Maximum switching current | 625 mA |
| Maximum switching voltage | 24 V AC, 50 Hz |
| Mechanical range reduction | Yes |
| Medium | Air, not aggressive |
| Minimum switching voltage | 24 V AC / 50 Hz |
| Mounting / attachment | Surface mounting |
| Number of control ranges | 1 |
| Number of outputs | 1 |
| Number of outputs, cooling | 1 |
| Number of outputs, heating | 1 |
| On / Off switch | No |
| Operating voltage | 24 V AC / 50 Hz |
| Operation | Rotary knob |
| Output signal | Switching PWM, 24 V AC, 50 Hz |
| Potential free switching contact | No |
| Proportional range | Approx. 1 K |
| Protection class | III |
| RAL colour number (similar) | 9010 |
| Safety and EMC | In accordance with DIN EN 60730 |
| Scale | Degree Celsius |
| Sealable | No |
| Sensor element | NTC internal |
| Sensor external | No |
| Surface properties | Gloss |
| Switch/lamp night-time reduction | No |
| Switching contact | NC contact |
| Switching difference | 0 K, as controlled almost constantly |
| Switching difference, can be adjusted | No |
| Switching element | Triac |
| Switching power | 15 W |
| Temperature controller version | Climate controller |
| Thermal feedback | No |
| Type of protection | IP30 |
| Width | 78 mm |
| With explosion protection | No |
| Circuit diagram | |
| Photo | Type | Articlenumber | Features | Kind |
|---|---|---|---|---|
 | ET-01 | MA990000 | Adjustment knob for devices in B1000 series, degrees Celsius scale, pure white, gloss | Spare part |
 | ZBOOA-040.100 | H9100000 | Heating valve actuator, 24V DC or 24VAC, closed when de-energised | Accessories |
 | JZ-21 | MN990006 | Adapter frame for device in Berlin 1000 series | Accessories |
 | ET-02 | MA990001 | Adjustment knob for devices in B1000 series, numerical scale 1...6, pure white, gloss | Accessories |
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