Giacomini GE556-5 Operating instructions

1
Giacomini S.p.A.
Via per Alzo 39, 28017 San Maurizio d’Opaglio (NO) Italia
[email protected]om
[phone] - giacomini.com
HIUs GE556-5 are modular and compact heat interface units for metering of thermal energy consumptions in autonomous
heating and domestic hot water production (DHW) systems with centralized heat production (e.g. teleheating).
HIUs GE556-5 are modular as they enable to combine multiple components and create the HIU most suitable for one’s
installation needs (control of high-temperature heating with or without balancing valves, control of domestic hot and/or cold
water, etc.).
GE556-5
Compact modular
Heat Interface Unit Datasheet/Instruction
0973EN 04/2021
047U58178
EXAMPLES OF POSSIBLE LAYOUTS

2
Giacomini S.p.A.
Via per Alzo 39, 28017 San Maurizio d’Opaglio (NO) Italia
[email protected]om
[phone] - giacomini.com
Technical data
• Max. working temperature of primary and secondary circuit (heating and domestic hot water): 90 °C
• Max. working pressure of heating primary and secondary circuit: 10 bar
• Max. dierential pressure of primary circuit: 0.5 bar (if present the GE556Y530/532 kit: 2 bar)
• Max. working pressure of domestic hot water circuit (DHW): 10 bar
• Temperature range of domestic hot water secondary circuit (DHW) with kit GE556Y522: 20÷70°C (set point 50 °C)
• Temperature range of thermostatic by-pass with kit GE556Y566: 20÷70°C
• Nominal ow rate of primary circuit (domestic hot water production):
- With exchanger GE556Y511/512
515 l/h @ 80 °C for 34 kW; 12 l/min @ ΔT 40 °C (10-50 °C)
- With exchanger GE556Y513/514
620 l/h @ 80 °C for 42 kW; 15 l/min @ ΔT 40 °C (10-50 °C)
- With exchanger GE556Y515/516
720 l/h @ 80 °C for 50 kW; 18 l/min @ ΔT 40 °C (10-50 °C)
• Nominal ow rate of high-temperature heating circuit (kit GE556Y543): 480 l/h @ ΔT 10 °C (80-70 °C) for 5.5 kW
WARNING. The HIU is suitable for installation in indoor rooms and boiler rooms, and use with non-aggressive uids (water, glycol-based water complying with
VDI 2035/ÖNORM 5195).
• Hydraulic connections: adjustable tail piece (10 mm extension) with 3/4”F at seat nut
• Power of domestic water exchanger up to 50 kW
• Priority valve for domestic water production
• Water hammer arrestor for domestic water circuit (not included if the GE556Y564/565 recirculation kit is present)
• Polypropylene foam insulation shell
• Fit for installation of thermal energy and domestic water meters
Optional features
• Primary circuit top or bottom inlet
• Compact or double regulation dierential pressure control valve on primary circuit (preregulated)
• Thermostatic head to control domestic hot water temperature
• Presetting valve to control high-temperature heating circuit ow rate
• Thermostatic by-pass for constant temperature of exchanger domestic hot water
• Recirculation kit with or without circulator for domestic water circuit
• Varnished metal cover aesthetically appealing
Main features

3
Giacomini S.p.A.
Via per Alzo 39, 28017 San Maurizio d’Opaglio (NO) Italia
[email protected]om
[phone] - giacomini.com
Versions and product codes
Starting from basic codes GE556Y503/504, the HIU can be congured with additional product codes and optionals.
BASIC
DOMESTIC WATER CIRCUIT
PRIMARY CIRCUIT SECONDARY CIRCUIT
OPTIONALS
Heat
exchangers
Control
components Insulation Other optionals
GE556Y503
Primary connections
from bottom
GE556Y511
16-plate exchanger
+ 5 mm insulation
GE556Y521
DHW production
without controls
GE556Y531
Primary circuit connections
without controls
GE556Y544
Secondary circuit, direct
heating with presetting valve
and optional installation
of thermo-electric actuator
GE556Y552
Insulation
GE556Y561
Unit output for DCW outlet
GE556Y504
Primary connections from top
GE556Y512
16-plate exchanger
+ 20 mm insulation
GE556Y522
DHW production
with thermostatic control
GE556Y532
Primary circuit connections
with differential pressure
control valve
GE556Y564
Unit output for domestic
water recirculation
with circulator
GE556Y513
26-plate exchanger
+ 5 mm insulation
GE556Y530
Primary circuit connections
with compact differential
pressure control valve
GE556Y565
Unit output for domestic
water recirculation
without circulator
GE556Y514
26-plate exchanger
+ 20 mm insulation
GE556Y566
Thermostatic by-pass to
maintain exchanger DHW
temperature
GE556Y515
36-plate exchanger
+ 5 mm insulation
GE556Y569
System
drain cocks
GE556Y516
36-plate exchanger
+ 20 mm insulation
IMPORTANT NOTE.
The second to last gure of each product code (shown in red in the table)
indicates the product type:
0 for heat interface unit base
1 for domestic water circuit exchangers
2 for control components of domestic water circuit
3 for control components of primary circuit
4 for control components of secondary circuit (heating)
5 for insulations (optional)
6 for other optional components
To ensure proper operation, a minimum of one product code for each type of
component with 0, 1, 2, 3, 4 as second to last gure is mandatory.
Product codes with 5, 6 as second to last gure are optional.

