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4. Product description
(mbar)
750
700
650
600
550
500
450
400
350
300
250
200
150
100
50
0
0
0,2
0,4
0,6
0,8
1
1,2
1,4
1,6
1,8
Sequence Sequence displayed Description
x - x
0r
x - x
2
x - x
1
20
4.2.2.
a
b
c
The boiler is fitted with a modulating pump which is regulated by the
2
2,2
2,4
2,6
2,8
3
3,2
3,4
3,6
(m3/h)
control panel as a function of ΔT= (Flow T °C - Return T °C).
M003250-A
The graph shows the manometric height at various outputs. The
parameters MIN.PUMP SPEED and MAX.PUMP SPEED are used to
modify the pump settings. If flow noise can be heard in the system, it
is possible to reduce the maximum pump speed with the parameter
MAX.PUMP SPEED (First of all, vent the heating system). If
circulation in the radiators is too low or the radiators do not fully heat
up, increase the minimum pump speed with the parameter
MIN.PUMP SPEED.
¼See chapter: "Professional settings", page 114.
4.2.3.
The boiler's modulating control system limits the maximum difference
in temperature between the heating flow and return and the maximum
speed at which the flow temperature increases. In this way, the boiler
does not require a minimum water flow rate.
4.2.4.
n Legend
Heating request - Domestic hot water mode
Fan speed
Fuel oil pressure
Solar regulator
21
Solar safety valve
22
Plate heat exchanger
23
Solar collectors
24
Domestic cold water inlet
25
Non-return valve
26
Domestic hot water thermostatic mixing valve
27
DHW pump
28
Circulation pump
Boiler pressure drop (with valve)
a
Boiler pressure drop (without valve)
b
Circulation pump (Class A pump)
c
Water flow
x
Manometric height central heating circuit
y
Water flow rate
Burner operating cycle
AFC 18 - AFC 24 - AFC 30
09/07/2015 - 300026439-07
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