This document defines the properties of Micropelt’s maintenance free, intelligent thermostatic head MLR003FiEU61-12-1.2. This MLR003 is used for control of domestic hot water circulation valves in circulation strands with standard valve connection M30x1.5 (Section 10).
MLR003FiEU61-12-1.2 is an 868MHz LoRaWAN CLASS-A wireless actuator operating in SF12BW125. LoRaWAN end-devices of Class A allow for bidirectional communications whereby each end-device’s uplink transmission is followed by two short downlink receive windows. The transmission slot scheduled by the end-device is based on its own communication needs with a small variation based on a random time basis (ALOHA-type of protocol). Class-A operation is the lowest power end-device system for applications that only require downlink communication from the server shortly after the end-device has sent an uplink transmission. Downlink communications from the server at any other time will have to wait until the next scheduled uplink. SF12 is the longest time-on-air operating to maximize the wireless communication range.
Each standard production MLR003FiEU61-12-1.2 unit has a unique DEVEUI, APPEUI (JOINEUI) and a randomly generated APPKEY. Device credentials are secret and will only be submitted with the product delivery. Questions related to device credentials can be sent to devicecredentials@micropelt.com.
To operate the device, the unit must be paired with a compatible controller or gateway unit supporting its communication profile (Section 7). The pairing is done as described in Section 8.3. Once mounted and activated on the valve body using the magnetic key, a calibration cycle starts to automatically adapt itself to the individual valve. Then it is ready for use. Adapters are available for a majority of non-M30x1.5 valve bodies.
Success of activation or deactivation is signaled by tone signals and LED (Section 8.1).
The product is delivered in mounting position (off) with the valve plunger completely retracted. When operating, the unit recognizes if it is installed on a valve body by means of internal force and travel distance measurement. The device has built-in motor error detection "ME". The ME bit signals motor issues during normal operation.
The actuator operates with a communication profile as further specified in Section 11. The default radio communication cycle is 10 minutes. Default operating mode is Setpoint Temperature Flow and Default Setpoint value is 57°C. Installation, activation and a successful join with the network server will immediately set the radio communication interval to every 10 seconds for an installation period of 5 minutes to provide rapid feedback. Temperature values are transmitted in both raw and corrected temperature formats.
The actuator has a built-in, valve-side temperature used with its internal p-type temperature controller to regulate the domestic hot water temperature. A controllable offset with Default flow sensor offset of +5°C has been added to compensate for the temperature drop between the hot water and the sensor element located in the actuator’s aluminum valve adapter. The device transmits a variety of information to the control unit by sending an uplink (Section 7.1). The control unit responds by sending a downlink (Section 7.2).
The integrated valve side temperature sensor is also used for freeze protection. Freeze protection is activated at <=6°C.
The ambient sensor is used to measure the room temperature. During heating operation, the ambient sensor is influenced by self-heating of the metallic device housing. The algorithm used to estimate the actual ambient temperature is described in Section 12.9.
Unsuccessful radio communication attempts are reported by status bit RCE. After 6 consecutive unsuccessful radio communication attempts (acknowledge from the gateway), the actuator automatically switches to the safety mode and safety values as specified by the user. In this situation, the radio communication period is increased to once every hour.
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