Micropelt MLR003 Application guide
Copyright Micropelt
Heating Radiator Thermostat
MLR003RiEU61-07-1.1
LoRaWAN CLASS A EU868MHz SF7BW125
User Manual and Device Specification
The Micropelt MLR003R product series has been designed for use with heating radiators and M30x1,5
valve thread. LoRaWAN allows to control heating radiators over long distances, even inside buildings.
Significant cost savings on labor and material cost for wiring, network infrastructure, buildingstructural
changes will reduced the amortization time over conventional systems while installing the system is only
a matter of days.
For inquiries please visit us at: Customer Service Portal
1 Revision History MLR003RiEU61-07-1.1 ................................................................................................... 3
2 Use and Safety MLR003R .......................................................................................................................... 5
3 General Description MLR003R .................................................................................................................. 6
4 Operating Modes MLR003R....................................................................................................................... 8
5 Power Consumption MLR003R............................................................................................................... 10
6 Power management MLR003R ............................................................................................................... 11
6.1 Energy Harvesting................................................................................................................................... 11
6.1.1 Device power management.................................................................................................................... 11
6.1.2 Energy Storage ........................................................................................................................................ 12
7 Forced Heating MLR003R........................................................................................................................ 15
7.1 Slow Harvesting ...................................................................................................................................... 15
8 Communication Profile MLR003RiEU61-07-1.1 ..................................................................................... 16
8.1 FPORT 0x01 UPLINK: MLR003RiEU61-07-1.1 to Controller / Network Server ...................................... 17
8.2 FPORT 0x01 DOWNLINK: Controller / Network Server to MLR003RiEU61-07-1.1 ................................ 20
8.3 FPORT 0x02 REV Number, Hardware and Firmware Version MLR003R................................................ 24
8.4 FPORT 0x03 Motor operating range MLR003R....................................................................................... 25
8.5 FPORT 0x04 LoRa Spread factor MLR003R............................................................................................. 26
8.6 FPORT 0x05 Slow Harvesting SH and Valve Opening Point Detection OPD MLR003R ........................ 27
9 Operating Instructions MLR003R ........................................................................................................... 28
9.1 User Interface functionality.................................................................................................................... 28
9.2 Setting up a Gateway.............................................................................................................................. 28
9.3 Pairing the Device with a Room Controller or Gateway........................................................................ 29
9.4 Mounting Position and OFF .................................................................................................................... 29
9.5 Attaching and Activating a unit .............................................................................................................. 29
9.6 Reset (from Normal Operation only)...................................................................................................... 30
9.7 No Reset from Mounting Position .......................................................................................................... 30
9.8 Removal from the Valve.......................................................................................................................... 30
9.9 Temperature Control Loop..................................................................................................................... 30
9.10 Antifreeze................................................................................................................................................. 30
9.11 Battery Charging Flow Chart .................................................................................................................. 31
10 Performance Data MLR003RiEU61-07-1.1.............................................................................................. 32
11 Mechanical Interface to circulation valve body MLR003R .................................................................... 35
12 CE Conformity MLR003RiEU61-07-1.1.................................................................................................... 36
13 Labeling MLR003R................................................................................................................................... 37
13.1 Product Label .......................................................................................................................................... 37
13.2 NFC Tag Label.......................................................................................................................................... 38
14 Accessories MLR003 ................................................................................................................................ 39
14.1 MLR003-KEY Magnetic switch................................................................................................................. 39
Copyright Micropelt
Revision History MLR003RiEU61-07-1.1 – 3
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1 Revision History MLR003RiEU61-07-1.1
Rev.-No. Description of Revision Revised
by
Date
v8e has been derived from the Micropelt technology
platform description v7e.
Changed name to MLR003.
Document describes the first release of MLR003.
Most recent changed against the general-purpose
platform description.
v8e Removed Summer mode
Added 480min RF CI in Payload
Added temperature offset for valve- and ambient-
sensor.
Added harvesting halt during radio communication.
Schmidt/
Volkert
Jan. 21, 2021
v10e Change product name to MLR003
General update on description and user guide
Volkert Jun. 21, 2021
v11e Change downlink payload
Added Label spec.
