Additional Functions For Multi Boiler Systems With Vitotronic 300-K, Type Mw1B Or Vitotronic 100, Type Gc1B Or Gc4B Via Lon - Viessmann VITOCROSSAL 200 Type CM2 Technical Manual

Control units
(cont.)
[{{] 0-10V aBJ
+ - S P Ö
9
­
U
+
The 0 - 10 V hook-up provides an additional set boiler water temper-
ature:
0 - 1 V is taken as "no default for set boiler water temperature".
≙ Set value 10 °C
1 V
≙ Set value 100 °C
10 V
The set default range can be changed in code 1E:
≙ Set value 30 °C
1 V
10 V ≙ Set value 120 °C
Note
Ensure DC separation between the negative pole and the earth con-
ductor of the on-site voltage source.
Additional functions for multi boiler systems with Vitotronic 300-K, type MW1B or Vitotronic 100, type GC1B
or GC4B via LON
Plugs aVD and aVH at the Vitotronic 300-K
1 2 3 1 2 3
143 146
A External heating program changeover/mixer "open"
B External blocking/mixer "closed"
C External demand
A, B and C are floating contacts.
External heating program changeover/mixer "open"
Closing contact A can change the manually selected heating pro-
gram or open the connected mixers.
In coding address "9A", the external function mixer "open" can be allo-
cated to the individual heating circuits.
In coding address "91", the external heating program changeover can
be allocated to the heating circuits.
VIESMANN
90
f-] fÖ
A
L N N L
A
B
C
Digital data inputs DE1 to DE3
Functions:
■ External changeover of the operating status, separate for heating
circuits 1 to 3
■ External blocking with fault message input
■ Fault message input
■ Brief operation of the DHW circulation pump
The hooked-up contacts must correspond to safety category II.
Input function assignment
Select the input functions via the codes on the boiler control unit:
■ DE1: Coding address "5d"
■ DE2: Coding address "5E"
■ DE3: Coding address "5F"
Set flow temperature for external demand
■ The set flow temperature can be selected with code 9b.
Output aBJ
Connections:
■ Switching a feed pump to a substation
■ Signalling reduced mode for a heating circuit
Function assignment
Select the function of output aBJ via coding address "5C".
Heating programs
Symbol Explanation
Central heating OFF and DHW OFF
9
Central heating OFF and DHW ON
w
Central heating ON and DHW ON
rw
Subject to the setting of coding address "d5", the system can be
switched over from all three manually adjustable heating programs 9,
w and rw (contact open), to either 9 or rw (contact closed).
External blocking/mixer "closed"
Closing contact B causes the burner to shut down or the mixer to be
closed.
In coding address "99" you select which heating circuits are affected
by the function external blocking or mixer "close".
Note
The frost protection of the relevant boiler or heating circuit is no longer
effective during the controlled shutdown or when the mixer "Closes",
The lower boiler water temperature or flow temperature will no longer
be maintained.
External demand
Closing contact C starts the burner or boiler subject to load.
The boiler water temperature is limited via the maximum set boiler
water temperature or via the mechanical control thermostat.
The set value is selected in coding address "9b".
Gas condensing boilers