34
INS
TALLER
U
SER
M
AINTEN
AN
CE
TECHNI
CI
AN
TECHNI
CAL
D
AT
A
1.27 CIRCULATION PUMP
The appliance is supplied with built-in pump.
The pump works at a fixed speed both in central heating and in
DHW.
Pump LED.
When the pump is powered, the LED lights up with a steady green
light.
When the pump is switched on, the green LED flashes at
higher intensity and then returns to normal intensity
with a steady green light.
If the pump detects an alarm, the LED switches from green to red;
this can mean one of the following failures:
- low supply voltage;
- rotor seized;
- electrical error.
For a detailed description of the meaning of the red LED, refer to
The LED, in addition to being green or red, can also re-
main off.
It is normal for the LED to be off when the pump is not
powered, whereas with the pump powered, the LED
must be lit: if switched off, it means there is a fault.
Pump release.
If after a long period of inactivity, the circulator is blocked, adjust
the screw in the centre of the head in order to manually release the
motor shaft.
Take great care during this operation to avoid damage to the mo-
tor.
Bypass Adjustment (Parag. 1.29).
The boiler leaves the factory with the bypass open.
If necessary, the by-pass can be regulated to system requirements
from minimum (by-pass closed) to maximum (by-pass open).
Adjust using a flat head screwdriver, turn clockwise and open the
by-pass, anticlockwise it is closed.
The by-pass ensures minimum circulation of the water
in the boiler and correct operation of the appliance if the
systems are divided into more than one zone.
Total head available to the system.
H
ea
d (
kPa
)
0,0
5,0
10,0
15,0
20,0
25,0
30,0
35,0
40,0
45,0
50,0
55,0
60,0
0
100
200
300
400
500
600
700
800
900
1000
1100
1200
1300
0,0
5,0
10,0
15,0
20,0
25,0
30,0
35,0
40,0
45,0
50,0
55,0
60,0
A
B
C
D
Ci
rc
ul
at
or
pu
m
p a
bs
or
be
d p
ow
er
(W
)
Flow rate (l/h)
34
Key (Fig. 34):
A
= Head available with by-pass excluded
B
= Head available with by-pass engaged
C
= Power absorbed by the pump with bypass engaged (dotted area)
D
= Power absorbed by the pump with by-pass excluded (dotted area)
