Ferroli SIGMA Installation And Servicing Instructions page 23

01 Adjusting the gas pressure and heat output
he ll wing a ustments must be carrie
pers nnel nly.
a ust b iler heat input simply a ust the burner
pressure gas ia the pressure regulat r n the gas al e
( g. 1).
A ust the gas pressure at the burner by turning the pressure
regulating screw: turn it cl ckwise t increase the burner
pressure an anticl ckwise t
he iagrams in icate the
the water as burner w rking pressure is arie
an b).
A usting b iler utput t
the central heating system will minimise b iler cycling
thus sa ing uel arying the
e ect n the e ciency an
the b iler.
ote with LPG (G 1) the pressure regulating screw must be all the way in.
Diagram of pressures and outputs
with
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
4 5 6 7 8 9
ut by uali e
ecrease it.
ariati n in heat
the actual re uirements
utput has
c mbusti n characteristics
atura gas (G 0)
1
10 11 12 13 14 15 16 17 18
kW
ig a
Sigma
utput t
( g. a
irtually n
2
35
30
25
20
15
10
4 5
19 20
1 = Sigma 0- 0
= Sigma 0- 0
Pressure regulator
protection plug
Outlet
pressure
Test Point
Inlet
pressure
Test Point
Inlet
gascock
Diagram of pressures and outputs
with LPG (G31)
1
6 7 8 9 10 11 12 13 14 15 16 17
kW
ig
ig 1
2
18 19 20