Opening The Nc-Box; Hydraulic Connection; Preparation For Retrofitting - Viessmann NC-Box Installation And Service Instructions For Contractors

Installation sequence

Opening the NC-Box

1.
Fig.3
Note
Should there be insufficient space for working, front
casing part can also be removed. First, remove
B
casing cover and pull out the panel with cable
D
entries .
E
Terminal box
A
Front casing part
B

Hydraulic connection

To prevent corrosion damage, provide all hydraulic
pipes with thermal insulation as vapour diffusion-proof
installation (on the brine and cold water sides) in
accordance with current engineering standards.

Preparation for retrofitting

1. Close ball valves and sliders.
8
2.
1.
Power cable, heat pump connecting cables (NC
C
signal) and contact humidistat (connected at the
factory)
Casing cover
D
Panel with cable entries and strain relief fittings
E
2. Open the primary circuit (brine) and the secondary
circuit (heating water) at a suitable position and
drain the heat transfer medium.