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SUN G20 1S
3. SERVICE AND MAINTENANCE
All the adjustment, commissioning and maintenance operations must be performed by Qualified Per-
sonnel, in compliance with the standards in force. The local sales organisation and Customer Service
Centre is available for any further information.
FERROLI S.p.A. declines all liability for damage to persons and/or things deriving from tampering with
the appliance by non-authorised persons
3.1 Settings
Head and air damper adjustment
The adjustment of the head depends on the flow-rate of the
burner. The head is adjusted by rotating the adjustment screws
"B" clockwise or anticlockwise until the notch on rod "A" is
n line with the reference.
This modifies the position of the baffle in respect to the drau-
ght tube, and as a consequence the flow of air.
To adjust the air flow-rate, use screw "C" after loosening
nut "D".
At the end of adjustment tighten nut "D".
To limit the amount of dispersion from the stack when
the boiler is off, the burner is fitted with a gravity-
closing air damper that closes automatically when the
burner stops.
To perform a preliminary adjustment of head and air damper during installation (before commissioning
and consequently calibrating the appliance using instruments), use the table below:
Model
GN2 N 06
GN2 N 07
GN2 N 08
GN2 N 09
GN2 N 10
GN2 N 11
GN2 N 12
Prextherm N 107
Prextherm N 145
Prextherm N 180
Prextherm RSW 152
Prextherm RSW 190
Adjusting pump pressure
The pressure of the pump is factory-set to 12 bars, for optimum operation, and normally should not be
modified. Nonetheless, if under specific circumstances a different pressure needs to be set, once having
attached the pressure gauge and ignited the burner, use the adjustment screws "6" indicated in fig. 4.
In any case, it is recommended to keep within the range 10 - 14 bars.
28
Heat output
Max
Min
kW
kW
116
95
Danfoss 2.50 60° S
137
110
Danfoss 3.00 60° S
157
125
Danfoss 3.50 60° S
176
140
Danfoss 3.50 60° S
196
155
Danfoss 4.50 60° S
215
170
Danfoss 4.50 60° S
235
185
Danfoss 4.50 60° S
116
75
Danfoss 2.50 60° S
158
102
Danfoss 3.50 60° S
196
140
Danfoss 4.50 60° S
165
107.3
Danfoss 3.50 60° S
205.5
147.4
Danfoss 4.50 60° S
Cod. 3540G302 - Rev. 01 - 02/2015
Pump
Nozzle
pressure
bar
10
12
10.5
14
10
12
14
10
10.6
10
12
11
fig. 7
Air
Head
Notch
L (mm)
Notch
5
63
26
7
63
26
7
57
20
8
52
15
10
49
13
10
45
9
12
44
8
6
63
26
7
46
10
11
45
9
9
46
10
12
44.4
8.5
fig. 8 - Table
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