CALEFFI CONTECA EASY ULTRA User manual

01307/19 GB
Technical specications
- Electric supply: 24 V (+10 % / -5 %) (ac) - 50 Hz - 1 W
- Data transmission: M-Bus protocol on BUS RS-485 (default)
MODBUS protocol on BUS RS-485 (on request)
- Tamper-proof protection
- Advanced control software
- Conformity: Directive 2014/32/EU EN 1434 (MI004)
Standard installation
Product range
7507 series Heat meter with threaded connection size 1/2”–1 1/2”
7507 series Heat meter with anged connection size DN 50–DN 200
Code 755010 TOUCH-screen controller
Code 750450 EASY datalogger
Code 750350 EASY TELE datalogger
7558 series Additional options
Function
CONTECA® EASY ULTRA is an ultrasonic heat meter, especially
suited to measuring thermal energy consumption in residential
buildings; thanks to a double memory register, it can also meter
energy in both heating and cooling modes (option code 755810).
The device comprises an electronic calculator unit, an ultrasonic
ow meter and two temperature probes. The CONTECA® EASY
ULTRA meter is extremely simple to install and requires no special
maintenance.
The ow is measured using the two-way ultrasound technique, based
on the transit time method. As it has no moving parts, the device
is therefore not very susceptible to build-up issues and offers an
extremely low pressure drop.
The CONTECA® EASY ULTRA meter is equipped with an 8-digit LCD
display that can be switched on with a key. This display enables easy
reading of both energy consumption values and technical data, for
appliance operating status evaluation and data logging.
The CONTECA® EASY ULTRA meter is able to acquire up to 4
additional pulse inputs and two additional alarm-status digital inputs,
and is equipped for centralised teletransmission (max. 250 users) in
M-Bus protocol, on the RS-485 network. The device also supports
MODBUS RTU protocol.
CALEFFI
RS485
EASY
CONTECA
EASY
M07 1259
07185865
1
CONTECA®EASY ULTRA direct heat meter
MID Directive - Bus RS-485 transmission
7507 series

Temperature probes
Flow probe length
Return probe length
Probe type
Working temperature range limits
Temperature difference limits
Measurement sensitivity
Flow meter
Dimensions/Connection
Body
Type of hydraulic connection
Nominal pressure
Max. temperature of the medium
Mounting
Pulse output
Permanent ow rate
Minimum ow rate
Maximum ow rate
Electric supply
Microprocessor calculator unit
Metrological specications
Accuracy class
Centralised transmission
Ambient temperature range limits
Ambient classication
Energy unit of measurement
Electric supply
Protection class
Pulse inputs
Technical specications
in compliance with EN 1434-1 - MID 2014/32/EU
class 2
according to M-Bus/ MODBUS RTU protocol on RS-485
5–45
MID 2014/32/EU E1-M1
8-digit display
24 V (+10 % / -5 %) (ac) - 1 W - 50 Hz
in accordance with DIN 40050: IP 54
class IB in accordance with EN 1434-2
1,9
1,9
NTC
10–90 (HEATING) - 2–25 (COOLING)
3–80 (HEATING) - 3–20 (COOLING)
≤0,05
bar
°C
l/h
l/h
l/h
°C
kWh
PN
Qp
Qi
Qs
m
m
°C
K
°C
90
preferably horizontal
class OA-OC in accordance with EN1434-2
see table 1 and 2
see table 1 and 2
see table 1 and 2
lithium battery, life 12 years
p
Code
The CONTECA®heat meter is supplied with accessories for installation, probes positioning and subsequent lead sealing.
Code
DN G
F
E
C
ABDDN A CB D PN
PN
2 x Y-pockets (the flow pocket is fitted with a strainer mesh)
TABLE 1 - Flow rate limit - Connections from 1/2” to 1 1/2”:
Code Connections Code Connections
2 x 1/2” weld sleeves with brass pocket to 1 lead sealing kit
* vertical installation
* vertical installation
TABLE 2 - Flow rate limit - Connections from DN 50 to DN 200:
1000 100
DN 125 100
1500 150DN 150 100
2500 250
100
150
250DN 200 100
100
Qs
Qs
750704
750705
750706
750707
750708
750709
750710
750711
750712
750713
750714
750715
Q /
p
100*/250
100*/250
p
Q /
p
Dimensions
2
Flanged EN 1092-1 Male thread ISO 228
Brass
DN 125–DN 200
1/2”–1 1/2” DN 50–DN 100
Steel P235GH
PN 16 PN 16 PN 25
N.B. The ow meter must be installed between two rectilinear sections, measuring 10 times the pipe diameter upstream and 3 times the pipe diameter downstream.

