Giacomini GE556-2 Series User manual

1
0704EN February 2020
Metering systeMs
Heat Interface UnIt wItH electronIc regUlatIon
ge556Y401, ge556Y402
ge556-2 serIes
047U53918
Main features
• Electronic thermoregulation with SET POINT, to manage the DHW
temperature and heating temperature.
• Remote control with chronothermostat function to manage the parameter,
with display.
• Multizone additional control by the free contact on the electronic board
(additional thermostats to be ordered separately).
• External temperature sensor for climatic compensation.
• Heat exchanger for instantaneous DHW production.
• Flow control switch for priority DHW production.
• Motorized three-way priority valve on the delivery of the primary side.
• Motorized two-way modulating valve on the return of the primary side.
• Manual air vent lter and valve on the primary side.
• Safety pressure switch for low pressure on the primary side.
• Electrical and thermal safety valve on the heating side.
• Connections 3/4".
• Self-modulating circulator 15/6, centre distance 130 mm, complying with
ErP directive (2009/125/CE).
• Heat exchanger and fully insulated piping.
• WRAS-certied components for the domestic circuit.
• Spacers for inserting the meters.
• Painted sheet metal cabinet (RAL9010), with key locking.
Technical data
• Max. working temperature: 90 °C
• Max. working pressure: 10 bar
Warning.
Maximum operating 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: 1070 l/h @ 75 °C for 58 kW
1150 l/h @ 75 °C for 67 kW
Warning.
The HIU 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 user Heat Interface Unit (HIU) GE556Y401 and GE556Y402 allows 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 management of the HIU parameters is completely electronic.
The various parameters can be set via remote control which also performs the
function of programmable chronothermostat.
The HIU allows signicant energy savings, minimizing the ow demand from
the primary side and reducing the return temperature.
Versions and product codes
Product code Type Heating side
power
DHW heat exchanger
rated power
Template
with valves
GE556Y401 Heating and DHW
production 26 kW 58 kW GE551Y074
GE556Y402 Heating and DHW
production 26 kW 67 kW GE551Y074
Completion codes
The following components can be installed on each HIU:
• Heat energy meter of the GE552 series.
• Domestic hot water meter, GE552-2 series.
• Template with 6 shut-o valves and 3/4”connections: code GE551Y074
• Optional domestic cold water unit outlet: code GE550Y001
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.
GE556Y401 / GE556Y402

2
0704EN February 2020
Metering systeMs
Heat Interface UnIt wItH electronIc regUlatIon
ge556Y401, ge556Y402
ge556-2 serIes
047U53918
Completion codes
The following components can be installed on each HIU:
• Heat energy meter of the GE552 series.
• Domestic hot water meter, GE552-2 series.
• Optional domestic cold water unit outlet: code GE550Y001
• Template with 6 shut-o valves and 3/4”connections: code GE551Y074
Components
ED
BCA
5
10
3
11
2
1
4
15
7
6
12
8
13
9
14
G
F
16
17
Legend
1Housing for energy meter temperature probe
PRIMARY
2Filter
3Motorized three-way priority valve for DHW
4Manometer
5Heat exchanger for the domestic hot water function
6Manual air vent valve
7Minimum pressure switch
8Motorized two-way modulating valve
9Plastic spacer for heat energy meter
10 Flow switch DHW
PRODUCTION
11 Brass spacer for DHW meter
12 Motorised 2-way zone valve for heating and electric safety
HEATING13 Bypass lockshield valve
14 Circulator
15 Cabinet with electronic regulation unit
CHECKS16 Remote control / chronothermostat with display
17 External temperature probe
A: Domestic cold water outlet (optional)
B: Domestic cold water inlet
C: Domestic hot water outlet
D: Primary inlet
E: Primary outlet
F: Heating return
G: Heating delivery