4
Giacomini S.p.A.
Via per Alzo 39, 28017 San Maurizio d’Opaglio (NO) Italia
[email protected]om
[phone] - giacomini.com
Example 1
The HIU shown includes the following components:
GE556Y503: primary connections from bottom
GE556Y516: 36-plate exchanger + 20 mm insulation
GE556Y522: domestic hot water production with thermostatic control
GE556Y531: primary circuit connections without controls
GE556Y544: secondary circuit, direct heating with presetting valve and
thermo-electric actuator installed
GE551Y088: lowered template with 6 shut-o valves, for HIU GE556Y503
or GE556Y504
Example 2
The HIU shown includes the following components:
GE556Y503: primary connections from bottom
GE556Y516: 36-plate exchanger + 20 mm insulation
GE556Y522: domestic hot water production with thermostatic control
GE556Y531: primary circuit connections without controls
GE556Y544: secondary circuit, direct heating with presetting valve and
thermo-electric actuator installed
GE556Y552: insulation
GE556Y561: unit output for additional DCW outlet
GE551Y087: template with 6 shut-o valves, for HIU GE556Y503 or
GE556Y504 including insulation GE556Y552
GE500Y258: additional valve for domestic cold water to be installed on
template when optional kit GE556Y561 is included
Examples of possible layouts
NOTA.
For the realization of the purchase code of the desired conguration, refer to our sales back ofce.
- SM556Y30417: GE556Y503 + GE556Y516 + GE556Y522 + GE556Y531 + GE556Y544 (template to be ordered separately)
- SM556Y30441: GE556Y503 + GE556Y516 + GE556Y522 + GE556Y531 + GE556Y544 + GE556Y552 + GE556Y561 (template and additional valve to be ordered separately)
Completion codes
GE551Y087
Template with 6 shut-off valves,
for GE556Y503 or GE556Y504 HIU
including insulation GE556Y552
GE551Y088
Lowered template with 6 shut-off valves,
for GE556Y503 or GE556Y504 HIU
without insulation
GE500Y258
Additional DCW valve,
for installation on template with
GE556Y561 optional kit
GE551Y184
HIU locking metal cover,
for HIU GE551Y087 with template only
R473 / R473M
Thermo-electric actuator normally closed
to control presetting valve included
with kit GE556Y544
R473X221: 230 V R473X222: 24 V
R473MX221: 230 V R473MX222: 24 V
GE552
Thermal energy meter
GE552Y159: 3/4”, volumetric, 1,5 m3/h, M-Bus
GE552Y216: 3/4”, volumetric, 1,5 m3/h, M-Bus,
with Wireless M-Bus predisposition
GE552Y122 3/4”, ultrasonic, 1,5 m3/h, M-Bus
GE552-2
Domestic water meter
GE552Y190: 3/4”, domestic cold water,
to be ordered separately if GE556Y561
additional unit output is present
GE552Y191: 3/4”, domestic hot water

5
Giacomini S.p.A.
Via per Alzo 39, 28017 San Maurizio d’Opaglio (NO) Italia
[email protected]om
[phone] - giacomini.com
Components
PRIMARY CIRCUIT
1Filter
2Probe housing for thermal energy meter
3Probe housing for differential pressure control valve
4Mechanical priority valve
5Manual air vent valve
6Brass spacer for thermal energy meter
7Compact differential pressure control valve (GE556Y530 kit)
or double regulation differential pressure control valve (GE556Y532 kit)
8System drain cock, lling unit connection or pressure probe connection
(OPTIONAL)
DOMESTIC WATER PRIMARY AND SECONDARY CIRCUIT
9Thermostatic by-pass kit (OPTIONAL)
10 Thermostatic head for temperature control of domestic water circuit
11 Heat exchanger
12 Brass spacer for domestic cold water meter (DCW)
13 System drain cock, lling unit connection or pressure probe connection
(OPTIONAL)
14 Flow rate controller
15 Brass spacer for domestic hot water meter (DHW)
16a Water hammer arrestor
16b Domestic water recirculation kit with circulator (kit GE556Y564)
or without circulator (kit GE556Y565) (OPTIONALS)
17 Check valve
18 Check valve
HIGH-TEMP. HEATING
SECONDARY CIRCUIT
19 Presetting valve (kit GE556Y544)
20 System drain cock, lling unit connection or pressure probe connection
(OPTIONAL)
OTHER COMPONENTS
21 Metal template
22 Shut-off valves for HIU installation
23 Cabinet with electric connection terminals
24 Metal frame
25 Insulation (OPTIONAL)
HYDRAULIC CONNECTIONS
ADomestic cold water outlet
BDomestic cold water inlet
CDomestic hot water outlet
DPrimary inlet
EPrimary outlet
FHigh-temperature heating delivery
GHigh-temperature heating return
HDomestic hot water recirculation
1
5
9
14
10
11
24
25
18
12
16b
17
22
15
13
6
2
3
4
19
20
21
7
8
23
B
D
CA
E
FG
H
1
5
9
14
10
11
24
25
18
12
16a
22
15
13
6
2
3
4
19
20
21
7
8
23
BCAFD GE
1
5
9
14
10
11
24
25
18
12
16b
17
22
15
13
6
2
3
4
19
20
21
7
8
23
B
D
CA
E
FG
H
1
5
9
14
10
11
24
25
18
12
16a
22
15
13
6
2
3
4
19
20
21
7
8
23
BCAFD GE

