Giacomini GE556-4 Series Operating instructions

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ge556-4 series
GE556Y320 - GE556Y321
(High temperature)
GE556Y322 - GE556Y323
(Low temperature)
Index
1. General information ....................................................................................................................................................... 1
1.1 Warnings ........................................................................................................................................................1
1.2 Versions and product codes............................................................................................................................. 1
1.3 Completion codes ......................................................................................................................................... 2
1.4 Main characteristics ....................................................................................................................................... 2
1.5 Technical data ................................................................................................................................................ 2
1.6 Dimensions ....................................................................................................................................................3
2. Operation ....................................................................................................................................................................... 4
2.1 GE556Y320-GE556Y321 operation .................................................................................................................4
2.1.1 GE556Y320-GE556Y321 operational data .....................................................................................6
2.1.2 GE556Y320-GE556Y321 energy saving characteristics .................................................................. 8
2.2 GE556Y322-GE556Y323 operation ..................................................................................................................10
2.2.1 GE556Y322-GE556Y323 operational data ......................................................................................12
2.2.2 GE556Y322-GE556Y323 energy saving characteristics ................................................................. 14
3. Components .................................................................................................................................................................. 16
4. Installation.........................................................................................................................................................................17
4.1 Unpacking ..................................................................................................................................................... 17
4.2 Installation set-up ............................................................................................................................................ 17
4.3 Hydraulic system precautions ........................................................................................................................ 17
4.4 Electric system precautions.............................................................................................................................. 17
4.5 Template and HIU installation .................................................................................................................... 17
4.6 Start-up ............................................................................................................................................................19
4.6.1 GE556Y320-GE556Y321 start-up ................................................................................................... 19
4.6.2 GE556Y322-GE556Y323 start-up ................................................................................................... 20

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4.7 Flow and energy meter installation.................................................................................................................. 21
4.8 HIU electric connections ........................................................................................................................... 21
4.9 Thermostat electric connections ..................................................................................................................... 21
4.9.1 General warnings ........................................................................................................................... 21
4.9.2 Positioning of thermostat ..............................................................................................................21
4.10 Electric diagrams ...........................................................................................................................................22
4.10.1 GE556Y320-GE556Y321 HIU electric diagrams ...................................................................... 22
4.10.2 GE556Y322-GE556Y323 HIU electric diagrams ...................................................................... 23
5. HIU setting ................................................................................................................................................................. 24
5.1 Setting of dierential pressure control valve ....................................................................................................24
5.2 Setting of primary by-pass ...............................................................................................................................26
5.3 GE556Y320-GE556Y321: setting of static balancing valve ............................................................................... 26
5.4 GE556Y322-GE556Y323: setting of thermostatic head and circulator ............................................................. 27
6. Troubleshooting ............................................................................................................................................................... 28
6.1 DHW temperature too low ...............................................................................................................................
28
6.2 DHW temperature too high .............................................................................................................................28
6.3 Heating circuit water temperature too low ..................................................................................................... 28
6.3.1 GE556Y320-GE556Y321 ................................................................................................................28
6.3.2 GE556Y322-GE556Y323 ................................................................................................................29
6.4 Heating circuit water temperature too high ....................................................................................................30
6.4.1 GE556Y320-GE556Y321 ................................................................................................................30
6.4.2 GE556Y322-GE556Y323 ................................................................................................................30
6.5 Heating circuit not working .............................................................................................................................30
6.5.1 GE556Y320-GE556Y321 ................................................................................................................30
6.5.2 GE556Y322-GE556Y323 ................................................................................................................30
6.6 Noise in the heating system ............................................................................................................................ 31
7. Inspections and service ....................................................................................................................................................32
8. Spare parts ...................................................................................................................................................................... 32
8.1 GE556Y320-GE556Y321 HIU spare parts ................................................................................................... 32
8.2 GE556Y322-GE556Y323 HIU spare parts .................................................................................................... 33
8.3 GE551Y075 template spare parts ....................................................................................................................34
9. Compliance statements ...................................................................................................................................................35

