Viessmann Cylinder demand terminal box Installation Instructions For Contractors page 3

Electrical connections
G
H
A Terminals in the control unit
B Cylinder demand terminal box
C Cylinder thermostat
D High limit safety cut-out
E Valve
1. Remove cover of terminal box B.
2. Make on-site wiring to X4.1 and X4.2
in terminal box B according to the
connection diagram.
Apply the strain relief to the cable.
A
F
5
B
F Room thermostat (clock thermo-
stat)
G Terminal box (on site)
H Power supply 230 V, 50 Hz
3. Refit cover of terminal box B.
C
D
E
3