6
Giacomini S.p.A.
Via per Alzo 39, 28017 San Maurizio d’Opaglio (NO) Italia
[email protected]om
[phone] - giacomini.com
Operation
Filter
Probe housing for thermal energy meter
CBrass spacer for domestic cold water meter
Heat exchanger
E
Brass spacer for thermal energy meter
Thermostatic head with temperature probe
Probe housing for differential pressure control valve
Mechanical priority valve
Check valve
HBrass spacer for domestic hot water meter
Manual air vent valve
Compact differential pressure control valve (GE556Y530 kit)
or double regulation diff. press. control valve (GE556Y532 kit)
Presetting valve (kit GE556Y544)
Water hammer arrestor
RCirculator for domestic hot water recirculation
ADomestic cold water outlet
BDomestic cold water inlet
CDomestic hot water outlet
DPrimary inlet
EPrimary outlet
FHigh-temperature heating delivery
GHigh-temperature heating return
HDomestic hot water recirculation
WARNING. When recirculation kit (GE556Y564/565) is included, install the
additional unit output for domestic cold water (GE556Y561) and reverse the
domestic cold water inlet/outlet ows (A and B).
It is also necessary to provide an expansion tank suitably sized according to the
volume of the recirculation system.
PRIMARY CIRCUIT: inlet: (D) and outlet (E). The primary circuit includes two zones: one for heating control and the other for domestic
hot water production. The primary circuit includes a lter, a housing to install the probe of the dierential pressure control valve, a
mechanical priority valve, a manual air vent valve, a brass spacer and a dierential pressure control valve.
The brass spacer (Components - Ref. 6) can be replaced with a thermal energy meter by installing its temperature probe in the
matching housing (Components - Ref. 2).
The water from the boiler room enters the HIU and is generally channeled towards the heating secondary circuit.
When there is a demand for domestic hot water, the priority valve diverts the primary uid towards the heat exchanger; a thermostatic
head controls and sets the required ow rate (when kit GE556Y522 is included).
DHW: cold water inlet (B), cold water outlet (A), hot water outlet (C). The domestic water circuit includes a mechanical priority valve,
a check valve, a water hammer arrestor, a heat exchanger, a ow rate controller and a brass spacer (two spacers when kit GE556Y561
is included). The two brass spacers (Components - Ref. 12 and 15) can be replaced with a domestic cold/hot water meter.
A thermostatic head (when kit GE556Y522 is included) (Components - Ref. 10) controls and sets the domestic hot water temperature.
HIGH-TEMPERATURE HEATING: delivery (F) and return (G). The high-temperature heating circuit includes a presetting valve with
optional installation of a thermo-electric actuator (when kit GE556Y544 is installed).
After owing through the mechanical priority valve, the primary circuit hot water is channeled directly into the high-temperature
heating system.
C H
E
HDGCEF
R
BA
C H
E
BDGCAEF
C H
E
HDGCEF
R
B A
C H
E
BDGCAEF

7
Giacomini S.p.A.
Via per Alzo 39, 28017 San Maurizio d’Opaglio (NO) Italia
[email protected]om
[phone] - giacomini.com
TECHNICAL DATA FOR MANDATORY COMPONENTS
• Perforated metal frame
• Mechanical priority valve
• Brass spacers for energy and water meters
• Stainless steel pipes
• Filter
• Manual air vent valve
• Water hammer arrestor
• GE556Y503 weight: 10,4 kg
• GE556Y504 weight: 10,4 kg
BASIC
DOMESTIC WATER CIRCUIT PRIMARY
CIRCUIT
SECONDARY
CIRCUIT
OPTIONALS
Heat exchangers Control
components Insulation Other optionals
GE556Y503
Primary
connections
from bottom
GE556Y511
16-plate exchanger
+ 5 mm insulation
GE556Y521
DHW production
without controls
GE556Y531
Primary circuit
connections
with no controls
GE556Y544
Secondary circuit,
direct heating with
presetting valve
GE556Y552
Insulation
GE556Y561
Unit output of
DCW outlet
GE556Y504
Primary
connections
from top
GE556Y512
16-plate exchanger
+ 20 mm insulation
GE556Y522
DHW production
with thermostatic
control
GE556Y532
Primary circuit
connections with
double regulation
differential pressure
control valve
GE556Y564
Unit output for
domestic water
recirculation, with
circulator
GE556Y513
26-plate exchanger
+ 5 mm insulation
GE556Y530
Primary circuit
connections with
compact differential
pressure contr. valve
GE556Y565
Unit output for
domestic water
recirculation
without circulator
GE556Y514
26-plate exchanger
+ 20 mm insulation
GE556Y566
Thermostatic
by-pass to maintain
exchanger DHW
temperature
GE556Y515
36-plate exchanger
+ 5 mm insulation
GE556Y569
System drain cocks
GE556Y516
36-plate exchanger
+ 20 mm insulation
Basic codes GE556Y503, GE556Y504
GE556Y503
Primary connections from bottom
GE556Y504
Primary connections from top
BASIC
DOMESTIC WATER CIRCUIT PRIMARY
CIRCUIT
SECONDARY
CIRCUIT
OPTIONALS
Heat exchangers Control
components Insulation Other optionals
GE556Y503
Primary
connections
from bottom
GE556Y511
16-plate exchanger
+ 5 mm insulation
GE556Y521
DHW production
without controls
GE556Y531
Primary circuit
connections
with no controls
GE556Y544
Secondary circuit,
direct heating with
presetting valve
GE556Y552
Insulation
GE556Y561
Unit output of
DCW outlet
GE556Y504
Primary
connections
from top
GE556Y512
16-plate exchanger
+ 20 mm insulation
GE556Y522
DHW production
with thermostatic
control
GE556Y532
Primary circuit
connections with
double regulation
differential pressure
control valve
GE556Y564
Unit output for
domestic water
recirculation, with
circulator
GE556Y513
26-plate exchanger
+ 5 mm insulation
GE556Y530
Primary circuit
connections with
compact differential
pressure contr. valve
GE556Y565
Unit output for
domestic water
recirculation
without circulator
GE556Y514
26-plate exchanger
+ 20 mm insulation
GE556Y566
Thermostatic
by-pass to maintain
exchanger DHW
temperature
GE556Y515
36-plate exchanger
+ 5 mm insulation
GE556Y569
System drain cocks
GE556Y516
36-plate exchanger
+ 20 mm insulation
Domestic water circuit: heat ex-
changers GE556Y511, GE556Y512,
GE556Y513, GE556Y514,
GE556Y515, GE556Y516
GE556Y511
16-plate exchanger
+ 5 mm insulation
GE556Y512
16-plate exchanger
+ 20 mm insulation
 Flow rate controller
for domestic hot water
production
up to 12 l/min
• Weight: 1,4 kg
GE556Y513
26-plate exchanger
+ 5 mm insulation
GE556Y514
26-plate exchanger
+ 20 mm insulation
 Flow rate controller
for domestic hot water
production
up to 15 l/min
• Weight: 1,8 kg
GE556Y515
36-plate exchanger
+ 5 mm insulation
GE556Y516
36-plate exchanger
+ 20 mm insulation
 Flow rate controller
for domestic hot water
production
up to 18 l/min
• Weight: 2,3 kg

