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GENERAL
ADJUSTING THE PUMP
The boiler's pump is ErP 2015 Ready, and suitable for
use in central heating only/domestic hot water applica-
tions. The pump can be controlled by an external PWM
signal and has 4 different pressure curves for central
heating applications.
When controlled by a PWM signal, pump speed varies
according to the frequency of the incoming PWM signal,
modulating head/flow rate on the basis of the selected
curve.
In the absence of a PWM signal, the pump runs at full
speed and delivers the head/flow rate determined by
the selected curve. Each curve is characterised by a ma-
ximum head expressed in metres.
User interface
The user interface features one button (1), one red/gre-
en LED (2) and four yellow LEDs.
Via this interface, users can access:
Functioning (performance display) mode. Pump per-
formance is displayed during functioning as a % of cur-
rent draw with respect to rated load. Alarm conditions
can be seen from the colour of LED (2).
Setting mode. Setting mode is accessed by pressing the
button (1), and is used to select the pump curve.
BUTTON (1)
LED (2)
Display
LED 1 flashing green
LED 1 green and LED 2
yellow, both lit
LED 1 green and LEDs 2,
3 yellow, all lit
LED 1 green, LEDs 2, 3, 4
yellow, all lit
LED 1 green, LEDs 2, 3,
4, 5 yellow, all lit
PUMP LOAD CURVE
50 %
25 %
Functioning mode
A) Performance display
When the pump is functioning, LED 1 is green. The four
yellow LEDs indicate the instantaneous power draw as
shown in the table above. In functioning mode, all ac-
tive LEDs are lit (not flashing) to differentiate this con-
dition from setting mode. If the pump is stopped by the
external control signal, LED 1 flashes green.
B) Alarm display
If the pump detects one or more alarm conditions, LED
1 changes from green to red. When an alarm is active,
the LEDs indicate the type of alarm as shown in the fol-
lowing table. If more than one alarm is active at the
same time, the LEDs only show the alarm condition with
the highest priority. Alarm priority follows the order of
the table .
When no alarm is active, the user interface automati-
cally displays pump performance.
14
Meaning
% power
Stand-by (only
0
with PWM con-
trol)
Low load
0-25
Low-medium
25-50
load
Medium-high
50-75
load
High load
75-100
100 %
75 %
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