10
en-US/C
A
The controller compares the temperature at sensor
S1 to the temperatures at sensors S2 and S4. If the
measured temperature differences are higher than
the adjusted switch-on temperature differences, the
pump (R1) will be activated and the corresponding
tank will be loaded up to the adjusted maximum
temperature via the valve (R3). Tank 1 is loaded with
priority. Heat exchange from tank 2 to tank 1 (R2) is
possible with another temperature differential func-
tion (S3-heat sink / S5-heat source).
System 2
2-tank solar system with valve logic and heat exchange control
Note: 3-port valve normally open - tank 1 (S2)
Sensor/
terminal
Designation
Description
S1
TCOL
Temperature collector
S2
TST1B
Temperature tank 1 bottom
S3
TST1T
Temperature tank 1 top
S4
TST2B
Temperature tank 2 bottom
S5
TST2T
Temperature tank 2 top
V40
optional: flowmeter
Relay
Description
R1
Solar pump
R2
Heat exchange pump
R3
3-port valve tank 1/2
R4
optional:
Thermal disinfection
Parallel relay
Heat dump
Содержание SCU345
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