8
Giacomini S.p.A.
Via per Alzo 39, 28017 San Maurizio d’Opaglio (NO) Italia
[email protected]om
[phone] - giacomini.com
BASIC
DOMESTIC WATER CIRCUIT PRIMARY
CIRCUIT
SECONDARY
CIRCUIT
OPTIONALS
Heat exchangers Control
components Insulation Other optionals
GE556Y503
Primary
connections
from bottom
GE556Y511
16-plate exchanger
+ 5 mm insulation
GE556Y521
DHW production
without controls
GE556Y531
Primary circuit
connections
with no controls
GE556Y544
Secondary circuit,
direct heating with
presetting valve
GE556Y552
Insulation
GE556Y561
Unit output of
DCW outlet
GE556Y504
Primary
connections
from top
GE556Y512
16-plate exchanger
+ 20 mm insulation
GE556Y522
DHW production
with thermostatic
control
GE556Y532
Primary circuit
connections with
double regulation
differential pressure
control valve
GE556Y564
Unit output for
domestic water
recirculation, with
circulator
GE556Y513
26-plate exchanger
+ 5 mm insulation
GE556Y530
Primary circuit
connections with
compact differential
pressure contr. valve
GE556Y565
Unit output for
domestic water
recirculation
without circulator
GE556Y514
26-plate exchanger
+ 20 mm insulation
GE556Y566
Thermostatic
by-pass to maintain
exchanger DHW
temperature
GE556Y515
36-plate exchanger
+ 5 mm insulation
GE556Y569
System drain cocks
GE556Y516
36-plate exchanger
+ 20 mm insulation
Domestic water circuit: control
components GE556Y521, GE556Y522
GE556Y522
DHW production
with thermostatic control
GE556Y521
DHW production
without controls
• Weight: 0,3 kg • Temperature range of
domestic hot water circuit:
20÷70°C (set point 50 °C)
• Weight: 1,3 kg
NOTE. Kit GE556Y521 cannot be combined to thermostatic by-pass kit
GE556Y566.
BASIC
DOMESTIC WATER CIRCUIT PRIMARY
CIRCUIT
SECONDARY
CIRCUIT
OPTIONALS
Heat exchangers Control
components Insulation Other optionals
GE556Y503
Primary
connections
from bottom
GE556Y511
16-plate exchanger
+ 5 mm insulation
GE556Y521
DHW production
without controls
GE556Y531
Primary circuit
connections
with no controls
GE556Y544
Secondary circuit,
direct heating with
presetting valve
GE556Y552
Insulation
GE556Y561
Unit output of
DCW outlet
GE556Y504
Primary
connections
from top
GE556Y512
16-plate exchanger
+ 20 mm insulation
GE556Y522
DHW production
with thermostatic
control
GE556Y532
Primary circuit
connections with
double regulation
differential pressure
control valve
GE556Y564
Unit output for
domestic water
recirculation, with
circulator
GE556Y513
26-plate exchanger
+ 5 mm insulation
GE556Y530
Primary circuit
connections with
compact differential
pressure contr. valve
GE556Y565
Unit output for
domestic water
recirculation
without circulator
GE556Y514
26-plate exchanger
+ 20 mm insulation
GE556Y566
Thermostatic
by-pass to maintain
exchanger DHW
temperature
GE556Y515
36-plate exchanger
+ 5 mm insulation
GE556Y569
System drain cocks
GE556Y516
36-plate exchanger
+ 20 mm insulation
GE556Y531
Primary circuit
connections
with no controls
• Weight: 0,3 kg
Use in systems
with uncontrolled
differential pressure
< 0,5 bar
For the correct
operation of the
HIU, the differential
pressure control valve
can’t be set above 0,5
bar (factory setting)
GE556Y532
Primary circuit
connections with
double regulation
differential pressure
control valve
• Weight: 1,9 kg
Use in systems
that determine a
differential pressure >
0,5 bar, and where is
required a differential
pressure control <
0,5 bar
Factory
pre-adjustment value
0,5 bar
(maximum allowed)
GE556Y530
Primary circuit
connections with
compact differential
pressure control valve
• Weight: 1,4 kg
Use in systems
that determine a
differential pressure
> 0,5 bar
Primary circuit GE556Y531,
GE556Y532, GE556Y530

