Required Connections - Viessmann NC-Box Installation And Service Instructions For Contractors

Hydraulic connection

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
■
(cont.)
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
9