11
6.2 Selection of control mode
6.2.1 Setpoint setting
If AUTOADAPT is selected, the setpoint cannot be set.
The setpoint can be set by pressing or when
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 system.
See also section 7.2 Control panel.
6.3 Automatic night-time duty
To be set on the control panel or with the R100, see
section 7. Setting the pump.
Once automatic night-time duty has been activated,
the pump automatically changes between normal
duty and night-time duty (duty at low performance).
Changeover between normal duty and night-time
duty is dependent on the flow-pipe temperature.
The pump automatically changes over to night-time
duty when the built-in sensor registers a flow-pipe
temperature drop of more than 10-15°C within ap-
prox. 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
approx. 10°C.
System type Description
Select this
control mode
Typical systems
Grundfos recommends to let the pump remain in AUTO
ADAPT mode.
This ensures optimum performance at the lowest possible energy con-
sumption.
AUTO
ADAPT
Relatively great
head losses in
the boiler circuit
and the distribu-
tion pipes
1. Two-pipe
heating sys-
tems with
thermostatic
valves and:
• with a dimensioned pump head higher than
4metres,
Proportional
pressure
• 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).
2. Primary circuit pumps in systems with great head losses in the primary
circuit.
Relatively small
head losses in
the boiler circuit
and the distribu-
tion pipe
1. Two-pipe
heating sys-
tems with
thermostatic
valves and:
• with a dimensioned pump head lower than
2metres,
Constant
pressure
• 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).
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.
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