9
Giacomini S.p.A.
Via per Alzo 39, 28017 San Maurizio d’Opaglio (NO) Italia
[email protected]om
[phone] - giacomini.com
BASIC
DOMESTIC WATER CIRCUIT PRIMARY
CIRCUIT
SECONDARY
CIRCUIT
OPTIONALS
Heat exchangers Control
components Insulation Other optionals
GE556Y503
Primary
connections
from bottom
GE556Y511
16-plate exchanger
+ 5 mm insulation
GE556Y521
DHW production
without controls
GE556Y531
Primary circuit
connections
with no controls
GE556Y544
Secondary circuit,
direct heating with
presetting valve
GE556Y552
Insulation
GE556Y561
Unit output of
DCW outlet
GE556Y504
Primary
connections
from top
GE556Y512
16-plate exchanger
+ 20 mm insulation
GE556Y522
DHW production
with thermostatic
control
GE556Y532
Primary circuit
connections with
double regulation
differential pressure
control valve
GE556Y564
Unit output for
domestic water
recirculation, with
circulator
GE556Y513
26-plate exchanger
+ 5 mm insulation
GE556Y530
Primary circuit
connections with
compact differential
pressure contr. valve
GE556Y565
Unit output for
domestic water
recirculation
without circulator
GE556Y514
26-plate exchanger
+ 20 mm insulation
GE556Y566
Thermostatic
by-pass to maintain
exchanger DHW
temperature
GE556Y515
36-plate exchanger
+ 5 mm insulation
GE556Y569
System drain cocks
GE556Y516
36-plate exchanger
+ 20 mm insulation
Secondary circuit: high-tempera-
ture heating with kit GE556Y544
• Weight: 1,2 kg
GE556Y544
Secondary circuit,
direct heating with presetting
valve and optional installation
of thermo-electric actuator

10
Giacomini S.p.A.
Via per Alzo 39, 28017 San Maurizio d’Opaglio (NO) Italia
[email protected]om
[phone] - giacomini.com
TECHNICAL DATA FOR OPTIONAL COMPONENTS
477
FRONT SHELL: INTERNALFRONT SHELL: EXTERNAL REAR SHELL + FRONT: BOTTOM VIEW
AB
CD
673
189
Dimensions in mm
BASIC
DOMESTIC WATER CIRCUIT PRIMARY
CIRCUIT
SECONDARY
CIRCUIT
OPTIONALS
Heat exchangers Control
components Insulation Other optionals
GE556Y503
Primary
connections
from bottom
GE556Y511
16-plate exchanger
+ 5 mm insulation
GE556Y521
DHW production
without controls
GE556Y531
Primary circuit
connections
with no controls
GE556Y544
Secondary circuit,
direct heating with
presetting valve
GE556Y552
Insulation
GE556Y561
Unit output of
DCW outlet
GE556Y504
Primary
connections
from top
GE556Y512
16-plate exchanger
+ 20 mm insulation
GE556Y522
DHW production
with thermostatic
control
GE556Y532
Primary circuit
connections with
double regulation
differential pressure
control valve
GE556Y564
Unit output for
domestic water
recirculation, with
circulator
GE556Y513
26-plate exchanger
+ 5 mm insulation
GE556Y530
Primary circuit
connections with
compact differential
pressure contr. valve
GE556Y565
Unit output for
domestic water
recirculation
without circulator
GE556Y514
26-plate exchanger
+ 20 mm insulation
GE556Y566
Thermostatic
by-pass to maintain
exchanger DHW
temperature
GE556Y515
36-plate exchanger
+ 5 mm insulation
GE556Y569
System drain cocks
GE556Y516
36-plate exchanger
+ 20 mm insulation
Insulation GE556Y552
GE556Y552
Insulation
Polypropylene foam insulation (EPP 40 g/l) including
factory-tted back shell and removable clip-on front shell.
Also included are two removable doors for access to
the thermal energy meter display and installation of low-
temperature kit with circulator.
• Weight: 0,9 kg
NOTE. The insulation is factory-tted and must be purchased with the HIU.
It cannot be installed at a later time.
Use template GE551Y087 when insulation is included.
ARemovable front door for installation of energy meter with splittable display
BCut-out prole for installation of energy meter with non-splittable display
CCut-out prole for installation of recirculation kit GE556Y564/GE556Y565
DCut-out prole for installation of system drain cocks GE556Y569
TECHNICAL DATA FOR OPTIONAL COMPONENTS

11
Giacomini S.p.A.
Via per Alzo 39, 28017 San Maurizio d’Opaglio (NO) Italia
[email protected]om
[phone] - giacomini.com
1
2
BASIC
DOMESTIC WATER CIRCUIT PRIMARY
CIRCUIT
SECONDARY
CIRCUIT
OPTIONALS
Heat exchangers Control
components Insulation Other optionals
GE556Y503
Primary
connections
from bottom
GE556Y511
16-plate exchanger
+ 5 mm insulation
GE556Y521
DHW production
without controls
GE556Y531
Primary circuit
connections
with no controls
GE556Y544
Secondary circuit,
direct heating with
presetting valve
GE556Y552
Insulation
GE556Y561
Unit output of
DCW outlet
GE556Y504
Primary
connections
from top
GE556Y512
16-plate exchanger
+ 20 mm insulation
GE556Y522
DHW production
with thermostatic
control
GE556Y532
Primary circuit
connections with
double regulation
differential pressure
control valve
GE556Y564
Unit output for
domestic water
recirculation, with
circulator
GE556Y513
26-plate exchanger
+ 5 mm insulation
GE556Y530
Primary circuit
connections with
compact differential
pressure contr. valve
GE556Y565
Unit output for
domestic water
recirculation
without circulator
GE556Y514
26-plate exchanger
+ 20 mm insulation
GE556Y566
Thermostatic
by-pass to maintain
exchanger DHW
temperature
GE556Y515
36-plate exchanger
+ 5 mm insulation
GE556Y569
System drain cocks
GE556Y516
36-plate exchanger
+ 20 mm insulation
Additional unit output for domestic
cold water GE556Y561
Additional unit output for domestic cold water including
removable brass spacer for installation of domestic cold
water meter (110 mm center distance).
Additional unit output GE556Y561 must be installed by
screwing the special nut on the domestic water circuit Tee
tting (Ref. 1).
We recommend installing additional valve GE500Y258 (Ref. 2)
when additional output GE556Y561 is included.
• Weight: 0,4 kg
GE556Y561
Unit output for DCW outlet
Kv of domestic cold water circuit
B
A
10000
1000
∆P [mm H2o]
Q [l/h]
100
10
10 100 100001000
Kv = 6,6

