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Taking comfort control in
apartments and multi-use
dwellings to a higher level
CourtesyofParkridge-www.d
ickensheathvillage.com
Giacomini Heat Interface Units(with optional Energy & Water Meters)
G3 & G4 ECO
G4 Eco Twin
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A range of models to suit every application
G3 Twin Heat Exchanger 44kW and 58kW G3 Single Heat Exchanger 44kW
G4 Eco Twin Heat Exchanger 44kW and 58kW G4 Eco Single Heat Exchanger 44kW
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Jig bracket supplied as standard
First fix can be carried out without the heat
interface unit being on site. Prevents site
theft and site damage. No need to purchase
unit until it is required, easing cash flow.
Jig bracket is supplied as standard with
all relevant isolating valves
No hidden additional costs.
Jig bracket comes with Y strainers
supplied
Stops any debris in the system entering the
unit, preventing damage, blockages or any
reduction of the efficiency of the plate heat
exchangers.
Jig bracket supplied as standard with Part
L compliant WRAS approved filling loop.No hidden additional costs.
Jig bracket available with a 50mm offset
This leaves a 50mm void at the rear of the
unit to enable pipework to run behind the
main body of the unit, making installation
faster, easier and aesthetically pleasing.
Domestic hot water (DHW) and central
heating (CH) circuits run in parallel
No troublesome diverter valves, which are
renowned for causing problems, are used or
needed, giving a much simpler operation.
Stainless steel heat exchangersLess likely to suffer from scale which can
reduce efficiency and can, in extreme cases,
block the waterway completely.
Twin heat exchanger model gives both
indirect CH and DHW
Should the property develop a leak in the
system, only the water inside the property
would be expelled, lessening likely damage.
Also instantaneous hot water availability, no
storage or cylinder required.
Single plate heat exchanger models ideal for
direct DHW, where a cylinder or hot water
storage is preferred, or where a cylinder is
already in place, e.g. the replacement market.
Optional energy meter
Allows each tenant to be billed for the energy
he or she consumes.
Optional water meter
Water meter can be housed securely inside
the HIU when fitted outside the apartment.
Built-in dynamic balancing and
commissioning valve
Balances the system throughout the
apartment block when a large number of
units are installed, maintaining optimum
performance in each apartment.
HIU housed in a metal, powder-coated
casing, which is lockable
Aesthetically pleasing and secure.
Lightweight and compact
Can be housed in a cupboard. Easy to handleand install.
E: [email protected] W: www.giacomini.co.uk
The New Giacomini G3 & G4 Eco Heat InterfaceUnits for communal heating systems
Main Benefits AT A GLANCE
Helping to minimise the heat source
requirement and further reduce energy
consumption
The G4 Eco has, as standard, a motorized valve
fitted that can shut off the heat exchanger for
heating when not in use to save energy and cut
fuel bills. It also has an option to fit a further
motorized valve on the domestic hot water heat
exchanger. This combination of valves
minimizes the energy extracted from the
primary flow, allowing a greater diversity factor
and a smaller heat source requirement when
sizing the boiler. This can result in significant
energy savings, lower emissions and is ideal for
use with renewable technologies, where the
energy produced is limited.
Additional Benefits of the G4 ECOG4 Eco Twin
G3 Twin
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With no need for a gas supply, flues, or hot water cylinders,
the new heat interface unit from Giacomini provides all the
benefits of a combi boiler without the combustion.
Compact in size and simple to install, this versatile unit
controls and measures hot water and heating usage in
apartments supplied from a communal boiler system. It
delivers major benefits to everyone concerned, from the
building contractor and installer to the tenants and
landlords.
For the building contractor and the installer, the advantages
are simplicity of installation; theres no need for a gas supply,
flue or hot water cylinder and little or no servicing
requirement once installed. With no need for hot water
storage, Giacominis neat and compact heat interface unit
its just 450mm wide by 670mm high and 200mm in depth
also saves on valuable space, compared to a conventional
individual heating system.
