Adjustment Channels - Viessmann SCU345 Manual

Display of heating period
TDIS
Heating period
Display range:
0:00 ... 23:59 (hh:mm)
If the thermal disinfection option (OTDIS) is activat-
ed and the heating period is in progress, the remaining
time of the heating period is displayed (in hours and
minutes) in this channel, counting backwards.
Display of time
Time
Time
Adjust the current clock time.
The following display channels are only indicated
when the corresponding function is active.
Display ∆T function active
DTFCT
∆T function active
Display thermostat function active
THERM
Thermostat function active
Display of blocking protection time
BLPR1(2, 3, 4)
Blocking protection active
In order to protect the pumps against blocking after
standstill, the controller is equipped with a blocking
protection function. When the blocking protection is
activated, this function switches on the relays one af-
ter another every day at 12:00 a.m. for 10 s at 100 %.
6.2

Adjustment channels

Note
If the controller is commissioned for the
fi rst time, the commissioning menu will
start. Selecting a new system subsequently
will reset all other adjustments to the fac-
tory settings.
Selecting the system
ARR
System
Adjustment range: 1 ... 9
Factory setting: 1
Selection of the appropriate system. Each system
has pre-programmed options and adjustments which
can be activated or changed respectively if necessary.
Select the system fi rst (see chap. 3).
∆T control
LOAD(1, 2, 3) / DT1(2, 3) O
Switch-on temperature diff.
Adjustment range: 1.0 ... 50.0 K [2.0 ... 90.0 °Ra]
in steps of 0.5 K [1.0 °Ra]
Factory setting: 6.0 K [12.0 °Ra]
The controller works as a standard differential con-
troller. If the switch-on difference is reached, the
pump is activated. When the temperature difference
reaches or falls below the adjusted switch-off tem-
perature difference, the respective relay switches off.
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