Viessmann SCU345 Manual page 45

Loading tank 2 and tank 3
LOAD2 (3)/ LST2 (3)
Loading tank 2, 3
Selection: ON / OFF
Factory setting: ON
In a multi-tank system, the second tank or the third
tank can be switched off for loading by means of the
parameter LST2 or LST3 respectively.
If the parameter is set to OFF, the system runs like a
2-tank, or a 1-tank system respectively. The represen-
tation in the display remains the same.
Pump control
PUMP / PUMP1 (2, 3,)
Pump control
Selection: OnOF, Puls, ADAP
Factory setting: OnOF
With this parameter, the pump control type can be
adjusted. The following types can be selected:
Adjustment for standard pump without speed control:
• OnOF : Pump on / pump off
Adjustment for a standard pump with speed control:
• PULS : Burst control via semiconductor relay
Adjustment for a high-effi ciency pump (HE pump)
with speed control via adapter:
• ADAP : Pump on / pump off; the corresponding
relay (R1 ... 3) remains switched on for
one hour after the switch-off condition
has been fulfi lled.
Speed control can be carried out via an
adapter, e. g. the VBus ® / PWM interface
adapter.
Note
With the factory setting, speed control is
not possible.
Note
For more information about connecting HE
pumps, see page 34.
Minimum speed
PUMP1 (2, 3) / n1 (2, 3) LO
Speed control
Adjustment range: 30 ... 100 %;
20 ... 100 % if ADAP is adjusted
in steps of 5%
Factory setting: 30 %
In the adjustment channel n1(2, 3)LO, a relative mini-
mum speed for connected pumps can be allocated to
the outputs R1, R2 and R3.
Note
When loads which are not speed-controlled
(e. g. valves) are used, the value of the cor-
responding relay (n1, n2, n3) must be set to
100% or the pump control type must be set
to OnOF in order to deactivate pump speed
control.
Maximum speed
PUMP1 (2, 3) / n1 (2, 3) HI
Speed control
Adjustment range: 30 ... 100 %;
20 ... 100 % if ADAP is adjusted
in steps of 5%
Factory setting: 100 %
In the adjustment channel n1(2, 3)HI, a relative maxi-
mum speed for connected pumps can be allocated to
the outputs R1, R2 and R3.
Note
When loads which are not speed-controlled
(e. g. valves) are used, the value of the cor-
responding relay (n1, n2, n3) must be set to
100% or the pump control type must be set
to OnOF in order to deactivate pump speed
control.
45