21
Solar regulator
22
Solar safety valve
23
Plate heat exchanger
24
Solar collectors
25
Domestic cold water inlet
26
Non-return valve
27
Domestic hot water thermostatic mixing valve
28
DHW pump
4.2.2.
Circulation pump
a
Boiler pressure drop (with valve)
b
Boiler pressure drop (without valve)
c
Circulation pump (Class A pump)
x
Water flow
y
Manometric height central heating circuit
The boiler is fitted with a modulating pump which is regulated by the
control panel as a function of ΔT= (Flow T °C - Return T °C).
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
.
¼
See chapter: "Professional settings", page 114.
4.2.3.
Water flow rate
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.
Burner operating cycle
n
Legend
Sequence Sequence displayed Description
0
r
x - x
Heating request - Domestic hot water mode
2
x - x
Fan speed
1
x - x
Fuel oil pressure
M003250-A
(mbar)
(m3/h)
0
50
100
150
200
250
300
350
400
450
500
550
600
650
700
750
0
0,2
0,4
0,6
0,8
1
1,2
1,4
1,6
1,8
2
2,2
2,4
2,6
2,8
3
3,2
3,4
3,6
a
b
c
4. Product description
AFC 18 - AFC 24 - AFC 30
20
09/07/2015 - 300026439-07