Giacomini GE556-6 Series User manual

1
0878EN 07/2021
Metering systeMs
Heat interface unit witH electronic regulation and
double Heat excHanger ge556Y411-ge556Y412
ge556-6 series
047U57768
Main features
• Connections 3/4“.
• Electronic thermoregulation with Set-point, to manage the DHW
temperature and heating temperature.
• Remote control with chronothermostat function to manage the parameter
(for single zone), with display.
• Multizone additional control by the free contact on the electronic board
(additional thermostats to be ordered separately).
• External temperature probe for climatic compensation.
• Double heat exchangers in parallel conguration: heating and DHW
production, with priority for DHW production.
• Flow switch for priority of DHW production.
• Expansion vessel, safety valve and high eciency circulator (15/7), comply
with ErP Directive (2009/125/EC).
• Motorized three-way priority valve on the delivery of the primary side.
• Motorized two-way modulating valve on the return of the primary side.
• Filter and manual air vent valve on the primary side.
• Safety pressure switch for low pressure on the primary side.
• Heat exchanger and fully insulated piping.
• Painted sheet metal cabinet (RAL9010), with key locking.
Technical data
• Max. working temperature: 90 °C
• Max. working pressure: primary circuit: 10 bar
DHW secondary circuit: 10 bar
heating secondary circuit: 4,5 bar
Warning.
Max. working dierential pressure for the primary side = 4 bar
(priority valve)
• Temperature range of the secondary heating circuit:
low temperature 25÷45 °C
high temperature 25÷85 °C
• Temperature range of the secondary DHW circuit: 30÷60 °C (Set-Point 50 °C)
• Nominal ow rate on primary circuit: 850l/h @ 80 °C for 56 kW
1030 l/h @ 80 °C for 67 kW
Warning.
The satellite can be used in closed boiler rooms for operation with
non-aggressive uids (water, glycol-based water in compliance with
VDI 2035/ÖNORM 5195).
Description
The GE556Y411 and GE556Y412 heat interface units (HIU) allow the
metering of heat energy consumption for heating and the production of
DHW (Domestic Hot Water) in modern autonomous systems with centralised
heat production (e.g. district heating).
The conguration with two heat exchangers in parallel provides the
following advantages:
• parallel and non-intermittent handling of the domestic hot water and
heating functions;
• higher safety, the heating circuit is a sealed pressurised system should
there be any leaks within property only a small amount of water will be
discharged.
The management of the HIUs parameters is completely electronic. This
allows signicant energy savings, minimizing the ow demand from the
primary side and reducing the return temperature.
The various parameters can be set via remote control which also performs
the function of programmable chronothermostat.
Versions and product codes
Remote control and external temperature probe included with HIU
Product code Type Heating side
power
DHW heat exchanger
rated power
Template
with valves
GE556Y411 Heating and
DHW production 24,5 kW 56 kW GE551Y085 GE551Y086
GE556Y412 Heating and
DHW production 24,5 kW 67 kW GE551Y085 GE551Y086
Completion codes
The following components can be installed on each HIUs:
• Thermal energy meter of the GE552 series
• Domestic water meters of the GE552-2 series
• Template with 7 shut-o valves and system connections Ø 22 mm:
code GE551Y085
• Template with 7 shut-o valves and system connections 3/4”:
code GE551Y086
Note.
Use energy meters approved in accordance with the standardized
“ow disturbance elements” and provided for by the EN 1434 for null
rectilinear section upstream and downstream of the meter, such as the
GE552Y122.
GE556Y411 / GE556Y412

2
0878EN 07/2021
Metering systeMs
Heat interface unit witH electronic regulation and
double Heat excHanger ge556Y411-ge556Y412
ge556-6 series
047U57768
Optional components
The following components can be installed on each HIUs:
• Thermal energy meter: GE552 series
The meter temperature probe must be installed in the special housing
(Components - Ref. 1).
