Viessmann SCU345, Manual

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22
en-US/C
A
The controller compares the temperature at sensor
S1 to the temperatures at sensors S2, S4 and S5. If the
measured temperature differences are higher than the
adjusted switch-on temperature differences, the pump (R1, R2 and/or R3) will be activated and the corre-
sponding tank will be loaded up to the adjusted maxi-
mum temperature at most. Priority loading or parallel
loading can be carried out in this system.
System 6
3-tank solar system with pump logic and priority logic
Sensor/
terminal
Designation Description
S1 TCOL Temperature collector
S2 TST1B Temperature tank 1 bottom
S3 Optional sensor for measure-
ment purposes or options
S4 TST2B Temperature tank 2 bottom
S5 TST3B Temperature tank 3 bottom
V40 Optional sensor for measure-
ment purposes or options
Relay Description
R1 Solar pump tank 1
R2 Solar pump tank 2
R3 Solar pump tank 3
R4 optional:
Thermal disinfection
Parallel relay
Heat dump