35
System 3 - STANDARD SOLAR HEATING WITH EXCESS HEAT DISSIPA-
TION
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.
Sensor S3 is used for the thermostat function for supplementary
heating, activated by relay 2, or for excess heat dissipation when
thermostat activation temperature (
AH O
) is reached.
This function can be combined with three adjustable time
bands.
When maximum collector temperature (
CMX
) is reached, relay 1
activates the solar pump and relay 2 activates the 3-way valve
to dissipate excess heat via a heat dissipater. For safety reasons,
excess heat is dissipated only until the temperature in the stor-
age cylinder falls below the fixed safety deactivation tempera-
ture of 95 °C [200 °F].
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.
VBus
PWM
VFD
S1
S2
S4/VFD/TRIT
S4/VFD/TMAN
P1 (R1)
V1 (R2)
S3/TSS
Fig. 4
Relay out-
puts
Control differential
Notes
R1
DT (S1-S2)
Solar pump (P1)
R2
S1 (CMX)
Three-way valve (V1)
Sensor-input
Description
S1
Collector temperature
S2
Storage cylinder bottom temperature
S3
Storage cylinder top temperature
S4/VFD
Collector flow/return temperature
Содержание SUN 1 PLUS 2 RS
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