The high limit safety cut-out settings and other settings depend on the
system equipment level and the safety equipment to EN 12828 or
EN 12953.
High limit safety cut-out 110 °C 100 °C
Temperature controller 100 °C 87 °C
Coding address "06" for electronic maxi-
mum temperature limit (Vitotronic 100)
95 °C 85 °C
Maximum temperature of the on-site con-
trol unit
90 °C 80 °C
Note
A safety temperature of 120 °C (EN12953) is only permissible with an
additional, self-monitoring high limit safety cut-out. For an accessory
pack for safety temperature 120 ºC, see Viessmann pricelist.
Operation with a modulating burner
A
Plug to the control unit
B
Enable boiler
Butterfly valve "open" or "closed"
C
Burner stage 1 (base load) "ON"
D
Reduce burner output (modulation controller)
E
Raise burner output (modulation controller)
F
Plug to the burner
Colour coding to DIN IEC 60757
BK black
BN brown
BU blue
The connections on plugs aVD and aVH are required when connecting
an external control unit. The cylinder temperature and the load-
dependent cascade control must be controlled by an external control
unit.
Note
An "enable boiler" contact is essential for multi-boiler systems.
This contact must always be closed on the lead boiler.
External burner start – burner stage 1
Contact at terminals 1 and 2 of plug
aVD
■ Contact closed:
Burner stage 1 is switched on.
The modulation (full load) is switched on only for maintaining the
minimum temperature.
The boiler water temperature is limited by the electronic maximum
temperature limiter (see the Vitotronic 100 service instructions), if it
is set below that of the mechanical thermostat "
R
".
■ Contact open:
Burner stage 1 is switched off.
Modulating burner connection:
■
Burner stage 1 fA of the Vitotronic 100
■
Plug lÖ from the Vitotronic 100 via modulation controller (on-site) to
plug
lÖ
on the burner.
■ Set the minimum temperature at the higher control unit with the
modulation controller 5 K higher than the lower boiler water temper-
ature; see operating conditions.
Enable boiler, butterfly valve
Contact at terminals 2 and 3 of plug
aVH
■ Contact closed:
Initially, the preheat function for lag boilers is activated.
After the preheat function has expired, the minimum boiler water
temperature will be maintained and the burner stages can be con-
trolled externally.
■ Contact open:
The butterfly valve is closed after approx. 5 min.
Burner stages cannot be switched ON externally; a minimum tem-
perature will not be maintained.
Adjustments at the Vitotronic 100
Code "01:3".
The high limit safety cut-out settings and other settings depend on the
system equipment level and the safety equipment to EN 12828 or
EN 12953.
High limit safety cut-out 110 °C 100 °C
Temperature controller 100 °C 87 °C
Coding address "06" for electronic maxi-
mum temperature limit (Vitotronic 100)
95 °C 85 °C
Maximum temperature of the on-site con-
trol unit
90 °C 80 °C
Note
A safety temperature of 120 °C (EN12953) is only permissible with an
additional, self-monitoring high limit safety cut-out. For an accessory
pack for safety temperature 120 ºC, see Viessmann pricelist.
Hook-up of on-site control equipment via LON
The Vitotronic control units are equipped with an open standard inter-
face "LON" (Local Operating Network).
This universal, decentralised network for automated building control
systems not only allows communication between Vitotronic control
units, but also the hook-up of on-site systems and devices from various
manufacturers.
Control units
(cont.)
74
VIESMANN
OIL/GAS BOILERS
11
5822 426 GB
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