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4.1.1 Differential-pressure control systems
The control systems which can be selected are:
∆p-v: The electronics increase the pump's differen-
x
tial pressure set value in a straight line between | Hs
and Hs. The differential pressure set value H increa-
ses or decreases in accordance with the transporting
capacity (fig. 8). Basic factory setting.
∆ p-c: The electronics keep the differential pressure
x
generated by the pump above the permissible deli-
very flow range constantly at the set differential
pressure set value Hs up to the maximum characteri-
stic (fig. 9).
∆ p-T: The electronics alter the nominal differential
x
pressure value to be adhered to by the pump depen-
ding on the media temperature measured. This con-
trol system can only be adjusted with the IR monitor
or via LON. There are two possible settings (fig. 10):
Positive control: As the temperature of the flow
x
medium rises, the nominal differential pressure va-
lue is increased linearly between Hs
(setting on IR monitor/LON: Hs
Used e.g. with standard boilers with sliding flow
temperature.
Negative control: As the temperature of the flow
x
medium rises, the nominal differential pressure va-
lue is decreased linearly between Hs
(setting on IR monitor/ LON: Hs
Used e.g. with condensing boilers where a specific
minimum backflow temperature must be maintai-
ned to achieve as high a heat utilisation ratio of the
heating medium as possible. To do this, the pump
must be installed in the system's return flow sec-
tion.
4.1.2 Other energy-saving operating modes
Regulator mode operation: The speed of the pump
x
is kept at a constant speed between nmin and nmax
(fig. 11). The regulator mode deactivates the diffe-
rential pressure control.
In the "auto" operating mode (factory setting) the
x
pump is able to recognize a minimum system heat
output requirement due to a sustained drop in the
flow medium temperature and then switch to
"Autopilot" night setback mode. If the heat output
requirement rises, the pump automatically switches
to standard mode. This setting ensures that the pum-
p's energy consumption is reduced to a minimum and
in most cases is the optimum setting.
The "Autopilot" automatic night set-
ATTENTION!
back mode may only be enabled if
the unit has been hydraulically com-
pensated. If this is not done, under-
supplied unit parts could freeze in
the event of frost.
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32
and Hs
.
min
max
> Hs
).
max
min
and Hs
min
max
< Hs
).
max
min
4.1.3 General pump functions
The pumps are fitted with an electronic overload
x
protection system which switches the pump off
should it become overloaded.
The control module is equipped with a non-volatile
x
memory for data storage. What this means is that
data are stored, even during long periods of down
time. Once the voltage returns the pump starts ope-
rating again with the values set before the power ou-
tage.
The module rating plate is to be found in the termi-
x
nal box. It contains all data necessary for the schedu-
ling the unit.
Pump kick: Pumps switched off by ON/OFF, PLR,
x
LON, IR monitor, Ext.Off, 0...10 V come on every 24
hrs for a short time to prevent blockages during long
periods of inactivity.
If it is likely that the pump will be disconnected from
the supply for long periods, the pump kick should be
taken over by the heating/boiler control system. For
this, the pump must be switched on (display f mo-
tor/module symbol lights up).
Connections to the building management system
(BMS)
SSM: A collective fault signal SSM (potential-free
x
closed contact) can be connected to a control point
(building management system) as standard. The
internal contact is closed if the pump is off-circuit,
there is no problem or failure on the part of the con-
trol module. The faults are described in detail in
chapter 8.1.
IF(Interface) modules (accessory):
x
Optional analog and digital interfaces are available in
the form of add-on IF modules for connecting to ex-
ternal watchdog units (e.g. DDC/BMS) (see also chap-
ter 9).
4.2
Double pump mode
Double pumps or two corresponding single pumps can
be fitted with built-in double-pump management.
Stratos IF module: Two IF modules connected via the
x
DP interface are required for communication bet-
ween pumps. Alongside double pump management,
the IF modules provide other interfaces for the dou-
ble pump, see also chapter 9.
This double pump management has the following
functions:
Master/Slave: Both pumps are controlled by the ma-
x
ster. All settings are made by the master.
Optimum-efficiency peak-load operation: At par-
x
tial load, the hydraulic capacity is provided by one
pump only. The second pump is switched on at opti-
mum efficiency, when the sum of power consump-
tions P
of both pumps is less than the power con-
1
sumptions P
of one pump. Both pumps are then
1
adjusted upwards simultaneously to max. speed if
necessary. In relation to the conventional peak load
operation (load controlled switch on and off) a furt-
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