Vitotronic 300, GW2B Installation and Service
5693 982 - 04
84
Heating Circuit Control
(continued)
Control sequence
Mixing valve circuit
The mixing valve motor will not be controlled within the
“neutral zone” (±1 K).
Supply temperature drops
(Set value
−
1 K)
The mixing valve motor receives the signal “Mixing valve
open”. The signal duration lengthens with an increasing
control differential.
The duration of pauses reduces with an increasing control
differential.
Supply temperature rises
(Set value +1 K)
The mixing valve motor receives the signal “Mixing valve
closed”. The signal duration lengthens with an increasing
control differential.
The duration of pauses reduces with an increasing control
differential.
Function Description
Legend
A
Start of operation with standard room temperature
B
Set boiler water or supply temperature in accordance
with the selected heating curve
C
Set boiler water or supply temperature in accordance
with coding address “FA”:
122°F (50°C) + 20% = 146°F (60°C)
D
Duration of operation with raised set boiler water
or supply temperature in accordance with coding
address
“Fb”:
60
min
Example using the settings in the factory set condition
Set boiler water or Supply temperature
Time in h
