Grundfos ALPHA+ Montage- Und Betriebsanleitung Seite 96

6.2 Change of head setting
Change the pump head by turning the selector switch on the terminal
box as indicated in the table below:
Setting Result
Factory
Pump performance
setting
according to the heat-
ing demand
(in approx. 90% of all
private houses).
Pump head is
reduced.
Pump head is
increased.
Pump running at mini-
mum performance.
Pump running at me-
dium performance.
Pump running at max-
imum performance.
94
System
Variable-load heating system with
normal resistance, with or without
thermostatic valves.
Variable-load heating system with
low resistance, with or without
thermostatic valves.
Variable-load heating system with
high resistance, with or without
thermostatic valves, or underfloor
heating system.
Also systems fitted with a bypass
valve.
Small constant-load heating sys-
tem.
Setting when adjusting a bypass
valve.
Medium-sized constant-load
heating system.
Large constant-load heating sys-
tem.
Setting when venting the system.