GE556-1 Heat interface unit with double heat-exchanger

Heat Interface Unit (HIU) with double heat exchanger, for centralized systems for high and low temperature heating and domestic hot water production.
- Heat exchanger for the instantaneous production of domestic hot water (only for GE556Y186/187).
- Self-regulating circulator (ErP 2009/125/EC), expansion tank, safety valve, pressure gauge, pressure switch, air vent valve on heating/cooling side
- Thermostatic control of the heating temperature with the possibility of high and low temperature (only for GE556Y186/187).
- Motorized zone valve, on heating/cooling side
- Priority control in the production of domestic hot water (only for GE556Y186/187).
- TMV2+TMV3+WRAS-certified anti-scalding thermostatic mixer (only for GE556Y186/187).
- Dynamic balancing valve, air vent valve and adjustable by-pass on primary side (except for the by-pass, there is no primary flow when the satellite is not active)
- Connections with adjustable tail pieces to facilitate installation.
- Pre-arrangement for housing the HIU inside a metallic template fitted with shut-off valves.
- Pre-arrangement for installation of thermal energy meter and domestic water meters.
- Box with terminal board for electric connections
- Max. working temperature: 90 °C.
- Max. working pressure:
primary circuit 16 bar
DHW secondary circuit: 10 bar
heating/cooling secondary circuit: 3 bar

Dimensions (L x H x W) and notes:
- GE556Y181: 450 x 700 x 180 mm
Only for heating (17,4 kW)
- GE556Y184: 450 x 700 x 180 mm
Only for cooling (5 kW)
- GE556Y186: 450 x 700 x 180 mm
Heating (17,4 kW) and DWH production (56 kW)
- GE556Y186: 450 x 700 x 180 mm
Heating (17,4 kW) and DWH production (67 kW)

To complete the GE556-1 HIU, the following may be ordered separately:
- Thermal energy meter, GE552 series
- Domestic water meter, GE552-2 series
- Template for installation in worksite, GE551-2 series
- Components for M-Bus data centralization (GE552-4 series),
or Wireless M-Bus data centralization (GE552-W series)

Technical documentation GE556Y181,GE556Y184,GE556Y186-187