Grundfos TPE2 - 18 Selecting Control Mode

18. Selecting control mode
System application Select this control mode
Recommended for most heating systems, especially in systems with relatively
large pressure losses in the distribution pipes. See the description under
proportional pressure.
In replacement situations where the proportional-pressure duty point is
unknown.
The duty point has to be within the AUTOADAPT operating range. During
operation, the pump automatically adjusts to the actual system characteristic.
This setting ensures minimum energy consumption and low noise level from
valves, which reduces operating costs and increases comfort.
AUTOADAPT
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The FLOWADAPT control mode is a combination of AUTOADAPT and
FLOWLIMIT.
This control mode is suitable for systems where you want a maximum flow
limit, FLOWLIMIT. The pump continuously monitors and adjusts the flow, thus
ensuring that the selected FLOWLIMIT is not exceeded.
Main pumps in boiler applications where a steady flow through the boiler is
required. No extra energy is used for pumping too much liquid into the system.
In systems with mixing loops, you can use the control mode to control the flow
in each loop.
Benefits
• Enough water for all loops at peak load conditions if you have set each
loop to the right maximum flow.
• The dimensioned flow for each zone, required heat energy, is determined
by the flow from the pump.
You can set this value precisely in the FLOWADAPT control mode without
the use of throttling valves.
• When the flow is set lower than the balancing valve setting, the pump
ramps down instead of losing energy by pumping against a balancing
valve.
• Cooling surfaces in air-conditioning systems can operate at high pressure
and low flow.
FLOWADAPT
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In systems with relatively large pressure losses in the distribution pipes and in
air-conditioning and cooling systems.
• Two-pipe heating systems with thermostatic valves and the following:
- very long distribution pipes
- strongly throttled balancing valves
- differential-pressure regulators
- large pressure losses in those parts of the system through which the
total quantity of water flows, for example boiler, heat exchanger and
distribution pipe up to the first branching.
• Primary circuit pumps in systems with large pressure losses in the primary
circuit.
• Air-conditioning systems with the following:
- heat exchangers, fan coils
- cooling ceilings
- cooling surfaces.
Proportional pressure
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Hset
Hset
2
80
English (GB)