Guidelines for rst installation
It is good practice to install shut-off valves upstream and downstream from the meter in order to facilitate installation and maintenance, if
required.
A ltering device must be provided upstream of the ow rate meter in order to protect the meter.
With a diameter of 1/2” to 1 1/2”, this strainer is already inside the ow temperature pocket.
Installation procedure
• Install the hydraulic components (probe pocket and ow meter) in accordance with the guidelines provided in paragraph “Hydraulic installation
diagrams” on this page;
• After installation, wash the pipes and carry out a pressurised test;
• Check the saturation level of the strainers and, if necessary, clean them;
• After completing installation of the hydraulic parts, install the CONTECA®EASY ULTRA electronic unit: follow the instructions for electrical
connection on pages 5 and 6.
• Insert the temperature probes into the corresponding pockets in line with the ow direction: the ow probe (red label) must be installed on the
ow pipe, while the return probe (blue label) should be on the return pipe.
• At the end of the installation process the main heat meter components (electronics unit, temperature probes and volume meter) should undergo
lead sealing. Lead sealing must be performed by qualied technicians in accordance with the instructions on pages 9 and 10 (“Lead
sealing procedure”).
1) Guideline diagram of the system with metering on the multiple circuit manifold.
EASY
CONTECA
EASY EASY
CONTECA
EASY EASY
CONTECA
EASY
M071259 07185865
M071259 07185865
M07 1259 07185865
Hydraulic installation diagrams
The ow meter must be tted on the return pipe.
The hydraulic diagrams provided below show:
a) Flow meter positioning
The ow meter should preferably be installed in a horizontal position, with the axis of the turbine vertical , observing the ow direction as indicated
by the arrow on the body. The position of the ow meter, where possible, should result in a zero ow rate when there is no service.
b) Probe positioning
The temperature probes (by means of the pocket or sleeve according to the DN) must be positioned on the corresponding ow/return pipes. The
corresponding pipes are the pipes carrying the same ow rate when the ow has started.
3

The broken red line indicates the pressure drop at the permanent ow rate Qp (Dp=3,5 m w.g., for threaded connections only).
Hydraulic characteristics
Flow meter + probe pockets (if threaded connection)
Maintenance work
Strainer cleaning
It is periodically necessary to clean the strainer on the ow pipe
designed to protect the volume meter.
By observing the instant ow rate and ow-return temperature
difference values (signicantly lower ow rate compared to the nominal
value and signicantly higher temperature difference), it is easy to nd
out whether the strainer is clogged and clean it.
2) User circuit diagram - 2-way zone valve regulation
G
Central heatin
g
system
System
kWh
4
1/2” 3/4” 1” 1 1/4” 1 1/2”
Kv 5,0 7,9 17,8 17,8 33,0
p (m w.g.) p (kPa)
DN 50 DN 65 DN 80 DN 100 DN 125 DN 150 DN 200
Kv 53 89 142 223 360 540 900

CONTECA®EASY ULTRA meter electrical connections
ELECTRONICS BOX REAR PART
CABLE ROUTE
TEAR-PROOF CABLE CLIP
AA
AA
1234 56789101112131415161718
1234 56789101112131415161718
24 V (ac)
1234 56789101112131415161718
1234 5 6 7 8 91011 12 13 14 15 16 17 18
RS485
1234 56789101112131415161718
Cooling units
1234 56789101112131415161718
1234 56789101112131415161718
digital input
A B
Heating units
4th pulse input
3rd pulse input
pulse input
blue wire white wire
For box or direct wall mounting, use the screws provided and insert them into the corresponding holes A
Pins Description Accessory
1 – 2 OUT 2 - Open collector pulse output for COOLING UNITS. GND=2 / duration 120 ms / Vmax 24 V (dc) - 50 mA 755882
2 – 3 OUT 1 - Open collector pulse output for HEATING units. GND=2 / duration 120 ms / Vmax 24 V (dc) - 50 mA 755881 –
755882
4NOT used
5 – 6 IN 4 - fourth pulse input (generic). GND=6 2 x 755825
6 – 7 IN 3 - third pulse input (generic). GND=6 755825
8 – 9 IN 2 - Pulse input for DCW. GND=9
9 – 10 IN 1 - Pulse input for DHW. GND=9
11 – 12 Heating/cooling ow meter pulse input (polarised, see page 6)
13 – 14 Digital input (MUST be with voltage-free contact)
15 – 16 Electric supply 24 V (ac) 50 Hz - 1W
17 – 18 Transmission BUS RS-485 / RS-485 A=18 / RS-485 B=17
5

