Viessmann VITODENS 343-F WS4A Installation And Service Instructions Manual page 62

Commissioning, inspection, maintenance
Further details regarding the individual steps
T control unit DO/DF
Delivered condition: DO 6.0
Setting Description
range
DO 1.5 The control unit determines the differential between the collector
DO 10.0 temperature and the cylinder temperature and compares these
with the selected starting temperature differential "DO". The solar
DF 1.0 DF
circuit pump is switched ON when this value is exceeded. The
9.5
solar circuit pump is switched OFF if the actual temperature falls
below the selected stopping temperature differential "DF".
Note
DO can be set a minimum of 0.5 K higher than DF and DF a maxi-
mum of 0.5 K below DO.
Maximum cylinder temperature SX
Delivered condition: SX 60.0
Setting Description
range
SX 2.0 SX This prevents a further heating of the cylinder when the selected
90.0 value is exceeded.
At the factory, the maximum cylinder temperature is enabled by
FN = 1.
Collector limit temperature CL
Delivered condition: CL 140.0
Setting Description
range
CL 110.0 The solar circuit pump is switched OFF to protect the solar com-
CL 200.0 ponents when this temperature is exceeded.
62
6 °C; DF 4.0 4 °C
60 °C
140 °C
(cont.)