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SCU224

System layout 9

The controller calculates the temperature difference bet-

ween collector sensor S1 and tank sensor S2. If the diffe-

rence is larger than or identical to the adjusted switch-on

temperature difference (DT O), the solar pump will be

operated by relay 1, and the tank will be loaded until the

switch-off temperature difference (DT F) or the maximum

tank temperature (S MX) is reached.

Arr 9

Display Channels

Channel Description Terminal Page

INIT

ODB initialization active - 37

FLL

ODB ﬁlling time active - 37

STAB

ODB stabilization in progress - 37

COL x Temperature collector S1 37

TSTB x Temperature tank 1 bottom S2 37

TSTT x Temperature tank 1 at the top S3 37

TRET x Temperature heating circuit S4 38

n % x Pump speed relay R1 38

hP1 x Operating hours R1 R1 38

hP2 x Operating hours R2 R2 38

TIME x Time - 34

A heating circuit return preheating will be operated by

relay 2, if the temperature difference between sensors S3

and S4 is larger than or identical to the adjusted switch-on

temperature difference (DT3O). For this purpose, relay 2

will operate the 3-way-valve.

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Viessmann SCU224 Wartungshandbuch Seite 28