4 213 321 V01 KDT RegelModul Solar EN.docx
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0
80
60
40
20
100
Charging free
Starting aid
TKOmin off
TKOload
TKOmin
nPS1
TKO
PS1 on
TxU
ΔT 5K
Waiting
period
ΔT 5K
ΔT 10K
DIFF on (08-001)
12.5. Collector starting aid
The parameter (08-015) enables activation of a starting aid for the collector circuit. The starting aid involves
recirculation of the collector fields with minimum speed (08-035) by collector circuit pump PS1 so as to obtain
a meaningful reference temperature on the collector sensor TKOx.
As a result of a positive temperature change at the collector sensor and exceeding the collector minimum
temperature (08-012), the solar pump is started for a definable switch-on duration (08-017) at minimum speed
(08-035).
When the time has expired, the temperature at the collector TKOx is measured. If there is a sufficient temperature
difference in relation to the consumer, collector temperature TKOx is greater than consumer temperature TUx
plus switch-on difference Diffon (08-001), the solar pump remains operating.
If the switch-on criterion is not met, the collector temperature is set as a new reference point for the next start,
and a variable waiting time is calculated. Depending on the difference from the last collector temperature or the
temperature change during the time when the pump was switched on, the calculated waiting time will be between
15 and 100 minutes.
PS1 = ON, if TKO > TKOmin and TKO > TKOload & waiting time < 15 min
-> Pump for (08-017) active with minimum speed (08-035)
-> After timer expires, value (08-017)
PS1 OFF, if TKO < TKOmin
– 5 K or TKO < TxU + DIFFoff (08-002) or
PS ON, if TKO > TxU + DIFFon (08-001)
