Technical data

16
Heating system designs
System version 4 (continued)
Coding must be set on every Vitotronic 100, GC1.
Vitotronic 100, GC1
Required coding
01: 2 Multi-boiler system with cascade control via LON BUS
02: 2 Modulating burner operation
*1
03: 1 Oil fired operation (non-reversible)
*1
07: 2
07: 3
07: 4
Setting the boiler number on the Vitotronic of
boiler 2
boiler 3
boiler 4
0C: 1 Constant regulation of the return temperature
4d: 2 Boiler circuit pump on plug sL
77: 2
77: 3
77: 4
Setting the LON participant number on the Vitotronic of
boiler 2
boiler 3
boiler 4
Automatic changeover
4A: 1 Connecting the T1 temperature sensor to plug aJA
Vitocontrol-S, VD2/CT3/CM2
Required coding
00: 3,
00: 4,
00: 7,
or
00: 8
Without system circuit A1
*1
35: 1
35: 2
35: 3
Vitocontrol-S, VD2/CT3/CM2 with
one Vitotronic 100, GC1
two Vitotronic 100, GC1
three Vitotronic 100, GC1
*1
If required.
Possible applications
For example, older heating systems or systems in nurseries and/or systems where downstream heating circuits cannot be
controlled.
Temperature sensor T1 closes the three-way mixing valve in proportion and therefore protects the boiler, if the required
minimum return temperature is not achieved.
Please note:
Size the boiler circuit pump for each boiler so that their volume flow rate is at least as large as the max. total heating circuit
volume flow rate.
Recommendation: 110%
The connection diagram is only a recommendation and needs to be verified for completeness and functionality at the
installation site. Single-phase and three-phase pumps must be connected with field supplied motor contactors and/or motor
starters.
5351 340 v1.4
IMPORTANT