Viessmann VITOPLEX 200 Type SX2A Technical Manual page 52

Control units
(cont.)
Vitotronic 100, type GC1
Vitotronic 300- K
11
VIESMANN
52
M M
Electronic boiler control unit
■ For every boiler in a multi-boiler system with the Vitotronic 300-K,
type MW1 (Viessmann cascade control unit, supplied with one
boiler)
or
for every boiler in a multi-boiler system
– with Vitocontrol control panel and integral weather-compensated
cascade control unit Vitotronic 300-K, type MW1S,
or
– with external, weather-compensated cascade control unit with cyl-
inder thermostat
■ For two-stage or modulating burners, if installed
■ With boiler protection function subject to boiler version:
– Therm-Control
– Shunt pump
– Control of a constant return temperature raising facility with a
regulated three-way valve
■ With integral diagnostic system
■ With capability to communicate via LON (LON communication mod-
ule and connecting cables for control unit data exchange are part of
standard delivery)
■ For operation with the Vitotronic 300-K via external contacts:
– Boiler blocking
– Start boiler as the last one in the boiler sequence
■ For operation with external, weather-compensated cascade control
unit:
– Via 0 – 10 V input of the function extension (accessory):
Defaulting an additional set boiler water temperature
and
Enable boiler
or
– Via external contacts:
Enable boiler
and
Switching the burner stages
or
– With capability to communicate via LON (order a LON communi-
cation module separately)
OIL/GAS BOILERS