Operating information
Accumulated energy is stored in a non-volatile memory device
(EEPROM) each time the unit of measurement is competed (1 kWh);
at the same time this increase results in updating of the display (see
“User information cycle”).
6
ELECTRONICS BOX REAR PART
CABLE ROUTE
TEAR-PROOF CABLE CLIP
AA
AA
1234 56789101112131415161718
1234 56789101112131415161718
24 V (ac)
1234 56789101112131415161718
1234 5 6 7 8 91011 12 13 14 15 16 17 18
RS485
1234 56789101112131415161718
Cooling units
1234 56789101112131415161718
1234 56789101112131415161718
digital input
A B
Heating units
4th pulse input
3rd pulse input
pulse input
blue wire white wire
• Heating/cooling ow meter
11 - 12 Flow meter pulse input.
11 (blue wire) 12 (white wire)
• Electric supply
15 - 16 Centralised 24 V (ac) electric supply line
The 24 V (ac) electric supply line must only be used for heat
meters and must not be under the user’s control.
ELECTRONICS BOX REAR PART
CABLE ROUTE
TEAR-PROOF CABLE CLIP
AA
AA
1234 56789101112131415161718
1234 56789101112131415161718
24 V (ac)
1234 56789101112131415161718
1234 5 6 7 8 91011 12 13 14 15 16 17 18
RS485
1234 56789101112131415161718
Cooling units
1234 56789101112131415161718
1234 56789101112131415161718
digital input
A B
Heating units
4th pulse input
3rd pulse input
pulse input
blue wire white wire
• Data centralisation
If centralised data transmission via BUS is used, the following
connection plan must be implemented:
17 - 18 RS-485 polarised transmission Bus
17 Tx (RS-485-B) 18 Rx (RS-485-A)
For the transmission bus, use 2 x 1 mm2cable, preferably of the
twisted type. Note: Transmission polarisation must be fully
observed
ELECTRONICS BOX REAR PART
CABLE ROUTE
TEAR-PROOF CABLE CLIP
AA
AA
1234 56789101112131415161718
1234 56789101112131415161718
24 V (ac)
1234 56789101112131415161718
1234 5 6 7 8 91011 12 13 14 15 16 17 18
RS48
5
1234 56789101112131415161718
Cooling units
1234 56789101112131415161718
1234 56789101112131415161718
digital input
A B
Heating units
4th pulse input
3rd pulse input
pulse input
blue wire white wire
• Enery pulse outputs - codes 755881/755882
2- 3Remote heating units totaliser output (kWh) (OC type)
1- 2Remote cooling units totaliser output (kWh) (OC type)
These outputs can be connected to our product code 755890
(remote energy totaliser) or a general supervisor.
Output specications:
1 IMP = 1 kWh - open collector contact
Pulse duration: 120 ms
24 V (dc) - 50 mA
Maximum frequency = 1 Hz
ELECTRONICS BOX REAR PART
CABLE ROUTE
TEAR-PROOF CABLE CLIP
AA
AA
1234 56789101112131415161718
1234 56789101112131415161718
24 V (ac)
1234 56789101112131415161718
1234 5 6 7 8 91011 12 13 14 15 16 17 18
RS485
1234 56789101112131415161718
Cooling unit
s
1234 56789101112131415161718
1234 56789101112131415161718
digital input
A B
Heating units
4th pulse input
3rd pulse input
pulse input
blue wire white wire
• Additional pulse inputs 755825
E.g.: Heating water - Electrical energy - Gas
NOTE: The additional inputs are only enabled with codes 755825.
Connection must be with a voltage-free contact and the weight and unit
of measurement for the pulse must be indicated at the time of ordering.
E.g.: 1 pulse = 10 litres of heating water
1 pulse = 0,1 kWh electrical energy
1 pulse = 1 Nm3gas
6- 73rd pulse consumption
5- 64th pulse consumption
Minimum pulse duration: 120 ms
Maximum frequency = 1 Hz
ELECTRONICS BOX REAR PART
CABLE ROUTE
TEAR-PROOF CABLE CLIP
AA
AA
1234 56789101112131415161718
1234 56789101112131415161718
24 V (ac)
1234 56789101112131415161718
1234 5 6 7 8 91011 12 13 14 15 16 17 18
RS485
1234 56789101112131415161718
Cooling units
1234 56789101112131415161718
1234 56789101112131415161718
digital input
A B
Heating units
4th
pulse inpu
t
3rd pulse input
pulse input
blue wire white wire
• Digital input
The digital input must be with a voltage-free contact (class IB)
13 - 14 Connection to the auxiliary microswitch for the zone valve.
Note - Each 7504 series appliance comes with a tamper-proof lead
sealing kit for the temperature probes and the plastic electronics
box.
ELECTRONICS BOX REAR PART
CABLE ROUTE
TEAR-PROOF CABLE CLIP
AA
AA
1234 56789101112131415161718
1234 56789101112131415161718
24 V (ac)
1234 56789101112131415161718
1234 5 6 7 8 91011 12 13 14 15 16 17 18
RS485
1234 56789101112131415161718
Cooling units
1234 56789101112131415161718
1234 56789101112131415161718
digital inpu
t
A B
Heating units
4th pulse input
3rd pulse input
pulse input
blue wire white wire

