B meters HYDROCAL-M4 Assembly instructions

1Subject to change without prior notice
HYDROCAL-M4 •Operating and Installation Instruction
v1.131.08.2022
EN
The HYDROCAL-M4 is a compact thermal energy meter that measures the energy consumption of
heating and cooling systems.
The meter allows to measure the thermal energy passing into a hydraulic circuit used for heating
and\or for cooling, it also lets the acquisition through external module, of the volume measured by
up to 2 device (water, heat, gas, electricity, HCA) equipped with pulse emitter. The meter can also
be connected to a consumption reading network based on the wired M-BUS, Wireless M-BUS and
LoraWan network protocols.
The product must be stored in a dry place at temperatures between -20 °C and +70 °C (even during
transport). The duration of the storage should not exceed 1 year.
Combined heating or cooling meters are precision devices and must be protected from shock and
vibration.
STORAGE CONDITIONS
1. Introduction
WARNING
•Before proceeding with the installation and configuration of the product, carefully read
the instructions in this manual.
For further technical clarification, please contact Customer Service.
•Installation should be carried out exclusively by qualified personnel.
•The reference standard for the instrument is EN 1434 (1-6) and Directive 2014/32/EC (Annex
MI-004).
•Any tampering of the meter or removal of the seals will void the warranty provided.
•For proper energy accounting, always respect the mounting type prescribed (inlet pipe installation/
return pipe installation).
•The configuration of installation version and unit of measurement can be done with
the buttons or an Android device with NFC connectivity.
•Respect the installation point (input or output) of the instrument.
GENERAL INFORMATION
The first configuration chosen during installation (supply or return pipe) can’t be modified!
The top calculation/electronic unit must not be separated from the bottom brass case.
This meter contains potentially dangerous batteries, handle them with caution and do not disperse the
components in the environment.
The installation must be carried out by qualified personnel only. The manufacturer doesn’t assume any
responsibility for improper installation or damages caused by third parties.
PACKAGING CONTENT: HYDROCAL-M4 device, installation manual, antifraud kit

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2. Safety Information
Attention: this symbol highlights the instructions to be followed scrupulously for the correct
functioning of the combined heat and cooling meter.
Danger: the chapters marked with this symbol contain information that must be followed carefully
to avoid dangerous situations. Thermal energy meters are precision devices and must be protected
from shock and vibration.
Read all instructions carefully before proceeding with the installation! Failure to comply with
one or more of the procedures contained in the manual can be dangerous and cause damage to
property and people. It is recommended to comply with all applicable laws on safety and accident
prevention.
Notes: the notes indicated by this symbol contain tips to keep in mind when using the thermal
energy meter.
The warranty and validity of the verification become void if the identification plate or the seals
applied to the instrument are removed or damaged.
Remove the device from the package only at the time of installation to protect it from damage
and dirt.
The air transport of active radio devices is prohibited.
Carefully observe the instructions in the data sheet, instruction manual, application notes and
lid. Failure to comply with the operating conditions may result in situations of danger and for-
feiture of all claims of liability for defects as well as liability based on any guarantees expressly
granted. For more information visit the website www.bmeters.com.
Dispose of replaced devices and defective components in accordance with current environmen-
tal regulations.
Store out of the reach of children.
Observe national regulations relating to the measurement of cooling.
Observe the technical requirements relating to the installation of electrical equipment.
The instrument complies with the requirements of Directive 2014/30/EU of the European Coun-
cil on electromagnetic compatibility, Directive 2014/35/EU on electrical safety and Directive
RED 2014/53/EU.
If more than one instrument is installed in a unit, the installation conditions must be the same
for all instruments to ensure that consumption is billed as possible.