• Domestic water meter: GE552-2 series
• Template with 7 shut-o valves and system connections Ø 22 mm:
code GE551Y085
• Template with 7 shut-o valves and system connections 3/4”:
code GE551Y086
GE551Y085  Template with 7 valves (possibilty of connections from above)
FLUID FROM ABOVE FLUID FROM BELOW
2
4 3
1
5
2
4 3
1
5
2
4 3
1
5
2
4 3
1
5
1) Metallic frame
2) Dirt separator
3) Shut-o ball valve to isolate the HIU
4) Joint that allows the connection from above and from below
5) System pipes, Ø 22 mm
GE551Y086  Template with 7 valves (connections from below)
Components
1
2
11
12
7
13
8
14
15
16
17
3
5
10
6
4
21
22
19
18
20
A B DEFGC
1
2
11
12
7
13
8
14
15
16
17
3
5
10
6
4
21
22
19
18
20
A B DEFGC
Legend
1Housing for energy meter temperature probe
PRIMARY
2Filter
3Motorized three-way priority valve for DHW
4Pressure gauge 25 bar
5Heat exchanger for the domestic hot water function
6Manual air vent valve
7Motorized two-way modulating valve
8Brass spacer for thermal energy meter
10 Flow switch
DHW
PRODUCTION
11 Brass spacer for water meters
12 Check valve
13 Minimum pressure switch
HEATING
14 Circulator
15 Pressure gauge 6 bar
16 Heat exchanger for heating function
17 Manual air vent valve
18 Expansion vessel
19 Safety valve setted at 4,5 bar
20 Cabinet with electronic regulation unit
CHECKS21 Remote control / chronothermostat with display
22 External temperature probe
A: Domestic cold water inlet
B: Domestic cold water outlet
C: Domestic hot water outlet
D: Primary inlet
E: Primary outlet
F: Heating return
G: Heating delivery

3
0878EN 07/2021
Metering systeMs
Heat interface unit witH electronic regulation and
double Heat excHanger ge556Y411-ge556Y412
ge556-6 series
047U57768
Primary (domestic hot water and heating)
Primary inlet (D) and outlet (E). The primary circuit consists of a lter, a three-
way motorized priority valve, an manual air vent valve, a heat exchanger, a
pressure gauge and a two-way motorized zone valve.
Energy Saving function: the two-way modulating valve controlled by
the electronic management of the HIU, restricts the ow demand from
the primary to the minimum necessary to obtain the preset Set-point
temperature. The priority valve diverts the ow in the heat exchanger (if there
is a request of DHW: DHW ow switch enabled) or in the heating system.
The thermal energy meter can be installed in place of the brass spacer, tting
its temperature probe in the relative housing (Components - Ref. 1).
Fig. 1a - Primary DHW circuit
E
D
ED
ED
E
D
Fig. 1b - Primary heating circuit
Operation
EDGF
CBA
F
P
E
W
Legend
Heat exchanger Manual air vent valve
WWBrass spacer for water
meter EEBrass spacer for thermal energy meter
Motorized two-way
modulating valve
Motorized three-way
priority valve
Temperature probe Circulator
Safety valve
PP
Minimum pressure switch
Expansion vessel Pressure gauge
FFFlow switch Check valve
A: Domestic cold water inlet
B: Domestic cold water outlet
C: Domestic hot water outlet
D: Primary inlet
E: Primary outlet
F: Heating return
G: Heating delivery
Heating
Delivery (G) and return (F). The heating circuit consists of a heat exchanger, an
manual air vent valve, a pressure gauge, a minimum pressure switch, a safety
valve, an expansion vessel and a high-eciency circulator (ErP 2009/125/EC).
G
F
Fig. 2
Domestic hot water (DHW)
Cold water inlet (A), cold water outlet (B) and hot water outlet (C).
The DHW circuit consists of a ow switch, a check valve on the DCW inlet and
two brass spacers for the introduction of the water meters.