Couzens
Volkert
Jun. 22, 2021
v12e Change Activating from Mounting Position operating
flow diagram
Changed front page picture of MLR003
Couzens
Volkert
Aug. 04, 2021
Aug. 20, 2021
v13e Full document review
Update cover page, headlines, added sect. 7.2
Couzens
Volkert
Sept. 22, 2021
Sept. 23, 2021
v14e Adjust speaker beeping communication in user
interface
Added SF7BW125 to front page
Removed downlink “reserved” bytes 7 and 8
Added picture of MLR003-KEY
Couzens
Volkert
Sept. 28, 2021
Oct. 11, 2021
Copyright Micropelt
Revision History MLR003RiEU61-07-1.1 – 4
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•
V15e Added clauses and information required by product
safety, EN60335-1:2012.
Described the position of the labels
Corrected distortion of “CE”-print on product label
Schmidt Nov. 05, 2021
V16e Added certification details
Added contact email
Corrected NFC-Tag label (16.2)
Volkert Nov 19, 2021
v17e Update from Rev1.0 to Rev1.1:
Extend Uplink payload to include User Mod and User
Value
Extend motor Reference Run travel distance
Added declaration of conformity (CE)
Couzens
Volkert
Jan. 24, 2022
Added new section 09.11 Battery Charging Flow Chart Bala Feb 16, 2022
Changed product name and article number to
MLR003RiEU61-07-1.1
Volkert Feb 23, 2022
Copyright Micropelt
Use and Safety MLR003R – 5
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2 Use and Safety MLR003R
Use and safety instructions:
This appliance is not intended for use by persons (including children) with reduced physical, sensory or
mental capabilities, or a lack of experience and knowledge, unless they have been given supervision or
instruction concerning the use of the device by a person responsible for their safety.
This product is not a toy. Children shall be advised to refrain from playing with it.
The metallic part of the unit’s housing serves as a heat sink. Be sure that the air circulation around it is not
obstructed by furniture, curtains, plants, or any other object.
If the device has been stored in a cold environment, make sure that it resumes close to room temperature
before use. This is to prevent damaging due to condensation.
The thermostatic head is designed for indoor use only. Do not allow the thermostatic head to get wet. Its
sensitive electronics can be affected.
The unit is best cleaned with a dry or slightly damp cloth. Do not use aggressive cleaning agents or solvents.
Refrain from exposing the unit to environmental stress such as high mechanical forces (do not step on it),
strong vibrations, direct sunlight or extreme temperatures.
The unit must not be disassembled or modified. There are no user-serviceable parts inside.
Be aware that correct operation can be affected by strong electromagnetic fields. Typical sources of such are
mobile phones, 2-way radios, RC transmitters, microwave ovens, electric motors.
The thermostatic head has been designed and must solely be used for the purpose of controlling a M30 x 1.5
circulation valve. Any other use may pose a hazard to the device itself, to the equipment involved, or to the
health of the user.
When operating the device in a workplace environment, be sure to observe the workplace regulations that
may apply.
Intended use: The self-powered thermostatic head is suitable solely for controlling water-filled heating
radiators. Any other use – including control of floor heating systems – is not permitted and can result in
malfunctions or damage. Do not disassemble or modify any part of the product. It is important to comply
with the safety notice included in these operating instructions.
In case of questions, please contact us:
https://micropelt.atlassian.net/servicedesk/customer/portal/1
Copyright Micropelt
General Description MLR003R – 6
3 General Description MLR003R
This document defines the properties of Micropelt’s maintenance free, intelligent thermostatic head
MLR00RiEU61-07-1.1. This MLR003 is used for control of heating radiators with standard valve connection
M30x1.5 (Section 10).
MLR00RiEU61-07-1.1 is an 868MHz LoRaWAN CLASS-A wireless actuator operating in SF7BW125.
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. SF7 is using the shortest time-on-air to maximize the number of end
nodes operating on one gateway.
Each standard production MLR00RiEU61-07-1.1 unit has a unique DEVEUI, APPEUI (JOINEUI) and a
randomly generated APPKEY. Device credentials are secret and will only be submitted with the product
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. 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 sensor to determine the flow pipe temperature. A
controllable 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.
Copyright Micropelt
General Description MLR003R – 7
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.
