System Layout 9 - Viessmann SCU224 User Manual

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
S1
R1
Display Channels
Channel Description
INIT x* ODB initialization active
x*
FLL ODB filling time active
STAB x* ODB stabilization in progress
COL x Temperature collector
TSTB x Temperature tank 1 bottom
TSTT x Temperature tank 1 at the top
TRET x Temperature heating circuit
n % x Pump speed relay
hP1 x Operating hours R1
hP2 x Operating hours R2
TIME x Time
28
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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.
S3
S2
S4
R2
Terminal
-
-
-
S1
S2
S3
S4
R1
R1
R2
-
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