English (GB)
12
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
If problems should arise, see section
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
connection with pump replacement
System type
Description
Select this control
mode
1.
Relatively great
head losses in the
boiler circuit and
the distribution
pipes.
a)
Two-pipe
heating
systems with
thermostatic
valves and
with
• a dimensioned pump head higher than
4 metres,
Proportional
pressure
• very long distribution pipes,
• strongly throttled pipe balancing
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.
2.
Relatively small
head losses in the
boiler circuit and
the distribution
pipes.
a)
Two-pipe
heating
systems with
thermostatic
valves and
with
• a dimensioned pump head lower than
2 metres,
Constant pressure
• dimensioned for natural circulation,
• small 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
• 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.
Summary of Contents for UPE 100-120 F
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