Technical data

14
Heating system designs
System version 3 (continued)
Possible applications
If the distribution manifold is located in
a remote location (> 20 m / 65 ft). The
heat transfer to the heating circuits
must be able to be reduced.
Temperature sensor T1 reduces or
closes the mixing valves if the required
minimum return temperature is not
achieved. Size the common supply
pump to 110% of the total flow rate of
the heating system.
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.
Temperature sensor T1
Wiring diagram for reducing the volume
flow rate in heating systems with
heating circuit control units, which are
not connected to the boiler control unit
via the LON BUS.
Necessary coding: 0D: 1 and 4C: 2.
sÖA1 Closing mixing valves
(Vitotronic 100, GC1)
A Contactor relay, field supplied
B Downstream heating circuit
control unit
Switching contact closed:
signal for close mixing valve(s)
C Power connection 120 VAC
60 Hz
D Junction box, field supplied
5351 340 v1.4
IMPORTANT