Bulex Thema Condens AS 48-A, Manual, Page: 77 / 199

MAKSİCONDENSE 48-65
Notes
03/2020 71 T
EKNİK EĞİTİM VE DESTEK
3.3.4.11 Cylinder charging mode with uniSTOR
The units are equipped with two alternative cylinder charging options. Either via a NTC sensor cyl-
inder or a C1/C2 switching contact .
Cylinder charging with cylinder and NTC sensor
The current cylinder temperature is reported to the electronics via the NTC. If the actual value of the
cylinder NTC is
5 K below the target value set on the electronics box, the pump and fan are switched
on and the prioritising diverter valve is moved to the domestic hot water position. The burner is
started after the pump start-up time.
Cylinder charging mode is ended if the cylinder temperature actual value is the same as the target
value. A pump overrun that can be set in the diagnostics system (D.072, default setting = 2 min.)
then occurs.
Cylinder charging can be blocked by the time programme of a weather-compen-
sated control.
The unit output for cylinder charging mode can be set via the DIA system (diagnostics code "D.077")
and can be converted to kW units with whole figures (factory setting: 100% output). The adjustment
range depends on the unit.
Time limit on cylinder charging mode
To avoid long cylinder charging times, e.g. when heating a large cylinder volume, a time limit is
applied to cylinder charging mode because long cylinder charging times can have a negative influ-
ence on the ease of controlling the heating. This "maximum cylinder charging time" can be set to
from 20 to 90 minutes on the display under
D.075 (factory setting: 48 minutes). If the cylinder charg-
ing time exceeds the set value, the cylinder priority switch is overruled for up to 30 minutes (fixed
value) to handle a heat demand. If no heat requirement for heating is received within 30 minutes,
the cylinder is recharged directly if required.
Burner anti-cycling time for cylinder charging
If the cylinder temperature approaches the target value, it can cause the unit to cycle and result in a
longer cylinder charging time, as the energy generated by the boiler can no longer be absorbed by
the cylinder. To reduce this cycle briefly before reaching the set cylinder temperature, a burner anti-
cycling time is effective after the burner shutdown (target flow temperature reached).
─ A heat requirement for heating remains ineffective during the anti-cycling time.
─ The burner anti-cycling time is fixed at 1 min.
─ During the burner anti-cycling time, the prioritising diverter valve remains in the "domestic hot
water" position and the pump continues to operate.