3
0704EN February 2020
Metering systeMs
Heat Interface UnIt wItH electronIc regUlatIon
ge556Y401, ge556Y402
ge556-2 serIes
047U53918
Operation
EDGF
CB
F
P
E
W
Legend
Heat exchanger FFFlow switch
WWBrass spacer for DHW meter Manual air vent valve
Motorized two-way
modulating valve EEPlastic spacer for energy meter
Temperature probe Motorised 3-way priority
valve
Motorised 2-way zone valve Circulator
Bypass lockshield valve
PP
Minimum pressure switch
B: Domestic cold water inlet
C: Domestic hot water outlet
D: Primary inlet
E: Primary outlet
F: Heating return
G: Heating delivery
Primary
Inlet (D) and return (E). The primary circuit is composed of a Y-lter, a
motorized three-way priority valve, a manual air vent valve, a heat exchanger,
a manometer, a minimum pressure switch and a motorized two-way
modulating 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 pre-set 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 heat energy meter can be installed in place of the plastic spacer, tting its
temperature probe in the relative housing (1).
E
D
Fig. 1
Heating
Delivery (G) and return (F). The heating circuit is composed of a motorized
two-way zone valve with thermal safety function (the valve stops the ow
in the system in the event the delivery temperature exceeds 5° C, the
temperature set on the remote control - SET POINT), an adjustable bypass
lockshield valve and a high-eciency circulator (ErP 2009/125/EC).
E
DG
F
Fig. 2
Domestic hot water
Cold water inlet (B), hot water outlet (C) and cold water outlet (A - optional).
The DHW circuit is comprised of a ow switch and a brass spacer for the
introduction of the water meter. A hot water meter can be installed Instead
of the brass spacer.
BC
A
Fig. 3

4
0704EN February 2020
Metering systeMs
Heat Interface UnIt wItH electronIc regUlatIon
ge556Y401, ge556Y402
ge556-2 serIes
047U53918
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.
NB:
For the other operating modes of the remote control, refer to the
corresponding instruction sheet.
Electric connections
Electronic board
An electrical cabinet IP55 containing the electronic control board is located
at the top right of the HIU.
• 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
Technical data
• Electronic board power supply of the HIU: 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 data
sheet of the heat 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 HIU 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
manometer: 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 HIU.
You must set up a lling system for heating - i.e. a connection from the
domestic circuit to the heating circuit, with a suitable backow preventer.
Attention: risk of burns. Use the manual air vent to remove the air in the circuit.

5
0704EN February 2020
Metering systeMs
Heat Interface UnIt wItH electronIc regUlatIon
ge556Y401, ge556Y402
ge556-2 serIes
047U53918
Operating data for GE556Y401
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, lockshield valve and modulating valve all open (see g.2)
1,00
0,10
0,010,1 1,0 10,0
Q [m3/h]
Δp [bar]
Kv = 1,9
Heating
Low temperature heating
(Δt 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. 1500 8,8
75 170 30
70 190 30
65 215 30
60 250 30
High temperature heating
(Δt 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. 1500 26,3
75 750 45
70 900 45
65 1130 45
Max. 1200 21 60 1200 45
High temperature heating
(Δt 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. 1200 21 75 900 55
70 1200 55
Low temperature heating
(Δt 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. 1500 8,8
75 215 40
70 250 40
65 300 40
60 375 40
Diagram of the heating circulator - Circulator at Δp constant (see g.2)
00 200 400 600 800 1000 1200 1400 1600
1
2
3
4
5
6
7
∆p [m H
2
O]
Q [l/h]

6
0704EN February 2020
Metering systeMs
Heat Interface UnIt wItH electronIc regUlatIon
ge556Y401, ge556Y402
ge556-2 serIes
047U53918
DHW production
Hydraulic data for hot and cold domestic water circuits (see g.3)
0,01
0,1 1,0 10,0
0,10
1,00
Δp [bar]
Q [m3/h]
Kv = 2,22
Domestic hot water
(Δt 15-50 °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
75 495 24
70 550 24
65 665 27
60 850 30
15 900 42
75 630 25
70 720 26
65 850 28
60 1050 30
17 1020 47,5
75 730 26
70 830 27
65 1000 29
60 1200 30
20 1200 56
75 875 27
70 1000 28
65 1200 30
60 1450 31
22 1320 54 75 980 28
70 1100 28
24 1440 58,8 75 1070 28
70 1200 28