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ge556-4 series
1. General information
GE556Y320, 321, 322 and 323 HIUs enable metering thermal energy consumptions when heating and the production of Domestic
Hot Water (DHW) in modern autonomous systems with heat centralized production (eg. teleheating).
HIUs are controlled thermostatically by means of a 3-way priority valve.
Thermostatic control provides for the lowest return temperature when producing hot water.
1.1 Warnings
• Installation must be carried out by qualied personnel authorized by the building administration body. Comply with the regulations
in terms of use (installation, tting, etc...), operation, re-gauging and replacement of metering units. Also refer to assembly instructions
included with every metering unit.
• Risk of scalds and electric shocks. Only qualied personnel authorized by the building administration body should access the HIU.
Misuse may cause serious injuries to people and damage the system.
• An excessive temperature of the Domestic Hot Water may cause scalds to people; too cold water may lead to undesired bacterial
growth within the hot water system.
• Some HIU parts may overheat, do not touch them.
• Before connecting the HIU to the power line, make sure it has been properly lled with water. Starting the HIU without water inside
may damage the circulator and the HIU.
• When starting up the HIU, make sure no one uses the system water till the water temperature has been adjusted in order to prevent
scalds.
• To prevent polluting agents from entering the system, rst open the primary circuit valves and then the return valves when starting
up the HIU. Open the valves slowly to prevent pressure peaks.
• Do not cut o the electric power from the control panel. This may damage the circulator, the valve actuators, etc...
• The cleaning frequency of the sanitary water exchanger strongly depends on the hardness of the supply Domestic Cold Water.
• With water hardness values higher than 15°f we recommend using anti-scaling devices to be selected based on water characteristics.
• To enhance the resistance to limestone crusting, we recommend adjusting the sanitary water temperature at a value very close to
the value of actual use.
• When installing the HIU to control a low temperature zone, include a low-temperature safety thermostat on the controlled zone.
• Clean the sanitary water exchanger at the end of the rst year; then, based on the limestone crusting status, this period can be
extended to two years.
• 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).
• The electrical installation must be done by qualied personnel, respecting the current legislation and Standards.
1.2 Versions and product codes
Product code Type Number of
exchanger plates Heating side power DHW exchanger nominal power
Template with
valves
GE556Y320 High temperature heating and
DHW production
30 plates 21 kW 56 kW
GE551Y075
GE556Y321 40 plates 67 kW
GE556Y322 Low temperature heating and
DHW production
30 plates 10 kW 56 kW
GE556Y323 40 plates 67 kW
Warning.
• Every HIU includes:
- a label with the HIU model identication data;
- a label proving its compliance with electric and hydraulic tests;
• Every HIU is identied by a serial number both inside and on the packaging.

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1.3 Completion codes
The components listed below may be installed on every HIU:
• Thermal energy meter series GE552
• Domestic Hot Water meter series GE552-2
• Template with 7 interception valves and 3/4”connections: code GE551Y075
1.4 Main characteristics
• Thermostatic regulation to control Domestic Hot Water temperature and heating temperature.
• AISI 316L stainless steel 30 or 40 plates heat exchanger, insulated.
• Flow switch for DHW production priority.
• Motorized 3-way priority valve.
• Automatic air vent valve with hygroscopic plug, pressure gauge and lter on primary side.
• By-pass on primary side to keep the heat exchanger warm.
• Dierential pressure control valve on primary side.
• Brass spacers to install energy and ow meters.
• Varnished metal sheet cabinet (RAL9010) with key lock.
• Safety valve with actuator on heating side.
GE556Y320-321 peculiarity
• Static balancing valve on heating circuit.
GE556Y322-323 peculiarity
• 15/6 - 130 mm electronic circulator.
• Safety pressure switch for low pressures.
• Thermostatic control of heating delivery temperature (23÷67 °C)
1.5 Technical data
• Max. operation temperature: 90 °C
• Max. operation pressure: 10 bar
Warning.
Max. operation dierential pressure for primary side = 2 bar (dierential pressure control valve)
• DHW secondary circuit temperature range: 20÷70 °C (SET POINT 50°C)
• Primary nominal ow: 1130 l/h @ 70 °C for 56 kW (GE556Y320, GE556Y321)
1280 l/h @ 70 °C for 67 kW (GE556Y322, GE556Y323)
• Power: 230 V; 50-60 Hz
• Weight: GE556Y320 ~22 kg
GE556Y321 ~23 kg
GE556Y322 ~25 kg
GE556Y323 ~26,5 kg

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1.6 Dimensions
GE551Y075 templates
450
390
ED
BCAFG
1524923 140
292
45 4560 60 60 60 60 60
95
Legend
X: Cable cover
A: Domestic Cold Water inlet
B: Domestic Cold Water outlet
C: Domestic Hot Water outlet
D: Primary inlet
E: Primary outlet
F: Heating delivery circuit
G: Heating return circuit
Dimensions mm
GE556Y320-321 HIUs
450
60 4545 6060606060
630
180
47
ABCEDFG
GE556Y322-323 HIUs
450
60 4545 6060606060
630
180
47
ABCEDFG
X

