Grundfos MAGNA3 25-80 Installation And Operating Instructions Manual page 44

Setting
1. Select "Temperature influence" with
2. Choose the desired maximum temperature with
press [OK].
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 . The setpoint is reduced in relation to the head set
max.
which is equal to 100 %, according to the characteristics below.
H
100 %
H
actual
30 %
20 50 80
T
actual
Fig. 61 "Temperature influence"
In the above example, T , which is equal to 80 °C, has been
max.
selected. The actual liquid temperature, T
setpoint for head to be reduced from 100 % to H
Requirements
The temperature influence function requires the following:
• proportional-pressure, constant-pressure or constant-curve
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.
Selection of maximum temperature
In systems with a dimensioned flow-pipe temperature:
• Up to and including 55 °C, select a maximum temperature
equal to 50 °C.
• Above 55 °C, select a maximum temperature equal to 80 °C.
You cannot use the temperature influence function in
air-conditioning and cooling systems.
44
or and press [OK].
or and
H
T [°C] Q
, causes the
actual
.
actual
8.7.9 "Bus communication"
Navigation
"Home" > "Settings" > "Bus communication"
This menu offers the following options:
• Pump number
• Forced local mode
• Multipump profile selection
"Pump number"
Navigation
"Home" > "Settings" > "Bus communication" > "Pump number"
Setting
1. Press "OK" to start the setting. The pump allocates a unique
number to the pump.
The unique number enables you to distinguish between the
pumps in connection with bus communication.
"Forced local mode"
Navigation
"Home" > "Settings" > "Bus communication" > "Forced local
mode"
Setting
To enable the function, choose "Enable" with
[OK]. To disable the function, choose "Disable" with
press [OK].
You can temporarily override remote commands from a building
management systems to make local settings. Once you have
"
disabled "Forced local mode , the pump reconnects to the
network when it receives a remote command from the building
management system.
or and press
or and