Technical data
11
Heating system designs
System version 2
(continued)
Codings 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
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
4b: 1 Connecting the T2 temperature sensor to plug aJB
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
Heating systems with distribution manifold installed close to the boiler. The boiler water volume flow will be reduced via the
motorized isolation valve.
Temperature sensor T2 activates the shunt pump if the required minimum return temperature is not reached. If this fails to
achieve the required minimum return temperature, the boiler water volume flow must be reduced by at least 50% via
temperature sensor T1, via the isolation valve or the heating circuit control units. Where the T1 temperature sensor cannot
affect the motorized isolation valves, it must, instead, regulate the mixing valves of the heating circuits downstream.
Size the shunt pump to approx. 30% of the total throughput capacity of the boiler.
The boiler receives optimum protection when controlling the heating circuits via Vitocontrol-S, VD2/CT3/CM2 or a
Vitotronic 050 connected to the boiler control unit. No additional on-site protective measures are required.
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