Installation Manual
Floor standing storage boiler – Cod. 99949NA – November 2002
14
REGULATING THE GAS PRESSURE
Maximum and minimum modulation pressures
.
N.B.
The following operations must only be carried
out by authorised personnel and are necessary when
the boiler is converted to run on one type of gas or
another or also in cases where the maximum
pressure is not the same as that shown on the plate.
Calibration pressure.
BOILER POWER
RATING
Natural Gas
L.P.G..
Min. Max. Min. Max.
Room sealed
combustion
chamber model
mbar
4.2 13 5
31
KEY
: (see fig. A)
1) Modulating coil
2) Fastening clips
3) Min. gas pressure adjustment screw
4) Max gas pressure adjustment core
5) Core lock nut
6) Calibrator spring
7) Modulator core
8) Gas valve stabiliser
Fig. B)
Widen locking clips (2);
Fig. C)
Slide out the coil (1) located above the gas
valve;
Fig. D)
Tighten plastic screw (3) by turning it
clockwise, be careful not to break it.
Fig. E)
Use a no.17 spanner to undo the lock nut (5)
which holds the core (4) of the coil in place; undo the
screw and insert a pressure gauge;
Fig. F)
Turn on the boiler, regulate the maximum
pressure by turning the core (4) (clockwise to
increase pressure, counter clockwise to decrease).
Once maximum pressure has been set, tighten the
lock nut (5);
Fig. G)
Adjust minimum modulation pressure with the
coil disengaged: slowly unscrew plastic screw (3)
until the pressure gauge shows the minimum
pressure required.
Fig. H)
Once these operations are completed, seal
the plastic screw with paint or enamel; reassemble
the coil (1) by pressing it back into place; remove the
gauge, tighten the screw and use a soapy solution to
check for any eventual l leaks.
10
9
1
1
4
5
4
3
1
5
4
2
7
4
8
6
4
1
5
4
2
3
1
Fig. A
Fig. B
Fig. C
Fig. D
Fig. E
Fig. F
Fig. G
Fig. H