BC A
Fig. 3

4
0878EN 07/2021
Metering systeMs
Heat interface unit witH electronic regulation and
double Heat excHanger ge556Y411-ge556Y412
ge556-6 series
047U57768
Settings of the remote control/chronothermostat
Operation in mode: OFF, SUMMER, WINTER, HEATING ONLY
The selection of the operating mode is done by repeatedly pressing the button .
O: “OFF”and the current time are shown on the display. Only the antifreeze function (if set) is enabled in this mode.
Any request for the DHW or heating mode operation is ignored.
Summer: the measured room temperature, the current time and the icon are displayed . The DHW, if set, and the antifreeze function are enabled in this mode.
Any request for the heating mode operation is ignored.
Winter: the display shows the measured room temperature, the time and the current day, the icons and the program set for the current day.
All DHW, heating and, if set, antifreeze functions are enabled in this mode.
Heating only: the display shows the measured room temperature, the time and the current day, the icon and the program set for the current day.
All heating and, if set, antifreeze functions are enabled in this mode.
Any request for the DHW mode operation is ignored.
Clock and temperature setting
Depending on the operating mode selected (OFF / SUMMER / WINTER / HEATING ONLY) by pressing the button , the clock and the temperature of the
boiler can be set.
The value is displayed for a time equal to the display settings time delay and is identied by its ashing icon. Press key to pass to the next value and turn
the knob to modify the value.
Clock: press key until the icon and the time value start to ash .
Turn the knob to select the desired time.
Press the knob to pass to the minutes.
The minutes start ashing: turn the knob to select the desired minutes. Press the knob to pass to the day of the week.
The days of the week start ashing: turn the knob to select the desired day.
Press the knob to conrm the value entered.
Day Set point: press key until the icon and the day set point value start to ash .
Turn the knob to select the desired value.
Night Set point: press key until the icon and the night set point value start to ash .
Turn the knob to select the desired value.
Heating Set point: press key until the icon and the heating set point value start to ash .
Turn the knob to select the desired value.
DHW Set point: press key until the icon and the DHW set point value start to ash .
Turn the knob to select the desired value.
Kd: this setting is only available if the remote control is congured as the modulator with the use of the external probe (P04 = 2 or 3).
Press key until the icon and the relative value start to ash.
Turn the knob to select the desired value.
Note.
For the other operating modes of the remote control, refer to the corresponding instruction sheet.

5
0878EN 07/2021
Metering systeMs
Heat interface unit witH electronic regulation and
double Heat excHanger ge556Y411-ge556Y412
ge556-6 series
047U57768
Preheating Function
The preheating function has the purpose of keeping the domestic water heat exchanger hot so as to shorten the initial adjustment time required to reach the
setpoint temperature, thus providing greater comfort.
The function can be enabled/disabled by setting the t12 parameter via remote control.
When enabled, during the stand-by stage in SUMMER orWINTER mode, the function continuously monitors the domestic water probe and when the corresponding
temperature falls below the DHW setpoint dierential threshold of -8°C, a domestic water cycle is forced on with power supplied at 30% until the DHW temperature
reaches the adjustment value of the function corresponding to the DHW setpoint -2°C. There is a time limit of 2 minutes for the function to reach this value.
If the DHW temperature fails to reach the setpoint threshold value after this time, the function is interrupted and inhibited for a period of 30 minutes.
Warning.
When the DHW preheating function is enabled, plan to install a compensation device (e.g., expansion vessel/water hammer damper).
Screed Heating Function
The screed heating function facilitates the installation of low-temperature oor systems.
It is supported in the WINTER and HEAT ONLY operating modes.
The function is enabled/disabled by setting the t13 parameter via remote control.
Once activated, it forces a request for operation in heating mode at a setpoint established by the t14 parameter, for a xed time interval of 72 hours.
Subsequently, a new setpoint will be forcibly set with the value dened by the t15 parameter, for a time interval corresponding to the value established by the t16
parameter, expressed in days.
