Installation Manual
Combi - cod. 99943NA – November 2002
13
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.
20.000 kcal/h
mmbar
2 11 5 29
24.000 kcal/h
mmbar
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
Содержание RSF 24 E
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