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Pay attention to the angular or sharp protrusions in the threads, flanges and measuring tube.
Therefore, it is recommended to wear protective gloves.
The device shall be used in such a way as to minimize the potential for human contact during
normal operation. To avoid the possibility of exceeding radio frequency exposure limits, human
proximity to receivers with integrated antenna should not be less than 20 cm (8 inches) during
normal operation.
Do not expose the meter to the sun and heat sources. Do not attempt to burn the device.
In case of danger of frost, empty the system and, if necessary, remove the meter.
To clean the device externally use a soft cloth and moistened with water. Do not wash with
high-pressure jets or soak the device in water. Avoid contact with oils and solvent. Do not use
alcohol or detergents.
Do not damage the casing of the device. In the event of collisions of blunt objects on the front
of the display, it can be irreparably damaged and lose the IP65 degree of protection. Install in
areas protected against impacts. If the protective casing breaks, contact customer service.
The display turns off. To activate it, press the button on the device. The display remains active
for 60 seconds.
The meter is not suitable for drinking water but is suitable for circulating water in central heating
systems. The quality of the water has to be as specified by the CEN/TR 16911 regulation.
Do not twist, wrap, extend or shorten the cables of the temperature probes and the cable that
connects the electronic unit to the part of the lower-case body.
The thermal energy meter can be installed only in areas protected from frost.
The thermal energy meter must be protected against pressure shocks in the pipeline.
Slowly fill the pipe with water at the end of the installation.
After installing the meter perform a leak test of the system.
Assemble or disassemble the meter only after depressurization of the system.
The meter does not have lightning protection.
Thermal energy meters do not require special protection against electrical interference; howe-
ver, electromagnetic interference must be avoided.
If transmission network interfaces are used, especially when cables are routed outside the
building, use increased protection against electrical interference.

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Rinse the pipes thoroughly before installing the meter.
The device must be installed pay attention to matching the direction of the arrow on the meter
brass body to the direction of the flow.
Avoid collecting air bubbles in the meter during the installation process.
The thermal energy meter must not be subjected to mechanical stress when installed in the
pipeline.
The meter must be installed in such a way as to be protected from all impurities and external
contamination.
Manually and simultaneously screw the device fittings on both sides, and then tighten in opposi-
te directions using a suitable device.
Remove old seals and clean the sealing surfaces.
Slightly grease the sealing surfaces (use grease approved by MID Standards).
Mount only the newly supplied gaskets (gaskets should not get in the pipeline). Seals provided
on site must be fit for purpose and comply with local guidelines and directives. B METERS
disclaim all liability for consequential damage resulting from the use of third-party gaskets, such
as corrosion of sealing surfaces and threads.
Problem Cause Solution
Display off, pressing buttons does
not respond The battery may be damaged or discharged Inform Customer Service
Damaged brass case or leakage Possible external impact or fall to the ground Inform Customer Service
Lower case brass separated
by electronic unit
Tampering by third party or strong external
impacts Inform Customer Service
Open and visible electronic unit Tampering by third party or strong external
impacts Inform Customer Service
No consumption is accounted Tampering by third party, strong external shocks
or damage to the flow detection sensor Inform Customer Service
Error 12 always present Damaged temperature probes Inform Customer Service
Error 18 or 19 always present Damaged temperature probes or out of system
temperatures limits Inform Customer Service
Does not transmit via radio Failure to pass 5 absolute liters or the batteries
may be damaged or discharged Inform Customer Service
TROUBLESHOOTING

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BEFORE INSTALLATION
3. Installation
Before the thermal energy meter installation make sure that the two ends of the inlet and outlet
pipe are perfectly aligned, clean them with the utmost care. Moreover, make sure there is a suitable
filter placed at the inlet and that clean and undamaged gaskets are inserted on both sides. The
thermal energy meters must be installed as specified by the CEN-TR 13582 regulation. Upstream
and downstream the meter install an appropriate water flow interception and regulation devices
suitable to allow inspection and maintenance of the meter, control of the water flow and eventual
sealing of the system.
Attention should be paid to the direction of flow. Install the thermal energy meter so that the
passage of water takes place in the direction indicated by the arrow in relief on the brass body and
respecting the prescribed position.
To ensure proper measurement, make sure that there is no air inside the pipe and that the flow is
clean and free of debris (potentially harmful to the meter turbine).
INSTALLATION
It is mandatory to comply with the prescribed
type of assembly (return pipe\supply pipe).
Always refer to what is on the meter menu 3
level 06. The figure below refers to a standard
version of the device installation (mounting on
return pipe) and positioned horizontally.
All versions of the thermal energy meter can be installed both horizontally and vertically. For
a better performance it is preferable, however, the horizontal installation with the turbine axis
perpendicular to the ground and the reading mechanism facing upwards.
Ideal position for a
better performance
Additional allowed positions
* This position is not suggested for cooling meters and in cases where moisture can enter the electronic
casing due to condensation (e.g. during an interruption of the plant in the summer)