Remote Control Functions
Parameter Range Description Default
conguration Settings
t00 0/1 Heat exchanger conguration 00=single, 1=double
t01 0/1 Heating range 10=Standard, 1=Reduced
t02 0/1 dr. group conguration 00=combined, 1=domestic water only
t03 0/120 Mixing valve time 12 seconds
t04 0/30 KD for OTC 30
t05 0/1 Enabling of H2O pressure switch 10=enabled, 1=disabled
t06 0/240 CH anticycle timming 30 seconds
t07 0/1 OVT type DHW 00=xed, 1=correlated to the Setpoint
t08 0/1 OVT type CH 00=xed, 1=correlated to the Setpoint
t09 0/1 Enabling safety valve 1Screed heating timing nal phase
t10 0/60 DHW rq probe conguration 00=Contact, 1=uxmeter
t11 0/1 Disabling TA remotely 0Screed heating timing nal phase
t12 0/1 Enabling preheating 00=disabled, 1=enabled
t13 0/1 Enabling screed heating 00=disabled, 1=enabled
t14 25/34 Screed heating starting temperature 72 hours 25 °C
t15 35/45 Screed heating ending temperature 45 °C
t16 4/10 Screed heating timing nal phase 4days
Note.
To enable parameter programming, please refer to the remote-control manual.

6
0878EN 07/2021
Metering systeMs
Heat interface unit witH electronic regulation and
double Heat excHanger ge556Y411-ge556Y412
ge556-6 series
047U57768
Circulator features
Constant dierential pressure Δp-c (I, II, III) [RECOMMENDED]
0
0
1
2
0
20
40
60
3
4
5
6
7
8
∆p-v (variabile)
0
10
20
30
40
50
60
70
80
0,5 1,0 1,5 2,0 3,0 4,03,52,5
0 0,5 1,0 1,5 2,0 3,0 4,03,52,5
Q [m3/h]
Q [m3/h]
P1 [W] H [m]
H [kPa]
III
II
I
∆p-v
max.
max.
III II I
0
0
1
2
0
20
40
60
3
4
5
6
7
8
∆p-c (costante)
0
10
20
30
40
50
60
70
80
0,5 1,0 1,5 2,0 3,0 4,03,52,5
0 0,5 1,0 1,5 2,0 3,0 4,03,52,5
Q [m3/h]
Q [m
3
/h]
P1 [W] H [m]
H [kPa]
III
II
I
∆p-c
max.
max.
III
II
I
0
0
2
0
20
40
60
4
6
8
10
Velocità costante (I, II, III)
0
10
20
30
40
50
60
70
80
0,5 1,0 1,5 2,0 3,0 4,03,52,5
0 0,5 1,0 1,5 2,0 3,0 4,03,52,5
Q [m3/h]
Q [m3/h]
P1 [W] H [m]
H [kPa]
III
II
I
III
II
I
Fault signals
• The fault signal LED indicates a fault.
• The pump switches o (depending on the fault) and attempts a cyclical restart.
LED Faults Causes Remedy
Lights up red
Blocking Rotor blocked
Activate manual restart or
acontact customer service
Contacting/winding Winding defective
Flashing red
Under/overvoltage Power supply too low/high on mains side
Check mains voltage and operating
conditions, and request customer
service
Excessive module temperature Module interior too warm
Short-circuit Motor current too high
Flashes red/ green
Generator operation Water is owing through the pump hydraulics,
but there is no mains voltage at the pump
Check the mains voltage,
water quantity/pressure
and the ambient conditions
Dry run Air in the pump
Overload
Sluggish motor, pump is operated outside of its specications
(e.g. high module temperature).
The speed is lower than during normal operation
Setting the control mode
The LED selection of control modes and
corresponding pump curves takes place in
clockwise succession.
• Press the operating button briey (approx.
1 second).