12
Giacomini S.p.A.
Via per Alzo 39, 28017 San Maurizio d’Opaglio (NO) Italia
[email protected]om
[phone] - giacomini.com
Characteristics of recirculation kit circulator GE556Y564
• Max. working temperature: 65 °C (75 °C for max. 2h)
• Max. working pressure: 10 bar
• Power supply: 230 V
• Electric absorption: 3÷4.5 W
• Protection class: IP42
• Max. water hardness: 20 °dH
0
0,2
0,4
0,6
0,8
1,0
0 0,1 0,2 0,3 0,4 0,5
Q [m3/h]
H [m]
1
2
BASIC
DOMESTIC WATER CIRCUIT PRIMARY
CIRCUIT
SECONDARY
CIRCUIT
OPTIONALS
Heat exchangers Control
components Insulation Other optionals
GE556Y503
Primary
connections
from bottom
GE556Y511
16-plate exchanger
+ 5 mm insulation
GE556Y521
DHW production
without controls
GE556Y531
Primary circuit
connections
with no controls
GE556Y544
Secondary circuit,
direct heating with
presetting valve
GE556Y552
Insulation
GE556Y561
Unit output of
DCW outlet
GE556Y504
Primary
connections
from top
GE556Y512
16-plate exchanger
+ 20 mm insulation
GE556Y522
DHW production
with thermostatic
control
GE556Y532
Primary circuit
connections with
double regulation
differential pressure
control valve
GE556Y564
Unit output for
domestic water
recirculation, with
circulator
GE556Y513
26-plate exchanger
+ 5 mm insulation
GE556Y530
Primary circuit
connections with
compact differential
pressure contr. valve
GE556Y565
Unit output for
domestic water
recirculation
without circulator
GE556Y514
26-plate exchanger
+ 20 mm insulation
GE556Y566
Thermostatic
by-pass to maintain
exchanger DHW
temperature
GE556Y515
36-plate exchanger
+ 5 mm insulation
GE556Y569
System drain cocks
GE556Y516
36-plate exchanger
+ 20 mm insulation
Unit output for domestic water
recirculation
GE556Y564 (with circulator),
GE556Y565 (without circulator)
GE556Y564
Unit output for domestic
water recirculation
including circulator
GE556Y565
Unit output for domestic
water recirculation
without circulator
The recirculation unit output maintains the temperature
of domestic hot water inside the domestic water circuit,
channeling it back into the heat exchanger for instant
availability. To install the unit output for domestic water
recirculation, follow the steps below:
- on upper section, screw the recirculation kit nut on the Tee
tting (Ref. 1) of the heat exchanger cold water delivery;
- on lower section, screw the metal bracket of the
recirculation kit (Ref. 2) on the HIU template (Note: metal
bracket not included with kit GE556Y565).
• GE556Y564 weight: 1,5 kg
• GE556Y565 weight: 0,4 kg
NOTE. Thermostatic by-pass kit GE556Y566 must be installed when
domestic water recirculation kit GE556Y564/GE552Y565 is included.
WARNING. For proper
metering when installing the
domestic hot water recirculation
kit, also install the additional
domestic cold water unit output
(GE556Y561) and reverse the
inlet/outlet ows of domestic cold
water (A and B).
Place the label with reference
over the template label,
where the domestic cold water
connections are positioned .
GE556Y561
BCAFD GE
H
NOTE. When the GE556Y564/GE552Y565 domestic water recirculation kit is
included, it is necessary to provide a safety valve or an expansion vessel on the
domestic water recirculation circuit.
NOTE. When the GE556Y564/GE552Y565 domestic water recirculation kit is
included, the GE500Y259 water hammer arrestor kit cannot be present.
WARNING. In case of installation of the recirculation kit, the measurement
of the total m3 of water consumed is counted by the water meter installed on
the domestic water inlet unit (B). The water meter on the domestic water outlet
unit (C) is not necessary.

13
Giacomini S.p.A.
Via per Alzo 39, 28017 San Maurizio d’Opaglio (NO) Italia
[email protected]om
[phone] - giacomini.com
1
2
BASIC
DOMESTIC WATER CIRCUIT PRIMARY
CIRCUIT
SECONDARY
CIRCUIT
OPTIONALS
Heat exchangers Control
components Insulation Other optionals
GE556Y503
Primary
connections
from bottom
GE556Y511
16-plate exchanger
+ 5 mm insulation
GE556Y521
DHW production
without controls
GE556Y531
Primary circuit
connections
with no controls
GE556Y544
Secondary circuit,
direct heating with
presetting valve
GE556Y552
Insulation
GE556Y561
Unit output of
DCW outlet
GE556Y504
Primary
connections
from top
GE556Y512
16-plate exchanger
+ 20 mm insulation
GE556Y522
DHW production
with thermostatic
control
GE556Y532
Primary circuit
connections with
double regulation
differential pressure
control valve
GE556Y564
Unit output for
domestic water
recirculation, with
circulator
GE556Y513
26-plate exchanger
+ 5 mm insulation
GE556Y530
Primary circuit
connections with
compact differential
pressure contr. valve
GE556Y565
Unit output for
domestic water
recirculation
without circulator
GE556Y514
26-plate exchanger
+ 20 mm insulation
GE556Y566
Thermostatic
by-pass to maintain
exchanger DHW
temperature
GE556Y515
36-plate exchanger
+ 5 mm insulation
GE556Y569
System drain cocks
GE556Y516
36-plate exchanger
+ 20 mm insulation
Thermostatic by-pass GE556Y566
The thermostatic by-pass kit maintains the exchanger
temperature for production of domestic hot water.
Fit the thermostatic by-pass kit on the HIU, screwing the
special nuts on the HIU Tee ttings (Ref. 1 and 2) to ensure
hydraulic seal.
• Weight: 0,5 kg
GE556Y566
Thermostatic by-pass to
maintain exchanger DHW
temperature
NOTE. Thermostatic by-pass kit GE556Y566 must be installed with domestic
water recirculation kit GE556Y564/GE556Y565.
Thermostatic by-pass kit GE556Y566 cannot be combined to kit GE556Y521.
Kv of domestic water primary circuit with by-pass kit and temperature setting through thermostatic head
Setting range of thermostatic heads: 20÷70°C
DE
10000
1000
∆P [mm H2o]
Q [l/h]
100
10
10 100 100001000
Kv = 0,62
5000
Differential pressure
regulation range

