13
– Fully open a domestic hot water tap.
– Adjust the maximum air pressure using
fan speed trimmer D (2 fig. 20).
2) Adjust gas pressure
Connect the positive of the manometer
to the gas test point (6 fig. 3).
Sequence (Fig. 20)
– Turn heating output potentiometer to
maximum output.
– Turn the heating power trimmer B to
minimum.
– Adjust the minimum gas pressure using
the OFF-SET (8) on the gas valve.
– Turn the DHW output potentiometer to
maximum output.
– Fully open a domestic hot water tap.
– Adjust the maximum gas pressure using
the gas valve shutter (7).
VERY IMPORTANT:
It’s not necessary to adjust the gas pres-
sure or the fan speed should the boiler be
converted to another gas (ie natural gas to
LPG) only the injector will require changing.
4.6
GAS CONVERSION
A kit complete with instructions for trans-
formation is supplied for G31 propane gas
conversion.
4.7
DISASSEMBLY OF
EXPANSION VESSEL
To disassemble the expansion vessel, pro-
ceed as follows:
– Make sure that the water has been emp-
tied out of the boiler.
– Unscrew the connection and the locknut.
– Remove the expansion vessel.
Before refilling the system, using a pres-
sure gauge attached to the valve make sure
that the expansion vessel is preloaded at a
pressure of 0.8 to 1 bar.
4.8
REMOVAL OF
OUTER CASING
It is possible to completely disassemble the
shell for an easy maintenance of the boiler
as showed in fig. 21.
4.9
CLEANING AND
MAINTENANCE
Preventive maintenance and checking of
efficient operation of equipment and safety
devices must be carried out exclusively by
authorized technical personnel.
4.10
CLEANING THE C.H. WATER FILTER
“AQUA GUARD”
(fig. 22)
To clean the filter, close the flow/return val-
ves, turn off the power to the control panel,
remove the casing and empty the boiler
using the drain provided until the hydrome-
1
2
Fig. 21
7
8
6
2
4
Fig. 20
KEY
2
MAX fan speed trimmer
4
MIN fan speed trimmer
6
Heating power trimmer
7
Shutter
8
OFF-SET
AIR PRESSURE
Minimum
Maximum
(mm H
2
O)
(mm H
2
O)
12.5/13.5
86/88
GAS PRESSURE
Minimum
Maximum
(mm H
2
O)
(mm H
2
O)
10.5/11.5
69/71
Natural gas
LPG
Minimum output
8.7/9.3
9.7/10.3
Maximum output
8.7/9.3
9.7/10.3
– To adjust CO
2
at maximum output adjust
the gas valve OFF-SET.
– To adjust CO
2
at minimum output to ajust
the gas valve shutter.
CO
2
VALUE %