User information cycle
The heat meter is equipped with an LCD display. The display is activated by pressing the key on the front.
By repeatedly pressing the key briey, it is possible to scroll through the various information windows. Press and hold the key corresponding to some
of the screens to access additional information.
0
0
0
Heating energy
Cooling energy
1
st
DHW pulse consumption
DHW overall consumption with optional
code 755826
2
nd
DCW pulse consumption
3
rd
pulse consumption with optional
code 755825
Flow rate
Power
Flow temperature
Return temperature
Temperature difference
DHW flow rate with optional
code 755826
Today’s date
Current time
BUS network address (IDB)
Serial number/secondary address
Transmission Baudrate
Water meter position
Weight of the pulse, flow meter
Check sum
Segment test
Meter product code
Configuration string
4
th
pulse consumption with 2 x optional
code 755825
Monthly log - dates
Daily log - dates
Log data
Log data
Enabled with
optional code
0
Check secondary sum
Change IDB
7

Test Instructions
The 7507 series meter is equipped with a fast output test
device located inside the plastic container.
In order to access this, remove the seal and take out the
xing screws.
On the right-hand side of the back of the card (g. 1) there is
a key offering access to the technical manual.
An input pulse can be simulated by connecting pins 11 - 12 (g. 3).
The maximum input pulse frequency is 1 Hz.
After pressing the key on the back of the card, pressing
the key on the front allows you to scroll through the various
screens.
The energy increases according to the following equation:
DE= κ⋅DT⋅DV⋅0,2777698⋅10-3 [Wh]
The probes, which absolutely cannot be separated from the electronics circuit,
may be inserted in a thermostatic bath, observing the temperature range of
10–90 °C and taking account of a DT between 3–80 K
(g. 1)
(g. 2)
(g. 3)
ELECTRONICS BOX REAR PART
CABLE ROUTE
TEAR-PROOF CABLE CLIP
AA
AA
1234 56789101112131415161718
1234 56789101112131415161718
24 V (ac)
1234 56789101112131415161718
1234 5 6 7 8 91011 12 13 14 15 16 17 18
RS485
1234 56789101112131415161718
Cooling units
1234 56789101112131415161718
1234 56789101112131415161718
digital input
A B
Heating units
4th pulse input
3rd pulse input
pulse input
blue wire white wire
Wh
8
κ= thermal coefcient [kJ/m3K]
DT= temperature change [K]
DV= volume change [ l ]
DV = N⋅P
where N = number of pulses
P = single pulse value per litre
Operating specications
1) In order to protect against spurious measurements or undesired metering, the metering control software makes the processing of consumption
subordinate to a specic ow temperature value (FT).
The heating metering cycle is activated for FT > 22 °C (factory setting).
The cooling units cycle is activated for FT < 15 °C (factory setting, with optional accessory code 755810).
On request, the setpoint values can be changed by technical personnel.
2) The software governing metering moreover has consumption processing subordinate to a
minimum temperature difference in order to provide further protection against spurious measurements or minimum metering due to
temperature tolerances. At the time of factory setting, a dead band of 0,4 K (factory setting) is therefore dened.
3) The software governing metering also requires installation of the ow rate meter on the return pipe.
On request and further to the action of technical personnel, the conguration setpoint can be adapted in order to install the meter on the ow
pipe.

