Viessmann vitodens Technical Manual page 22

1.2 Specification
Vitotronic 333 cascade control unit for multi-boiler systems
As delivered condition
Vitotronic 333, type MW2
(part no. 7179 063)
with
H Programming unit with plain text
support and illuminated display
H Outside temperature sensor
H Flow temperature sensor
H Cylinder temperature sensor
1
H Cascade communication module
H Mounting bracket
Fit the control unit with a wall mounting
bracket to the wall.
An extension kit is required for each
heating circuit with mixer (accessory).
Only install three way mixers into heating
circuits for condensing boiler because of
their low return temperatures.
Construction and function
Modular construction
The control unit comprises a basic unit,
electronic modules and a programming
unit with plain text support.
The control unit contains the following:
System ON/OFF switch, electronic
maximum temperature limiter, minimum
temperature regulator, emissions test
switch, Optolink laptop interface,
Keys for
H Program selection
H Holiday program
H Party and economy mode
H Temperature at reduced mode
H Domestic hot water temperature
H Date/time
H Setting the heating curves for
system/flow temperature
H Heating circuit selection
and a rotary selector for temperature
selection in standard mode.
Demand-dependent heating circuit pump
shutdown, adjustment of the variable
heating limit, anti-seizing pump
protection, central fault message and
integral diagnostic system.
22
The LON communication module and
BUS terminators are available as
accessories to enable communication.
For systems with DHW cylinder
H circulation pump with check valve for
cylinder temperature control
or
H cylinder loading system Vitotrans 222
with mixer assembly
must be ordered separately.
Functions
Vitotronic 333 regulates the system/flow
temperature of a multi-boiler system with
up to four Vitodens 300 with
Vitotronic 100, type HC1, in modulating
mode.
It regulates the system/boiler water
temperature and the flow temperature of
the heating circuits with mixer subject to
weather conditions.
It controls the Vitotronic 100, type HC1, of
the boilers, in accordance with boiler
sequence strategy.
It provides adaptive cylinder temperature
control with priority.
An additional DHW heating function
(heating to a higher temperature) is an
available option.
A cylinder loading system with a
regulated three way valve can be
controlled.
Optional screed drying function for
underfloor heating systems.
According to the Energy Savings Order
[Germany], the temperature in each room
must be individually controlled, e.g.
through thermostatic radiator valves.
Control characteristics
H PI characteristics with three-point output
H Heating curve setting range
Slope: 0.2 to 3.5
Level: 13 to 40 K
Max. limit: 20 to 130 ºC
Min. limit: 1 to 127 ºC
Differential temperature
for heating circuits
with mixer: 0 to 40 K
H DHW temperature setting range:
10 to 60 ºC; adjustable from 10 to 95 ºC
(potential temperature limited by the
max. boiler flow temperature)
Heating system with underfloor heating
In an underfloor heating circuit, an
extension kit is required for one heating
circuit with mixer.
Install a temperature limiter into the
underfloor heating circuit to limit the
maximum temperature.
Observe DIN 18560 2.
A remote control with room temperature
hook-up must not affect the underfloor
heating circuit.
Plastic pipe systems for radiators
We recommend the installation of a high
limit thermostat to limit the maximum
temperature for plastic pipework for
heating circuits with radiators.
Specification
Rated voltage: 230 V~
Rated frequency: 50 Hz
Rated current: 6 A
Power consumption: 10 W
Safety class: I
Protection: IP 20 D to
EN 60 529,
safeguard through
design/installation
Function: Type 1 B to
EN 60 730 1
Permissible ambient
temperature
H during operation: 0 to +40 ºC
Installation in living
accommodation
(standard ambient
conditions)
H during storage
and transport: 20 to +65 ºC
Rated breaking capacity
of the relay outputs for
H Heating circuit pumps
or heat exchanger
set sÖ: 4 (2) A 230 V~
H Cylinder loading
pump sA: 4 (2) A 230 V~
H DHW circulation
pump sK: 4 (2) A 230 V~
H Central fault
message gÖ: 4 (2) A 230 V~
H Three way valve
cylinder loading system
or
mixer motor gS: 0.2 (0.1) A 230 V~
*1
Total max. 6 A 230 V~.
VITODENS
*1
*1
*1
*1
*1