© Caleffi 11236_iSolar_Plus.mon
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VBus
System layout 4
S2
R1
S3
R2
S1
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-
S4 / TR
Arr 4
Display Channels
Channel
Description
Terminal
Page
COL
x
Temperature collector
S1
37
TSTB
x
Temperature tank 1 bottom
S2
37
TSTT
x
Temperature tank 1 at the top
S3
37
S4
x
Temperature sensor 4
S4
37
TR
x*
Temperature return sensor
S4
37
n %
x
Pump speed relay
R1
38
hP1
x
Operating hours R1
R1
38
hP2
x
Operating hours R2
R2
38
kWh
x*
Heat quantity kWh
-
38
MWh
x*
Heat quantity MWh
-
38
TIME
x
Time
-
34
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.