GE556-4

Heat Interface Unit (HIU) with differential pressure control valve

Heat Interface Unit (HIU) for centralized systems, for managing high/low temperature heating and domestic hot water production.
- Heat exchanger for instantaneous production of DHW
- Flow switch for DHW priority control
- Motorized three-way diverting valve
- Self-modulating circulator (ErP 2009/125/EC), only for GE556Y322-323
- Static balancing valve, only for GE556Y320-321
- Thermostatic valve for adjusting the domestic hot water and heating temperature
- By-pass on the domestic primary side to keep the exchanger warm
- Automatic air vent valve with hygroscopic gasket, filter and pressure gauge on the primary side
- Safety pressure switch for low pressure on the primary side, only for GE556Y322-323
- Differential pressure control valve on the primary side
- Safety valve with electrical actuator on the heating side
- Box with terminal board for electric connections
- Brass spacers for installation of thermal energy meter and domestic water meter
- Max. working temperature: 90 °C
- Max. working pressure: 10 bar

- Dimensions and notes:
•GE556Y320: 450 x 630 x 180 mm
High temperature heating and domestic hot water production
Heat exchanger power: 56 kW
•GE556Y321: 450 x 630 x 180 mm
High temperature heating and domestic hot water production
Heat exchanger power: 67 kW
•GE556Y322: 450 x 630 x 180 mm
Low temperature heating and domestic hot water production
Heat exchanger power: 56 kW
•GE556Y323: 450 x 630 x 180 mm
Low temperature heating and domestic hot water production
Heat exchanger power: 67 kW

To complete the GE556-4 HIU, the following may be ordered separately:
- Thermal energy meter, GE552 series
- Domestic water meter, GE552-2 series
- Templates 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)