For the tenants and the landlord there are major advantages.
The new heat interface unit meets the need to control and
monitor the heating and sanitary water consumption of
tenants in flats, apartments or multi-dwelling buildings,
according to their individual needs.
Monitoring energy consumptionOne of the key advantages for the tenant is the direct linking
of their energy bill to personal consumption. For the landlord,
the key advantage is the ability to remotely monitor and
analyse the energy consumption of both individual users and
the overall system through a special interface fitted within the
unit. This uses the latest M-BUS communications technology,
standardised throughout Europe.
The principal difference between the heat interface unit and a
conventional individual boiler is that the usual heating source
is replaced with a heat exchanger fed from a central
communal hot water supply. A primary plate heat exchanger is
used for the provision of heating and a secondary plate heatexchanger for domestic hot water production. These are
configured as a sealed system in the heat interface unit,
together with an expansion tank, safety valve and filling loop.
The result gives each Giacomini unit the effectiveness and
flexibility of a combi boiler, without the need for individual
combustion.
Accurate measurement of energy usage is obtained via
compact volumetric meters, which are of a single jet turbine
type that provide high precision and reliability in compliance
with standard EN 1434. Well engineered, all components are
installed in a durable zinc-plated casing, supplied with fittings
for easy wall mounting.
Advantages for the building contractor
Simplicity of installation no gas supply, no flues and
no cylinders
Jig Bracket, Valves, Y Strainer and WRAS approved Filling
Loop supplied as standard (see page 5)
Saves space no hot water cylinder required
Lower servicing costs
Advantages for the tenant
The tenant is aware that bills are linked directly to personalconsumption
Optional energy metering display allows tenants to see how
much energy is being consumed and to individually adapt to
changing circumstances
Greater efficiencies for individual users lowers both costs
and emissions
Advantages for the landlord
Through remote monitoring, Giacomini heat interface units
provide the landlord with comprehensive data for analysis
with a consequent major energy saving opportunity Possibility of central conversion to other kinds of fuel,
without major cost implications for satellite units
Adaptable for remote heating control
More secure and less intrusive, through centralised
data collection
Maintenance costs shared across all residents
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Data centralisation
The direct reading of measured data is possible on each
metering device, using an analogue or digital display. However,
this may not conform to tenants privacy agreements, where
metering units are installed in common areas or outside
apartments.
Additionally, direct reading of individual meters is time
consuming, subject to human error and requires installation
of metering units in positions easy to access. For these
reasons, Giacomini metering modules and heat interface units
are provided with metering devices fitted with a special
interface for M-BUS communication, the European standard
for remote reading of energy meters. All data is detected
electronically so that it can be sent via the communication
M-BUS.
A concentrator periodically interrogates all M-BUS devices,
collecting consumption data and making it available locally
or remotely, for sharing and analysis. Data reading becomes
fast, convenient and possible at all times, even when tenants
are out.
All the benefits of a
combi boiler without
the combustion
Optional accessories
Sanitary water meter (M-BUS)
For the monitoring of water consumption via M-BUS to central
collection point.
Other meter options, such as wireless / pre-pay meters, are
available on request.
Energy meter (M-BUS)
For the monitoring of energy consumption sending data to a
central collection point via M-BUS.
