Giacomini GE556-2 Series Manual

M
etering systeMs
0704EN February 2020
H I U
eat nterface nIt wItH electronIc regUlatIon
ge556Y401, ge556Y402
ge556-2
serIes
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 significant energy savings, minimizing the flow demand from
the primary side and reducing the return temperature.
Versions and product codes
Heating side
Product code Type
power
Heating and DHW
GE556Y401 26 kW
production
Heating and DHW
GE556Y402 26 kW
production
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-off 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
"flow disturbance elements" and provided for by the EN 1434 for null
rectilinear section upstream and downstream of the meter, such as the
GE552Y122.
047U53918
GE556Y401 / GE556Y402
DHW heat exchanger Template
rated power with valves
58 kW GE551Y074
67 kW GE551Y074
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 filter 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-certified 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 differential 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 flow rate on primary circuit: 1070 l/h @ 75 °C for 58 kW
Warning.
The HIU can be used in closed boiler rooms for operation with non-
aggressive fluids (water, glycol-based water in compliance with VDI
2035/ÖNORM 5195).
1150 l/h @ 75 °C for 67 kW
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