The actuator generates the required electrical energy for operation (motor, sensors, and radio
communication) by means of a built-in thermoelectric generator (TEG) and therefore operates
maintenance-free. It harvests energy from the temperature difference between the valve body heat and
ambient temperature (usually room temperature). An additional energy source such as a primary battery
or external power supply is not required. The internal energy storage device is charged upon delivery, so
that sufficient energy is available for installation.
Copyright Micropelt
Operating Modes MLR003R – 8
4 Operating Modes MLR003R
Installatio
n cycle
Standard
operation
Idle state Radio
failure
Forced
heating
Freeze
Protection
Comments Valve target
%
Or
Room
target
temperatur
e
Phases
between
monitoring
and
communica
ting
Transmit
messages
not
received by
the
gateway
Valve opens
to 50%
(or remains
in current
position if
current
position is
>= 50%)
Valve opens
to 95%
Trigger Magnetic
switch.
Join accept
from
Gateway,
& Device is
mounted
Internal
timer
Internal
timer
From
activation:
No Gateway
connect
from
standard
operation: 6
consecutive
Gateway
communica
tion failures
Battery
voltage < 2V
Flow sensor
raw
temperatur
e
<= 6°C
Radio
communic
ation
interval
(RCI)
10 seconds
for 5
minutes
5 minutes
10 minutes
60 minutes
120
minutes
480
minutes
OFF Three times
30 seconds
Then once 2
minutes
Then 60
minutes
OFF OFF
Dynamic
change of
communic
ation
interval
No Yes No No No No
Copyright Micropelt
Operating Modes MLR003R – 9
Sensors
(flow,
ambient)
Active,
every 10
seconds
Active OFF
Active OFF Active,
every
2 minutes
Freeze
protection
Active,
every 10
seconds
Active,
every 150
seconds
OFF Active,
every 150
seconds
OFF Active
Motor
operation
Reference
run.
Then active,
according
to Radio
Communica
tion
Active,
according
to
Radio
Communica
tion
OFF Active OFF OFF
Monitoring
of battery
Active,
every 10
seconds
Active OFF Active Active,
every 12
hours
Active,
every
2 minutes
Internal
temperatu
re
controller
If User
Mode is Set
Point
Ambient
Temperatur
e: active
If User
Mode is Set
Point
Ambient
Temperatur
e: active
OFF If Safety
Mode is Set
Point
Ambient
Temperatur
e: active
OFF OFF
Default
upon
activation
and no
downlinks
Setpoint
ambient
20°C
Setpoint
ambient
20°C
Setpoint
ambient
20°C
Copyright Micropelt
Power Consumption MLR003R – 10
5 Power Consumption MLR003R
Function Power consumption
average current draw
Battery runtime
w/o active harvesting
@ 500mAh**
Mounting position 2.2 µA 25.9 years
Radio communication every 10 min.
No motor = unheated room
n.n µA n.n years
Radio communication every 10 min.
Motor movement: Morning: Full open
Throughout the day: 10% every 30 min.
Evening: Full close Total: 400%
nn.n µA n.n years
Copyright Micropelt
Power management MLR003R – 11
6 Power management MLR003R
6.1 Energy Harvesting
The actuator obtains the electrical energy required for operation by means of a thermoelectric generator
(TEG), from the temperature difference between the heating flow temperature and the room
temperature. During active flow temperatures, excess energy is accumulated in the internal storage. The
energy balance of the actuator is designed to allow operation through 366 days per year when used in
typical circulation strands with hot water supply throughout the year. A lack of hot water operation as it
occurs in down times or malfunctions inevitably leads to the internal storage being discharged, which
means that permanent and normal operation of the device can no longer be guaranteed.
6.1.1 Device power management
MLR003RiEU61-07-1.1 allows the end user application to monitor and compute the energy status through
regular measurement of the device internal parameters. Internal storage voltage STV (V) and average
current generated ACG (µA) are actual measured values whereas average current consumed ACC (µA) is a
computed value. The computed average current consumed value includes motor amount and direction
of movement, radio communication frequency, and sleep current. The following two diagrams are
illustrations of the energy balance from a running application.
