Connections - Viessmann VITOCAL 222-G Technical Manual

Design information
(cont.)
Information on drinking water filter
According to DIN 1988-2, a drinking water filter should be installed in
systems with metal pipework. We also recommend the installation of
a drinking water filter when using plastic pipes, as per DIN 1988, to
prevent contaminants entering the DHW system.
Safety valve
Protect the DHW cylinder with a safety valve against unduly high pres-
sure.

Connections

Insert the on-site cables from the top through an aperture in the rear
top cover into the equipment (see top view of the equipment on
page 16 and 21). Allow a cable length of 1800 mm for connecting on-
site cables inside the appliance, from the cable entry point to the elec-
trical terminal block.
Vitocal 222-G/333-G
Wiring diagram for system example without solar collectors
VITOCAL
Recommendation: Install the safety valve higher than the top edge of
the cylinder. This protects the valve against contamination, scaling and
high temperatures. The DHW cylinder does not then need to be
drained when working on the safety valve.
Vitocal 242-G/343-G
Wiring diagram for system example with solar collectors
A Compact heat pump
B Outside temperature sensor, sensor lead (2 x 0.75 mm
C Collector circuit pump, power cable (3 x 1.5 mm
D Collector temperature sensor, sensor lead (2 x 0.75 mm
E DHW circulation pump, power cable (3 x 1.5 mm
F Power cable, heat pump control unit (5 x 1.5 mm
OFF contact power cable, zero volt
G For power cable (special tariff/load current), see the following
table
H Supply, instantaneous heating water heater (accessory), power
2
cable (5 x 2.5 mm )
K Electricity meter/mains
L Vitotrol 200 remote control, power cable (2 x 0.75 mm
M Natural cooling switching contact, for controlling the underfloor
heating system with central hook-up, power cable (5 x 1.5 mm
Note
If the equipment level is extended or further accessories are installed,
e.g. heating water buffer cylinder, factor in the additionally required
supply, control and sensor cables.
12
2 )
2
)
2
)
2 )
2 ) with power-
2
)
2 )
VIESMANN
57