14
Giacomini S.p.A.
Via per Alzo 39, 28017 San Maurizio d’Opaglio (NO) Italia
[email protected]om
[phone] - giacomini.com
1 2
2
1
BASIC
DOMESTIC WATER CIRCUIT PRIMARY
CIRCUIT
SECONDARY
CIRCUIT
OPTIONALS
Heat exchangers Control
components Insulation Other optionals
GE556Y503
Primary
connections
from bottom
GE556Y511
16-plate exchanger
+ 5 mm insulation
GE556Y521
DHW production
without controls
GE556Y531
Primary circuit
connections
with no controls
GE556Y544
Secondary circuit,
direct heating with
presetting valve
GE556Y552
Insulation
GE556Y561
Unit output of
DCW outlet
GE556Y504
Primary
connections
from top
GE556Y512
16-plate exchanger
+ 20 mm insulation
GE556Y522
DHW production
with thermostatic
control
GE556Y532
Primary circuit
connections with
double regulation
differential pressure
control valve
GE556Y564
Unit output for
domestic water
recirculation, with
circulator
GE556Y513
26-plate exchanger
+ 5 mm insulation
GE556Y530
Primary circuit
connections with
compact differential
pressure contr. valve
GE556Y565
Unit output for
domestic water
recirculation
without circulator
GE556Y514
26-plate exchanger
+ 20 mm insulation
GE556Y566
Thermostatic
by-pass to maintain
exchanger DHW
temperature
GE556Y515
36-plate exchanger
+ 5 mm insulation
GE556Y569
System drain cocks
GE556Y516
36-plate exchanger
+ 20 mm insulation
System drain cocks
GE556Y569
The system drain cocks can be installed on the ttings of the
primary outlet (Ref. 1) and high-temperature heating delivery
circuits (Ref. 2). Installation varies based on the type of system
(primary connections from top or bottom), as shown below.
To install the drain cocks, remove the HIU tting caps and
screw on the self-sealing cocks using a 12 mm Allen wrench.
• Weight: 0,5 kg
GE556Y569
System drain cocks

15
Giacomini S.p.A.
Via per Alzo 39, 28017 San Maurizio d’Opaglio (NO) Italia
[email protected]om
[phone] - giacomini.com
Metal cover GE551Y184
The metal cover kit can be installed only on HIUs including
GE551Y087 template with insulation.
The kit includes a RAL 9010 varnished metal cover (Ref. 1), an
upper bracket to snap on the cover (Ref. 2) and a lower bracket
to lock the HIU (Ref. 3).
To install cover kit GE551Y184, follow the steps below:
1) t the upper bracket to the wall (ref. 2) placing it on the
insulation and making sure the holes (ref. A) are facing up
(use screw anchors t for the type of wall and equipment
weight).
2) t the lower bracket (ref. 3) on the template using the
self-locking screws included and making sure the fold is
facing up.
3) snap the metal cover (ref. 1) on the upper bracket (ref. 2),
inserting the special metal teeth (ref. B) in the upper
bracket holes (ref. A).
The HIU is ready to be closed using the special lock on the
lower section of the metal cover (ref. C).
To access the HIU for inspection and/or maintenance,
remove the metal cover completely, tilting it slightly and
sliding it o the upper bracket.
• Weight: 4,5 kg
GE551Y184
HIU locking metal cover
NOTE. The metal cover can be installed only when template GE551Y087 is
included. It cannot be installed on lowered template GE551Y088.
2
A
A
1
BB
C
3
A
A
B
B
2
A
A
1
BB
C
3
A
A
B
B
2
A
A
1
BB
C
3
A
A
B
B
GE551Y087
Template with 6 shut-off valves,
for GE556Y503 or GE556Y504 HIU
including insulation GE556Y552
GE551Y088
Lowered template with 6 shut-off valves, for
GE556Y503 or GE556Y504 HIU
without insulation
GE500Y258
Additional DCW valve,
for installation on template with
GE556Y561 optional kit
GE551Y184
HIU locking metal cover, for HIU
GE551Y087 with template only
R473 / R473M
Thermo-electric actuator normally
closed to control presetting valve
included with kit GE556Y544
R473X221: 230 V
R473X222: 24 V
R473MX221: 230 V
R473MX222: 24 V
GE552
Thermal energy meter
GE552Y159
3/4”, volumetric, 1,5 m3/h, M-Bus
GE552Y216
3/4”, volumetric, 1,5 m3/h, M-Bus,
with M-Bus Wireless predisposition
GE552Y122
3/4”, ultrasonic, 1,5 m3/h, M-Bus
GE552-2
Domestic water meter
GE552Y190
3/4”, domestic cold water, to be
ordered separately if GE556Y561
additional unit output is present
GE552Y191
3/4”, domestic hot water