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1 Energy meter (optional)
1a = volumetric reader
1b = meter display
2 Sanitary water meter (optional)
3 Insulation in expanded PEx (optional)
4 Electrical motor for the zone valve for DHW
production (optional)
5 Jig with interception valves
Insulation panel
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G4 Single
G4 Twin
G3 TwinG3 Single
Operation
Technical data - All models - G3 & G4
Maximum working temperature of the primary circuit and
secondary circuits (heating and sanitary): 90C
Maximum working pressure of the primary circuit and
secondary sanitary: 10 bar
Maximum working pressure of the heating secondary circuit:
3 bar (safety valve setting)
Nominal primary flow: 1000 1250 L/h (depending on the
required sanitary power and the type of heating, by radiant
floor or by radiators)
Versions and part numbers
Part number Type Heat exchanger
nominal power
G3 Single Heating 44kW
G3 Twin Heating and DHW production 44kW
G3 Twin Heating and DHW production 58kW
G4 Eco Single Heating 44kW
G4 Eco Twin Heating and DHW production 44kW
G4 Eco Twin Heating and DHW production 58kW
Table 1 Codes
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Sanitary:cold inlet (Pages 9/10: Fig.5-C), cold outlet (Fig.5-D),
hot outlet (Fig.5-E). In place of the spacer (Fig.5-9), a sanitary
water meter can be installed.
Heating:inlet (Fig.5-F) and outlet (Fig.5-G). The circuit is
simply composed of exchanger and circulator. As it deals with
a closed circuit, the equipment is completed by: expansion
vessel, safety valve, manometer.
Primary:flow (Fig.5-B) and return (Fig.5-A). The energy meter
can be installed in place of the spacer (Fig.5-8, installing the
inlet temperature probe in the appropriate housing (Fig.5-10).
For G3-G4 single, the primary circuit operates only for the
heating circuit; the primary circuit is composed of a balancing
valve and a differential pressure controller that work togetherto perform automatic balancing (see Figure 3 below); the heat
exchanger and the thermostatic valve with remote bulb
regulate the power for the heating circuit. The zone valve can
manage the heating by means of a chrono-thermostat.
For G3-G4 twin, the primary circuit is divided in two
symmetrical arms: one is for the heating handling, the other is
for the production of hot sanitary water. These two arms are
completed by: heat exchanger, thermostatic valve with remote
bulb, the balancing valve, and differential pressure controller.
The balancing valve and a differential pressure controller
valve work together to perform the automatic balancing (see
Figure 3). The zone valve can manage the holiday function(motor of the zone valve is optional).
Figure 4 Balancing devices
Differential pressure controllerNOTE: Setting scale in RED
Static balancing valve
NOTE: Setting scale in WHITE
Figure 3 Automatic balancing operation for the primary
circuit.
(QA = Primary flow rate; QB = Secondary flow rate;
QC = Bypass flow rate)
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Components G3
Table 2 Components (see Figure 5)
Figure 5 Components
A = Primary outlet
B = Primary inlet
C = Cold water inlet
D = Cold water outlet
E = Hot water outlet
F = Heating inlet
G = Heating outlet
1 Heat exchanger, heating
function
2 Manual air vent, primary
circuit
3 Expansion vessel, heating
circuit
4 Primary balancing -
differential pressure
controller valve
5 Primary balancing staticbalancing valve
6 Heat exchanger, sanitary
hot water function
7 Backflow preventer
8 Spacer pipe for energy
meter
9 Spacer pipe for sanitary
water meter
10 Flow temperature probe
housing for energy meter
11 Manual air vent, heating
circuit
12 Thermostatic valve, heating
function
13 Electric box
14 Primary balancing for
heating circuit static
balancing valve
15 Thermostatic valve sensor
heating function
16 Thermostatic valve,
sanitary hot water function
17 Circulator, heating function
18 Thermostatic valve,sanitary hot water function
19 Manometer heating
function
20 Safety valve, heating
circuit
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Components G4 Eco
Figure 5 Components
Table 2 Components (see Figure 5)
A = Primary outlet
B = Primary inlet
C = Cold water inlet
D = Cold water outlet
E = Hot water outlet
F = Heating inlet
G = Heating outlet
1 Heat exchanger, heating
function
2 Manual air vent, primary
circuit
3 Primary balancing for
heating circuit static
balancing valve
4 Primary balancing -
differential
5 Primary balancing static
balancing valve
6 Heat exchanger, sanitary
hot water function
7 Backflow preventer
8 Spacer pipe for energy
meter
9 Spacer pipe for sanitary
water meter
10 Flow temperature probe
housing for energy meter
11 Manual air vent, heating
circuit
12 Thermostatic valve, heating
function
13 Electric box
14 Motorized zone valve
heating function pressure
controller valve
15 Expansion vessel, heating
circuit
16 Thermostatic valve sensor
heating function
17 Zone valve for DHW
production isolation
18 Thermostatic valve,
sanitary hot water function
19 Circulator, heating function
20 Thermostatic valve sensor
sanitary hot water function
21 Manometer heating
function
22 Safety valve, heating
circuit
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Heating
Adjust the heating temperature through the thermostatic
head (Fig.5-12).