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2. Operation
2.1 GE556Y320-GE556Y321 operation
P
P
E
DFG
C
B
F
E
H
A
C
A
Legend
Heat exchanger Motorized 3-way priority valve Dierential pressure control
valve (DPC)
CCBrass spacer for DCW ow
meter
P
Dierential pressure probe-holder
A
Thermostatic head for
temperature control of
sanitary side
HHBrass spacer for DHW ow meter Filter Air vent automatic valve
Thermostatic head probe Housing for thermal energy
meter temperature probe Motorized 2-way zone valve
FFFlow switch Primary by-pass Static balancing valve
Pressure gauge EEBrass spacer for thermal energy
meter
A: Domestic Cold Water inlet
B: Domestic Cold Water outlet
C: Domestic Hot Water outlet
D: Primary inlet
E: Primary outlet
F: Heating delivery circuit
G: Heating return circuit

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Primary circuit
E
D
Fig. 1
Inlet (D) and return (E).The primary circuit includes a by-pass, an inspectionable lter, a dierential
pressure probe-holder, a motorized 3-way priority valve, an automatic air vent valve, a heat
exchanger, a pressure gauge, a minimum pressure switch, a thermostatic head to control the
sanitary water temperature and a dierential pressure control valve (DPC).
The thermal energy meter can be installed in place of the brass spacer by inserting its temperature
probe in the corresponding housing (Paragraph “3 Components - Housing for thermal energy
unit temperature probe”).
Heating circuit
E
DG
F
Fig. 2
Delivery (F) and return (G). The heating circuit includes a motorized 2-way zone valve working as
thermal and electric safety device and a static balancing valve.
Domestic Hot Water
Domestic Cold Water inlet (A), Domestic Cold Water outlet (B) and Domestic Hot Water outlet (C).
The DHW circuit includes a ow switch, a heat exchanger and brass spacers to install the DHW
and DCW ow meters.
BC
A
Fig. 3

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2.1.1 GE556Y320-GE556Y321 operational data
Note.
Operational data valid for dierential pressure of the control valve set at 50 kPa.
Primary circuit
Primary circuit for DHW production (see g.1)
Kv = 1,68 Kv = 1,83
10000
1000
ΔP [mm H2o]
Q [l/h]
100
10
10 100 100001000
GE556Y320
GE556Y321
Heating primary circuit - Dynamic balancing valve fully open (see g.2)
Kv = 1,64
10000
1000
ΔP [mm H2o]
Q [l/h]
100
10
10 100 100001000
Primary circuit by-pass
Kv = 0,20
10000
1000
ΔP [mm H2o]
Q [l/h]
100
10
10 100 100001000
Primary circuit by-pass
Heating
Nominal ow rate high temperature heating circuit:
540 l/h @ ΔT 15 °C (65-50 °C) for 9,5 kW
1200 l/h @ ΔT 15 °C (65-50 °C) for 21 kW
410 l/h @ ΔT 20 °C (70-50 °C) for 9,5 kW
910 l/h @ ΔT 20 °C (70-50 °C) for 21 kW

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DCW production
Domestic Cold Water circuit (DCW)
Kv = 6,20
10000
1000
ΔP [mm H2o]
Q [l/h]
100
10
10 100 100001000
DHW production
Domestic hot water GE556Y321
(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 33,5 70 580 20
65 670 22
15 900 42 70 750 22
65 880 24
17 1020 47,5 70 880 23,5
65 1020 25
20 1200 56 70 1050 24,2
65 1230 26
22 1320 61,5 70 1160 24,6
24 1440 67 70 1280 25
Domestic hot water GE556Y320
(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 33,6 70 620 23
65 730 25
15 900 42 70 800 24
65 940 26
17 1020 47,6 70 940 26
65 1090 27
20 1200 56 70 1130 27
Domestic Hot Water circuit (DHW)
10000
1000
ΔP [mm H2o]
Q [l/h]
100
10
10 100 100001000
GE556Y320
GE556Y321
Kv = 1,70 Kv = 1,80
Note.
For regulation of static balancing valves and dierential pressure control valves (Paragraph“5 HIU setting”).

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2.1.2 GE556Y320-GE556Y321 energy saving characteristics
Hot water primary circuit ow based on DHW ow at 45 °C
30 plate model
Primary ow [l/h]
Hot water primary circuit ow based on DHW ow at 50 °C
30 plates model
Primary ow [l/h]
Hot water primary circuit ow based on DHW ow at 55 °C
30 plates model
Primary ow [l/h]