Selection Of Control Mode - Grundfos UPED 80-120 FZ Montageanleitung Und Bedienungsanleitung

7.3 Selection of control mode

Systems with specified control mode
If the pump control mode (proportional or constant
pressure) and head have been specified for the
system in which the pump is to be installed, set the
pump as specified. See section 8. Setting the pump.
If problems should arise, see section 9. Fault finding.
System type
1. Relatively great
head losses in the
boiler circuit and
the distribution
pipes.
2. Relatively small
head losses in the
boiler circuit and
the distribution
pipes.
Description
a) Two-pipe • a dimensioned pump head higher than
heating 4 metres,
systems with
• very long distribution pipes,
thermostatic
valves and • strongly throttled pipe balancing
with valves,
• differential pressure regulators,
• great head losses in those parts of the
system through with the total quantity
of water flows (for example boiler,
heat exchanger and distribution pipe
up to the first branching) or
• low differential temperature.
b) Underfloor heating systems and one-pipe heating
systems with thermostatic valves and great head losses
in the boiler circuit.
c) Primary circuit pumps in systems with great head
losses in the primary circuit.
a) Two-pipe • a dimensioned pump head lower than
heating 2 metres,
systems with
• dimensioned for natural circulation,
thermostatic
valves and • small head losses in those parts of the
with system through with the total quantity
of water flows (for example boiler,
heat exchanger and distribution pipe
up to the first branching) or
• modified to a high differential
temperature (for example district
heating).
b) Underfloor heating systems with thermostatic valves.
c) One-pipe heating systems with thermostatic valves or
pipe balancing valves.
d) Primary circuit pumps in systems with small head
losses in the primary circuit.
Systems with no specified control mode
If the pump control mode and head have not been
specified for the system (for instance, an
uncontrolled standard pump is replaced by the
UPE pump), it is advisable to use the settings in the
table below and in section 7.3.1 Setting in
connection with pump replacement.
Select this control
mode
Proportional
pressure
Constant pressure
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