Warning!
Provide for a safety thermostat for the lowtemperature heating applications.
If you note that the rating temperature of the heating is
higher than the set value, the flow of the primary may be
too high and the thermostatic head is not able to close. In
this case, open the differential pressure controller valve
(Fig.5-4). About the regulation, see Page 8, Figure 4.
To balance the heating production functions, you may work
with the static balancing valve (Page 9 Fig.5-5, Page 10
Fig.5-3) and the primary balancing valve (Fig.5-5) but the
latter also affects the hot water production.
Finally it is possible to change the heating power by
modifying the circulator speed that has 3 speeds (Page 9
Fig.5-17, Page 10 Fig.5-19).
Controls and maintenance
Heating circuit pressure
Periodically adjust the pressure of the heating circuit by
means of the manometer (Page 9 Fig.5-19, Page 10 Fig.5-21).
The pressure value must be maintained over 1 bar (pressure
values under 1 bar can damage the circulator by cavitation).
A device for filling is supplied (the satellite has no internal
filling loop). During the filling, the safety valve may activate
(Page 9 Fig.5-20, Page 10 Fig.5-22).
Warning: danger of burns.
In order to eliminate the air in the heating circuit, use themanual air vent (Fig.5-2 and Fig.5-11).
Safety valve
Periodically work the manual hand wheel of the safety valve
(Page 9 Fig.5-20, Page 10 Fig.5-22) for a good service of the
valve. Be careful to check for leakage of the water from the
discharge.
Warning: danger of burns.
Warning!
The set value represents the rating value; the
thermostatic head is not as precise as a
thermostatic mixer and in transitory phases (unexpected
openings) does not guarantee the precise set value, youmay have even +/-15C as regards to the set value, for a
short period of time.
Adjustments
Sanitary hot water temperatureAdjust the temperature of the sanitary hot water using the
thermostatic head (Fig.5-12):
Position 23 34 45 56 67 Fully Open
Temperature 23C 34C 45C 56C 67C Maximum
Position 23 34 45 56 67 Fully Open
Temperature 23C 34C 45C 56C 67C Maximum
Warning!
Danger of burns. The thermostatic head for
the regulation of the sanitary hot watertemperature serves to set the temperature
rating value.
To avoid burns, provide for a thermostatic mixer
downstream of the satellite.
If you note that the rating temperature of the sanitary hot
water is higher than the set value, the flow of the primary
may be too high and the thermostatic head is not able to
close. In this case, open the differential pressure controller
valve (Fig.5-4). About the regulation, see Page 8, Figure 4.
To balance the sanitary hot water production functions,
you may work with the primary balancing valve (Fig.5-5).
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Wiring for G3 modelsWiring for G4 models
Electrical connections
On top right of the satellite there is an electrical box IP55 (see
Fig.5-13) containing the terminals (see Figure 7 below) for the
electrical connections for the M-BUS (optional) devices and for
the control and supply of the circulator (Page 9 Fig.5-17, Page
10 Fig.5-19).
Technical data
Supply voltage for circulator: 230V +10% / -15%: 50Hz 5%
Maximum electrical power for the circulator on the three
speeds = 132W, 92W, 62W.
