Selection Of Control Mode - Grundfos UPE Series 2000 Montage- Und Betriebsanleitung

6.2 Selection of control mode

Systems with specified control mode:
If the control mode (proportional or constant pres-
sure) and the pump head have been specified for the
system in which the pump is to be installed, the
pump should be set as specified. See section 7. Set-
ting the pump. If problems should arise, see section
8. Fault finding chart.
In systems
for instance
with
1. Two-pipe
heating sys-
tems with
thermostatic
valves and
with:
relatively great
head losses in
the boiler circuit
and the distribu-
tion pipes
2. Underfloor heating systems and one-pipe heating systems with ther-
mostatic valves and great head losses in the boiler circuit.
3. Primary circuit pumps in systems with great head losses in the primary
circuit.
1. Two-pipe
heating sys-
tems with
thermostatic
valves and:
relatively small
head losses in
the boiler circuit
and the distribu-
tion pipes
2. Underfloor heating systems with thermostatic valves.
3. One-pipe heating systems with thermostatic valves or pipe balancing
valves.
4. Primary circuit pumps in systems with small head losses in the primary
circuit.
Systems with no specified control mode:
If the control mode and the pump head have not
been specified for the system (for instance, an un-
controlled standard pump is replaced by the UPE
pump), it is advisable to use the settings in the fol-
lowing table and in section 6.2.1 Settings in connec-
tion with pump replacement.
• a dimensioned pump head higher than 4 metres,
• very long distribution pipes,
• strongly throttled pipe balancing valves,
• differential pressure regulators,
• great head losses in those parts of the system
through which the total quantity of water flows (e.g.
boiler, heat exchanger and distribution pipe up to
the first branching) or
• low differential temperature.
• with a dimensioned pump head lower than 2 me-
tres,
• dimensioned for natural circulation,
• with small head losses in those parts of the system
through which the total quantity of water flows (e.g.
boiler, heat exchanger and distribution pipe up to
the first branching) or
• modified to a high differential temperature (e.g. dis-
trict heating).
select this con-
trol mode:
Proportional
pressure
Constant
pressure
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