Cold Water Connection Scheme; Circulation (Recycle Loop) Connection - DHW VT3131 Bedienungsanleitung

COLD WATER CONNECTION SCHEME:

1: Cold water inlet
2: Ball valve 1": must be open during operation.
3: Contra valve 1": to prevent excessive pressure.
4: Safety valve 1": max. pressure 1 MPa / 10 bar. Discharge pipe connected to safety valve must be installed downwards and
in frost free environment.
5: Drain valve 1": open when the boiler needs to be emptied.
6: Hose connections: for drainage of water from safety valve and drain valve.
7: Drain: connect hoses to safety valve and drain valve and lead the water into drain.
957085-01

CIRCULATION (RECYCLE LOOP) CONNECTION:

We recommend not to use the circulation (recycle loop), because of the important heat losses. This might be the origin of
customer complaints.
If you have to use a recycle loop anyway because of comfort reasons, or building regulations (e.g. "the 3 litre rule") the
piping and the connectors must be dimensioned and insulated carefully. We advise to operate the recycle loop pump
intermittent by means of a timer or a special circulation pump controller, which triggers the pump operation when DHW is
needed and memorizes the user profile. The position of the circulation connector avoids the propagation of scale into the
recycle loop. If required by building regulations, heat loss compensation with self-regulating heating cables is possible.
DHW PRODUCTION:
Your DHW HP can generate DHW with different energy sources, such as HP, electrical heater (built-in), boiler or a solar-
thermic installation. Heating of domestic water can be made using the heat pump, electrical heater and / or boiler. Electrical
heater (built-in), boiler and solar-thermic installation are referred to as supplementary heating. The energy sources are
selected in the menu. They can be selected individually or in combination of 2 sources, but never boiler and electrical heater
together.
The desired set point temperature for DHW can be adjusted by the user in the parameter menu in between 5°C and the
installation specific maximum temperature Tmax (installer setting).
5
6
7
3
2
4
1
10