Viessmann SCU345 Manual page 50

Tank set option
LLOGI / OSTS
Tank set option
Selection: ON / OFF
Factory setting: OFF
LLOGI / TST1
Set temperature tank 1
Adjustment range: 4 ... 85 °C [38 ... 184 °F]
in steps of 1 °C [2 °F]
Factory setting: 45 °C [110 °F]
LLOGI / TST2
Set temperature tank 2
Adjustment range: 4 ... 85 °C [38 ... 184 °F]
in steps of 1 °C [2 °F]
Factory setting: 45 °C [110 °F]
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LLOGI / TST3
Set temperature tank 3
Adjustment range: 4 ... 85 °C [38 ... 184 °F]
in steps of 1 °C [2 °F]
Factory setting: 45 °C [110 °F]
Additionally, the following options can be activated:
Tank set option OSTS: With this function, a set
temperature can be adjusted for each tank.
If the selected priority tank reaches its set tempera-
ture, the subordinate tanks will be loaded successively
up to their set temperatures. After that, the priority
tank is loaded up to its maximum temperature, then
tank 2 and then tank 3.
Spreaded loading option
(only in ARR 3, 4, 6 with differing priority)
LLOGI / PRIO / OSE
Spreaded loading option
Selection: ON / OFF
Factory setting: OFF
Spreaded loading option OSE: In 2- and 3-tank
systems with 2 or 3 pumps, a spreaded loading option
can be activated:
As soon as the adjustable spread difference DTSE
between the collector and the reference tank is
reached, the absorption tank will be loaded in parallel
unless it is blocked. If the temperature difference falls
by 2 K [4 °Ra] below DTSE, the absorption tank will
no longer be loaded.
LLOGI / PRIO / DTSE
Temperature diff. spreaded loading
Adjustment range: 20 ... 90 K [40 ... 160 °Ra]
in steps of 1 K [2 °Ra]
Factory setting: 40 K [70 °Ra]
LLOGI / PRIO / SLSTR
Reference tank
Adjustment range: 1, 2, 3
Factory setting: 1
LLOGI / PRIO / SLSTA
Absorption tank
Adjustment range: 1, 2, 3
Factory setting: 2