7
0704EN February 2020
Metering systeMs
Heat Interface UnIt wItH electronIc regUlatIon
ge556Y401, ge556Y402
ge556-2 serIes
047U53918
Energy saving features for GE556Y401
Low return temperatures of the primary in DHW operation
60 65 70 75
Primary delivery temp. [°C]
20
22
24
26
28
30
32
Primary return temp. [°C]
12 l/min
15 l/min
17 l/min
20 l/min
22-24 l/min
Reduced ow rates requests to the primary, in heating operation
High temperature:
60 65 70 75
Primary delivery temp. [°C]
600
700
800
900
1000
1100
1200
1300
Primary flow rate [l/h]
26 kW
∆T (60-45 °C)
Q=1500 l/h
21 kW
∆T (70-55 °C)
Q=1200 l/h
Low temperature:
60 65 70 75
Primary delivery temp. [°C]
100
150
200
250
300
350
400
450
500
550
Primary flow rate [l/h]
9 kW
∆T (35-30 °C)
Q=1500 l/h
9 kW
∆T (45-40 °C)
Q=1500 l/h

8
0704EN February 2020
Metering systeMs
Heat Interface UnIt wItH electronIc regUlatIon
ge556Y401, ge556Y402
ge556-2 serIes
047U53918
Operating data for GE556Y402
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 = 2,13
Primary circuit for heating, lockshield valve and modulating valve all open (see g.2)
1,00
0,10
0,010,1 1,0 10,0
Q [m3/h]
Δp [bar]
Kv = 1,9
Heating
Low temperature heating
(Δt 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. 1500 8,8
75 170 30
70 190 30
65 215 30
60 250 30
High temperature heating
(Δt 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. 1500 26,3
75 750 45
70 900 45
65 1130 45
Max. 1200 21 60 1200 45
High temperature heating
(Δt 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. 1200 21 75 900 55
70 1200 55
Low temperature heating
(Δt 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. 1500 8,8
75 215 40
70 250 40
65 300 40
60 375 40
Diagram of the heating circulator - Circulator at Δp constant (see g.2)
00 200 400 600 800 1000 1200 1400 1600
1
2
3
4
5
6
7
∆p [m H
2
O]
Q [l/h]

9
0704EN February 2020
Metering systeMs
Heat Interface UnIt wItH electronIc regUlatIon
ge556Y401, ge556Y402
ge556-2 serIes
047U53918
DHW production
Hydraulic data for hot and cold domestic water circuits (see g.3)
0,01
0,1 1,0 10,0
0,10
1,00
Δp [bar]
Q [m3/h]
Kv = 2,32
Domestic hot water
(Δt 15-50 °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 33,5
75 510 18,5
70 580 20
65 670 22
15 900 42
75 660 20,5
70 750 22
65 880 24
17 1020 47,5
75 770 22
70 880 23,5
65 1020 25
20 1200 56 75 940 23,5
70 1050 24,2
22 1320 61,5 75 1040 24
70 1160 24,6
24 1440 67 75 1150 25
70 1280 25

10
0704EN February 2020
Metering systeMs
Heat Interface UnIt wItH electronIc regUlatIon
ge556Y401, ge556Y402
ge556-2 serIes
047U53918
Energy saving features for GE556Y402
Low return temperatures of the primary in DHW operation
Primary return temp. [°C]
Primary delivery temp. [°C]
Reduced ow rates requests to the primary, in heating operation
High temperature:
60 65 70 75
Primary delivery temp. [°C]
600
700
800
900
1000
1100
1200
1300
Primary flow rate [l/h]
26 kW
∆T (60-45 °C)
Q=1500 l/h
21 kW
∆T (70-55 °C)
Q=1200 l/h
Low temperature:
60 65 70 75
Primary delivery temp. [°C]
100
150
200
250
300
350
400
450
500
550
Primary flow rate [l/h]
9 kW
∆T (35-30 °C)
Q=1500 l/h
9 kW
∆T (45-40 °C)
Q=1500 l/h