Lead sealing procedure
Meter with threaded connections
9
A) Insert the steel thread into the dedicated hole on the volume meter caps and twist it.
B) Wind the thread as illustrated in the gure so that, once lead sealing is complete, the cap cannot be unscrewed without breaking the seal or
the thread.
C) Twist the thread and insert the plumb bob.
D) Pass the thread through the hole on the probe and the pocket and twist it;
E) Wind the thread as illustrated in the gure so that, once lead sealing is complete, the cap cannot be unscrewed without breaking the seal or
the thread;
F) Twist the thread and insert the plumb bob;
G) Repeat steps D, E, F for the other temperature probe.
H) Pass the thread through one of the
dedicated holes on the sides of the heat
meter calculation unit, twist it, then nally
insert the plumb bob.
I) Apply a cast to the plumb bobs, as
shown in green in the gure on the right.

10
Lead sealing procedure
Meter with anged connections
A) Insert the steel thread into the hole as illustrated in the gure and wind it around the pipe;
B) Wind the thread as illustrated in the gure so that, once lead sealing is complete, the ow meter cannot be removed without breaking the seal
or the thread.
C) Twist the thread and insert the plumb bob.
D) Pass the thread through the hole on the probe and the pocket and twist it;
E) Wind the thread as illustrated in the gure so that, once lead sealing is complete, the cap cannot be unscrewed without breaking the seal or
the thread;
F) Twist the thread and insert the plumb bob;
G) Repeat steps D, E, F for the other temperature probe.
H) Pass the thread through one of the
dedicated holes on the sides of the heat
meter calculation unit, twist it, then nally
insert the plumb bob.
I) Apply a cast to the plumb bobs, as
shown in green in the gure on the right.

DATA CENTRALISATION
(B) Datalogger DATA EASY TELE
(C) DATA EASY datalogger
750350
24 V (ac/dc)
750450
24 V (ac/dc)
755010
Bus cable
CONTECA®TOUCH datalogger
230 V (ac)
230 V (ac)
24 V (ac)
2-way 1 mm bus transmission line2(755855 LSC)
Centralised 24 V (ac) electric supply line
RS485
EASY
CONTECA
EASY
RS485
EASY
CONTECA
EASY
RS485
EASY
CONTECA
EASY
RS485
EASY
CONTECA
EASY
RS485
EASY
CONTECA
EASY
RS485
EASY
CONTECA
EASY
Architecture of centralisation
Local acquisition
Remote acquisition
Remote acquisition
Controller
code 755010
1
st
line
2
nd
line
3
rd
line
4
th
line
7504..
L2
L1
LA
LB
LN
LA + LB + ... + LN + L1 + L2 < 1.200 m
Hydronic Solutions
CALEFFI
Code755010- Serial
RS485
EASY
CONTECA
EASY
RS485
EASY
CONTECA
EASY
RS485
EASY
CONTECA
EASY
RS485
EASY
CONTECA
EASY
RS485
EASY
CONTECA
EASY
RS485
EASY
CONTECA
EASY
RS485
EASY
CONTECA
EASY
RS485
EASY
CONTECA
EASY
RS485
EASY
CONTECA
EASY
11
M-Bus
M-Bus
Master
M-Bus
Master
230 V (ac)
24 V (ac)
230 V (ac)
CONTECA®
environment
Master
RS485 network
755058
M-Bus - RS-485 slave converter
Used to adapt and galvanically separate two transmission standards
(M-Bus and RS-485). It allows direct connection of CONTECA®EASY
meters to an M-Bus transmission line, making them visible as slave
devices.
Electric supply: 230V (ac) - 9VA
Operating temperature: -10 – 60 °C.
755058
M-Bus/RS-485 slave converter
Code
Application diagram for M-Bus slave converter - RS-485 code 755058
The software protocol used for supervisor/CONTECA®environment
interfacing utilises the M-Bus standard (complies with EN 1434 part 3).
N.B.:
The transmission bus, code 755855 LSC, is two-way (cross-section 2
x 1 mm2). The controller allows max. 250 users.
The maximum length of each individual section is 1200 m.
It is possible to lay up to 4 separate sections using the MULTIPLEXER,
code 755005.

