Selection Of Control Mode; Setpoint Setting; Automatic Night-Time Duty - Grundfos MAGNA UPE 2000 Series Montage- Und Betriebsanleitung

6.2 Selection of control mode

GRUNDFOS recommends to let the pump remain in
control mode AUTO as, in most cases, this will be
the best setting of the pump.
6.2.1 Guide to the selection of control mode based on system type
System type for instance ...
All types of system
1. Two-pipe
heating sys-
tems with
thermostatic
valves and:
Relatively great
head losses in
the boiler circuit
and the distribu-
tion pipes
2. 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 pipe
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 pri-
mary circuit.

6.2.2 Setpoint setting

The setpoint can be set by pressing
the pump is in control mode:
• proportional pressure,
• constant pressure or
• constant-curve duty.
Set the setpoint so that it matches the system.
A too high setting may result in noise in the system
whereas a too low setting may result in insufficient
heat in some places of the heating system.
If another setting is required and the control mode
and head have not been specified for the system (for
instance, an uncontrolled standard pump is replaced
by a GRUNDFOS MAGNA pump), it is advisable to
use the settings in section 6.2.1.
• with a dimensioned pump head higher than 4 me-
tres,
• 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).
• 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 between
flow pipe and return pipe (e.g. district heating).

6.3 Automatic night-time duty

or when Can be set by means of the control panel or via the
R100, see section 7. Setting the pump.
Once automatic night-time duty has been activated,
the pump will change automatically between normal
duty and night-time duty (min. curve duty). Change-
over between normal duty and night-time duty takes
place as a result of the flow-pipe temperature meas-
ured by an integrated temperature sensor.
The pump automatically changes over to night-time
duty when the temperature sensor registers a flow-
pipe temperature drop of more than 10-15°C within
approx. 2 hours. The temperature drop must be at
least 0.1°C/min.
Changeover to normal duty takes place without a
time lag when the temperature has increased by ap-
prox. 10°C.
select this con-
trol mode ...
AUTO
Proportional
pressure
Constant
pressure
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