Copyright Micropelt
Power management MLR003R – 12
1 Exemplary values for ACC, ACG and computed energy balance.
2 Exemplary values for STV and computed energy balance.
6.1.2 Energy Storage
Using its status bit "Energy Storage", the unit indicates that its long-term operation consumed more
energy than it generated. The remaining charge level at this point is approximately 25%, which is why the
device continues with full functionality while signaling a negative energy balance to the user. It is
strongly recommended to regularly check the ES bit in order to recognize a discharge of the storage and
Copyright Micropelt
Power management MLR003R – 13
to prevent its progression by suitable measures (e.g. regular, short heating intervals outside of the
standard operating times). If the energy storage continues to discharge and its voltage falls below a
certain limit, then the unit automatically goes into the state of forced heating.
Energy storage typical voltage values Voltage [V] LTO
Fully charged – for charge stop (bq25505 and USB) 2.8
Fully charged – for indicator bit 2.7
Normal operation 2.4 typical (2.0 … 2.8)
Energy storage bit set when below 2.3
Forced heating starts when falling below 2.0
Forced heating ceases when rising above 2.4
Microcontroller turning off all loads and its own power when falling
below
1.8
Microcontroller power-up (under hardware-control) when rising above 2.37
Battery spec HTC1450 (capacity / charge stop / discharge stop) >500mAh / 2.8V / 1.5V
Copyright Micropelt
Power management MLR003R – 14
3 Illustration of battery discharge curves from different starting point and ES bit activation
Copyright Micropelt
Forced Heating MLR003R – 15
7 Forced Heating MLR003R
Forced heating is defined as the state that the actuator assumes when it can no longer maintain normal
operation due to the discharge of its internal energy store (Storage voltage level <2V). Instead, it takes a
protective position in heating mode to avoid possible freeze damage. For this purpose, the actuator
opens the valve to 50% or maintains the current position if it is more than 50%. The unit then deactivates
itself into a state of minimal energy consumption: No radio or motor activities, local inputs are ignored. It
remains in this state until the storage is recharged to a sufficient level by the thermoelectric generator. In
this operating mode, the unit cannot be addressed neither by radio nor locally, and temperature
fluctuations in the room will likely occur. As soon as sufficient charge level is available, the actuator stops
the forced heating and resumes normal operation. Restoring the storage device to full charge requires
full heating operation for several days, which is why this condition should be avoided by taking
appropriate measures in advance (monitoring the ES bit, Slow harvesting).
7.1 Slow Harvesting
Only supported in MLR003RiEU61-07-2.0
Copyright Micropelt
Communication Profile MLR003RiEU61-07-1.1 – 16
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8 Communication Profile MLR003RiEU61-07-1.1
FPort Number Type of operation Payload length Description Comments
0x00 MAC Commands 8 Bytes RESERVED
0x01 Valve position %
mode
Temperature
setpoint mode
(°C) with ambient
or external
temperature
sensor
Downlink:
6 Bytes
Uplink:
11 Bytes
Actuator
operation mode
with valve
position % only
Self-regulation
mode using the
requested
ambient setpoint
temperature
Strongly
recommended
to always use
an external
temperature
sensor
0x02 Report REV
Number, Hardware
and Firmware
Version
Downlink:
()
Uplink:
6 Bytes
Request REV
Number, Hardware
and Firmware
Version
Only
supported in
MLR003RiEU6
1-07-2.0
0x03 Motor operating
range
Downlink:
1 Byte
Uplink:
1 Byte
Set/change motor
operating range
(mm) from default
value 2,56mm
Only
supported in
MLR003RiEU6
1-07-2.0
0x04 LoRa Spread
Factor
Downlink:
1 Byte
Uplink:
1 Byte
Set/change LoRa
spread factor from
default value
Only
supported in
MLR003RiEU6
1-07-2.0
0x05 Slow Harvesting
(SH) and Valve
opening point
detection OPD)
Downlink:
1 Byte
Uplink:
1 Byte
Activate and report
OPD, activate/
deactivate Slow
Harvesting
Only
supported in
MLR003RiEU6
1-07-2.0
Copyright Micropelt
Communication Profile MLR003RiEU61-07-1.1 – 17
8.1 FPORT 0x01 UPLINK: MLR003RiEU61-07-1.1 to Controller / Network Server
BYTE BIT RANGE SIZE OFFSE
T
ABB
REV.