755010 CONTECA®TOUCH controller
The function of the controller is to acquire, via bus, all the totalised
values of the individual users (heating/ cooling units / mass / zone valve
opening hours), user operating status (ON/OFF), totalised values from
the additional pulse meters (domestic cold/hot water) and operational
diagnostics.
All the abovementioned totalised values are recorded on a daily basis
in log les that are useful for consumption analysis and the division of
expenses.
Maximum number of users: 250.
Includes:
- 1 touch-screen CPU
- 1 wall mounting rack
The controller has the following
features:
- 1 touch-screen LCD monitor for
reading consumption and user
data
- 1 RS-485 port
- 2 USB ports
- 1 LAN port
- GSM modem + M2M SIM
managed by Calef S.p.A.
- acquisition software
- instruction manual
Electric supply: 230 V (ac) ±10 % - 50 Hz - 60 W.
Ambient conditions: 10–35 °C with no dust.
DATA CENTRALISATION
750450 DATA EASY datalogger
The device is used to acquire and log the data originating from
CONTECA®EASY meters via communication bus. The integrated
web interface can be used to read consumption values and instant
data, generate reports and, if applicable, consult the reading log.
The main settings can be carried out locally via the web interface,
by connecting a PC to one of the two Ethernet ports with switch
functionality.
The SMART function allows the user to automatically recognise devices
connected to the network. Data can be acquired and consumption
reports created automatically, complete with the unit of measurement
and a description, with other activities carried out by the user removed.
Maximum number of users: 250.
Datalogger specications:
- Electric supply: 24 V (dc) ±10 %,
24 V (ac) - 3 W.
- 2 Ethernet outputs: ETH1 (PoE), ETH2.
- Working temperature range: 0–50 °C.
- Mounting: 35 mm DIN rail
(EN 60715).
- Data log storage: 10 years.
- Reports: XLS or CSV format.
750350 DATA EASY TELE datalogger
The device is used to acquire and log the data originating from
CONTECA®EASY meters via communication bus. The integrated
web interface can be used to read consumption values and
instant data, generate reports and, if applicable, consult the
reading log. When associated with a UMTS router, it allows
remote management of the CONTECA®EASY network.
The router for the DATA EASY datalogger has an Access point
function for LAN management. If it has an M2M*data SIM (not
supplied by us) and is connected to the DATA EASY system, it offers
dynamic IP management via Dyn DNS. It allows the system to be
used to its full potential, by using a browser to remotely manage the
entire network of CONTECA®EASY heat meters.
Maximum number of users: 250.
*We recommend activating the M2M SIM with FLAT control with
a minimum trafc threshold of 500 MB/month, with bandwidth
suppression/limitation when the threshold is exceeded.
Datalogger specications:
- Electric supply: 24 V (dc) ±10 %, 24 V (ac) - 3 W.
- 2 Ethernet outputs: ETH1 (PoE), ETH2.
- Working temperature range: 0-50 °C.
- Mounting: 35 mm DIN rail (EN 60715).
- Data log storage: 10 years.
- Reports: XLS or CSV format.
- Transmission method: FTP (Client), Webserver.
UMTS router:
- Electric supply: 100-240 V (ac) / 9 V (dc) - 7 W.
- LAN: Wireless AP, 4-port switch router with rewall.
- Dimensions: (H x W x D) 36 x 85 x 100 mm (mounting on horizontal
plane).
- Certication: CE, EN 60950-1.
12
N.B.: User data MUST be submitted to Calef before
commissioning can take place.

