Grundfos TPE2 - Temperature Influence

0
1
2
3
4
5
6
7
Dl4
SP
a
SP7
SP6
SP5
SP4
SP3
SP2
SP1
SP
n
Stop
Dl3
Dl2
TM064269
Principle sketch showing how predefined setpoints
function
Pos. Description
SP Set point
DI Digital input
SP
a
Actual set point
SP
n
Normal set point
If all digital inputs are open, the pump either stops or
runs at the normal setpoint. Set the desired action
with Grundfos GO or with the advanced control panel.
Factory setting
See section Factory settings.
Related information
35. Factory settings
17.21
Temperature influence
Pump variant Temperature influence
TPE3, TPE3 D ●
TPE2, TPE2 D -
When this function is enabled in proportional- or
constant-pressure control mode, the setpoint for head
is reduced according to the liquid temperature.
You can set the temperature influence to function at
liquid temperatures below 80 or 50 °C. These
temperature limits are called T
max
. The setpoint is
reduced in relation to the head set which is equal to
100 % according to the characteristics below.
H
T [°C]
30 %
20 50 80
100 %
H
actual
T
actual
H
Q
176T [°F]
TM057911
Temperature influence
In the above example, T
max.
, which is equal to 80 °C,
has been selected. The actual liquid temperature,
T
actual
, causes the setpoint for head to be reduced
from 100 % to H
actual
.
The temperature influence function requires the
following:
• proportional-pressure or constant-pressure control
mode
• pump installed in flow pipe
• system with flow-pipe temperature control.
Temperature influence is suitable for the following
systems:
• Systems with variable flows, for example two-pipe
heating systems, in which the enabling of the
temperature influence function ensures a further
reduction of the pump performance in periods with
small heating demands and consequently a
reduced flow-pipe temperature.
• Systems with almost constant flows, for example
one-pipe heating systems and underfloor heating
systems, in which variable heating demands
cannot be registered as changes in the head as is
the case with two-pipe heating systems. In such
systems, you can only adjust the pump
performance by enabling the temperature
influence function.
66
English (GB)