System Layout 4 - Viessmann SCU224 User Manual

SCU224

System layout 4

The controller calculates the temperature differences
between collector sensor S1 and tank sensors S2 and S3. If
the differences are larger than or identical to the adjusted
switch-on temperature differences (DT1O / DT2O), the
solar pump will be operated by relay 1, and the respective
tank zone will be loaded until the switch-off temperature
differences (DT1F / DT2F) or the maximum tank tempera-
Arr 4
S1
R1
R2
S4 / TR
Display Channels
Channel Description
COL x Temperature collector
TSTB x Temperature tank 1 bottom
TSTT x Temperature tank 1 at the top
S4 x Temperature sensor 4
TR x* Temperature return sensor
n % x Pump speed relay
hP1 x Operating hours R1
hP2 x Operating hours R2
x*
kWh Heat quantity kWh
MWh x* Heat quantity MWh
TIME x Time
16
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tures (S1MX / S2MX) are reached. The priority logic causes
priority loading of the upper zone of the tank, if possible.
The 3-way-valve will be operated by relay 2 then.
Sensor S4 can optionally be connected for measurement
purposes.
If energy metering (OHQM) is activated, sensor S4 has to
be connected as return sensor.
S3
S2
Terminal Page
S1 37
S2 37
S3 37
S4 37
S4 37
R1 38
R1 38
R2 38
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