Maximum electrical power for one electrical motor of the
zone valve = 3.5W (1A).
External connections
External power supply (230V~) should be connected to the
terminal box to terminals 7 and 8, 10 and 11 in Figure 7. Use a
two-conductor cable with 0.5mm2 section. No polarity need be
complied with for the connection of the terminals.
Functioning consent
Concerning the connection of the functioning consents, the
consent should be given through the normally open contact
(N.O. contact, see Figure 7). For the connection of thefunctioning consent (terminals 6, 7 and 9, 10) use a two-
conductor cable with 0.5mm2 section. No polarity should be
complied with for the connections.
M-BUS
For the connection of the M-BUS data transmission cable to
the concentrator use terminals 1 (RED conductor L1+) and to
terminal 2 (GREEN conductor L2-) of the terminal box, see
Figure 7.
Figure 7 Electrical connections of the terminal box
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Figure 10 Primary circuit for hot sanitary water production.
Pressure losses depending on the setting of the static
balancing valve (Fig.5-5). Legend. 1, 2, 3, 4, 5: see scale on the
body by the handle of the valve (Page 8 Fig.4).
Figure 11 Primary circuit for heating.
Pressure losses depending on the setting of the static
balancing valve (Page 9 Fig.5-14, Page 10 Fig.5-3) when the
static balancing valve (Fig.5-5) is completely open.
Legend. -1/2, -3/4, -1, -2 = number of revolutions starting from
closed; f.o. = full open.
Primary circuit - All models
Heating
Figure 8 Heating flow rate diagrams.
Figure 9 Hydraulic data for hot and cold sanitary
water circuits (Ref. See table 7)
Sanitary circuit
Table 7 Hydraulic data for hot and cold sanitary water circuits.
Kv Decription Ref fig. 2
1.85 Hot sanitary circuit C-D
4.41 Cold sanitary circuit C-E
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Heating Radiators Flow Rate (l/h) and Primary Outlet
Temperature (radiators 65-55C)
circular flow rate power 80C 75C 70C
speed m3/h (kW)
I 1 11.6 430 580 975
(56.6C) (57C) (59C)
II 1.25 14.5 550 750 1320
(57.2C) (58C) (60C)
III 1.5 17.4 680 950 1750
(67.8C) (59C) (61C)
Table 6 Primary circuit and radiators heating for
satellites with standard heat exchanger.
Heating
Heating - Radiant Floor Flow Rate (l/h) and Primary Outlet
Temperature (radiant floor 45-39C)
circular flow rate power 75C 70C 65C 60C
speed m3/h (kW)
I 1 7.0 240 300
(39C) (39C)
II 1.25 8.7 240 300 375
(40C) (40C) (40C)
III 1.5 10.5 290 350 450
(40C) (40C) (40C)
Table 7 Primary circuit and radiant floor heating for
satellites with standard heat exchanger.
Heating Radiators Flow Rate (l/h) and Primary Outlet
Temperature (radiators 65-55C)
circular flow rate power 80C 75C 70C
speed m3/h (kW)
I 1 11.6 410 525 780
(55.4C) (55C) (57C)
II 1.25 14.5 515 670 1010
(55.6C) (56C) (57C)
III 1.5 17.4 620 810 1250
(55.8C) (56C) (58C)
Table 8 Primary circuit and radiators heating for
satellites with large heat exchanger.
Heating
Heating - Radiant Floor Flow Rate (l/h) and Primary Outlet
Temperature (radiant floor 45-39C)
circular flow rate power 75C 70C 65C 60C 55C
speed m3/h (kW)
I 1 7.0 220 280 380
(39C) (39C) (39C)
II 1.25 8.7 290 365 480
(40C) (40C) (39C)
III 1.5 10.5 300 350 430 590(39C) (40C) (39C) (39C)
Table 9 Primary circuit and radiant floor heating for
satellites with large heat exchanger.
