Viessmann VITOCAL 200-G, Installation And Service Instructions Manual

Page: 76 / 208

HR Heating water return
(Multi-connect system)
HV Heating water flow
(Multi-connect system)
!
Please note
With underfloor heating cir-
cuits , there is a risk of building
damage through the screed
overheating if the control unit
fails.
Equip
underfloor heating cir-
cuits with a temperature lim-
iter.
1. Thoroughly flush the heating sys-
tem (particularly when connecting
to an existing system) and connect
the heating water flow and return in
accordance with the adjacent dia-
gram.
2. Carry out a leak/tightness test.
Operating pressure: 3 bar
Max. test pressure: 4 bar
Making the electrical connections to external components
Note
The unit's external electrical connec-
tions are located together on the con-
trol panel in the top r.h. area of the
unit (see X60 on
B
in illustration on
page 54).
Sensor connections
With the exception of the outside tem-
perature sensor, we recommend the
use of screened cable (e.g. J-Y(St)Y,
2 x 0.8 mm, max. 10 m long). Note
Never run LV cables immediately next
to 230/400 V cables.
For cable runs
> 10 m, use a larger
cross-section or terminate several
cores together.
Connecting the heating circuits
76
Installation sequence
55
92
968
GB