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TEMPERATURE SENSOR INSTALLATION
INSTALLATION IN A SOCKET BALL VALVE INSTALLATION
The thermal energy meter is equipped with two digital probes that comply with the MID 2014/32/EC
directive and the EN1434 standard.
The HYDROCAL-M4 is equipped with dedicated sections for the measurement of thermal energy of a
heating/cooling circuit and the volume measurement given by the domestic hot and cold-water meters.
The meter is suitable for domestic applications with two-pipe systems, in a thermal power plant or any
other compatible application.
For a correct installation, always proceed in compliance with the directives prescribed by current
regulations.
In the standard version (e.g mounting on return pipe), the return probe is already incorporated inside the
brass case. The supply probe must be installed in a ball valve or in a socket mounted on the flow pipe
and complies with the requirements of the sensor itself.
Vice versa, the version for installation on the inlet pipe the probe inserted inside the brass case will be
the flow, the return probe will need to be installed in a valve or a socket on the return pipe.
For a correct temperature measurement, the tip of the probe must be in the center of the pipe. In
addition, the axis of the probe must be perpendicular to the pipe axis (see figure).
The temperature sensor must be sealed when the installation is complete.
Before installing the ‘free’ probe (the one not inserted in the meter case), it is necessary to intercept
the flow (close the ball valve or the appropriate shutters).
1. Screw the socket in the pipe
2. Insert the temperature sensor
3. Tighten the screw
1. Insert the probe into the threaded nut
2. Insert the closing pin
3. Unscrew the valve closing screw, and place the seal
4. Insert the probe by screwing it on the thread
4. Functionality

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In residential systems, usually with two pipes systems, the measurement of thermal energy takes place
on a single section both in heating and cooling cycle.
5. Display and buttons
The device is equipped at the front with an LCD and two buttons (T1 and T2), useful for device
initialization and readings
1) Eight-digit numeric field;
2) Single-digit numeric index (menu level);
3) Heating data index;
4) Cooling data index;
5) Circuit 1-2 pulse emitter (external module);
6) Return temperature index;
7) Indicator of sub level presence;
8) Supply temperature index;
9) Battery level indicator;
11) Flow presence indicator;
12) M-Bus wired communication data index;
10) Faults or NFC/IR active communication indicator;
The picture below reports a typical connection diagram (installation on return pipe):
13) LoRaWAN communication data index;
14) Historical index;
15) Pulse value index (k);
16) Measurement unit index;
T1) Levels selection button;
T2) Scroll button within the selected level;
12+13) Wireless M-Bus data index;

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1. Installation version (set Mode): select, through the left/right button (T1/T2), the type of installation
(supply or return). Holding down the right button for 3 seconds can temporarily confirm the choice
made by switching to level 2 (unit of measurement). If the T1 button is pressed for 3 seconds the
device will return to stock mode showing ‘SLEEP’ on display.
6. Commissioning
Premise: before a functional tests, the procedures indicated in this paragraph must be performed for
completing the physical installation phases including the connections.
If the activation takes place with buttons, the items in the menu will be two:
Long press
T2 button
or
Set mode
with both
buttons
Set unit
with both
buttons
or
or
or
or
Long press
T2 button
Long press
T2 button
Long press
T2 button
2. Units of measurement (set Unit): select through the left/right button (T1/T2), one of the following
items: 1 (Joule), 2 (MJ), 3 (GJ), 4 (kWh), 5 (MWh).
Holding down the right button for 3 seconds can temporarily confirm the choice made by switching
to level 2 (unit of measurement). If the T1 button is pressed for 3 seconds the device will return to
stock mode showing ‘set Mode’ on display.
NOTE: after confirmation the thermal energy meter will perform the initialization for heating and
cooling accounting. The unit of measurement can be changed later via NFC.
INITIALIZATION (Installation version and measuring unit already configured)
The first configuration chosen during installation (supply or return pipe) can’t be modified!
Press T2 button for three seconds to initialize the device, if the installation version and the unit of measurement
have already been configured as requested during the order.
The device is delivered in sleep mode and it must be configured if not requested during the order.
x=1
x=2
1
2