Sanitary Flow Rate (l/h) and Primary Outlet
Temperature (sanitary 10-50C)
l/min l/h kW 80C 75C 70C 65C 60C
12 720 29 510 580 690 865 1210
(22.9C) (25C) (27.9C) (31.4C) (36C)
15 900 37 670 775 935 1200
(25.7C) (28.1C) (31.1C) (34.8C)
17 1020 41 785 920 1120 1480
(27.5C) (30.2C) (33.2C) (37.1C)
20 1200 49 975 1150 1430
(30.2C) (32.9C) (36.1C)
Sanitary Flow Rate (l/h) and Primary Outlet
Temperature (sanitary 10-50C)
l/min l/h kW 80C 75C 70C 65C 60C
12 720 29 450 495 565 660 825
(15.4C) (16.9C) (18.7C) (21.3C) (24.9C)
15 900 37 575 640 730 870 1105
(16.8C) (18.3C) (20.4C) (23.3C) (27.2C)
17 1020 41 660 740 850 1010 1300
(17.7C) (19.4C) (21.6C) (24.4C) (28.5C)
20 1200 49 790 890 1030 1250
(18.9C) (20.7C) (21.3C) (26.3C)
24 1430 58 970 1100 1280
(20.6C)(22.6C) (25.1C)
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Large heat exchanger
Hot sanitary water production
Table 4 Primary circuit and hot water production for
satellites with standard heat exchanger
Hot sanitary water production
Table 5 Primary circuit and hot water production for
satellites with large heat exchanger
Small heat exchanger
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A = Primary outlet
B = Primary inlet
C = Cold water inlet
D = Cold water outlet
E = Hot water outlet
F = Heating inlet
G = Heating outlet
Dimensions - All models
Figure 16 Dimensions (mm)
670
670
200450
W
D
200450
Normative references
UNI EN 1434
Measuring Instruments Directive 2004/22/EC (MID) EN 60751
EN 61107
Ref. Fig. 5 Component Certificate number
- Gaskets 0512513
6 Heat exchanger 0712063
8 Spacer 0507502
7 Backflow preventer 0907056
WRAS certifications
Table 13 WRAS certifications.
Thermal hydraulic performance
Maximum working temperature of the primary circuit and
secondary circuits (heating and sanitary): 90C
Maximum working pressure of the primary circuit and
secondary sanitary: 10 bar
Maximum working pressure of the heating secondary circuit:3 bar (safety valve setting)
Additional information
For further information please contact the following website:
www.giacomini.co.uk
or contact the technical department:
T: 01454 311012
F: 01454 316345
This communication has an indicative value. Giacomini SpA reserves the
right to make at any time, without notice, changes for technical or business
reasons to the articles in this communication. The information contained in
this technical communication does not exempt the user from following
strictly the regulations and rules of good existing practice.
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Notes
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Notes
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COMMERCIAL UNDERFLOOR HEATING
Visit Giacominis
NEW updated website
www.giacomini.co.uk
or call 01454 311012
for an information pack
We design it, manufacture it and then install it
Single point responsibility for the whole system
Pipework guaranteed for 50 years
Brass components guaranteed for 10 years
Full technical assistance at every stage
All thecurves are
in the rightplaces
T O T A L U N D E R F L O O R H E A T I N G S O L U T I O N S
Giacomini
increase in life expectancycompared with conventional valves25%
Up to
Manufactured in Italy to the
highest quality standards,
the Giacomini lever ball
valve range includes the
revolutionary Dado Square
Ball valve, which offers amassive 25% increase in
life expectancy compared
to conventional valves.
DADO technology F x F full port ball valvesin sizes from 1/4 - 4
C x C standard port in sizes from 15 - 28mm
F x F standard port in sizes from 1/4 - 4
All valves WRAS approved
For use with water, oil and gas
For a longer trouble-free working lifewith full traceability, nothing matchesGiacomini lever ball valves.
LeverlastingBall
Valves
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