ELECTRICAL - ELECTRONIC OPTIONS
755825 Generic pulse input acquisition
The CONTECA®EASY module can acquire up to two additional
pulse inputs (for one additional pulse a product code 755825 must
be ordered; for two additional pulses 2 x product code 755825 are
required), in addition to those already dedicated to DHW and DCW.
Sometimes, and normally when there is a controller code 755010 ,
it is interesting to use the bus to transfer the user data in terms of
consumption (gas meter / electricity meter).
The generic pulse must have no potential (voltage-free contact,
maximum frequency 1 Hz). Class IB. Residences and hotels are
particularly suitable types of consumers.
755810 Cooling units metering
Upon activation of the software module, CONTECA®EASY is able to
meter the heating and cooling units, on the evaluation of the
temperature difference reversal, in separate registers for both
the current values and for the logged les.
75588. Pulse output
The pulse output enables transferral of the heating and/or cooling
energy values to a generic logger. The pulse weighs 1 kWh.
The pulse output with no potential is open collector with pulse time
120 ms - Vmax 24 V (dc) - 50 mA.
755890 Remote energy totaliser
Electronic 8-digit LCD totaliser equipped with cover plate for three-
slot recessed electric box.
Lithium battery: life 8 years - max frequency 20 Hz
Suitable for pulse outputs code 75588.
Shielded cable length (2x1 mm2): max 75 m.
755881
755882
Single pulse output - HEATING UNITS
Double pulse output - HEATING/COOLING UNITS
Code
RS485
EASY
CONTECA
EASY
RS485
EASY
CONTECA
EASY
7507 ..
755882755881
Acquisition board
Terminals 2 - 3 Heating units
7507 ..
Terminals 2 - 3 Heating units
Terminals 1 - 2 Cooling units
CALEFFI
ENERGY kWh
2
6
0V HEATING UNITS output
COOLING UNITS output
GND
1234
56789101112131415161718
Option code 755826 is supplied with an AUTOFLOW®with a
1/2” connection and a nominal ow rate of 40 l/h, code 127141
M04
755826
Flow rate - DHW recirculation scan
In compliance with standard 9182 for DHW systems with recirculation
on the risers, recirculation pipes may also need to be laid inside the user
systems. DHW consumption meters are therefore vulnerable to incorrect
circulation, which leads to errors in total consumption readings (actual
user information). The scan option can be used to distinguish between
actual and incorrect (or gross) ow rates, providing an exact DHW
consumption value for the division of expenses. The option must be
linked to the CONTECA® EASY heat meter supply; its on-site application
and setup must be carried out by Calef technicians or staff from an
authorised service centre.
The option requires setting of a recirculation ow rate (threshold), if
drawing does not take place. Every time the detected ow rate is lower
than the set threshold, only the GROSS register is increased, while -
when the ow rate is above the threshold - both registers (GROSS
and NET) are increased.
The following appear on the display:
- NET consumption
- GROSS consumption
- DHW ow rate
1
m3
1
m3
G
m3/h
To maintain a constant recirculation ow rate, a ow rate limiter with a
setting value under 100 l/h must be tted to the return branch of the
apartment recirculation network. Furthermore, a specic ow meter
must be used, with a pulse weight of 1 litre (see code 794204/C1 and
code 794205/C1).
Application diagram, code 755826
13

ELECTRONICS BOX REAR PART
CABLE ROUTE
TEAR-PROOF CABLE CLIP
AA
AA
1234 56789101112131415161718
1234 56789101112131415161718
24 V (ac)
1234 56789101112131415161718
1234 5 6 7 8 91011 12 13 14 15 16 17 18
RS485
1234 56789101112131415161718
Cooling units
1234 56789101112131415161718
1234 56789101112131415161718
digital input
A B
Heating units
4th pulse input
3rd pulse input
pulse input
blue wire white wire
14
Building transmission diagram
24 V electric supply
720030
7504..
720090
GND
Heating units
Cooling units
ELECTRONICS BOX REAR PART
CABLE ROUTE
TEAR-PROOF CABLE CLIP
AA
AA
1234 56789101112131415161718
1234 56789101112131415161718
24 V (ac)
1234 56789101112131415161718
1234 5 6 7 8 91011 12 13 14 15 16 17 18
RS485
1234 56789101112131415161718
Cooling units
1234 56789101112131415161718
1234 56789101112131415161718
digital input
A B
Heating units
4th pulse input
3rd pulse input
pulse input
blue wire white wire
755881 720030 755882 720030
Electrical connection between CONTECA®EASY and PULSE MONITOR code 720030
RS485
EASY
CONTECA
EASY
720030 PULSE MONITOR
Pulse logger.
Electric supply: lithium battery.
6-digit display with user key.
Daily data saving.
Tamper-proof seal and sensor.
Enables acquisition of a pulse output from the heat meter.
Two-way wireless transmission.
868.0–868.6 MHz, 10 mW.
Protection class: IP 31.
7557 + 75588 series.
code 720030
USB/Radio device + SW7200 software
720090
USB/Radio transmission device +
SW7200 software for reading and viewing consumption data.
Two-way wireless transmission
868.0–868.6 MHz, 10 mW.
Software developed for Microsoft®Windows operating system.
720090
Code
DATA CENTRALISATION WITH PULSE MONITOR
GND