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7. Consultation menu
1) Check that the mounting position of the thermal energy meter and all electrical wiring are carried
out correctly
2) Check if the device is configured, otherwise set the installation version and the unit of measurement
3) Check at level 3 that all configured parameters are correct (heating and cooling data)
4) Check that the thermal energy meter, pulse devices, probes etc. are installed correctly (refer to the
specific installation manuals for each product)
5) Start the heating/cooling system:
→ Check the consistency of the reported values (energy and volume)
→ Check in level 2 the instant data
6) Check for errors
7) Apply installation seals. It’s recommended to lock the device with a password set through the
BMETERING NFC Config android app (downloadable from the Google Play Store).
PROCEDURE FOR COMMISSIONING
The consultation menu is divided into 9 levels by a numerical index always visible at the top left of the
display. By pressing the T1 button you can choose the desired level, while pressing the T2 button you
can view the sublevels of the preset level. After 60 seconds without iteration the display turns off. If no
button is pressed within 20 seconds (with the display off) the display cycle will start again from level 1.
If a button is pressed within 20 seconds (with the display off) the last level consulted will be displayed.
In any level or sublevel, holding down the T1 button for 3 seconds will direct the index to level 1. To
access to a sublevels, where present (indicate by the symbol ‘–‘), it is necessary to hold down the T2
button for 3 seconds. To return to a main level from a sublevel it’s necessary to hold down the T2 button
again for 3 seconds. Each level consists of a brief indication in letters of the data that will be shown after
a few seconds in a second screen.
1 INDEX INF UM
1.01 HEAT J,MJ,GJ,kWh,MWh
1.02 COOL J,MJ,GJ,kWh,MWh
1.03 HEAT m³
1.04 COOL m³
1.05 ABSOLUTE m³
1.06 FORWARD m³
1.07 REVERSE m³
1.08 IN 1 m³
1.09 IN 2 m³
1.10 LOST m³
2 INDEX INF UM
2.01 POWER H kW
2.02 POWER S W
2.03 HEAT J, Wh
2.04 FLOW m³/h
2.05 TEMP. SUPPLY °C
2.06 TEMP. RETURN °C
2.07 TEMP.DIFFERENCE °C
2.08 TEMP. AMBIENT. °C

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3 INDEX INF UM
3.01 SERIAL NUMBER
3.02 CRC FW
3.03 MAIN FW
3.04 RADIO FW
3.05 DISPLAY FW
3.06 INSTALL TYPE RETURN, SUPPLY
3.07 DATE
3.08 TIME
3.09 UNIT 1,2,3,4,5
3.10 IN 1 ON, OFF
3.10.1 PULSE RATE Type of pulse
3.10.2 START VALUE Type of pulse
3.10.3 MEDIUM Type of pulse
3.11 IN 2 ON, OFF
3.11.1 PULSE RATE Type of pulse
3.11.2 START VALUE Type of pulse
3.11.3 MEDIUM Type of pulse
3.12 MBUS ON, OFF
3.12.1 PRIMARY ADDRESS
3.12.2 SECONDARY
ADDRESS
3.12.3 BAUD RATE BPS
3.13 MONTHLY SAVE DAY
3.14 BIWEEKLY SAVE DAY
3.15 DATE SAVE MEM1
3.16 DATE SAVE MEM2
3.17 DATE SAVE ANNUAL
3.18 WMBUS TYPE WB, AMR, AMR
CUSTOM, OFF
3.19 LORAWAN ON, OFF
3.20 DISPLAY TEST
4 INDEX INF UM
4.01 MEMORY DAY 1
4.01.1 HEAT J,MJ,GJ,kWh,MWh
4.01.2 COOL J,MJ,GJ,kWh,MWh
4.01.3 IN 1 Type of pulse
4.01.4 IN 2 Type of pulse
4.02 MEMORY DAY 2
4.02.1 HEAT J,MJ,GJ,kWh,MWh
4.02.2 COOL J,MJ,GJ,kWh,MWh
4.02.3 IN 1 Type of pulse
4.02.4 IN 2 Type of pulse
6 INDEX INF UM
6.xx* MONTLY
MEMORY 1
6.xx.1 HEAT J,MJ,GJ,kWh,MWh
6.xx.2 COOL J,MJ,GJ,kWh,MWh
6.xx.3 IN 1 Type of pulse
6.xx.4 IN 2 Type of pulse
6.xx.5 AVG. FLOW
TEMP °C
6.xx.6 AVG. RET. TEMP °C
6.xx.7 AVG. CPU TEMP °C
6.xx.8 AVG. HEAT W
6.xx.9 AVG. FLOW m³/h
5 INDEX INF UM
5.01 METER LIFE h
5.02 START COUNTING h
5.03 HEATING HOURS h
5.04 COOLING HOURS h
5.05 NO DELTA HOURS h
5.06 NO ERRORS HOURS h
7 INDEX INF UM
7.xx* ANNUAL
MEMORY
7.xx.1 HEAT J,MJ,GJ,kWh,MWh
7.xx.2 COOL J,MJ,GJ,kWh,MWh
7.xx.3 IN 1 Type of pulse
7.xx.4 IN 2 Type of pulse
7.xx.5 AVG. FLOW
TEMP °C
7.xx.6 AVG. RET. TEMP °C
7.xx.7 AVG. CPU TEMP °C
7.xx.8 AVG. HEAT W
7.xx.9 AVG. FLOW m³/h
8 INDEX INF UM
8.01 Active errors
8.xx* Errors code
9 INDEX INF UM
9.xx* LOG mem errors
9.xx.1 Error data
9.xx.2 Error time
9.xx.3 Error count
* xx equals an incremental index
NOTE: In absence of historical data, levels 6-7-9 will show - - (text).

