9.3 Control modes
ALPHA can be set to following control modes:
• Constant curve (zone pump)
• Constant pressure (zone valve )
• Proportional pressure (thermostatic radiator valve)
• Constant flow.
All control modes except constant flow can be set to pump setting I,
II, III or AUTOADAPT.
All control modes in Grundfos GO. Only constant-curve (zone
pump) and constant-pressure (zone valve) control modes can be
set on the operating panel.
9.3.1 Constant curve (zone pump)
In the constant-curve (zone pump) mode, the pump runs at a
constant curve, which means that it runs at constant speed or
power. The pump performance follows the selected constant curve.
This control mode is especially suitable in applications where the
characteristics of the heating system are steady, and the emitters
require a constant flow. The selection of the constant-curve setting
depends on the characteristics of the heating system and the actual
required flow and heat demand.
TM071005
Constant curve
Related information
9.1 Operating panel
10.8 Settings according to system type
9.3.2
Constant curve (zone pump), AUTOADAPT
The constant curve (zone pump) AUTOADAPT setting ensures a
balance between the minimum energy consumption of the pump
and the maximum level of resident comfort.
This setting is designed for zone pump systems where the flow rate
remains stable throughout the year compared to zone valve
systems or systems with TRVs.
TM083658
Pos. Description
1 Minimum curve
2 Maximum curve
When the pump is set to constant curve (zone pump),
AUTOADAPT, the pump starts at a constant curve setting I every
time the pump is turned on. If the zone or room thermostat has not
turned the pump off after an extended operating period, the pump
assumes there is not enough flow and ramps up the speed until it
reaches the maximum performance curve. It maintains this setting
until the pump is switched off by the room or zone thermostat. This
is repeated every time the pump is turned on.
Related information
9.1 Operating panel
14
English (US)
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