Inova NH 20/40 Betriebsanleitung Seite 29

English
6.2 Functions
All functions can be set, activated or deactivated using the
operating knob.
In operating mode, the current power consumption in W is dis-
played.
When the knob is turned, the LED display shows the delivery
head in m.
Control mode:
Variable differential pressure (Δp-v):
The differential-pressure setpoint H is increased linearly over
the permitted volume flow range between ½H and H (Fig. 2a).
The differential pressure generated by the pump is adjusted to
the corresponding differential-pressure setpoint. This control
mode is especially useful in heating systems with radiators,
since the flow noises at the thermostatic valves are reduced.
Constant differential pressure (Δp-c):
The differential-pressure setpoint H is kept constant over the
permitted volume flow range at the set differential-pressure
setpoint up to the maximum pump curve (Fig. 2b). Speck rec-
ommends this control mode for underfloor-heating circuits or
older heating systems with large-sized pipes as well as for all
applications with no changeable pipe system curve, e.g. boiler
charge pumps.
Venting function:
The venting function lasts 10 minutes after activation. After 10
minutes, the pump stops and goes into a wait mode which is
indicated by the middle bar of the LED display flashing.
After the venting process, the desired control mode and the
delivery head on the pump must be selected and set in order
to put the pump into operation.
Installation and operating instructions INOVA NH 25