DETAILS
1DB0.7…0.0 8 0 CVP Current Valve Position %
0x00 … 0x64 / 0 … 100%
Res = 1%
2DB1.7…1.0 8 8 FSR
V
Flow Sensor RAW Value °C
0x00 … 0xFF / 0 … 125.0°C
Res = 0.5°C
3DB2.7…2.0 8 16 FTM
P
Flow TEMPERATURE Value °C
0x00 … 0xFF / 0 … 125.0°C
Res = 0.5°C
4DB3.7…3.0 8 24 ASR
V
Ambient Sensor RAW Value °C
0x00 … 0xFF / 0 … 63.75°C
Res = 0.25°C
5DB4.7…4.0 8 32 ATM
P
Ambient TEMPERATURE Value °C
0x00 … 0xFF / 0 … 63.75°C
Res = 0.25°C
6DB5.7 1 40 RESERVED
DB5.6 1 41 ES Energy Storage is low
1 = Battery is low
DB5.5 1 42 HA Harvesting
1 = Harvesting is active
DB5.4 1 43 ASF Ambient Sensor Failure
1 = Sensor Failure
Copyright Micropelt
Communication Profile MLR003RiEU61-07-1.1 – 18
DB5.3 1 44 FSF Flow Sensor Failure
1 = Sensor Failure
DB5.2 1 45 RCE Radio Communication Error
1 = Radio Loss
DB5.1 1 46 RSS Radio Signal Strength
0 = Normal Radio Signal (RSSI is greater than
-100 dBm)
1 = Weak Radio Signal (RSSI is less than -100
dBm)
DB5.0 1 47 ME Motor
1 = Motor Error
7DB6.7…6.0 8 48 STV Storage Voltage V
0x00 … 0xFF / 0 … 5100mV
Res = 20mV
8DB7.7…7.0 8 56 ACC Average Current Consumed
0x00 … 0xFF / 0 … 2550µA
Res = 10µA
9DB8.7…7.0 8 64 ACG Average Current Generated
0x00 … 0xFF / 0 … 2550µA
Res = 10µA
10 DB9.7 1 72 OFF Operating Condition
0 = Device is in Normal Operation and is Active
1 = Device is in Mounting Position and OFF
DB9.6 1 73 SFC Storage Fully Charged
1 = Fully Charged
DB9.5 1 74 RESERVED
Copyright Micropelt
Communication Profile MLR003RiEU61-07-1.1 – 19
DB9.4 1 75 REF
C
Reference Run Completed
1 = Successfully Completed
DB9.3…9.2 2 76 RESERVED
DB9.1…9.0 2 78 UM User Mode
As set by the last received Downlink (DB3.3…
3.2)
0b00 Valve Position %
0b01 RESERVED
0b10 SP Ambient Temperature °C
0b11 RESERVED
11 DB10.7…
10.0
8 80 UV User Value according to User Mode
As set by the last received Downlink (DB0.7…
0.0)
VALVE %: 0x00 … 0x64 / 0 … 100%
Res = 1%
AMB TEMP: 0x00 … 0x50 / 0 … 40°C
Res = 0,5°C
Copyright Micropelt
Communication Profile MLR003RiEU61-07-1.1 – 20
8.2 FPORT 0x01 DOWNLINK: Controller / Network Server to MLR003RiEU61-07-1.1
BYTE BIT
RANGE
SIZE OFFSE
T
ABBREV. DETAILS
1DB0.7
…0.0
8 0 SPV Set Point Value according to User Mode
VALVE %: 0x00 … 0x64 / 0 … 100%
Res = 1%
AMB TEMP: 0x00 … 0x50 / 0 … 40°C
0x00 = Default = 0x28 = 20°C
Res = 0,5°C
2DB1.7
…1.0
8 8 RT Room TMP from RCU °C
0x00 … 0xA0 / 0 … 40°C
0x00 = No Room TMP provided
Res = 0,25°C
3DB2.7
…2.0
8 16 SSV Set Safety Value according to safety mode
AMB TEMP: 0x00 … 0x50 / 0 … 40°C
0x00 = Default = 0x28 = 20°C
Res = 0,5°C
VALVE %: 0x00 … 0x64 / 0 … 100%
Res = 1%
4DB3.7 1 24 RESERVED
DB3.6
…3.4
3 25 RCI Radio Communication Interval
0b000 = Default = 10 minutes
0b000 10 minutes
0b001 5 minutes
0b010 60 minutes
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