Alre-it Electric Climate Controller with Triac KTRTB-250.108

Manufacturer: Alre-it
Designation: Electric Climate Controller with Triac, surface-mounted, AP 30°C 24V
Type: KTRTB-250.108
Design: On/Off
Power Supply Type: 24 V AC
Connection: Other
With Receiver: No
Measuring Range: 5..30 °C
External Sensor: No
Thermal Feedback: None
Control Characteristic: Other
Suitable for Heating: Yes
Number of Heating Outputs: 1
Suitable for Cooling: Yes
Number of Cooling Outputs: 1
Differential Value: 0 K
Adjustable Differential: No
Temperature Readable: No
Sensor Type: Resistance Sensor
Mounting Type: Surface-mounted
With Display: No
Operation: Rotary
Contact Type: Normally Closed (NC)
Max. Voltage of Contacts: 24 V
Max. Contact Load: 0.625 A
Protection Class (IP): IP30
Explosion-Proof: No
Color: White
RAL Number: 9010
Height: 78.5 mm
Width: 78 mm
Depth: 13.9 mm

This controller has been specifically designed for heating and cooling control in 2-pipe systems for hotel, residential, and commercial spaces and can control up to 5 valve actuators (fail-safe closed). The KTRTB measures the room temperature with an internal sensor and activates heating or cooling based on the deviation from the setpoint. By using a triac as the switching element instead of a relay/bimetal, no switching noises occur during operation. An internal switch allows the existing contact input to be configured as an ECO contact or standby contact.

ECO Function: When this function is selected, the heating operates at a temperature 3 K lower and the cooling at a temperature 3 K higher.
Standby Function: When this function is selected, the controller is turned off (frost protection remains active).
Surface-mounted/wall mounting (4-hole fastening on a flush-mounted box).