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20 INSTALLATION DIAGRAMS
System 1 - SOLAR HEATING WITH 1 STORAGE CYLINDER
The controller calculates the temperature differential between
collector sensor S1 and storage cylinder sensor S2. If the differ-
ential exceeds or is equal to the set activation temperature dif-
ferential (DT O), relay 1 activates the solar pump and the storage
cylinder is charged until the deactivation temperature differen-
tial (DT F) or maximum storage cylinder temperature (S MX) is
reached.
Optionally, sensors S3 and S4 can be used for metering purposes.
Sensor S3 can be used as a reference sensor for the storage cyl-
inder safety deactivation function (OSEM).
If the thermal energy metering function (OHQM) is activated,
sensors S4 and VFD can be used as flow and return sensors.
R1
S4/VFD/TRIT
If the drainback function (ODB) is activated, relay 2 can be used
to activate the booster pump. The booster function (OBST) must
be activated for this purpose.
Example of a drainback system (with booster pump)
R1
R2
PWM
VFD
S1
S4/VFD/TMAN
S1
S3
S2
VBus
9 10
S3/TSS
S2
Relay out-
Control differential
puts
R1
Sensor-input
S1
S2
S3
S4/VFD
Fig. 2
29
Notes
DT (S1-S2)
Solar pump (P1)
Description
Collector temperature
Storage cylinder bottom temperature
Storage cylinder top temperature
(optional, view-only)
Collector flow/return temperature
(optional, view-only)
Fig. 1
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