Viessmann NC-Box - Required Connections; Heating;Cooling Circuit Connections; Separate Cooling Circuit Connections

9
Required connections
Subject to the type of cooling circuit, the NC-Box can
be connected to the heat pump in two different ways.
Heating/cooling circuit, e.g. underfloor heating
Required hydraulic connection between the NC-Box
and heat pump:
■
Primary circuit flow
■
Secondary circuit flow and return
Separate cooling circuit, e.g. fan convector
Required hydraulic connection between the NC-Box
and heat pump:
■
Primary circuit flow
For this, note the following:
■
Seal the secondary circuit connector on the NC-Box.
■
Connect the secondary circuit flow and return directly
on the heat pump.
■
Equip a separate cooling circuit with a dedicated
expansion vessel and a safety valve (2.5 bar/
0.25 MPa).
Installation sequence
Hydraulic connection (cont.)
5675 869 GB
Installation