Datasheet

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3.1 Application example 6
Application example 6 - Single boiler system with Vitogas 100 boiler and two heating
circuits with mixer plus shunt pump for raising the return temperature
System:
Single boiler system with
H Vitogas 100 (72 to 144 kW)
H Vitotronic 300 (type GW2)
or
Vitotronic 100 (type GC1) with
Vitocontrol control panel and integrated
weather-compensated Vitotronic 333
(type MW1S) control unit
or
Vitotronic 100 (type KC2) and external,
weather-compensated control unit (for
connections, see page 42)
H Shunt pump
Possible applications:
Heating systems with distributor installed
close to the boiler. The boiler water
volume flow must be able to be reduced.
Function description:
The temperature sensor T2 or the limit
thermostat T2 activates the shunt pump, if
the actual temperature falls below the
required minimum return temperature. If
the minimum return temperature is not
reached, even if the return temperature is
raised, the volume flow must be reduced
by at least 50 % via the temperature
sensor T1 or the limit thermostat T1.
Size the shunt pump to approx. 30 % of
the total throughput capacity of the boiler.
If it is not possible to reduce the boiler
water volume flow, e.g. in older systems,
we would recommend the example on
pages 28 and 29.
Advantages:
You will not need any costly boiler circuit
pump or mixing valve to raise the return
temperature.
The boiler receives optimum protection
when using a Vitotronic 300 (type GW2).
No additional on-site protective measures
are required.