SPECIFICATION SUMMARY
7507 series
CONTECA®EASY ULTRA direct heat meter, compliant with directive 2014/32/EU (MID), for use in heating and air-
conditioning systems, with the following specications: ultrasonic volume meter for hot water (maximum temperature 90 °C) with
pulse output, NTC type temperature probe, data viewing on 8-digit display, working temperature range 10–90 °C, protection class
IP 54, transmission via TWO-WAY Bus in accordance with M-Bus protocol over RS-485 or MODBUS RTU over RS-485, electric
supply 24 V (ac) 50 Hz - 1 W. Options: up to 2 additional pulse inputs - up to 2 pulse outputs.
Code 755810
Metering of refrigeration units. Upon activation of the software module, CONTECA®EASY is able to meter heating and cooling
units, on the evaluation of the temperature difference reversal, in separate registers for both the current values and for the
logged les.
Code 755881 – 755882
The single pulse output code 755881 or the double pulse output code 755882, allow transferral of heating and cooling energy
values to a generic logger. The pulse weighs 1 kWh. The pulse output with no potential is open collector with pulse time
120 ms - Vmax 24 V (dc) - 50 mA.
Code 755825
The optional pulse inputs (up to two) allow acquisition of generic meter consumption values (e.g. gas or electricity). The generic
pulse input should be class IB, with no potential, maximum frequency 1 Hz.
Code 755826
Option for enabling DHW metering via checking of the ow rate scan for domestic water systems equipped with a recirculation
system. The option distinguishes the actual DHW ow rates from inaccurate or gross recirculation values, with the aim of providing
the exact domestic hot water consumption gure.
Code 755890
Electronic 8-digit LCD totaliser equipped with cover plate for three-slot recessed electric box. Lithium battery: life 8 years
- max. frequency 20 Hz. Suitable for pulse outputs code 75588.. Maximum cable length (2x1 mm2) (not supplied): max. 75 m.
Cable in dedicated raceway.
Code 755010
Compact touch-screen CONTECA®TOUCH controller, equipped with RS-232 - RS-485, USB and LAN port, with user
supervisor function (max. 250) and daily logging of consumption data. Enabled for the management of alarm and remote
activation SMS messages and for the automatic daily transmission of data to FTP server via email. Electric supply 230 V (ac).
Working temperature range 10–35 °C with no dust.
Code 750350
Regulator for acquiring and logging data with the following specications: communication over RS-485 physical level in
M-Bus protocol. Electric supply: 24 V (dc) - 3 W or 24 V (ac) - 3 W. Local access via PC and remotely via integrated web
page. Daily data storage: 10 years. Mounting on 35 mm DIN rail (EN 60715). 2 Ethernet ports. Reports in .XLS or .CSV
format. Maximum number of users: 250 . Ambient temperature range 0–50 °C. UMTS router with the following specications:
electric supply: 100/240 V (ac) / 9 V (dc) - 7 W, LAN: wireless AP, router switch with 4 ports with rewall. Dynamic IP
management via Dyn DNS. Dimensions (H x W x D): 36 x 85 x 100 mm. Certication: CE, EN 60950 - 1.
Code 750450
Regulator for acquiring and logging data with the following specications: communication over RS-485 physical level in M-Bus
protocol. Electric supply: 24 V (dc) - 3 W or 24 V (ac) - 3 W. Integrated web interface. Daily data storage: 10 years. Mounting
on 35 mm DIN rail (EN 60715). 2 Ethernet ports. Reports in .XLS or .CSV format. Maximum number of users: 250 . Ambient
temperature range 0–50 °C.

We reserve the right to make changes and improvements to the products and related data in this publication, at any time and without prior notice.
Calef S.p.A.
S.R. 229, no. 25 · 28010 Fontaneto d’Agogna (NO) - Italy -
Tel. [phone] · Fax [phone]
info@calef.com · www.calef.com
© Copyright 2019 Calef
CERTIFICATION OF EVALUATION PROCEDURE FOR CONFORMITY TO
DIRECTIVE 2014/32/EU (MID DIRECTIVE)
CONTECA
®EASY ULTRA
7507 series
CONTECA
®
EASY ULTRA heat meters in the 7507
series conform to the requirements of directive
2014/32/EU, better known as MID (acronym for
Measuring Instrument Directive).
Production process certificate of conformity
(according to form D - MID directive)
Type test certification
(according to form B - MID directive)
Declaration of conformity
The manufacturer, Calef S.p.A., declares that equipment in the CONTECA EASY series 7502-7504-7507 complies with Directive 2014/32/EU. The
full text of the EU declaration of conformity is available at the following internet address: http://bit.ly/Conteca_EASY