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8. Operating mode – Radio activation
This section describes the radio communication management implemented.
For more details see the separated WMBUS or LoRaWAN specification document.
The WMBUS or LoRaWAN radio will activate after the passage of ±5 litres.
Pre-configured radio parameters (WMBus): AMR, 200s , everyday from 0 to 24h, encryption disabled, no
historical data, standard package (standard data (heating energy, heating volume, errors, battery value
as a percentage).
RADIO INDICATOR ON DISPLAY
During the JOIN to the network procedure, if the LoRaWAN transmission has been activated, the radio
symbol will flash quickly on the display (at a period of 1 second) until the device reaches the JOINED
state and then remains always active. In the case of a failed JOIN the radio symbol turns off. In the case
of WMBUS mode only after switching +/- 5 liters the icon will remain permanently active. In
the case of wired M-BUS mode only after switching +/- 5 liters the icon will remain permanently
active.
9. Errors and faults
When one or more anomalies occur, the thermal energy meter will report the recorded error and show
the following icon on the display . If the NFC or IR interface is used, the icon will blink for the duration
of the communication.
The register of all the anomalies present is shown at level 8 of the consultation menu, where the
abbreviation Ern followed by two digits identifies the anomaly.*
Error Name Description
03 Qmax Overflow The error is triggered after the device operates at a flow rate greater
than Q4 for 10 consecutive minutes.
06 Reverse installation
During first installation only, if the absolute counting (forward counter -
reverse counter) is equal to 0 and a reverse flow (>10 Liters) is detected,
the alarm turns on.
08-09-10 Reserved Inform Customer Service
11 End of battery life The error is triggered when the remaining battery life is less than 1 year.
Permanent error, the icon is shown on display.
12 Probe failure Failure, short circuit or tampering on supply or return probe(s).
13-14-15-16 Reserved Inform Customer Service
17 Wrong Real Time Clock Is recorded when a sudden reset of date and time is detected.
18 Supply Measurement out
of range Measurement of the supply probe over the measuring range.