16
Giacomini S.p.A.
Via per Alzo 39, 28017 San Maurizio d’Opaglio (NO) Italia
[email protected]om
[phone] - giacomini.com
HYDRAULIC CHARACTERISTICS
Domestic water: domestic hot water (DHW) production
Primary circuit for DHW production
DE
10000
5000
1000
∆P [mm H2o]
Q [l/h]
100
10
10 100 100001000
Kv = 1,4
Differential pressure
regulation range
Primary circuit with thermostatic by-pass for DHW production
DE
10000
1000
∆P [mm H2o]
Q [l/h]
100
10
10 100 100001000
Kv = 0,62
5000
Differential pressure
regulation range
WARNING. For the correct operation of the HIU, the differential pressure control valve of the GE556Y530 or GE556Y532 kit, can’t be adjusted above 0,5 bar (factory
setting).

17
Giacomini S.p.A.
Via per Alzo 39, 28017 San Maurizio d’Opaglio (NO) Italia
[email protected]om
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Secondary circuit: DHW production
B
C
10000
1000
∆P [mm H2o]
Q [l/h]
100
10
10 100 100001000
Kv = 0,8
High-temperature heating with kit GE556Y544 (presetting valve)
DE GF
Presetting valve
position 0.51234567 N (Fully Open)
Kv
(R402PTG 3/4”) 0.14 0.26 0.29 0.34 0.38 0.44 0.54 0.60 0.70
10000
1000
∆P [mm H2o]
Q [l/h]
100
10
10 100 100001000
N0,5 1 2 3 4 5 6 7
5000
Differential pressure
regulation range
Heating

18
Giacomini S.p.A.
Via per Alzo 39, 28017 San Maurizio d’Opaglio (NO) Italia
[email protected]om
[phone] - giacomini.com
OPERATIONAL DATA
Domestic water: domestic hot water (DHW) production
DHW production with 16-plate exchanger and 12 l/min
ow rate controller (GE556Y511, GE556Y512)
Domestic hot water
(Δt 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]
8 480 22
80 330 20
75 420 21
70 420 22,5
65 500 24
60 600 27
10 600 28
80 420 21
75 470 22,5
70 540 24,5
65 650 26
12 720 34
80 515 23
75 575 24
70 660 25,5
DHW production with 16-plate exchanger and 15 l/min
ow rate controller (GE556Y513, GE556Y514)
Domestic hot water
(Δt 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]
10 600 28
80 390 18
75 440 19
70 490 20
65 570 22
60 690 25
12 720 34
80 480 19
75 535 20
70 600 21
65 710 23,5
15 900 42
80 620 20,5
75 690 21,5
70 785 23
WARNING. For the correct operation of the HIU, the differential pressure control valve of the GE556Y530 or GE556Y532 kit, can’t be adjusted above 0,5 bar (factory
setting).

19
Giacomini S.p.A.
Via per Alzo 39, 28017 San Maurizio d’Opaglio (NO) Italia
[email protected]om
[phone] - giacomini.com
Heating
High-temperature heating with kit GE556Y544
Nominal ow rate of high-temperature heating circuit: 480 l/h @ ΔT 10 °C (80-70 °C) for 5.5 kW
DHW production with 16-plate exchanger and 18 l/min
ow rate controller (GE556Y515, GE556Y516)
Domestic hot water
(Δt 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 34
80 460 16,5
75 510 18
70 575 19
65 665 21
60 790 23
14 840 39
80 545 17
75 600 18,5
70 700 20
65 800 22
16 960 45
80 630 18
75 710 19,5
70 800 21
18 1080 50
80 720 19
75 800 20
70 910 22

20
Giacomini S.p.A.
Via per Alzo 39, 28017 San Maurizio d’Opaglio (NO) Italia
[email protected]om
[phone] - giacomini.com
Installation
Wall mounting of template GE551Y078 or GE551Y087-088
NOTE. Refer to datasheet 0962ML for proper installation of the template.
Mount the template on the wall using screw anchors t for
the type of wall and weight of the equipment, leaving a
distance of at least 1000 mm between the template base
and the ceiling.
The HIU can be installed at any height of the wall, however
we recommend leaving a 1500 mm min. distance between
the oor and the HIU cover base.
Install the ball valves in the template holes and x them with
the washers using a wrench.
Connect the system pipes to the template 3/4”M ball valves
using suitable adapters.
Refer to the template label for proper installation of the
pipes.
Min. 1000 mm
For an easier installation, the HIU includes 3/4”F at nuts
with adjustable tail pieces (10 mm extension).
Before tting the HIU on the wall, extend every single
adjustable tail piece up to its max. length (A).
X mm 207 mm 390 mm
288 mm
410 mm
X mm 207 mm 390 mm
288 mm
410 mm
60 mm
Max. 60 Nm
ABC
D
E
F
G
Installation of HIU on template
Using a hard surface as reference, press all the adjustable
tail pieces (previously extended to their max. length) at the
same time to align them. (B).
X mm 207 mm 390 mm
288 mm
410 mm
X mm 207 mm 390 mm
288 mm
410 mm
60 mm
Max. 60 Nm
ABC
D
E
F
G
WARNING. Risk of scalding and electric shock.
Installation must be carried out by qualied operators authorized by the building administrator.
Comply with regulation of use (installation, xing, etc...), operation, recalibration and replacement of meters. Also refer to assembly instructions included with every
meter.
IMPORTANT WARNING. As a consequence of transport, connections may be loose due to vibrations. Make sure all at seat connections are well established during
commissioning.
WARNING. Before installing the HIU on the template it is necessary to wash all the pipes.
WARNING. Any unused connections and ball valves must be closed with a plug.