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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.
9 10
VBus
PWM
VFD
S1
S2
S4/VFD/TRIT
S4/VFD/TMAN
R1
S3/TSS
Fig. 1
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)
S1
R1
R2
S3
S2
Fig. 2
Relay out-
puts
Control differential
Notes
R1
DT (S1-S2)
Solar pump (P1)
Sensor-input
Description
S1
Collector temperature
S2
Storage cylinder bottom temperature
S3
Storage cylinder top temperature
(optional, view-only)
S4/VFD
Collector flow/return temperature
(optional, view-only)
Содержание SUN 1 PLUS 2 RS
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