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Error Name Description
19 Return Measurement out
of range Measurement of the return probe over the measuring range.
21 Delta T
non-compliant
The error occurs when for 24 continuous hours without flow and Delta T
(temperature difference) > 10°C.
25 Display Overflow The error is triggered when the energy digits, based on the selected unit,
go further the maximum possible display.
26-27 Reserved Inform Customer Service
35 MBUS disconnected The error is triggered when MBUS communication is not detected for 2
consecutive hours.
36 Wrong module The error is triggered when the external module has been removed and
a second module is mounted.
37 Module removal The error is triggered when the module is not detected for 5 consecutive
failed communications.
38 End of battery life module The error is triggered when the remaining battery life of the external
module is less than 1 year.
39 Reserved Inform Customer Service
40 NFC Fraud The error is triggered when an NFC field is detected for more than some
minutes.
* For the optional alarms that can be activated and further details on the thermal energy meter refer to the complete User manual, available at www.
bmeters.com
10. Battery and replacement procedures
The thermal energy meter constantly monitors the status of the battery (maximum life: 10 years*)
and signals the imminent discharge by showing the icon on display . Reporting takes place one year
before full discharge.For more details see the separated WMBUS specification document.
For replacement, contact the manufacturer.
*The battery life strongly depends on the working time window, set during the configuration process, and on the
environmental conditions. Estimation of the battery life is given by the configuration software.
Do not recharge or replace the battery;
Do not open, puncture or damage the batteries;
Do not short-circuit the battery;
Do not expose the battery to temperatures above
85° C;
Do not use naked flames near the device;
Do not put in contact with water;
Do not insert into ovens, crush or cut: these actions
could cause an explosion or leakage of
flammable gases or liquids;
Always dispose of batteries in compliance with
current regulations;
The thermal energy meter uses non-rechargeable batteries that, if misused, can be potentially
dangerous. To reduce the risks, you should take the following precautions:

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Do not expose the battery to an extremely low
pressure environment which could cause an
explosion or a leak of gases or flammable liquids;
Always use original spare parts authorized by the
manufacturer;
11. Technical Data
Model Hydrocal M4
Power supply Battery-powered
Battery type Lithium, 2 x 2.7 Ah, 3.0V
Battery life Maximum 10 years
Range temperatures use +5 - +55°C
Storage temperature range -20 - +70°C
Degree of protection IP65
Dimensions 110 x 78 x 73 mm (DN15);
130 x 78 x 76 mm (DN20)
Weights 575g (DN15); 700g (DN20)
Approval 2014/32/EC MID (Module
B) - EN1434
Environmental class A (E1, M1)
Measurement temperature
range (heating) Θ: +1 °C - +90°C
Temperature range
difference (heating) ΔΘ: 3 K - 90 K
Measuring temperature
range (cooling)* Θ: +0.2 °C - +90°C
Temperature range
difference (cooling)* ΔΘ: 0.2 K - 90K
Counting operating
conditions (start)
Heating: ΔΘ≥1K (counting enabling
conditions)
Cooling: ΔΘ≥0.2K
Max. measurable
power 650 kW
Display LCD, 8 digits + icons
Units of
measurement J, MJ, GJ, KWh, MWh
Temperature
probes Digital
Probe cable length 1.5 m free probe
1 m internal probe
Pulse input 2 for impulsive device (external
module)
Pulse input class Class IA (default): Open Collector or
electromagnetic contact (reed).
Max. pulse input
frequency 5 Hz
Max. cable length
pulse input
devices
3 m
Installation Selectable by the customer, flow or
return on request.
Liquid supported Water
Accuracy class 2
qp\ qi ratio
Size qp (m³/h) Ratio qi (l/h)
DN15 0.6 50:1 12
DN15 1.5 50:1** 30
DN20 2.5 50:1** 50
* The thermal energy calculation for heating application is MID certified. The cooling energy calculation is not compliant with the MID regulation.
**On request 100:1

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This product falls within the scope of Directive 2012/19/EU on the management of waste electrical and electronic equipment (WEEE).
The appliance should not be disposed of with household waste as it is composed of different materials that can be recycled at the
appropriate facilities. Inquire through the municipal authority regarding the location of the ecological platforms suitable for receiving
the product for disposal and its subsequent correct recycling. The product is not potentially dangerous to human health and the
environment, but if abandoned in the environment it negatively impacts the ecosystem. The symbol of the crossed-out bin, present
on the label placed on the appliance, indicates the compliance of this product with the legislation on waste electrical and electronic
equipment.
12. Information for the correct disposal of the product
The abandonment of the equipment in the environment or the abusive disposal of the same are punishable by law.
B METERS srl
Via Friuli, 3 • Gonars 33050 (UD) • ITALY
E-mail (sales/info): [e-mail]
E-mail (support): [email protected]
Web: www.bmeters.com
Tel: [phone]
Tel: [phone]
Fax: [phone]
For the complete manual,
please refer to the product
page on our website →