Delivered Condition - Viessmann Vitodens 200 Technical Manual

1.2 Specification
Vitotronic 333 cascade control unit for multi-boiler systems
Vitotronic 333 cascade control unit, type MW2, for the Vitodens 300 from 49 kW output with the Vitotronic 100
Weather-compensated, digital cascade and heating circuit control unit
H for multi-boiler systems with up to four
Vitodens 300 boilers
H with sequential boiler strategy
H for one system circuit and a max. of
two heating circuits with mixer. Up to a
further 32 Vitotronic 050 heating circuit
controllers can be connected via the
1
LON BUS (LON module required;
accessories)
H for modulating operation in conjunction
with the Vitotronic 100, type HC1

Delivered condition

Vitotronic 333, type MW2
(part no. 7179 063)
with
H Programming unit with illuminated
plain text display
H Outside temperature sensor
H Flow temperature sensor
H Cylinder temperature sensor
H Cascade communication module
H Mounting panel
The control unit is fitted to the wall with a
mounting panel.
An extension kit (accessories) is required
for each heating circuit with mixer.
Because of the low return temperatures
associated with condensing boilers,
install only three-way mixers in the
heating circuits.
28
H with cylinder temperature control or
control unit of a cylinder primary
system with mixer assembly
H with capability to communicate via LON
BUS (LON communication module and
terminators are available as an
accessory)
H with integral diagnostics system.
The LON communication module and BUS
terminators are available as accessories to
enable communication.
For systems with a DHW cylinder, the
H cylinder primary pump with check valve
for regulating the cylinder temperature
or
H the Vitotrans 222 cylinder primary
system with mixer assembly
should be ordered separately.
Note
For higher anti-interference, connect all
boilers with the Vitotronic 100 and the
Vitotronic 333 cascade control unit to the
same phase.
Heating systems with underfloor heating
An extension kit for one heating circuit
with mixer is required for the underfloor
heating circuit with mixer.
Install a temperature limiter into the
underfloor heating circuit to limit the
maximum temperature. Observe
DIN 18560 2.
The underfloor heating circuit should not
be regulated by a remote control with
room temperature hook-up.
Plastic pipe systems for radiators
We also recommend the installation of a
temperature limiter to restrict the
maximum temperature for plastic
pipework in heating circuits with
radiators.
VITODENS