LEDs display the set control mode and
pump curve.
Air venting
• Fill and vent the system correctly.
If the pump does not vent automatically:
• Activate the pump venting function via the
operating button: press and hold for 3 seconds,
then release.
The pump venting function is initiated and
lasts 10 minutes.
The top and bottom LED rows ash in turn at
1 second intervals.
• To cancel, press and hold the operating button
for 3 seconds.
After venting, the LED display shows the
previously set values of the pump.

7
0878EN 07/2021
Metering systeMs
Heat interface unit witH electronic regulation and
double Heat excHanger ge556Y411-ge556Y412
ge556-6 series
047U57768
Electrical connection
Electrical cabinet
On the back of the HIU there is an IP55 electric box containing the electronic
control board.
To access the electric cabinet unscrew the two screws (Ref. A) to release the
metal bracket (Ref. B) on which the electric cabinet is housed.
Then pull out the metal bracket by pulling it up.
A
A
B
C
Electronic board
• The HIU is powered electrically by connecting the 230 V mains supply to the
three-pin terminal board M1 of the electronic board.
•The remote control /chronothermostat (K480Y002) is connected to terminals
23-24 of the electronic board.
• The external temperature probe (K365PY002) is connected to terminals 27-
28 of the electronic board.
• The optional safety thermostat (K373/K373I), is connected to terminals 39-40
of the electronic board.
• Multizone additional control to terminals 21-22 on the electronic board
(additional thermostats to be ordered separately).
24 23 22 21 20 1932 31 30 29 28 27 26 2540 39 38 37 36 35 34 3342 41
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
L N
M1
18 17 16
SAFETY
THERMOSTAT
K373 / K373I
REMOTE COMMAND /
CHRONOTHERMOSTAT
K480Y002
ADDITIONAL
CONTROL FOR
MULTIZONE
EXTERNAL
TEMPERATURE
PROBE K365P
230 VAC
Electric technical data
• Electronic board power supply of the satellite: 230 V
• Supply voltage frequency: 50÷60 Hz
• Ambient operating temperature: -20÷60 °C
• Ambient storage temperature: -20÷80 °C
• Humidity: max 90 % @ 40° C non-condensing
• Maximum absorption: 7 VA
• Maximum length of external probe cable: 30 m
• Maximum length of remote control cable: 30 m
M-Bus
To connect the M-Bus data transfer cable to the concentrator, refer to the
datasheet of the thermal energy meter used.
Protection and safety systems
Warning.
Risk of burns and electric shock. The HIU must only be accessed by
skilled personnel, authorised by the building administrator.
It is important that the HIUs are accessed only by skilled personnel authorised
by the building administrator: the box is locked. As optional is possible to
install a K373/K373I safaty thermostat to prevent the high temperature on
the heating side.
Checks and Maintenance
Warning.
Installation must be carried out by skilled personnel, authorised by
the building administrator.
Respect the regulations regarding the use (installation, xing, etc.),
operation, recalibration and replacement of the meters. Refer also to
the assembly instructions provided with the meter.
Warning. Before connecting the template to the HIU, remove the lock
nuts from the threaded connections.
Heating circuit pressure
Regularly check the pressure in the heating circuit by means of the pressure
gauge: the pressure value must be kept above 1 bar (values lower than this
may cause cavitation, damaging the circulator). There is a pressure switch
with a 0,8 bar setting to protect the circulator.
Warning.
The HIU will turn o and the display on the remote control signals an
error E71 if the pressure is less than 0,8 bar.
Fill the system again to restart the satellite.
You must set up a lling system for heating - i.e. a connection from the
domestic water circuit to the heating circuit, with a suitable backow
preventer. Attention: risk of burns.

8
0878EN 07/2021
Metering systeMs
Heat interface unit witH electronic regulation and
double Heat excHanger ge556Y411-ge556Y412
ge556-6 series
047U57768
Operating data for GE556Y411
Primary circuit
Primary circuit for DHW production, modulating valve all open (see g.1)
1,00
0,10
0,01
0,1 1,0 10,0
Q [m3/h]
Δp [bar]
Kv = 2,08
Primary circuit for heating, modulating valve all open (see g.2)
1,00
0,10
0,01
0,1 1,0 10,0
Q [m3/h]
Δp [bar]
Kv = 1,8
Heating
Low temperature heating
(t 35-30 °C) Primary circuit working conditions
Circulator
speed
Flow rate
[l/h]
Power
[kW]
Inlet T
[° C]
Flow rate
[l/h]
Outlet T
[° C]
Max. 1400 8,2
80 150 30
75 170 30
70 175 30
65 210 31
60 260 32
High temperature heating
(t 60-45 °C) Primary circuit working conditions
Circulator
speed
Flow rate
[l/h]
Power
[kW]
Inlet T
[° C]
Flow rate
[l/h]
Outlet T
[° C]
Max. 1400 24,5
80 750 48
75 800 48
70 1100 49
65 1350 49
High temperature heating
(t 70-55 °C) Primary circuit working conditions
Circulator
speed
Flow rate
[l/h]
Power
[kW]
Inlet T
[° C]
Flow rate
[l/h]
Outlet T
[° C]
Max. 1400 24,5 80 1100 58
75 1350 59
Low temperature heating
(t 45-40 °C) Primary circuit working conditions
Circulator
speed
Flow rate
[l/h]
Power
[kW]
Inlet T
[° C]
Flow rate
[l/h]
Outlet T
[° C]
Max. 1400 8,2
80 175 40
75 210 41
70 250 42
65 310 42
60 400 42
Diagram of the heating circulator - Circulator at Δp constant (see g.2)
∆p [m H
2
O]
Q [l/h]
0
0 150 300 450 600 750 900 1050 1200 1350 1500
1
2
3
4
5
6
7

9
0878EN 07/2021
Metering systeMs
Heat interface unit witH electronic regulation and
double Heat excHanger ge556Y411-ge556Y412
ge556-6 series
047U57768
DHW production
Hydraulic data for domestic water circuit (see g.3)
0,01
0,1 1,0 10,0
0,10
1,00
Δp [bar]
Q [m3/h]
Kv = 2,1
Domestic hot water
(t 10-50 °C) Primary circuit working conditions
Flow rate
[l/min]
Flow rate
[l/h]
Power
[kW]
Inlet T
[° C]
Flow rate
[l/h]
Outlet T
[° C]
12 720 33
80 470 18,5
75 540 21,5
70 610 22,0
65 700 23,0
15 900 42
80 610 20,5
75 700 23,0
70 800 24,0
65 910 25,0
17 1020 47,5 80 710 22,0
75 810 24,0
20 1200 56 80 850 23,0
75 970 25,0

10
0878EN 07/2021
Metering systeMs
Heat interface unit witH electronic regulation and
double Heat excHanger ge556Y411-ge556Y412
ge556-6 series
047U57768
Energy saving features for GE556Y411
Low return temperatures of the primary in DHW operation
65 70 75 80
15
17
19
21
23
25
27
Primary delivery T [°C]
Primary return T [°C]
12 l/min
15 l/min
17 l/min
20 l/min
Reduced ow rates requests to the primary, in heating operation
High temperature:
65 70 75 80
Primary delivery T [°C]
600
700
800
900
1000
1100
1200
1300
1400
Primary flow rates [l/h]
24,5 kW
ΔT (60-45°C)
Q=1400 l/h
24,5 kW
ΔT (70-55°C)
Q=1400 l/h
Low temperature:
8,2 kW
ΔT (30-35 °C)
Q=1400 l/h
8,2 kW
ΔT (40-45 °C)
Q=1400 l/h
6560 70 75 80
Primary delivery T [°C]
100
150
200
250
300
350
400
450
500
Primary flow rates [l/h]